Structures最新文献

{"title":"Effect of CFRP tendon-strut system on the bearing performance of GFRP-aluminum space trusses","authors":"Da Li,&nbsp;Ruijie Zhu,&nbsp;Feng Li","doi":"10.1016/j.istruc.2025.109237","DOIUrl":"10.1016/j.istruc.2025.109237","url":null,"abstract":"<div><div>The low longitudinal elastic modulus of glass fiber-reinforced polymer (GFRP) material compared to that of steel material may lead to insufficient overall stiffness of its assembled space truss structure and stability problem of truss member. Inspired by steel beam string structure, prestressed carbon fiber-reinforced polymer (CFRP) tendon-strut systems were proposed and incorporated into the GFRP-aluminum space trusses to achieve enhancement of structural performance with less increase in structural weight. The effects of two types of tendon-strut systems on the bearing performance of the space trusses were investigated through three-point bending tests, and were compared with a control truss without tendon-strut system. The full-process mechanical response of all structural specimens during the elastic and nonlinear phases was analyzed and revealed, with the aid of fine line elements FE models. Furthermore, parametric analyses were carried out based on the verified FE models, including prestress level and diameter of CFRP tendons, as well as the rise-to-span ratio and sag-to-span ratio of the structure, on the ultimate load bearing performance of the prestressed structures. The results demonstrated that prestressing can significantly improve the bearing performance of the space trusses, and a series of design recommendations were proposed for this novel structure form.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109237"},"PeriodicalIF":3.9,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099000","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}

{"title":"Performance-based seismic design of buckling−restrained knee−braced frames: Cumulative damage optimization and design lateral force distribution","authors":"Natakan Naiyana ,&nbsp;Sutat Leelataviwat ,&nbsp;Iman Hajirasouliha","doi":"10.1016/j.istruc.2025.109167","DOIUrl":"10.1016/j.istruc.2025.109167","url":null,"abstract":"<div><div>Buckling−restrained knee−braced frames (BRKBFs), which utilize relatively short buckling−restrained knee braces as energy dissipation devices, can provide an efficient seismic resistant structural system suitable for both seismic design of new buildings and retrofitting of existing structures. However, the optimum design of such systems under seismic excitations can be challenging due to their complex nonlinear behavior affected by cumulative damage. This study aims to develop a practical method for optimum seismic design of BRKBFs based on the concept of uniform damage distribution (UDD). For the first time, the UDD optimization framework is adopted to optimize the height-wise distribution of cumulative damage, as defined by the Park-Ang damage model, allowing direct control over damage levels during the optimization process. This approach enhances computational efficiency by gradually redistributing the underutilized capacity of energy dissipation devices, leading to an enhanced overall seismic performance by fully exploiting the energy dissipation capacity of the system. To demonstrate the efficiency of the proposed method, 3 −, 6 −, and 9 −story BRKBFs were first designed by using an energy−based design method. The cumulative damage and height−wise distribution of the damage were assessed by nonlinear analyses under a set of ground motions. The UDD optimization method was then applied to achieve the uniform damage state. Finally, the optimization results were used to develop an optimum lateral force distribution for more efficient seismic design of BRKBFs. The outcomes indicate that using the energy−based design and optimization method proposed in this study can provide an efficient methodology to achieve the optimum cumulative damage distribution and considerably improve the seismic performance of BRKBFs, leading to up to 28 % lower damage index. The proposed methodology is general and can be applied to the optimization and development of a suitable lateral force distribution for different structural systems.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109167"},"PeriodicalIF":3.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089721","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}

{"title":"An arch bridge-inspired separable and reusable progressive energy absorption system via squash-friction strategy","authors":"Lijun Zhang ,&nbsp;Zengshen Yue ,&nbsp;Guo Li ,&nbsp;Xiaolong Gao ,&nbsp;Qiancheng Zhang","doi":"10.1016/j.istruc.2025.109183","DOIUrl":"10.1016/j.istruc.2025.109183","url":null,"abstract":"<div><div>Energy-absorbing structures have been a focal point of research across a range of application potentials, including vehicles, aerospace, sports protective equipment, and commodity packaging, where impact mitigation is of great importance. Conventional energy absorption systems are typically monolithic and designed for disposable scenarios, which results in a waste of materials and an increase in costs. This study proposes a novel arch bridge-inspired separable and reusable progressive energy-absorbing system, which is composed of two staggered trapezoidal embedded complementary structures. By combining this structural design with hyperelastic materials, the system can efficiently absorb and release energy under cyclic extreme loadings. The implementation of a squash-friction strategy enables the structural system to achieve progressive energy absorption during single compression cycles. Furthermore, the hyperelastic parent material leads to an autonomous rebound of the structure after loading, facilitating the inspection, repair, or replacement of individual components, thereby significantly extending the service life of the system. Experimental results demonstrate that the energy absorption capacity of the system remains stable after multiple cycles of compressive loading, indicating its excellent reusability and economic benefits. This study presents a novel energy absorption solution with a wide range of potential applications in the engineering field.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109183"},"PeriodicalIF":3.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089786","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}

