Structures最新文献_第9页

Analyzing coseismic displacement of the M7.7 Myanmar earthquake on march 28, 2025, using Sentinel-1 InSAR data 利用Sentinel-1 InSAR数据分析2025年3月28日缅甸7.7级地震同震位移

IF 3.9 2区工程技术

Structures Pub Date : 2025-07-16 DOI: 10.1016/j.istruc.2025.109718

Sajid Hussain , Bin Pan , Wajid Hussain , Muhammad Ali , Meer Muhammad Sajjad , Zeeshan Afzal , Aqil Tariq

{"title":"Analyzing coseismic displacement of the M7.7 Myanmar earthquake on march 28, 2025, using Sentinel-1 InSAR data","authors":"Sajid Hussain , Bin Pan , Wajid Hussain , Muhammad Ali , Meer Muhammad Sajjad , Zeeshan Afzal , Aqil Tariq","doi":"10.1016/j.istruc.2025.109718","DOIUrl":"10.1016/j.istruc.2025.109718","url":null,"abstract":"<div><div>The 2025 M<sup>7.7</sup> Myanmar earthquake, the most powerful seismic event in the region since 1912, occurred along the Sagaing Fault near Mandalay on 28 March, causing extensive damage. This study leverages Sentinel-1 Interferometric Synthetic Aperture Radar (InSAR) data to quantify coseismic and preseismic displacements along the Sagaing Fault. The primary objective is to enhance the understanding of the seismic behavior and fault mechanics by analyzing seismic displacement patterns. Differential InSAR (DInSAR) and the Small Baseline Subset (SBAS) methods were employed to estimate ground displacements caused by the mega-earthquake event by utilizing Sentinel-1 SAR data to generate coseismic and preseismic displacement maps. The results reveal a coseismic displacement range of 244 to −712 mm, with the highest deformation rates observed near the epicenters of the M<sup>7.7</sup> mainshock and the subsequent M<sup>6.7</sup> aftershock. The high-resolution interferogram generated through DInSAR enabled the precise mapping of deformation zones, revealing the spatial distribution of ground displacements with a high degree of accuracy. SBAS analysis highlights the preseismic deformation dynamics and the variation in ground deformation following the earthquake. Time-series analysis indicates an average preseismic subsidence of approximately 66 mm for the selected pixels, which possess a mean coherence and Root Mean Square Error (RMSE) of 0.79 and 2.19 mm, respectively, suggesting continued slip along the fault. The findings demonstrate the effectiveness of Sentinel-1 InSAR data in capturing coseismic deformation, providing valuable insights into the tectonic behavior of the region. This study enhances the understanding of seismic hazards in Myanmar and underscores the utility of InSAR techniques for monitoring earthquake-induced displacements.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"80 ","pages":"Article 109718"},"PeriodicalIF":3.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Automated modal identification of offshore wind turbine structure under mixed harmonic and random excitations 海上风电机组结构在谐波和随机混合激励下的模态自动识别

IF 3.9 2区工程技术

Structures Pub Date : 2025-07-16 DOI: 10.1016/j.istruc.2025.109706

Jing Song , Zong-Long Wu , Jia-Le Shi , Kang Zhou , Li-Ji Wang , Zhen-Ru Shu , Ming-Gang Duan

{"title":"Automated modal identification of offshore wind turbine structure under mixed harmonic and random excitations","authors":"Jing Song , Zong-Long Wu , Jia-Le Shi , Kang Zhou , Li-Ji Wang , Zhen-Ru Shu , Ming-Gang Duan","doi":"10.1016/j.istruc.2025.109706","DOIUrl":"10.1016/j.istruc.2025.109706","url":null,"abstract":"<div><div>Global warming and the increasing demand for renewable energy have accelerated the rapid development of offshore wind energy. As the primary equipment in this field, offshore wind turbines (OWTs) operate in complex environments subjected to both harmonic and random excitations, complicating the accurate identification of their structural dynamic properties. This paper presents an automated modal identification approach for OWTs under mixed harmonic and random excitations, by integrating a Kalman filter-based periodic sub-signal identification approach, a deep learning neural network, and an improved stochastic subspace identification technique. The proposed approach can effectively eliminate the influence of harmonic excitations, thereby ensuring accurate identification of structural modal parameters. Validation is performed through numerical simulations of a simplified wind turbine model and field measurements from two OWTs in the Yangjiang wind farm, China. The results demonstrate that the modal parameters identified by the proposed approach closely match the theoretical values and those obtained from a reference method. This research is expected to provide an effective method for accurately estimating the modal parameters of OWTs.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"80 ","pages":"Article 109706"},"PeriodicalIF":3.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Double brick walls with partial-height steel mullions under one-way vertical bending 双砖墙，部分高钢竖框，单向垂直弯曲

