Engineering Structures最新文献

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Uniaxial behaviour of biomass bamboo coarse aggregates concrete-filled steel tube columns with different cross-section shapes 不同截面形状生物质竹粗骨料钢管混凝土柱的单轴性能
IF 6.4 1区 工程技术
Engineering Structures Pub Date : 2025-10-03 DOI: 10.1016/j.engstruct.2025.121469
Gaofei Wang , Yang Wei , Jingshuo Xu , Binrong Zhu , Yu Lin , Manqi Hua
{"title":"Uniaxial behaviour of biomass bamboo coarse aggregates concrete-filled steel tube columns with different cross-section shapes","authors":"Gaofei Wang ,&nbsp;Yang Wei ,&nbsp;Jingshuo Xu ,&nbsp;Binrong Zhu ,&nbsp;Yu Lin ,&nbsp;Manqi Hua","doi":"10.1016/j.engstruct.2025.121469","DOIUrl":"10.1016/j.engstruct.2025.121469","url":null,"abstract":"<div><div>This study proposes combining bamboo aggregate concrete (BAC) with concrete-filled steel tube columns (CFSTs), leveraging bamboo's resource advantages while compensating for its lower strength and durability through steel tube confinement to achieve resource recycling and emission reduction goals. Monotonic axial compression tests were conducted on 38 CFSTs. Key parameters included the bamboo coarse aggregate replacement rate (<em>r</em>), cross-sectional shapes, and steel ratios (<em>α</em>). The research revealed that the steel tube's confinement effect on BAC substantially improves both its load-bearing capacity and ductility. Circular specimens primarily exhibited waist drum-shaped failure, whereas square specimens were dominated by shear slip failure. Under different confinement coefficients, the axial load-strain curves can be categorized into medium and strong confinement. The strength index (<em>SI</em>) of all specimens exceeded 1, demonstrating a \"1 + 1 &gt; 2\" effect. Peak stress (<em>f</em><sub>cc</sub>) and <em>SI</em> showed positive correlations with <em>α</em>. When the steel tube parameters were consistent, an increase in <em>r</em> led to a reduction in the <em>f</em><sub>cc</sub> of BACFSTs but significantly improved their ductility index, with the maximum increase reaching 70.9 %. For core concrete with <em>r</em> = 0 % and 25 %, <em>α</em>≥ 0.170 is preliminarily recommended; for core concrete with <em>r</em> = 45 %, <em>α</em>≥ 0.130 is initially advised. Finite element simulations were conducted based on the modified uniaxial stress-strain model of core BAC. The simulations reproduced the failure modes and response curves consistent with the test, and the contributions of the steel tube and the concrete to the load-bearing capacity were analyzed separately. Finally, through regression analysis of test data, a model capable of predicting the axial bearing capacity of circular BACFSTs was proposed.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"345 ","pages":"Article 121469"},"PeriodicalIF":6.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on temperature distribution characteristics of steel-shell concrete tower in double-deck steel truss suspension bridge under tanker fire 罐车火灾下双层钢桁架悬索桥钢壳混凝土塔温度分布特性研究
IF 6.4 1区 工程技术
Engineering Structures Pub Date : 2025-10-03 DOI: 10.1016/j.engstruct.2025.121500
Guoming Yang, Jianing Zhao, Xiuli Xu, Zhijun Li, Xuehong Li
{"title":"Study on temperature distribution characteristics of steel-shell concrete tower in double-deck steel truss suspension bridge under tanker fire","authors":"Guoming Yang,&nbsp;Jianing Zhao,&nbsp;Xiuli Xu,&nbsp;Zhijun Li,&nbsp;Xuehong Li","doi":"10.1016/j.engstruct.2025.121500","DOIUrl":"10.1016/j.engstruct.2025.121500","url":null,"abstract":"<div><div>Steel-shell concrete bridge towers are widely used in long-span bridges due to their excellent mechanical performance and construction efficiency. However, studies on their temperature distribution and heat transfer behavior under extreme fire conditions remain limited. This paper investigates the thermal response characteristics of a steel-shell concrete tower on a double-deck truss-stiffened suspension bridge using a coupled Computational Fluid Dynamics (CFD) and Finite Element Method (FEM) approach, considering tanker fire scenarios on both upper and lower decks. The results indicate that wind speed significantly affects flame shape and wall temperature distribution, with the area of high-temperature zones and peak air temperatures initially increasing and then decreasing as wind speed rises. The