{"title":"Seismic behavior of RC bridges with various types of irregularities under chloride-induced corrosion","authors":"Sepehr Nazari,&nbsp;Payam Tehrani","doi":"10.1016/j.istruc.2025.109218","DOIUrl":"10.1016/j.istruc.2025.109218","url":null,"abstract":"<div><div>This research investigates the seismic behavior of 16 RC bridge models by accounting for the influence of chloride-related corrosion in their columns. The bridges include one regular and 15 irregular configurations, incorporating various types and combinations of irregularities. Structural irregularities, such as unequal column heights, unequal span lengths, and plan curvature, influence geometry and stiffness distribution, significantly impacting seismic behavior. Additionally, chloride accumulation over time leads to steel bar corrosion, degrading the mechanical properties of RC bridge columns. To assess these effects, all bridge configurations were subjected to corrosion levels of 0 %, 10 %, 20 %, and 30 %, and analyzed using inelastic time history analysis (ITHA) with 11 far-field earthquake records. The results show that corrosion increases column drift and maximum deck displacement, significantly impacting seismic safety. In particular, demand-to-capacity ratios increased by up to 80 % in certain irregular configurations, emphasizing the need for corrosion mitigation and seismic retrofitting in aging infrastructure. This study offers novel insights into the coupled effects of material degradation and structural irregularities, a critical but underexplored aspect of seismic bridge performance.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109218"},"PeriodicalIF":3.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089783","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}

{"title":"Dynamic shear responses of RC circular columns strengthened with recycled FRPs","authors":"Zhi-Wei Yan ,&nbsp;Yanchen Song ,&nbsp;Yu-Lei Bai ,&nbsp;Kun Liu","doi":"10.1016/j.istruc.2025.109234","DOIUrl":"10.1016/j.istruc.2025.109234","url":null,"abstract":"<div><div>Increasingly heavy urban traffic exacerbates vehicle impacts on reinforced concrete (RC) bridge columns, possibly leading to shear failure and structural collapse. To enhance the dynamic shear resistance of these columns, fiber reinforced polymers (FRPs) made from recycled polyethylene terephthalate (PET) plastic bottles were used for external strengthening. PET FRPs offer an eco-friendly alternative by repurposing plastic waste, reducing pollution, and promoting circular economy. This study focused on the dynamic shear responses of RC columns strengthened with PET FRPs. The influences of FRP types and number of FRP layers were experimentally revealed in terms of the failure modes, impact force, reaction force, shear force and impact force-displacement relationship. It was found that significant shear damage occurred in RC columns under horizontal impact loads, with carbon FRPs (CFRPs) strengthening unable to alter the failure mode. Nevertheless, the use of PET FRPs transformed the failure mode to a flexural-shear mode, significantly reducing the impact duration, maximum and residual displacements, and energy dissipation. Moreover, a finite element model was validated to describe the impact resistance of PET FRP-strengthened RC columns, as supported by experimental data. A parametric study further investigated the effects of impact velocity, impact mass, number of FRP layers, and reinforcement ratios on the dynamic shear responses. Based on the truss-arch model, a dynamic shear strength model was proposed and can well predict the dynamic shear capacity of FRP-strengthened RC circular columns.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109234"},"PeriodicalIF":3.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089719","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}

