Structures最新文献_第9页

Field pullout test and anchorage length calculation for external anchorage of GFRP anti-floating anchors GFRP 抗浮锚杆外部锚固的现场拉拔试验和锚固长度计算

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-24 DOI: 10.1016/j.istruc.2024.107636

{"title":"Field pullout test and anchorage length calculation for external anchorage of GFRP anti-floating anchors","authors":"","doi":"10.1016/j.istruc.2024.107636","DOIUrl":"10.1016/j.istruc.2024.107636","url":null,"abstract":"<div><div>Field pullout destructive tests of GFRP anti-floating anchors with different anchorage lengths and different anchorage forms are carried out on inverted foundation slabs. Explore the damage patterns and anchorage mechanisms of bent anchors, straight anchors and GFRP anchors with different bending configurations in relation to the concrete foundation slab. Calculate the reasonable anchorage length of anti-floating anchors. The test results show that the straight line anchor rod and bent anchor rod are mainly damaged by sliding. The displacement of anchor rod body decreases with the increase of anchorage length, bending radius and bending length. The bending treatment of anchor rods reduces the pullout bearing capacity of GFRP anti-floating anchors, but it can significantly reduce the rod displacement. The longer the length of the bent section of the anchor rod body and the larger the bending radius, the lower the strength utilization of the anchor rod body. Through the calculation of the test results of different anchorage length anti-floating anchor rods, it is found that the current calculation method for the basic anchorage length of anchor rods is too conservative. For the actual anti-floating project, a more reasonable anchorage length calculation method is proposed, and the reasonable anchorage length of anchor rods for this test condition is 370–530 mm.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538847","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 study of an innovative timber-concrete composite deck with a demountable dry-dry notched connection system 采用可拆卸干-干缺口连接系统的创新型木材-混凝土复合甲板的实验研究

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-24 DOI: 10.1016/j.istruc.2024.107355

{"title":"Experimental study of an innovative timber-concrete composite deck with a demountable dry-dry notched connection system","authors":"","doi":"10.1016/j.istruc.2024.107355","DOIUrl":"10.1016/j.istruc.2024.107355","url":null,"abstract":"<div><div>This paper presents an experimental investigation of an innovative Timber-Concrete Composite (TCC) deck with a dry-dry demountable connection system. The connections were made as notches, and the composite deck was assembled from a CNC-cut timber element and two prefabricated concrete panels joined at mid-span. The longitudinal joint between the concrete elements facilitated pre-activation of the deck, which has several advantages, including potential for pre-camber and a diminution of displacements induced by early-age shrinkage. All connections in the new deck were designed for disassembly to ease reuse of the materials at end-of-service-life and the environmental impact was reduced by adopting a carbon-minimized concrete mix design which resulted in semi-low strengths. The new deck system has been experimentally investigated through 14 four-point bending tests, comprising seven specimens designs with varying notch width, number of fasteners, and intended imperfections at selected notch mouths. The performance of the deck, in terms of connection efficiency and displacement capacity (ductility), was assessed and compared with 35 tests from the literature on existing wet-dry solutions. The findings revealed that the behavior of the new dry-dry deck system is comparable with existing wet-dry solutions. Most of the connections failed from concrete failures because of the low concrete strength, and when combined with a fastener, these failures exhibited a remarkable ductile local behavior, leading to elevated levels of global displacement capacity. The experimental study demonstrated a promising potential for improved structural behavior despite being more climate friendly.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance of hinge joints in hollow-core slab bridges reinforced with iron-based shape memory alloy U-bars 用铁基形状记忆合金 U 型杆加固的空心板桥铰缝的性能

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-23 DOI: 10.1016/j.istruc.2024.107613

