L形配钢型钢混凝土矩形柱偏压力学性能研究  

Research on Mechanical Properties of L-Shaped Steel-Reinforced Concrete Rectangular Columns Under Eccentric Compression

作　　者：吴琛 张颖 项洪 麻胜兰 姜绍飞[2] WU Chen;ZHANG Ying;XIANG Hong;MA Shenglan;JIANG Shaofei(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fuzhou 350118,China;School of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福建省土木工程新技术与信息化重点实验室,福州350118 [2]福州大学土木工程学院,福州350108

出　　处：《工业建筑》2023年第7期116-123,179,共9页Industrial Construction

基　　金：福建省高校产学合作项目(2022H6032);福州市科技计划项目(2021-P-048)。

摘　　要：L形配钢型钢混凝土(SRC)矩形柱用作高层建筑角柱时,可避免T形配钢SRC柱梁柱型钢不连续造成的传力不直接和应力集中问题。为揭示L形配钢SRC柱偏压力学性能,设计了不同荷载偏心率、长细比和不同配钢形式的5根L形配钢SRC矩形柱和1根T形配钢SRC矩形柱并对其开展偏心受压试验。结果表明:L形型钢在混凝土的不均匀约束作用下,试件裂缝双向不对称发展,且在同一截面高度处,L形配钢SRC柱拉压区的钢筋和型钢不同时屈服;但型钢不对称并没有明显降低试件的承载力和延性。在试验研究基础上建立有限元模型,拓展分析荷载偏心率、长细比、腹板偏心对L形配钢SRC柱偏压力学性能的影响。模型分析表明:L形配钢SRC柱的拉压区界限呈斜直线,但因斜率较小且试件承载力与T形配钢方式无明显差异,在构件截面设计时相对受压区高度可按直线进行简化;分析多种工况的有限元模型,建议取荷载偏心率0.45作为构件设计时大小偏压的初步判别标准。When L-shaped steel-reinforced concrete(SRC)rectangular columns are applied as corner columns in high-rise buildings,the problems of indirect force transmission and stress concentration caused by the discontinuity of T-shaped steel reinforced concrete columns can be avoided.In order to reveal the mechanical properties of L-shaped SRC columns under eccentric compression,five L-shaped SRC rectangular columns and one T-shaped SRC rectangular column with different load eccentricity,slenderness ratio and different steel distribution,respectively.All these specimens were tested under eccentric compression.The results showed that L-shaped steel developed crack asymmetrically under the non-uniform constraint of concrete;at the same cross-section height,the reinforcement and steel in the tension and compression zone of L-shaped steel SRC column did not yield concurrently.However,the steel asymmetry does not significantly reduce the bearing capacity and ductility of the specimens.Based on the experimental study,a finite element model was established to analyze the effects of eccentricity,slenderness ratio and web eccentricity on the mechanical properties of L-shaped steel SRC columns under eccentric compression.The model analysis showed that the boundary of the tension and compression zones of L-shaped steel SRC columns was an oblique line.However,because the slope was small and the bearing capacity of the specimen was not significantly different from that of T-shaped steel,the relative height of the compression zone could be simplified as a straight line in the design of the component section.Based on the analysis of finite element model under various working conditions,the paper suggested that the value of load eccentricity about 0.45 should be the preliminary criterion for the size bias in the design of component.

关 键 词：L形配钢 型钢混凝土柱 偏压力学性能 长细比 腹板偏心 

分 类 号：TU398.9[建筑科学—结构工程]