{"title":"Study on the seismic performance of reinforced concrete framed exterior joints with slabs","authors":"Junhong Yin ,&nbsp;Yuying Xu ,&nbsp;Yingjun Wang ,&nbsp;Bin Zhang ,&nbsp;Miao Wang","doi":"10.1016/j.istruc.2025.109127","DOIUrl":"10.1016/j.istruc.2025.109127","url":null,"abstract":"<div><div>Due to the existence of cast-in-place slab, strong column-weak beam failure mechanism of frame structure will be changed into strong beam-weak column failure mechanism, so it is very necessary to study the influence of cast-in-place slab on seismic performance of frame joints. This paper aims to investigate the seismic performance of reinforced concrete (RC) framed exterior joints with slabs experimentally and numerically. A total of two RC exterior joint slabs were constructed and tested to study their seismic performance under quasi-static reversed cyclic load, including failure modes, crack patterns, stiffness degradation, load capacity and ductility, energy dissipation capacity, and the stress distribution of longitudinal bars and distributed reinforcement of cast-in-place slabs, hysteretic property of the plastic hinge region of beam end was also analyzed. It was found that ultimate bearing capacity and ductility of specimen BSCJ2 showed slightly increase compared to specimen BSCJ1, because that the slab width of specimen BSCJ2 reaches 8 times slab height. A numerical study, using ABAQUS, was also used to study the seismic performance of RC exterior joints for further, the result of the proposed numerical model shows a good agreement with test data. Furthermore, parametric and orthogonal experimental design study were completed to investigate the seismic performance of RC exterior joints, including beam height, beam span, beam-to-slab stiffness ratio, and longitudinal reinforcement ratios. The results indicate that beam-to-slab stiffness ratio significantly enhances ultimate load capacity, ductility and energy dissipation capacity, while the slab reinforcement ratio improves slightly the load-bearing capacity and energy dissipation capacity. On the contrary, increasing the beam span reduces ultimate bearing capacity, ductility and energy dissipation capacity. The orthogonal analysis further demonstrated that beam span exerted the most pronounced influence on both ductility and energy dissipation capacity, followed by beam-to-slab stiffness ratio, while slab longitudinal reinforcement ratio showed relatively minimal impact.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109127"},"PeriodicalIF":3.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089784","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}

{"title":"Evaluation of different types of advanced analysis for the study of the seismic behavior of masonry minarets","authors":"Arezu Feizolahbeigi,&nbsp;Nuno Mendes","doi":"10.1016/j.istruc.2025.109134","DOIUrl":"10.1016/j.istruc.2025.109134","url":null,"abstract":"<div><div>Numerical methods are considered effective tools for assessing the structural response of various types of buildings, including historic structures. As slender structures, minarets are vulnerable to loading and deformation, including seismic loads. This study aims to explore various numerical tools for evaluating the seismic response of a masonry minaret. Within this context, a structural assessment was conducted on a typical minaret that exhibits common characteristics of minarets. Pushover analysis with uniform and modal lateral load distribution patterns was carried out, accounting for physical and geometric nonlinearities, with results presented in terms of displacements and damage patterns. Subsequently, dynamic time history analysis was performed by applying the Bam earthquake records at the model's base. To further investigate the minaret's response to dynamic loads and to identify the failure mechanisms, the incremental non-linear dynamic analysis was carried out, scaling the Bam records to 0.5, 0.4, 0.3, 0.2, and 0.1.</div><div>The study's results demonstrated the effectiveness of finite element analysis in assessing the seismic behavior of minarets. Two failure mechanisms were revealed. The concentrations of tensile and shear stresses at the junction between the transition segment and the cylindrical body of the minaret were identified as the leading causes of the collapse. The results denote that the proposed scaling approach in non-linear dynamic analysis can precisely capture the damage propagation in the structure compared to the pushover analysis. In terms of maximum displacement, the nonlinear dynamic analysis produced more accurate results by incorporating all forces involved in the dynamic equilibrium and capturing the structure's full response to the ground motion's varying amplitude and frequency content compared to the pushover methods, which rely on static force distributions. Finally, the study concludes that the pushover analysis is conservative for slender masonry structures. It identifies damage-prone areas but misses dynamic effects and progressive damage. While useful for preliminary assessments, it is insufficient for safety evaluation. However, the nonlinear dynamic analysis provided a more detailed prediction of the damage pattern and illustrated damage progression in the minaret over subsequent stages.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109134"},"PeriodicalIF":3.9,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089787","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}