longitudinal position of the fire source along the bridge also has a notable impact on thermal effects. A comprehensive evaluation method is proposed, incorporating wall air temperature and high-temperature zone area, to identify the most unfavorable fire scenarios. The findings show that upper-deck fires pose a greater risk to the tower than lower-deck fires. Under the most severe upper-deck fire condition, the maximum temperature of the steel shell reaches 972 °C, while the peak temperature of the concrete is around 650 °C, decreasing approximately linearly with depth to below 50 °C at 200 mm. The steel shell and ribs exhibit rapid heat transfer, forming distinct temperature gradients, while the internal concrete shows delayed temperature rise, demonstrating good thermal inertia. These findings clearly reveal the heat transfer characteristics of steel-shell concrete towers under fire exposure and provide valuable reference for fire-resistant design and safety assessment of similar structures.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"345 ","pages":"Article 121500"},"PeriodicalIF":6.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
3D laser scanning and DIC in structural testing: state‐of‐the‐art, best practice and effective use 结构测试中的3D激光扫描和DIC:最新技术、最佳实践和有效使用
IF 6.4 1区 工程技术
Engineering Structures Pub Date : 2025-10-03 DOI: 10.1016/j.engstruct.2025.121055
Xin Meng , Andy Pullen , Xi Guo , Xiang Yun , Leroy Gardner
{"title":"3D laser scanning and DIC in structural testing: state‐of‐the‐art, best practice and effective use","authors":"Xin Meng ,&nbsp;Andy Pullen ,&nbsp;Xi Guo ,&nbsp;Xiang Yun ,&nbsp;Leroy Gardner","doi":"10.1016/j.engstruct.2025.121055","DOIUrl":"10.1016/j.engstruct.2025.121055","url":null,"abstract":"<div><div>3D laser scanning and digital image correlation (DIC), two novel techniques capable of non-contact, full-field measurements of surface geometry and deformations respectively, have emerged and gained increasing applications in structural engineering research. The aim of the present study is to provide a state-of-the-art review and best-practice guidance on 3D laser scanning and DIC in the context of structural testing, and to introduce their main applications and advantages in physical experiments on metallic structures. For 3D laser scanning, the basic principles and general applications are firstly introduced. Laser scanning of a generic structural steel sample is subsequently described as a case study to demonstrate the workflow, with recommendations provided on the best practice. 3D laser scanning has been utilised in structural experiments for determining dimensional parameters, examining surface topography, characterising geometric imperfections of different forms and representing true geometry in finite element modelling, examples of which, along with corresponding data analysis methods, are provided and discussed. For DIC, following an initial review, the procedure for setting up a stereo DIC system in a stub column test is subsequently presented, where recommendations are provided on the setup, speckle pattern, execution and data processing. Example applications of DIC in various types of structural experiments, ranging from material tests to geometric imperfection measurements, structural element tests and structural system tests, are subsequently presented, and the advantages offered by DIC over conventional measurement methods are discussed. 3D laser scanning and DIC provide structural researchers with deeper insights into the geometric properties and behaviour of metallic structures in physical experiments, and the presented work will help to facilitate the broader and more effective use of these techniques among peer researchers.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"345 ","pages":"Article 121055"},"PeriodicalIF":6.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
3D-printed multi-functional sinusoidal metamaterials for simultaneous vibration isolation and electricity generation 用于同时隔振和发电的3d打印多功能正弦超材料
IF 6.4 1区 工程技术
Engineering Structures Pub Date : 2025-10-03 DOI: 10.1016/j.engstruct.2025.121496
Ramin Hamzehei , Mahdi Alaei Varnosfaderani , Mahdi Bodaghi , Nan Wu