{"title":"Performance of hinge joints in hollow-core slab bridges reinforced with iron-based shape memory alloy U-bars","authors":"","doi":"10.1016/j.istruc.2024.107613","DOIUrl":"10.1016/j.istruc.2024.107613","url":null,"abstract":"<div><div>The mechanical behavior of hinge joints has an important influence on the hollow-core slab bridges. However, hinge joints are prone to cracking. This study proposed a new hinge joint reinforced by locally prestressed iron-based shape memory alloy (Fe-SMA) U-bars for the new hollow-core slab bridge. To verify the effectiveness of this hinge joint, six test specimens were prepared, encompassing two spans (10 m and 20 m), and three working conditions (nonactivation, activation before cracking, and repair and activation after cracking). The load transfer mechanism under flexural-shear load was investigated, and the validity was verified using a proposed simplified analytical model. The results indicated that the failure mode of the new hinge joint under flexural-shear load can be divided into three stages. The new hinge joint can effectively apply local prestressing by heating activation of the Fe-SMA U-bars, thus increasing the crack penetration load. In addition, the damaged new hinge joints can be repaired and further reinforced by pressure injection of adhesive and heating activation of the Fe-SMA U-bars. Load transfer is affected by the development of cracks, and the ultimate load of the new hinge joint is controlled by the splitting tensile strength of the concrete in the hinge joint.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538665","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

Data-driven prediction method for flexural performance of ECC composite sandwich panels 数据驱动的 ECC 复合夹芯板弯曲性能预测方法

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-23 DOI: 10.1016/j.istruc.2024.107524

{"title":"Data-driven prediction method for flexural performance of ECC composite sandwich panels","authors":"","doi":"10.1016/j.istruc.2024.107524","DOIUrl":"10.1016/j.istruc.2024.107524","url":null,"abstract":"<div><div>To address the inadequate load-carrying capacity and ductility of precast concrete sandwich panels (PCSPs), as well as their inability to meet the current trend of lightweight and high-strength structures, this study proposes a novel engineered cementitious composite (ECC) composite sandwich panel (ESP) by applying ECC to the outer wythe. Existing design methods are unable to accurately quantify either the composite action between the inner and outer wythes or fully consider the complex design parameters when predicting the flexural performance of this new type of sandwich panel. In response, two normal concrete sandwich panels (NSPs) and two ESPs were first tested to reveal their flexural performance using a four-point bending test. Test results indicate that the application of ECC to the outer wythe can significantly improve the flexural performance of the sandwich panel, especially in terms of crack resistance and ductility. Subsequently, finite element parametric analysis demonstrated the impact of connector arrangement on the flexural performance, and design formulas for the degree of composite action (DCA) based on connector arrangement were proposed. Finally, a data-driven prediction model integrating experiments, finite element analysis, and neural networks was developed to accurately predict the flexural carrying capacity and ductility of the sandwich panel. By utilizing gene expression programming, the explicit function can be derived for the prediction model, which provides practical guidance for engineering applications.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538663","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

Optimal design of spatial structures by a novel meta-heuristic algorithm: Sound energy optimizer 利用新型元启发式算法优化空间结构设计：声能优化器

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-23 DOI: 10.1016/j.istruc.2024.107570

{"title":"Optimal design of spatial structures by a novel meta-heuristic algorithm: Sound energy optimizer","authors":"","doi":"10.1016/j.istruc.2024.107570","DOIUrl":"10.1016/j.istruc.2024.107570","url":null,"abstract":"<div><div>Sound signals are used by various species of living creaters to commonicate with each other. Scientific experiments have demonstrated that sound energy can travel through media and cause the receiver objects to vibrate or move. The present work simulates such a phenomenon in development of a new meta-heuristic algorithm called: Sound Energy Optimizer (SEO). Concerning physical rules, SEO leverages natural or ambient sounds for optimization. SEO utilizes a tunable virtual machine to control the decaying pattern of the sound energy in a medium representing the search space. Performance of the proposed algorithm is first evaluated on unconstrained optimization of some mathematical test functions. Then, a variety of pin-jointed structural problems are optimized including space tower, double-layer grid, barrel vault, helipad structure and power transmission towers. In this set, performance evaluation is done not only against the previous works but also by running SEO versus eight recent meta-heuristics under fair comparison conditions. New quantitative indices are introduced and traced as well as the common statistical measures and convergence curves. The results demonstrate competitive performance of SEO versus recent meta-heuristics in the discrete and continuous design of spatial structures.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538664","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 numerical investigations on flexural behavior of apex joints in aluminum alloy portal frames 铝合金门式框架顶点接头抗弯行为的实验和数值研究