{"title":"PI-CNN: A physics-informed machine learning model for the structural analysis of deep beams","authors":"Abdullah H. Azbah,&nbsp;Idris A. Musa","doi":"10.1016/j.istruc.2025.109087","DOIUrl":"10.1016/j.istruc.2025.109087","url":null,"abstract":"<div><div>Deep beams are critical structural elements widely used in various engineering applications, including bridges, high-rise buildings, and industrial structures. Their complex behaviour under loading such as the large shear forces and the nonlinear stress distribution present a notable challenge. This complexity causes the analysis and design process more difficult. Traditional methods such as the finite element method (FEM) have been widely used in the analysis of deep beams. However, these methods often require extensive computational resources and/or significant human effort. This study presents the development and application of a novel physics-informed convolutional neural network (PI-CNN) model for the structural analysis of deep beams. PI-CNN was developed by incorporating existing knowledge about deep beams in the form of constative laws into the training process. This ensures that PI-CNN produces physically consistent predictions. The performance of the PI-CNN was evaluated against cases from the literature, and parametric studies were used on the different parameters affecting its performance. This study found that the Incorporation of physics knowledge has enhanced the predictive capabilities of PI-CNN and reduced its dependency on large datasets. Furthermore, PI-CNN was able to accurately predict the structural response of deep beams faster than traditional methods while maintaining the same level of accuracy.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109087"},"PeriodicalIF":3.9,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942083","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}

{"title":"Numerical modeling of web crippling failure of trapezoidal sheeting at the end support","authors":"Zsolt Nagy ,&nbsp;Örs Nagy ,&nbsp;Miquel Casafont ,&nbsp;Xavier Centelles ,&nbsp;Oriol Bové ,&nbsp;Annabella Sánduly ,&nbsp;Béla Bács","doi":"10.1016/j.istruc.2025.109097","DOIUrl":"10.1016/j.istruc.2025.109097","url":null,"abstract":"<div><div>The structural behavior of thin-walled trapezoidal sheeting under web crippling is complex to predict due to the interaction of several interrelated parameters. In that sense, experimental tests provide reliable results, but advanced numerical models, previously validated with experimental tests, offer a less time-consuming, more cost-effective and flexible alternative for studying this phenomenon. This research paper presents a numerical model that focuses on the web crippling resistance of trapezoidal sheeting (cross section with multiple webs) at end supports, where little literature is found compared to single web members and interior supports. A geometrically and materially nonlinear analysis (GMNIA) was done with finite element (FE) models. The study provides a description of the FE modeling approach, including the boundary conditions, mesh and loading configurations, and material properties derived from experimental tests. Once validated, these models were used to create a simplified parametric model for time-efficient investigation of the effects of support configurations, specifically the bearing width and free-end length, on the web crippling mechanism. The results demonstrate the influence of these parameters on stress distributions and failure modes, with significant differences in structural behavior based on the support setup. This research offers practical insights into the web crippling failure and resistance of trapezoidal sheeting, contributing to the development of more accurate design methodologies.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109097"},"PeriodicalIF":3.9,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143934730","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}

{"title":"Investigation of repeated tightening behavior of zinc-plated bolts under different torque levels","authors":"Yixuan Jiao,&nbsp;Juhyun Nam,&nbsp;Dongwon Kim,&nbsp;Je Hoon Oh","doi":"10.1016/j.istruc.2025.109100","DOIUrl":"10.1016/j.istruc.2025.109100","url":null,"abstract":"<div><div>Zinc-plated bolts are used widely in various industries to improve corrosion resistance in bolted joints. However, the repeated tightening commonly carried out during maintenance or daily inspections can change the frictional behavior of a bolt’s contact surfaces, which may adversely affect tightening behavior. To ensure the reliability of reused zinc-plated bolts, this study investigated the effect of repeated tightening on the coefficient of friction, preload, wear, and stress distribution in bolts. Given the varying preload requirements across industries and are usually controlled by adjusting the tightening torque, repeated tightening experiments were conducted at three tightening torque levels. The lubrication and nut replacement were also considered in the most severe wear condition. The distribution of bolt stress during repeated tightening was investigated using finite element analysis (FEA). Results showed that repeated tightening of zinc-plated bolts was significantly affected by the torque level and tightening condition. Under the three torque levels, repeated tightening decreased the preload to varying degrees. In addition, the preload exhibited different trends under different levels of torque. When the nut was replaced before each retightening, the preload decreased and stabilized at 80 % of the initial value, while the preload of lubricated bolts remained nearly consistent during repeated tightening. The FEA results indicate that repeated tightening of bolts under dry conditions can lead to greater stress concentration, even if the preload level is similar to that of the first tightening. Conversely, when the bolt was repeatedly tightened after lubrication, the stress distribution was nearly identical to that of the initial tightening. These results provide useful guidance for the future design of bolted joints.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109100"},"PeriodicalIF":3.9,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143934731","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}