{"title":"3D-printed multi-functional sinusoidal metamaterials for simultaneous vibration isolation and electricity generation","authors":"Ramin Hamzehei ,&nbsp;Mahdi Alaei Varnosfaderani ,&nbsp;Mahdi Bodaghi ,&nbsp;Nan Wu","doi":"10.1016/j.engstruct.2025.121496","DOIUrl":"10.1016/j.engstruct.2025.121496","url":null,"abstract":"<div><div>This study introduces 3D-printed multi-functional sinusoidal metamaterials designed for simultaneous vibration isolation and electricity generation. The innovative design follows the sinusoidal patterns derived from re-engineered common auxetic re-entrant unit cells, resulting in multi-stiffness lattice structures. Layers of unit cells, with one rotated 90°, are integrated, facilitating local buckling in the vertical beams under compression. A quasi-zero-stiffness (QZS) mechanism, achieved through local buckling-induced nonlinearity, is incorporated to enhance vibration isolation. Two stabilizers are designed to maintain global structural stability under compression and dynamic loads, and the underlying deformation mechanisms are elucidated by finite element analysis (FEA) and experiments. Experimental evaluation reveals effective vibration isolation for frequencies above 15 Hz. For electricity generation, two piezoelectric materials are employed, namely Lead zirconate titanate (PZT) and piezo bender (PB). The flexible lattice structure, made from thermoplastic polyurethane (TPU), can withstand substantial bending deformations under a specific load and simultaneously apply bending forces to the PB. This leads to electricity generation at approximately 3 volts (V) and maximum generated power around 700 microwatts per gravity (<span><math><mfrac><mrow><mi>μ</mi><mi>W</mi></mrow><mrow><mi>g</mi></mrow></mfrac></math></span>) by one PB at a low frequency of 15 Hz, where vibration isolation arises. Meanwhile, one PZT, mounted on a polylactic acid (PLA)-based semi-honeycomb structure, generates energy due to higher dynamic forces caused by high-stiffness property of PLA, leading to electricity generation at around 500 millivolts (mV), and a maximum generated power of 800 <span><math><mfrac><mrow><mi>μ</mi><mi>W</mi></mrow><mrow><mi>g</mi></mrow></mfrac></math></span> at a high frequency of 90 Hz. The proposed metamaterials exhibit material-independent properties with multi-functional potentials for simultaneous vibration isolation and electricity generation. They support wearable applications, enabling motion tracking and injury prevention in protective gear through self-powered sensing. In civil structures, these hybrid metamaterials can be embedded in bridge joints, isolation pads, or foundations to reduce low-frequency vibrations and power wireless sensors for real-time, self-sustained structural health monitoring.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"345 ","pages":"Article 121496"},"PeriodicalIF":6.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Negative flexural performance of steel-UHPC composite deck with a novel grouped stud configuration addressing the shrinkage influence 采用新型组合螺柱结构的钢- uhpc复合桥面负弯曲性能,解决了收缩影响
IF 6.4 1区 工程技术
Engineering Structures Pub Date : 2025-10-03 DOI: 10.1016/j.engstruct.2025.121474
Sheraz Abbas , Han Xiao , Chen Xu , Wei Wang , Biao Ma
{"title":"Negative flexural performance of steel-UHPC composite deck with a novel grouped stud configuration addressing the shrinkage influence","authors":"Sheraz Abbas ,&nbsp;Han Xiao ,&nbsp;Chen Xu ,&nbsp;Wei Wang ,&nbsp;Biao Ma","doi":"10.1016/j.engstruct.2025.121474","DOIUrl":"10.1016/j.engstruct.2025.121474","url":null,"abstract":"<div><div>The shrinkage effect in steel-Ultra High Performance Concrete (UHPC) composite decks can lead to damage accumulation, potentially compromising the flexural performance and structural integrity of the composite system. A newly developed group stud configuration that is effective in reducing the early shrinkage-induced stress in steel-UHPC composite decks. A further study on the negative flexural performance of steel-UHPC composite deck with group stud configuration was conducted to reveal its mechanical performance and reliability. Two full-scale bridge deck segment specimens, with Conventional Uniform studs (SU) and Novel Grouped studs (SG) configurations, were investigated through static load tests under negative bending to evaluate the negative flexural performance. Additionally, simulations and parametric analysis were carried out to assess the impact of varying group stud