IF 3.9 2区工程技术

Structures Pub Date : 2025-07-16 DOI: 10.1016/j.istruc.2025.109698

Stefan Brestovac , Sarkar Noor-E-Khuda

{"title":"Double brick walls with partial-height steel mullions under one-way vertical bending","authors":"Stefan Brestovac , Sarkar Noor-E-Khuda","doi":"10.1016/j.istruc.2025.109698","DOIUrl":"10.1016/j.istruc.2025.109698","url":null,"abstract":"<div><div>To improve the out-of-plane (OOP) bending capacity of slender double brick (DB) walls and meet the design OOP load resulting from wind pressure, steel mullions (SMs) are used as reinforcement placed into the cavity between the external and internal masonry leaves of the wall. The literature presents limited data on the performance of DB walls with SMs under OOP loading. There is no guidance available to optimise the SMs within the DB walls. As such, structural engineers design these walls solely relying on the capacity of the SMs and ignoring the contribution of the DB walls in the load-resisting mechanism. Such a practice not only results in expensive design but also raises concern over the safety of such systems. This paper presents the OOP bending capacity of DB walls with partial-height SMs. A series of 04 full-scale DB walls of dimensions 2656 mm height × 935 mm width were tested under airbag surface pressure loading. The walls were constructed with partial-height SMs of heights of 0.5 m, 1.0 m and 1.5 m alongside a DB wall without any SM. The load-displacement behaviour, failure mode and structural performance parameters, i.e., stiffness and ductility of the tested walls have been analysed in detail. It is found that the presence of the partial-height SM increases the OOP bending capacity up to 149 % at the point of the first crack in addition to improvements in maximum OOP bending capacity, failure mode, stiffness, ductility and post-peak strength degradation of the DB walls.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"80 ","pages":"Article 109698"},"PeriodicalIF":3.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Ultimate shear capacity of FRP-reinforced concrete beams: Test database and an improved design model frp -钢筋混凝土梁的极限抗剪承载力：试验数据库和改进设计模型

IF 3.9 2区工程技术

Structures Pub Date : 2025-07-16 DOI: 10.1016/j.istruc.2025.109677

Bo Di , Yu Zheng , JinJing Liao , Jun-Tian Fang , Jun-Jie Zeng , Yan Zhuge

{"title":"Ultimate shear capacity of FRP-reinforced concrete beams: Test database and an improved design model","authors":"Bo Di , Yu Zheng , JinJing Liao , Jun-Tian Fang , Jun-Jie Zeng , Yan Zhuge","doi":"10.1016/j.istruc.2025.109677","DOIUrl":"10.1016/j.istruc.2025.109677","url":null,"abstract":"<div><div>The current design provisions for fiber-reinforced polymer (FRP)-reinforced concrete beams under shear actions are demonstrated to be too conservative. To this end, a total of 576 test results of FRP-reinforced concrete beams experiencing shear failures were collected in this study. The test results were categorized into three databases. Database D1 contains 390 datasets without FRP stirrups, which was used to study the concrete contribution (<span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>). Database D2 includes 59 datasets which were retrieved from experiments on specimens with or without FRP stirrups, allowing for the separation and investigation of the FRP stirrup contribution (<span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span>). The performance of current design codes was assessed against the 127 datasets with FRP stirrups in Database D3 which is independent of D1 and D2. Assessment results revealed that CSA S806–12 has the best performance among the design codes in predicting <span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>, probably because it considers the arch effect, while it may be inappropriate to adopt constant stirrup strain limits (<span><math><msub><mrow><mi>ε</mi></mrow><mrow><mi>fv</mi></mrow></msub></math></span>) in computing <span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span>. In this light, based on the shear design philosophy of CSA S806–12, the arch effect factor and a more accurate equation for <span><math><msub><mrow><mi>ε</mi></mrow><mrow><mi>fv</mi></mrow></msub></math></span> are proposed. Assessing against D3, the proposed model outperformed current design codes with a least error (19 %) and a smallest dispersion.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"80 ","pages":"Article 109677"},"PeriodicalIF":3.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Effective moment of inertia for predicting deflections of prestressed UHPC beams 预测预应力超高压混凝土梁挠度的有效转动惯量

