Structures最新文献_第3页

New method for damage detection in steel beam using time-frequency functions and machine learning 基于时频函数和机器学习的钢梁损伤检测新方法

IF 3.9 2区工程技术

Structures Pub Date : 2025-05-28 DOI: 10.1016/j.istruc.2025.109236

Hesam Hooshyar , Hamid Reza Ahmadi , Mahmoud Bayat , Erfan Hosseinzadeh , Navideh Mahdavi , Mohammad Hossein Najafi

{"title":"New method for damage detection in steel beam using time-frequency functions and machine learning","authors":"Hesam Hooshyar , Hamid Reza Ahmadi , Mahmoud Bayat , Erfan Hosseinzadeh , Navideh Mahdavi , Mohammad Hossein Najafi","doi":"10.1016/j.istruc.2025.109236","DOIUrl":"10.1016/j.istruc.2025.109236","url":null,"abstract":"<div><div>The science of structural health monitoring (SHM) has received great attention in recent years and has reached a major milestone in its evolution. In this research, a new methodology for detecting damage in steel beams using machine learning will be introduced. Ease of use, high accuracy and reduction of monitoring costs have been among the presuppositions considered for presenting the new method. In this research, both the laboratory model and the analytical model have been used. At first, a 14 IPE steel beam was subjected to a dynamic load called an impact load, and the response signals were recorded in the undamaged state and under damage scenarios by acceleration mapping sensors. Then, the response signals were processed with quadratic time-frequency function and Smoothed Pseudo-Wigner-Ville function and the dynamic characteristics of the beams were extracted and prepared for machine learning training in order to detect damage. By using these data as machine learning input and determining the proportional outputs relative to the percentages of damage of each scenario, XGBOOST and multi task elastic net (MTEN) machine learning algorithms were trained. The K-fold index was used to evaluate the performance of machine learning models and algorithms, and the calculation results showed that the XGBOOST algorithm has a higher detection accuracy than the Multi-Task Elastic Net (MTEN) algorithm. In order to evaluate, validate and ensure the performance of the proposed method, an apple scenario was used to use both machine learning algorithms to predict damage. While the results showed the high detection accuracy of both methods and the lowest error rate in determining the location and severity of the damage, the high accuracy of the XGBOOST algorithm in identifying the severity and location of the damage was confirmed.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109236"},"PeriodicalIF":3.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147762","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

High strength and different square sections with axially loaded cold-formed tubular members 高强度和不同的方截面轴向加载冷弯管构件

IF 3.9 2区工程技术

Structures Pub Date : 2025-05-28 DOI: 10.1016/j.istruc.2025.109268

Mariia Serous, Pooya Saremi, Iuliia Petukhovskaia, Wei Lu, Jari Puttonen

{"title":"High strength and different square sections with axially loaded cold-formed tubular members","authors":"Mariia Serous, Pooya Saremi, Iuliia Petukhovskaia, Wei Lu, Jari Puttonen","doi":"10.1016/j.istruc.2025.109268","DOIUrl":"10.1016/j.istruc.2025.109268","url":null,"abstract":"<div><div>This paper studies experimentally tensile coupons and stub columns to quantify the change of mechanical properties by cold forming in scaling factors and strength of axially loaded tubular members in two sizes and of two steel grades. At corners, the enhancement of 0.2% proof strength was about 10% less in high strength steel (HSS) profiles than in their mild steel peers and was about 5% less in smaller profiles than in larger ones as elastic deformations were greater in the smaller or HSS profiles. The ratio of tensile-to-yield strength was between 1.09 and 1.20 for all the studied profiles, satisfying the Eurocode requirements. The strains measured from tensile coupons partly fell below product limit of 3% but from column tests satisfied the requirements. The elastic modulus received from the larger section varied between 195000 N/mm<sup>2</sup> and 215000 N/mm<sup>2</sup>, which were 10-20% more than those from the smaller section. The elastic moduli were reduced if the section was smaller or was made of HSS. A two-stage material model was improved and validated experimentally for the steel grades and section size studied. The equations developed for corner strength predicted well the strength of stub columns with thick walls or smaller sections. The strength of the stub column of the larger profile received by scaling up the strength of the column of the smaller profile needs to be reduced up to 8% because the effects of cold forming depend on the size of the profile. Generally, the changes in values of the yield strength along the circumference of sections need to be considered.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109268"},"PeriodicalIF":3.9,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147763","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 basic mechanical properties of parallel Neosinocalamus affinis bamboo stand lumber 平行木参竹林木材基本力学性能研究

