高强新型外包钢-混凝土组合梁延性性能研究  

Study on ductility of high-strength steel-encased composite beam

作　　者：李业骏 石启印[1] 任冠宇[1] 张兆昌[1] 李艳蓉[1] 卢凡[1] Li Yejun Shi Qiyin Ren Guanyu Zhang Zhaochang Li Yanrong Lu Fan(Faculty of Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China)

机构地区：[1]江苏大学土木工程与力学学院,镇江212013

出　　处：《建筑结构》2017年第1期94-99,共6页Building Structure

摘　　要：为探讨高强新型外包钢-混凝土组合梁的延性性能,对5根高强新型外包钢-混凝土组合梁进行抗弯试验。根据试验结果对组合梁的位移延性比、曲率延性比与耗能进行分析,并通过弯矩曲率法对其进行全过程模拟,从曲率延性比的角度对混凝土强度、外包钢板屈服强度的影响规律进行定量模拟分析,为工程设计提供技术参考和理论指导。研究表明:弯矩曲率法可有效避免传统有限元模拟中存在的不收敛、计算效率较低等问题,且模拟结果与试验结果吻合良好,可用于高强新型外包钢-混凝土组合梁受力与延性性能的模拟研究;提高混凝土强度以及降低外包钢强度都有利于高强新型外包钢-混凝土组合梁延性的提高,且这种影响会随着混凝土强度以及钢板强度的提高而减小。In order to investigate the ductility of high-strength steel-encased composite beam, the bending test on five high-strength steel-encased composite beams was conducted. According to the result of the test, the deflection ductility ratio, curvature ductility ratio and energy dissipation capacity were analyzed. The effect of concrete strength and steel yield strength on the curvature ductility ratio was analyzed quantitatively by the analysis of the moment-curvature method, which provide technical reference and theoretical guidance for the practical engineering. The study results show that the non-convergence and [ow cMculation efficiency could be effectively avoided by the moment-curvature method instead of the finite element simulation. The moment-curvature method is proved to be the effective way to simulate the load behavior and ductility for its results agree well with the experimental data. The increase of concrete strength and the decrease of steel yield strength will lead to the improvement of the ductility and this effect would decrease with the increase of the concrete strength and steel yield strength.

关 键 词：高强新型外包钢-混凝土组合梁 弯矩曲率法 曲率延性比 位移延性比 耗能 相对受压区高度 

分 类 号：TU398[建筑科学—结构工程]