IF 3.9 2区工程技术

Structures Pub Date : 2025-07-15 DOI: 10.1016/j.istruc.2025.109686

Pengteng Ning , Fei Peng , Weichen Xue

{"title":"Effective moment of inertia for predicting deflections of prestressed UHPC beams","authors":"Pengteng Ning , Fei Peng , Weichen Xue","doi":"10.1016/j.istruc.2025.109686","DOIUrl":"10.1016/j.istruc.2025.109686","url":null,"abstract":"<div><div>The bridging mechanism of steel fibers in ultra-high performance concrete (UHPC) significantly enhances the post-cracking stiffness of prestressed UHPC beams. Despite this beneficial effect, most existing design guidelines neglect the contribution of steel fibers when determining service deflections. This paper proposes a mechanics-driven yet practical approach for predicting the instantaneous deflection of prestressed UHPC beams under service loads. Firstly, a validated moment-curvature procedure is developed to explicitly capture the steel fiber bridging effect in analyzing the tension-stiffening behavior of beams at service loads. The analytical results reveal that prestressed UHPC sections exhibit an almost fully sustained tension-stiffening response. Subsequently, a curvature integration-based method is employed to derive design equations for the effective moment of inertia of prestressed UHPC beams. Then, a critical section-based effective moment of inertia is recommended for design purpose. Finally, the proposed approach is evaluated by comparing its predictions with experimental data from 38 prestressed UHPC beams. The mean values of experimental-to-predicted deflection ratio for two selected service load levels are 0.914 and 0.952, with the corresponding standard deviations being 0.173 and 0.198, respectively.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"80 ","pages":"Article 109686"},"PeriodicalIF":3.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Behaviour of polyurea coated RC beams subjected to single and repeated blast loading: Damage characteristics and assessment 单次和多次爆炸荷载作用下聚脲包覆RC梁的性能：损伤特性和评估

IF 3.9 2区工程技术

Structures Pub Date : 2025-07-15 DOI: 10.1016/j.istruc.2025.109594

Yuxuan Gao , Xin Wang , Yuting Wang , Chong Ji , Gang Wu , Chen Tao , Kaikai Zhang

{"title":"Behaviour of polyurea coated RC beams subjected to single and repeated blast loading: Damage characteristics and assessment","authors":"Yuxuan Gao , Xin Wang , Yuting Wang , Chong Ji , Gang Wu , Chen Tao , Kaikai Zhang","doi":"10.1016/j.istruc.2025.109594","DOIUrl":"10.1016/j.istruc.2025.109594","url":null,"abstract":"<div><div>As an important bearing part in a building, a reinforced-concrete (RC) beam may subject to multiple blast impact loads in a blast accident, which will affect the overall stability of the building. In this study, repeated blast impact tests of polyurea-coated reinforced-concrete beams were carried out, and the microstructural changes of polyurea under repeated blast loading were analyzed by scanning electron microscopy. Then, with the help of numerical simulations, the full restart algorithm was used to analyze the dynamic response processes of RC beams under repeated blast loads, and the variation characteristics of the local damage and deformation damage of RC beams under different numbers of blasts, blast proportion distances, and polyurea thicknesses were explored. Finally, the damage characteristics of reinforced-concrete beams under repeated blast impact loads were analyzed and evaluated based on the change of the residual bearing capacity. The results showed that the residual bearing capacity of the reinforced-concrete increased with the increase in the polyurea thickness and blast scaled distance. Compare with original bare RC beams, the bearing capacity of the specimens under first and second blast impacts decreased 59.9 % and 76.4 % respectively. While compare with original polyurea coated RC beams, this bearing capacity under first and second blast impacts decreased 41.3 % and 50.0 % respectively when the polyurea thickness was 4.5 mm, thereby underscoring the significant positive role of polyurea in maintaining the post-impact bearing capacity of the beam structure.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"80 ","pages":"Article 109594"},"PeriodicalIF":3.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144623716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 concrete reinforced with flexible fiber reinforced polymer strips or grids: Concept and bond tests 用柔性纤维增强聚合物条或网格增强的3D打印混凝土：概念和粘结测试

