Journal of Structural Engineering-asce最新文献

{"title":"Response of Full-Scale Slender Masonry Walls with Conventional and NSM Steel Reinforcement Subjected to Axial and Out-of-Plane Loads","authors":"Adrien Sparling, Dan Palermo","doi":"10.1061/jsendh.steng-11364","DOIUrl":"https://doi.org/10.1061/jsendh.steng-11364","url":null,"abstract":"The response of four slender reinforced masonry walls to combined axial and out-of-plane loading is presented herein. The testing series compares the response of walls with conventionally embedded steel reinforcing bars to those with near-surface-mounted (NSM) steel reinforcement. Each wall was constructed from 190 mm wide hollow concrete masonry units to a length of 1,200 mm and a height of 7,800 mm, with a gross reinforcement ratio of 0.26%. Each wall was simply supported and loaded cyclically in the out-of-plane direction within the elastic response range (up to 90% of the nominal yield strain of the reinforcing bars) with the applied axial loading ranging from 0 to 250 kN. The moment resistance of each wall increased with increasing applied axial load; however, the out-of-plane load resistance of the conventionally reinforced walls decreased due to secondary moment effects. The stiffer walls with NSM reinforcement exhibited increasing out-of-plane load resistance due to the increasing moment resistance and to the lower displacement of the system which reduced secondary moment effects. The final loading cycle of each wall displaced the walls to at least twice the yield displacement while maintaining an imposed axial load of 60 kN (for both conventionally reinforced walls and one of the walls with NSM reinforcement) or 120 kN (for one of the walls with NSM reinforcement). Comparing the response of the walls in their final loading cycles, the conventionally reinforced and NSM reinforced walls had similar maximum moment resistance; however, the average out-of-plane load resistance at the yield point of the walls with NSM reinforcement was 180% of the conventionally reinforced walls. This experimental series represents the first full-scale tests of very slender concrete block masonry walls reinforced with NSM steel bars.","PeriodicalId":17068,"journal":{"name":"Journal of Structural Engineering-asce","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136367732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural Identification of a 52-Story High-Rise in Downtown Los Angeles Based on Short-Term Wind Vibration Measurements","authors":"Mohamed H. Abdelbarr, Monica D. Kohler, Sami F. Masri","doi":"10.1061/jsendh.steng-11111","DOIUrl":"https://doi.org/10.1061/jsendh.steng-11111","url":null,"abstract":"This paper presents a case study of a realistic application and evaluation of a promising structural health monitoring approach that exploits some topological features of building-like structures to develop a reduced-order, reduced-complexity, not-necessarily-linear, substructure model. The approach not only reliably detects the occurrence of anomalous features that can reflect incipient damage and deterioration but also provides the locations of the structure’s regions where a single or multiple changes have been detected. The target structure used in this study is a 52-story building in Los Angeles that is instrumented with a relatively dense sensor array and is being continuously monitored through the efforts of the community seismic network (CSN). Two qualitatively different system identification approaches (global and substructuring) are applied to the large data set of ambient acceleration measurements produced by a strong wind event (“Santa Ana winds”) to identify the dominant modal characteristics of the building. The results are shown to match the corresponding results from a high-resolution computational model of the building based on a widely used structural analysis software package (ETABS) developed by Computers and Structures, Inc. The main contribution of this study is to demonstrate the practical feasibility of the proposed substructuring approach with a high-order system using both wind and low-amplitude ambient vibration measurements. The approach also assesses the accuracy and reliability of the estimates of the dominant modal features of the structure to subsequently provide a probabilistic measure of confidence in the extent and location of changes if an anomaly is detected. Due to the minimal computational resources needed to implement the proposed substructuring approach, it is efficient for near-real-time applications where important structures need to be continuously monitored for sustainability as well as resiliency requirements. The method is applicable to linear, nonlinear nonhysteretic, and hysteretic systems, with no restriction on the source of the signal for identification purposes.","PeriodicalId":17068,"journal":{"name":"Journal of Structural Engineering-asce","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134902295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New Analytical Analysis-Oriented Stress-Strain Model for FRP-and-Steel Confined Concrete","authors":"Diogo Zignago, Michele Barbato","doi":"10.1061/jsendh.steng-11634","DOIUrl":"https://doi.org/10.1061/jsendh.steng-11634","url":null,"abstract":"Application of fiber-reinforced polymer (FRP) composites in the strengthening of reinforced concrete (RC) structures has become an increasingly accepted engineering practice. In particular, the use of externally bonded FRP wraps as a confining material for concrete can enhance both the compressive strength and the ultimate strain of concrete, making it suitable for strengthening and/or seismic retrofit of existing RC columns. This paper focuses on a recently developed analysis-oriented iterative FRP-and-steel confinement model for concrete and proposes a new optimization procedure to obtain an analytical expression for the corresponding monotonic envelope, reduce the associated computational cost, and