spacing on flexural performance. The results indicate that the grouped stud arrangement not only reduces shrinkage-induced stresses but also improves crack control, while maintaining bending stiffness and ultimate load capacity comparable to the conventional unifrom stud arrrangment. Additionally, reinforcement yielding occurred at crack widths beyond 1.0 mm, highlighting the potential of the grouped stud configuration to improve serviceability and long-term durability in steel–UHPC composite decks. Similarly, Finite Element (FE) simulations successfully captured the stress distribution induced by shrinkage and the corresponding load-displacement behaviour. Parametric analysis revealed that shrinkage-induced stresses reduced the load capacity by 10 % in the uniform stud arrangement, whereas this effect was negligible in the grouped stud configuration. This study confirms that a grouped stud configuration mitigates shrinkage-induced stresses while maintaining comparable mechanical performance, providing important implications for the design of steel-UHPC composite bridge decks.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"345 ","pages":"Article 121474"},"PeriodicalIF":6.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Seismic mitigation and configuration-based performance study on particle tuned mass damper applied to transmission tower-line system 基于构型的质点调谐质量阻尼器在输电塔线系统中的抗震性能研究
IF 6.4 1区 工程技术
Engineering Structures Pub Date : 2025-10-03 DOI: 10.1016/j.engstruct.2025.121490
Kunjie Rong , Junrong Gong , Zheng Lu , Li Tian , Yelei Shen , Mengyao Zhou
{"title":"Seismic mitigation and configuration-based performance study on particle tuned mass damper applied to transmission tower-line system","authors":"Kunjie Rong ,&nbsp;Junrong Gong ,&nbsp;Zheng Lu ,&nbsp;Li Tian ,&nbsp;Yelei Shen ,&nbsp;Mengyao Zhou","doi":"10.1016/j.engstruct.2025.121490","DOIUrl":"10.1016/j.engstruct.2025.121490","url":null,"abstract":"<div><div>This study develops a finite-discrete element coupling simulation model to assess seismic mitigation effectiveness of particle tuned mass dampers (PTMDs) in transmission tower-line systems (TTLSs). The particle dynamics within the PTMD are investigated, and parametric analyses are conducted to explore the vibration control mechanism. A key indicator, the average pounding clearance, is proposed to reflect the influence of PTMD configuration on its damping performance. Results show that the simulation model, validated through shaking table tests, effectively captures the nonlinear vibration characteristics of both the TTLS and the PTMD. PTMD significantly reduces the seismic response of transmission towers in TTLS, achieving a maximum reduction ratio of 45.6 %. The pounding of particles within the PTMD can transfer vibration energy to higher frequencies, expediting energy dissipation. Furthermore, upper and lower numerical bounds can be found for particle displacement in a single-particle PTMD. However, these bounds are less strict for multiple-particle PTMDs, highlighting the limitation of the simplification method used in previous studies. The proposed indicator addresses the limitations of traditional parameters, such as area filling ratio, which fail to independently capture the impact of PTMD configuration on its damping performance.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"345 ","pages":"Article 121490"},"PeriodicalIF":6.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Predicting local buckling in steel members under cyclic loads: A strain-based approach using the CSM 循环荷载作用下钢构件局部屈曲预测:基于应变的CSM方法
IF 6.4 1区 工程技术
Engineering Structures Pub Date : 2025-10-02 DOI: 10.1016/j.engstruct.2025.121473
Yu Chen , Christian Málaga-Chuquitaype , Feng Zhou , Leroy Gardner