IF 3.9 2区工程技术

Structures Pub Date : 2025-07-15 DOI: 10.1016/j.istruc.2025.109693

Tao Ding , Haining Dong , Paweł Sikora , Guan Lin

{"title":"3D printed concrete reinforced with flexible fiber reinforced polymer strips or grids: Concept and bond tests","authors":"Tao Ding , Haining Dong , Paweł Sikora , Guan Lin","doi":"10.1016/j.istruc.2025.109693","DOIUrl":"10.1016/j.istruc.2025.109693","url":null,"abstract":"<div><div>One of the major challenges for the wide application of three-dimensional (3D) printed concrete lies in the lack of a reliable and convenient reinforcement procedure for improving the durability and structural performance of the printed structures. This paper presents two innovative reinforcing methods using fiber reinforced polymer (FRP) grids or strips, i.e., the synchronous printing method and the inter-layer laying method. By capitalizing the flexibility of FRP grids/strips, the proposed reinforcing methods aim to achieve the printing of concrete and reinforcement synchronously. As the first step, an experimental program was conducted to evaluate the bond performance between FRP and 3D-printed concrete. To this end, 3D-printed concrete specimens with FRP strips or grids embedded were fabricated and pull-out tests were conducted. The effects of various key parameters on the bond performance were examined in detail. The test results showed that the bond strength between FRP and 3D-printed concrete could reach above 14.0 MPa for specimens fabricated with the synchronous printing method and above 4.0 MPa for those with the inter-layer laying method, demonstrating the great potential of the proposed reinforcing methods in practice.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"80 ","pages":"Article 109693"},"PeriodicalIF":3.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144623715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 the bond behavior between UHPC and HSSB: Experimental investigation and numerical simulation UHPC与HSSB粘结行为的实验研究与数值模拟

IF 3.9 2区工程技术

Structures Pub Date : 2025-07-15 DOI: 10.1016/j.istruc.2025.109652

Rui Liang, Yuqing Han, Yongjun Qin, Jianhu Wang

{"title":"Study on the bond behavior between UHPC and HSSB: Experimental investigation and numerical simulation","authors":"Rui Liang, Yuqing Han, Yongjun Qin, Jianhu Wang","doi":"10.1016/j.istruc.2025.109652","DOIUrl":"10.1016/j.istruc.2025.109652","url":null,"abstract":"<div><div>Ultra-High Performance Concrete (UHPC) has been widely applied to engineering structures due to its excellent mechanical properties, and High-Strength Steel Bars (HSSB) has extremely high tensile strength. The combination of both enhances structural safety and durability. To investigate the bond behavior between UHPC and HSSB, an improved center pullout test setup was used, avoiding compressive stress fields around the steel bars during testing. A total of 57 UHPC specimens were tested to examine the effects of steel fiber content, aspect ratio, type, concrete cover thickness, anchorage length, and reinforcement grade on bond performance. Results showed that increasing steel fiber content to 2 % led to a 70.63 % increase in bond strength. Higher fiber aspect ratios also improved bond strength, while excessive fiber content and aspect ratios negatively impacted bond performance due to uneven fiber distribution. Thicker concrete covers and higher-strength reinforcement enhanced bond strength, while longer anchorage lengths reduced it. It is proposed that the fiber characteristic factor(<em>λ</em><sub><em>f</em></sub>) and <em>FIER</em> parameters are used to reflect the contribution of steel fibers. Based on experimental data and literature, a bond strength prediction formula was established to accurately predict the bond strength at the interface between UHPC and high-strength steel bars, with an average value (AVG) of 1.072 and a coefficient of variation (COV) of 0.197. A two-stage bond stress-slip model considering steel fibers was proposed, matching experimental results. A refined 3D ABAQUS model validated the improved test setup and confirmed the experimental findings and proposed model.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"80 ","pages":"Article 109652"},"PeriodicalIF":3.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144623718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Mechanical and thermal properties of bamboo composite boards reinforced with glass fiber cloths and bonded by magnesium oxychloride cement 玻璃纤维布增强氯氧镁水泥粘结竹复合板的机械性能和热性能