IF 3.9 2区工程技术

Structures Pub Date : 2025-05-27 DOI: 10.1016/j.istruc.2025.109254

Zhifan Wang , Haitao Li , Wenjing Zhou , Linji Ying

{"title":"Study on basic mechanical properties of parallel Neosinocalamus affinis bamboo stand lumber","authors":"Zhifan Wang , Haitao Li , Wenjing Zhou , Linji Ying","doi":"10.1016/j.istruc.2025.109254","DOIUrl":"10.1016/j.istruc.2025.109254","url":null,"abstract":"<div><div>In order to study the feasibility and reliability of the parallel <em>neosinocalamus affinis</em> bamboo stand lumber (hereinafter referred to as PNABSL), in practical engineering applications, and to study the future improvement and development of the PNABSL, this paper designed the basic mechanical property tests of PNABSL in terms of tension, compression, flexural and shear tests using <em>neosinocalamus affinis</em> as the test material, with a total of 280 specimens of the material properties, which were tested accordingly and the measured data were obtained. After that, the failure phenomena of the specimens were summarized; the load-displacement curves and stress-strain curves of the specimens were plotted; based on the Ramberg-Osgood model, the stress-strain relationship of the experimental materials was fitted to construct their constitutive relation; and the characteristic values of their mechanical properties were analyzed by parameters. The results showed that its average compression, tension, and shear strengths were 93.73 MPa, 196.6 MPa, and 15.8 MPa, respectively, with corresponding modulus of 19814 MPa, 27,102 MPa, and 19814 MPa, and the average bending strengths and modulus of 180 MPa and 66,961 MPa. Through the analysis, it was found that PNABSL has certain advantages to meet the requirements for the use of building structural materials. Finally, we compared the physical and mechanical properties of PANBSL with those of other engineered bamboo materials and wood. The results showed that the mechanical properties of PANBSL are excellent and relatively stable, and it has an outstanding development prospect in the field of building structures.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109254"},"PeriodicalIF":3.9,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139054","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 electrical conductivity model of concrete based on multiphase composite theory 基于多相复合理论的混凝土电导率模型研究

IF 3.9 2区工程技术

Structures Pub Date : 2025-05-27 DOI: 10.1016/j.istruc.2025.109159

Yongdong Meng , Weixi Zhu , Zhenglong Cai , Xiaowei Xu

{"title":"Study on electrical conductivity model of concrete based on multiphase composite theory","authors":"Yongdong Meng , Weixi Zhu , Zhenglong Cai , Xiaowei Xu","doi":"10.1016/j.istruc.2025.109159","DOIUrl":"10.1016/j.istruc.2025.109159","url":null,"abstract":"<div><div>Leakage detection is one of the core issues to ensure the safe operation of hydraulic buildings. Due to the high electrical conductivity of water, the change of water content at the leakage point will lead to a drastic change of conductivity, so the spatial distribution and structural characteristics of hydraulic concrete defects can be preliminarily explored by establishing a mathematical model of conductivity and water content, and taking the localized water content of the concrete as an indicator for identifying the leakage point. In this study, based on the multiphase composite theory, concrete is considered as a three-phase composite medium consisting of \"solid-water-gas\", aiming to establish a conductivity model related to porosity and water content in order to analyse the spatial distribution and movement of water in concrete. By conducting concrete conductivity experiments under varying aggregate volume fractions, porosity, and water content, model parameters were defined. The results indicate that the new model can predict conductivity within a larger range of porosity and water content, with errors not exceeding ± 9 % compared to experimental data. The mathematical relationship established by the model between conductivity and water content facilitates the identification of regions with anomalous water content, thereby providing a preliminary delineation of potential leakage points and approximate extent. This model offers theoretical guidance for non-destructive electrical detection of leakage areas in concrete.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109159"},"PeriodicalIF":3.9,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139038","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