{"title":"Predicting local buckling in steel members under cyclic loads: A strain-based approach using the CSM","authors":"Yu Chen ,&nbsp;Christian Málaga-Chuquitaype ,&nbsp;Feng Zhou ,&nbsp;Leroy Gardner","doi":"10.1016/j.engstruct.2025.121473","DOIUrl":"10.1016/j.engstruct.2025.121473","url":null,"abstract":"<div><div>A new approach, based on the Continuous Strength Method (CSM), is presented for the prediction of cross-section failure through inelastic local buckling in steel members under cyclic loading. Cross-section local buckling failure is predicted to occur when a prescribed strain limit is reached; the effect of loading history is accounted for by considering the cumulative strain from each loading cycle. The strain limit is related to the cross-section slenderness, which is based on the local buckling behaviour of the full cross-section, rather than the individual plate width-to-thickness ratios, making it suitable for different section profiles (e.g., hollow sections and I-sections). Finite element models are established, validated and used to conduct parametric studies, covering a series of steel grades, a wide range of cross-section slendernesses and various cyclic axial loading protocols. The resulting numerical data sets are employed to develop a means of rationally considering the contribution of both the compressive and tensile strain ranges in each loading cycle to cross-section failure. The suitability of the newly proposed method is verified against experimental results on beam-columns with hollow sections and I-sections under cyclic loading, as well as numerical results. The findings indicate that the cumulative deformation capacity and local buckling failure of steel cross-sections can be accurately predicted using the developed strain-based design method. The method can be applied in the inelastic analysis of structures under seismic loading and in the seismic design of steel cross-sections.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"345 ","pages":"Article 121473"},"PeriodicalIF":6.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploration of Multi-Fidelity Co-Kriging and Real-Time Hybrid Simulation for Time-Dependent Seismic Performance Evaluation 基于多保真度协同克里格和实时混合仿真的时变地震性能评价研究
IF 6.4 1区 工程技术
Engineering Structures Pub Date : 2025-10-02 DOI: 10.1016/j.engstruct.2025.121497
Guangquan Yu , Weijie Xu , Changle Peng , Cheng Chen , Tong Guo
{"title":"Exploration of Multi-Fidelity Co-Kriging and Real-Time Hybrid Simulation for Time-Dependent Seismic Performance Evaluation","authors":"Guangquan Yu ,&nbsp;Weijie Xu ,&nbsp;Changle Peng ,&nbsp;Cheng Chen ,&nbsp;Tong Guo","doi":"10.1016/j.engstruct.2025.121497","DOIUrl":"10.1016/j.engstruct.2025.121497","url":null,"abstract":"<div><div>Real-time hybrid simulation (RTHS) divides the structure under investigation into experimental and numerical substructures thus facilitates large- or even full-scale experiments beyond laboratory constraints. Traditional analysis of time-varying uncertainties necessitates extensive RTHS experiments in laboratories when parts of structures are difficult for accurate modeling due to their complexity and/or nonlinearity. To address this challenge, this study explores Co-Kriging meta-modeling and adaptive sampling with RTHS aiming for efficient time-dependent performance evaluation with limited number of RTHS tests in laboratories. The expansion optimal linear estimation method is applied to discretize random processes for time-varying uncertainties. Key informative sample points are selected through an adaptive sampling technique, while the Co-Kriging meta-model combines low-fidelity numerical simulations with high-fidelity RTHS experiments to account for time-varying uncertainties in structural response prediction. A single-degree-of-freedom structure with time-varying stiffness degradation is used in this pilot study to experimentally evaluate the accuracy and efficiency of proposed multi-fidelity approach. It is demonstrated that the Co-Kriging meta-modeling provides a promising alternative for efficient time-dependent performance evaluation to account for time-varying uncertainties especially when parts of structure are difficult for numerical modeling. Compared with single fidelity based method such as Kriging, Co-Kriging provides faster convergence thus leading to less laboratory tests.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"345 ","pages":"Article 121497"},"PeriodicalIF":6.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fire performance and post-fire residual behavior of insulated CFRP shear-strengthened RC beams: An experimental and numerical study 绝缘CFRP剪力增强RC梁的火灾性能和火灾后残余性能:试验和数值研究
IF 6.4 1区 工程技术
Engineering Structures Pub Date : 2025-10-02 DOI: 10.1016/j.engstruct.2025.121480
Wan-Yang Gao , Jun-Cong Lin , Ke-Xu Hu , Jian Yang