increase the corresponding numerical robustness. Several analytical functions were evaluated in terms of their capability to fit the iteratively-generated stress-strain monotonic envelope for confined concrete. The newly proposed analytical formulation of the confined concrete stress-strain model was compared with the original iterative formulation in terms of computational cost for two examples of nonlinear seismic response analyses for: (1) an experimentally-tested concrete-filled FRP tube bridge column of a two-column bridge pier; and (2) a five-span bridge structure with FRP-retrofitted RC piers. It is found that the use of the newly proposed optimization-based analytical monotonic envelope can reduce by more than 30% the computational time associated with the original iteration-based monotonic envelope with negligible changes in the structural response prediction at both global and local levels.","PeriodicalId":17068,"journal":{"name":"Journal of Structural Engineering-asce","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136367734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Study on the Behavior of a Novel Stiffened Hexagonal CFDST Stub Column under Axial Load","authors":"Le Shen, Bo Yang, M. Ding, Chen Feng, S. Alqawzai, M. Elchalakani, Kang Chen","doi":"10.1061/(ASCE)ST.1943-541X.0003198","DOIUrl":"https://doi.org/10.1061/(ASCE)ST.1943-541X.0003198","url":null,"abstract":"AbstractA concrete-filled double skin tube (CFDST) consists of an outer steel tube, an inner steel tube, and the space between them filled with concrete. Existing studies have shown that the buckli...","PeriodicalId":17068,"journal":{"name":"Journal of Structural Engineering-asce","volume":"10 1","pages":"04021231"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78529107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexural Behavior of High-Strength Rectangular Concrete-Filled Steel Tube Members","authors":"Ying Wang, Hang Lin, Z. Lai, Dong Li, Weisheng Zhou, Xiaoqiang Yang","doi":"10.1061/(ASCE)ST.1943-541X.0003192","DOIUrl":"https://doi.org/10.1061/(ASCE)ST.1943-541X.0003192","url":null,"abstract":"AbstractThis study experimentally and numerically investigates the flexural behavior of high-strength rectangular concrete-filled steel tube (CFST) members. An experimental database including 30 fl...","PeriodicalId":17068,"journal":{"name":"Journal of Structural Engineering-asce","volume":"18 1","pages":"04021230"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81696344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interpretable XGBoost-SHAP Machine-Learning Model for Shear Strength Prediction of Squat RC Walls","authors":"D. Feng, Wen-Jie Wang, N Time, E. Taciroglu","doi":"10.1061/(ASCE)ST.1943-541X.0003115","DOIUrl":"https://doi.org/10.1061/(ASCE)ST.1943-541X.0003115","url":null,"abstract":"AbstractRC shear walls are commonly used as lateral load-resisting elements in seismic regions, and the estimation of their shear strengths can become simultaneously design-critical and complex whe...","PeriodicalId":17068,"journal":{"name":"Journal of Structural Engineering-asce","volume":"10 1","pages":"04021173"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75143562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FEA Strategy for Realistic Simulation of Buckling-Restrained Braces","authors":"D. Court-Patience, M. Garnich","doi":"10.1061/(ASCE)ST.1943-541X.0003033","DOIUrl":"https://doi.org/10.1061/(ASCE)ST.1943-541X.0003033","url":null,"abstract":"AbstractBuckling-restrained braces (BRBs) are seismic devices that provide structures such as buildings and bridges with lateral support, dissipating more energy than traditional bracing. Large-sca...","PeriodicalId":17068,"journal":{"name":"Journal of Structural Engineering-asce","volume":"70 1","pages":"04021186"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74494003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simplified Methods for Progressive Collapse Assessment of Frame Structures","authors":"P. Stylianidis, D. Nethercot","doi":"10.1061/(ASCE)ST.1943-541X.0003190","DOIUrl":"https://doi.org/10.1061/(ASCE)ST.1943-541X.0003190","url":null,"abstract":"AbstractThe Imperial College Robustness Assessment Framework is a methodology—based upon application of the alternate load path concept—for quantitatively comparing the performance of different str...","PeriodicalId":17068,"journal":{"name":"Journal of Structural Engineering-asce","volume":"15 1","pages":"04021183"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86591961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uniform Strip Model of Steel Plate Shear Walls with Different Plate Thicknesses","authors":"Weifeng Tian, Yousufu Ma, J. Berman","doi":"10.1061/(ASCE)ST.1943-541X.0003134","DOIUrl":"https://doi.org/10.1061/(ASCE)ST.1943-541X.0003134","url":null,"abstract":"AbstractThe strip model, which is currently the most commonly used simplified analytical model for steel plate shear walls (SPSWs), neglects the compressive stiffness and resistance of the infill p...","PeriodicalId":17068,"journal":{"name":"Journal of Structural Engineering-asce","volume":"40 1","pages":"04021172"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76225973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Steel Braces on Robustness of Steel Frames against Progressive Collapse","authors":"Kai Qian, Xi-Qian Lan, Zhi Li, F. Fu","doi":"10.1061/(ASCE)ST.1943-541X.0003161","DOIUrl":"https://doi.org/10.1061/(ASCE)ST.1943-541X.0003161","url":null,"abstract":"AbstractExternal installation of steel braces is an effective approach to increase the lateral load resistance of steel moment-resisting frames. However, the effects of existence of steel braces on...","PeriodicalId":17068,"journal":{"name":"Journal of Structural Engineering-asce","volume":"77 1","pages":"04021180"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77761037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}