The effect of window opening ratio on dome behavior in Ottoman historical masonry buildings 奥斯曼砖石历史建筑开窗率对穹顶性能的影响

IF 3.9 2区工程技术

Structures Pub Date : 2025-05-27 DOI: 10.1016/j.istruc.2025.109253

Sukran Tanriverdi, Fatih K. Firat

{"title":"The effect of window opening ratio on dome behavior in Ottoman historical masonry buildings","authors":"Sukran Tanriverdi, Fatih K. Firat","doi":"10.1016/j.istruc.2025.109253","DOIUrl":"10.1016/j.istruc.2025.109253","url":null,"abstract":"<div><div>In the present study, the effect of the window opening amount on the dome behavior was investigated experimentally and numerically. A total of three dome test elements were tested under the experimental setup that was prepared for this study to find the maximum horizontal loads and horizontal displacements corresponding to maximum load. The test domes were also analyzed numerically. Since the test results and the analysis results overlapped, an additional parametric study (in which variable drum height and opening amount were taken into account) was performed to examine the behaviors of the opening ratios on the dome with dome models that had different opening ratios (superficial 5 %, 7.5 %, 10 %, and 12.5 % openings). Analyzes were made for each opening ratio with twelve different dome models, one without a drum (pulley) and others with drum heights of 300 mm and 400 mm. The main purpose of this study is to investigate how window opening ratios and drum heights affect the strength and behavior of domes. At the end of the study, the results showed in the most general sense that the effect of the opening ratio on the dome behavior decreases when the height of the drum is increased. In addition, it was determined that as the window opening ratio in domes increases, the load carrying capacity decreases and the horizontal displacement increases.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109253"},"PeriodicalIF":3.9,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139055","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

Synergistic effect of carbon textile reinforced cementitious composites on tensile and flexural behaviour 碳纤维织物增强胶凝复合材料对拉伸和弯曲性能的协同效应

IF 3.9 2区工程技术

Structures Pub Date : 2025-05-27 DOI: 10.1016/j.istruc.2025.109249

Rose Dayaana , Chuanlong Zou , Borhan Uddin Rabbane , Chee Ghuan Tan , Kim Hung Mo , Geok Wen Leong

{"title":"Synergistic effect of carbon textile reinforced cementitious composites on tensile and flexural behaviour","authors":"Rose Dayaana , Chuanlong Zou , Borhan Uddin Rabbane , Chee Ghuan Tan , Kim Hung Mo , Geok Wen Leong","doi":"10.1016/j.istruc.2025.109249","DOIUrl":"10.1016/j.istruc.2025.109249","url":null,"abstract":"<div><div>Textile Reinforced Concrete (TRC) is a composite material that combines a cement-based matrix with textile mesh reinforcement to enhance mechanical properties. While previous research has explored different reinforcement materials, the synergistic effects of combining carbon textiles with Fiber Reinforced Cementitious Composites (FRCC) containing short fibres have been understudied. This study investigates the synergistic effects of combining carbon textile reinforcement and short Polyvinyl Alcohol (PVA) fibres in Carbon Textile Reinforced Cementitious Composites (CTRCC) to enhance tensile and flexural performance. Various configurations of carbon textile layers and PVA fibre dosages were tested, with flexural behaviour assessed using a four-point bending test and tensile performance evaluated through direct tensile tests. The results indicate that increasing carbon textile layers significantly boosts tensile strength and flexural performance, with three layers improving tensile stress by up to 2671.4 %. However, benefits diminished with the addition of layers beyond two. The optimal configuration was found to be 1.0 % PVA fibre combined with two carbon textile layers, yielding the highest load-bearing capacity and reducing strain. While 1.5 % PVA fibres increased crack formation and reduced crack spacing, excessive fibre content led to performance degradation due to poor dispersion and clustering. A negative synergistic effect was observed with 1.5 % PVA fibres, resulting in a 71.1 % reduction in performance compared to 1.0 % PVA fibres. The results contribute to a better understanding of the mechanical behaviour of CTRCC and provide insights for enhancing the durability and strength of cementitious composites.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109249"},"PeriodicalIF":3.9,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139042","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

Experimental investigation of shear behavior in precast concrete beams with steel bolted splice connections 钢筋螺栓连接混凝土预制梁抗剪性能试验研究