{"title":"Fire performance and post-fire residual behavior of insulated CFRP shear-strengthened RC beams: An experimental and numerical study","authors":"Wan-Yang Gao ,&nbsp;Jun-Cong Lin ,&nbsp;Ke-Xu Hu ,&nbsp;Jian Yang","doi":"10.1016/j.engstruct.2025.121480","DOIUrl":"10.1016/j.engstruct.2025.121480","url":null,"abstract":"<div><div>This paper presents an experimental and numerical study on the fire performance and post-fire residual behavior of reinforced concrete (RC) beams shear-strengthened with carbon fiber-reinforced polymer (CFRP) U-wraps. Seven full-scale beams were tested, including three specimens under ambient conditions and four subjected to ISO 834 standard fire exposure. The key experimental variables included fire exposure duration, number of CFRP U-wrap layers, shear span-to-depth ratio and the presence of a 20 mm fire-resistant mortar insulation layer. Experimental results showed that the CFRP U-wraps increased the shear capacity of the specimens by approximately 30 %–35 % under ambient conditions. In fire tests, the uninsulated RC beam failed due to diagonal shear cracking, whereas the insulated CFRP shear-strengthened RC beams maintained their structural integrity for a fire resistance rating of 2.5 h, exhibiting only small midspan deflections. Subsequent post-fire bending tests showed that the insulation layer effectively preserved the residual shear capacity of the strengthened beams, maintaining values comparable to their pre-fire capacities. A coupled thermal-mechanical numerical model was proposed by integrating transient heat transfer analysis with a fiber-based sectional method to predict the temperature distribution within the beam cross-section and to quantify the degradation of shear capacity during and after fire exposure. The model explicitly accounted for the temperature-dependent deterioration of concrete, steel stirrups and CFRP U-wraps as well as the bond behavior between the CFRP and the concrete substrate. Numerical predictions showed close agreement with the experimental results, which validated the accuracy and reliability of the proposed numerical model. The validated model offers a robust analytical framework for evaluating the in-fire and post-fire shear performance of CFRP shear-strengthened RC beams, thereby supporting the development of performance-based fire-resistance design provisions for such members.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"345 ","pages":"Article 121480"},"PeriodicalIF":6.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Seismic response of steel moment connections to built-up box columns with varied diaphragm designs 不同膜片设计的箱形柱钢弯矩连接的地震反应
IF 6.4 1区 工程技术
Engineering Structures Pub Date : 2025-10-02 DOI: 10.1016/j.engstruct.2025.121495
Alejandro Santiago-Flores , Edgar Tapia-Hernández
{"title":"Seismic response of steel moment connections to built-up box columns with varied diaphragm designs","authors":"Alejandro Santiago-Flores ,&nbsp;Edgar Tapia-Hernández","doi":"10.1016/j.engstruct.2025.121495","DOIUrl":"10.1016/j.engstruct.2025.121495","url":null,"abstract":"<div><div>This study investigates the seismic behavior of steel moment connections between I-shaped beams and built-up box columns incorporating internal, through, and external diaphragm configurations. These connection types were evaluated through full-scale cyclic tests and nonlinear finite element analysis (FEA). The experimental program assessed cumulative ductility, energy dissipation, and failure mechanisms, revealing that diaphragm placement critically influences plastic hinge formation and damage concentration. Specimens with external diaphragms demonstrated superior ductility and energy dissipation, while internal and through diaphragm configurations exhibited brittle fracture near the column face. Fractographic and metallographic analyses confirmed that failure was driven by geometric detailing rather than weld defects or material inconsistencies. A unified multilinear envelope curve was proposed to model the force-deformation behavior of these connections, addressing gaps in current design standards. The findings offer practical recommendations for diaphragm detailing and nonlinear modeling of box-column connections under seismic demands.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"345 ","pages":"Article 121495"},"PeriodicalIF":6.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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