IF 3.9 2区工程技术

Structures Pub Date : 2025-07-15 DOI: 10.1016/j.istruc.2025.109659

Baoshi Jiang, Huilong Wang

{"title":"Mechanical and thermal properties of bamboo composite boards reinforced with glass fiber cloths and bonded by magnesium oxychloride cement","authors":"Baoshi Jiang, Huilong Wang","doi":"10.1016/j.istruc.2025.109659","DOIUrl":"10.1016/j.istruc.2025.109659","url":null,"abstract":"<div><div>Bamboo is a fast-growing biomaterial material with excellent performance, but some problems such as combustibility and its utilizing form are not easy to process. In this paper, glass fiber cloth was used as the reinforcing material and bonded with magnesium oxychloride cement (MOC) to make a new green bamboo composite board that is carbon storage, environmentally friendly and non-combustible. Based on systematic research on the properties of MOC and bamboo strips, the mechanical and thermal properties of bamboo composite boards are studied. It mainly includes the effects of the raw material proportion of MOC and flue gas desulfurization gypsum (FG) on the mechanical properties of MOC, that of the density of fiberglass cloth on the performance of the composite boards. When the density of fiberglass cloth is 12 × 12 strands/cm<sup>2</sup> and the MOC with the optimal ratio are used, the mechanical properties of the composite board is optimal in the test of the single-ply bamboo strip composite board. The flexural strength of the composite board reaches 15.71 MPa in the cross-section parallel to the length direction of the bamboo strips. While the cross-section is perpendicular to the length direction of the bamboo strips, the flexural strength reaches 34.64 MPa. This difference is mainly related to whether the strength of bamboo material is utilized or not. Thermal performance tests show that the thermal conductivity of the composite boards was 0.1226 W∙(m·K)<sup>−1</sup>. As the double-ply bamboo strip composite board, in which the MOC with the optimal ratio is used, the first flexural strength of the composite panel reached 48.53 MPa, and the second flexural strength reached 38.71 MPa. The thermal conductivity of the composite boards was 0.1071 W∙(m·K)<sup>−1</sup>. The composite board can be used as a fireproof partition wall panel for the reason of the outer MOC, which meets Class A: Non-combustible material according to PRC National Standard (GB 8624–2012).</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"80 ","pages":"Article 109659"},"PeriodicalIF":3.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144623714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Progressive collapse resistance of steel frames with RBS connections under impact loading 冲击荷载作用下带有RBS连接的钢框架的抗递进倒塌性能

IF 3.9 2区工程技术

Structures Pub Date : 2025-07-15 DOI: 10.1016/j.istruc.2025.109676

Shi-chao Duan , Wei-hui Zhong , Chen Chen , Zheng Tan , Xing-you Yao , Bao Meng , Kang-ning Liu

{"title":"Progressive collapse resistance of steel frames with RBS connections under impact loading","authors":"Shi-chao Duan , Wei-hui Zhong , Chen Chen , Zheng Tan , Xing-you Yao , Bao Meng , Kang-ning Liu","doi":"10.1016/j.istruc.2025.109676","DOIUrl":"10.1016/j.istruc.2025.109676","url":null,"abstract":"<div><div>This study investigated the progressive collapse resistance of steel beam-column substructures with Reduced Beam Section (RBS) connections under impact loading. Finite element simulations were conducted using ABAQUS and validated against experimental results from drop-weight impact tests. This study investigated how variations in the mass of a drop hammer and its impact velocity affected the structural response, focusing on parameters such as the magnitude of impact force, impact duration, vertical displacement, resistance, and failure modes. Additionally, the effects of varying the dimensions and position of the flange reduction were analyzed. The dynamic response consisted of three phases: an inertial force phase, a platform resistance phase, and a separation phase. While peak impact force was largely unaffected by drop-weight mass, it increased significantly with impact velocity. For the same impact energy, changing the drop-weight mass led to greater platform forces and displacements than altering the velocity did. The failure mode consistently initiated at the bottom flange in the weakened zone and propagated through the web and top flange, culminating in complete fracture. Increasing the length of the weakened region enhanced ductility and delayed failure, though it caused earlier initiation of fracture as the weakened zone moved away from the beam end. These findings provide guidance for optimizing RBS connection design in steel frame structures subjected to dynamic loading.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"80 ","pages":"Article 109676"},"PeriodicalIF":3.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144623610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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