IF 3.9 2区工程技术

Structures Pub Date : 2025-05-27 DOI: 10.1016/j.istruc.2025.109261

Khalil Abualtayef , Wei Zhou

{"title":"Experimental investigation of shear behavior in precast concrete beams with steel bolted splice connections","authors":"Khalil Abualtayef , Wei Zhou","doi":"10.1016/j.istruc.2025.109261","DOIUrl":"10.1016/j.istruc.2025.109261","url":null,"abstract":"<div><div>Precast concrete structures with bolted connections offer significant advantages, including shorter construction times, improved quality control, and enhanced structural performance. This study investigates the shear behavior of precast concrete beams with steel-bolted splice connections (PCBSBs), which join the discontinuity of two short concrete beam segments, under monotonic loading. Afterwards, the shear performance of PCBSB beams was experimentally and analytically investigated. Six full-scale PCBSB specimens and one control concrete beam were tested to evaluate the effects of key parameters include the shear span ratio and steel plate thickness. The test results show that the failure modes of PCBSB beams are similar to those of reinforcement concrete beams, and the crack propagations can be well controlled by the steel plate thickness. Using a steel bolted connection with a thickness of 3 mm and 5 mm increased the shear crack load by 9 % and 24 %, respectively. After the loading reached 65 % of the peak load, the deflection of steel bolted connection begins to increase more than the shear load deflection till peak load. For beams with long shear span ratio, increase of steel plate thickness led to increase the stiffness, and peak load. Higher a/d ratios increase deflection and shift failure modes from ductile (shear-compression) to brittle (shear-tension). Finally, the experimental shear capacities of the PCBSBs exceeded the predictions of the GB, ACI, EN, and CSA standards for beams with a/d ratios of 1.5 and 2.0. However, discrepancies were observed for beams with a/d of 3.0, where flexural behavior becomes more dominant. Based on these findings, a preliminary design recommendation was proposed. Further studies were recommended to investigate the performance of beams with shorter a/d ratios and varying dimensions to optimize connection efficiency.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109261"},"PeriodicalIF":3.9,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147864","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

Experimental and analytical studies on the lateral bearing performance of disk lock steel tubular scaffold under horizontal load 水平荷载作用下盘式锁紧钢管脚手架横向承载性能的试验与分析研究

IF 3.9 2区工程技术

Structures Pub Date : 2025-05-27 DOI: 10.1016/j.istruc.2025.109290

Hongbo Liu , Yali He , Haijiang Zhang , Yaofeng Shi , Chongqin Ni , Qun Liu , Tianqi Hao , Zhihua Chen

{"title":"Experimental and analytical studies on the lateral bearing performance of disk lock steel tubular scaffold under horizontal load","authors":"Hongbo Liu , Yali He , Haijiang Zhang , Yaofeng Shi , Chongqin Ni , Qun Liu , Tianqi Hao , Zhihua Chen","doi":"10.1016/j.istruc.2025.109290","DOIUrl":"10.1016/j.istruc.2025.109290","url":null,"abstract":"<div><div>In the practical lateral support structure of the single-side wall formwork for concrete casting, the disk lock steel tubular scaffold was often utilized to bear the horizontal load, which was significantly different from the conditions under vertical load. In order to study the lateral bearing capacity and stiffness of disk lock steel tubular scaffold under horizontal load, 5 full-scale specimens were tested to observe the failure modes. The finite element models of disk lock steel tubular scaffold considering the semi-rigid nodes were established, and the parametric studies were conducted to study the effect of the standard spacing, lift height, cross bracing and tie member. The results show that the structure showed a tendency of overturn, and the standard and cross bracing was damaged under horizontal load. The cross bracing with the angle of 45° could increase the lateral bearing capacity and stiffness by about 35 %. The upper tie member could significantly increase the lateral bearing capacity and stiffness by about 50∼60 %. The ledger and diagonal brace tube bore some of the lateral load, which was different from the conditions under the vertical load. The optimal scaffold proposed in this paper could meet the requirements of lateral displacement limit as the lateral concrete casting pressure was 40kN/m<sup>2</sup>.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109290"},"PeriodicalIF":3.9,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139043","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

Numerical modelling of old-to-new concrete interface with surface indentation 考虑表面压痕的新旧混凝土界面数值模拟