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-23 DOI: 10.1016/j.istruc.2024.107596

{"title":"Experimental and numerical investigations on flexural behavior of apex joints in aluminum alloy portal frames","authors":"","doi":"10.1016/j.istruc.2024.107596","DOIUrl":"10.1016/j.istruc.2024.107596","url":null,"abstract":"<div><div>Aluminum alloy portal frames (AAPFs) find extensive applications in lightweight and temporary structures owing to their light weight, excellent corrosion resistance, and ease of installation and disassembly. Existing design equations for cold-formed steel portal frame (CFSPF) apex joints are not applicable to AAPF apex joints due to significant differences in structural configuration. Therefore, dedicated research is needed to develop design guidelines for AAPF apex joints. Consequently, this paper conducts experimental and numerical investigations on flexural behavior of AAPF apex joints. Initially, bending tests are conducted on three AAPF apex joints, revealing failure modes including clamping plate buckling and beam failure. The flexural behavior of apex joints throughout the entire process is analyzed based on moment-rotation curves and moment-strain curves. Subsequently, finite element (FE) models are established and validated by comparing the FE results with the experimental results. Following this validation, parameter analysis is conducted considering the influence of beam cross-sectional dimensions, clamping plate dimensions, bolt dimensions, and layout. Finally, based on theoretical and numerical investigation, the calculation equation for the flexural capacity of AAPF joints is derived, offering valuable reference for engineering design.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539014","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

Identification of possible structural defects on piled foundations supporting structures on permafrost soils: Norilsk’s Palace of Culture case study 识别永久冻土上支撑结构的桩基可能存在的结构缺陷：诺里尔斯克文化宫案例研究

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-23 DOI: 10.1016/j.istruc.2024.107600

引用次数: 0

Three-dimensional high fidelity mesoscale rapid modelling algorithm for concrete 混凝土三维高保真中尺度快速建模算法

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-23 DOI: 10.1016/j.istruc.2024.107561

引用次数: 0

Seismic adaptive control of building structures using active friction tuned mass damper 利用主动摩擦调谐质量阻尼器对建筑结构进行抗震自适应控制

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-23 DOI: 10.1016/j.istruc.2024.107575

引用次数: 0

Bayesian model averaging and Bayesian inference-based probabilistic inversion method for arch dam zonal material parameters 基于贝叶斯模型平均和贝叶斯推理的拱坝分区材料参数概率反演方法

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-23 DOI: 10.1016/j.istruc.2024.107605

{"title":"Bayesian model averaging and Bayesian inference-based probabilistic inversion method for arch dam zonal material parameters","authors":"","doi":"10.1016/j.istruc.2024.107605","DOIUrl":"10.1016/j.istruc.2024.107605","url":null,"abstract":"<div><div>Inversion analysis based on structural monitoring data is an important part of evaluating the working behaviour of structures. In this paper, a probabilistic inversion method for the elastic modulus of concrete in arch dams based on Bayesian model averaging (BMA) and Bayesian inference is proposed. According to the measured displacement data of an arch dam project, the influence of the separation accuracy of water pressure component, the inversion method and the selection of displacement measuring points on the inversion results of the elastic modulus of the dam body is studied. Example analysis results show that the accuracy of the multi-measurement point displacement and hydraulic pressure component separation model based on BMA-HST (Hydrostatic-seasonal-time) is at least 18.97 % higher than that of the single measurement point, and the relative error of the elastic modulus value of the multi-measurement point zonal inversion based on the Polynomial chaos-Kriging (PCK) proxy model and the Bayesian inference is only 6 % at the maximum, which indicates that the inversion model described in this paper is able to realize the high-precision inversion analysis of the material parameters of the zonal analysis of concrete dams at a relatively low computational cost.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538729","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