IF 3.9 2区工程技术

Structures Pub Date : 2025-05-27 DOI: 10.1016/j.istruc.2025.109291

Olawale Ayinde , Erjun Wu , Guangdong Zhou , Qunfang Hu

{"title":"Numerical modelling of old-to-new concrete interface with surface indentation","authors":"Olawale Ayinde , Erjun Wu , Guangdong Zhou , Qunfang Hu","doi":"10.1016/j.istruc.2025.109291","DOIUrl":"10.1016/j.istruc.2025.109291","url":null,"abstract":"<div><div>The treatment of the interface in concrete to concrete strengthening and structural reinforcement plays a vital role in structural performance, influencing shear transfer, flexural behavior, and overall integrity. However, limited studies have explored the shear behavior of old-to-new concrete interfaces with varying surface indentation geometries and substrate roughness. To address this gap, this study developed a 3D finite element (FE) model to investigate the shear behavior of an old-new concrete interface with surface indentations, considering factors such as tooth angle, depth, and distribution. The model was validated by comparing its results with experimental results. The old-to-new concrete interface was modeled using a combined traction-separation and friction-coupled cohesive interface model approach. The numerical results, including load-slip relationship, interface shear capacity, cracking pattern, and failure mode, closely matched the experimental data, especially the interface shear capacity. Parametric studies were then conducted to examine the effects of varying surface indentation geometries and confining pressure on the interface's shear capacity. The findings revealed that surface indentations significantly affected the interface's stiffness, shear capacity, and slip behavior at maximum shear. A linear relationship between confining pressure and shear capacity was observed, with increasing confining pressure enhancing the shear capacity of the interface. The traction-separation model with friction penalty demonstrated high accuracy, with a maximum error of about 6 % across all test specimens. Based on these results, a shear stress-slip constitutive model was proposed for the mechanical behavior of old-to-new concrete interfaces with surface indentations under combined normal pressure and shear stress.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109291"},"PeriodicalIF":3.9,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139040","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 behavior of CFRP grid-reinforced shear walls enhanced with ECC: An experimental and theoretical investigation ECC加固CFRP格栅剪力墙的力学性能：试验与理论研究

IF 3.9 2区工程技术

Structures Pub Date : 2025-05-27 DOI: 10.1016/j.istruc.2025.109239

Zhen Huang , Bin Lin , Jie Shen , Lei Feng , Xiaorui Xie

{"title":"Mechanical behavior of CFRP grid-reinforced shear walls enhanced with ECC: An experimental and theoretical investigation","authors":"Zhen Huang , Bin Lin , Jie Shen , Lei Feng , Xiaorui Xie","doi":"10.1016/j.istruc.2025.109239","DOIUrl":"10.1016/j.istruc.2025.109239","url":null,"abstract":"<div><div>Premature concrete spalling at the base of shear walls reinforced with carbon fiber-reinforced polymer (CFRP) grids often limits the full utilization of the high-strength properties of CFRP, compromising structural performance. To overcome this limitation, engineered cementitious composites (ECC) were introduced into the plastic hinge regions in this study, aiming to effectively leverage the mechanical advantages of CFRP grids and enhance the shear capacity and ductility of shear walls. Six shear wall specimens were designed, fabricated, and tested under cyclic loading: one conventional reinforced concrete (RC) shear wall, one CFRP grid-reinforced wall, and four shear walls reinforced with CFRP grids and incorporating ECC in the plastic hinge zones. The failure modes, hysteresis and skeleton curves, energy dissipation capacity, stiffness degradation, and reinforcement strain were investigated. Experimental results showed that ECC-enhanced specimens exhibited significantly improved ductility, crack resistance and energy dissipation compared to specimens without ECC, along with reduced crack propagation angles and reduced stiffness degradation. To accurately predict the shear behavior of these enhanced shear walls, an improved Modified Compression Field Theory (MCFT) was developed by integrating the effects of CFRP grids and the fibers in ECC. Finally, a novel algorithm based on this enhanced MCFT was formulated to calculate the shear capacity of the shear walls, with theoretical predictions closely matching the experimental results.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"78 ","pages":"Article 109239"},"PeriodicalIF":3.9,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139643","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