负弯矩区腹板开洞钢-混凝土组合梁承载力试验研究与理论分析  

Experimental study and theoretical analysis on load carrying capacity of steel-concrete composite beams with web openings under negative moment

作　　者：陈涛[1] 李华[1] 顾祥林[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《建筑结构学报》2011年第4期63-71,共9页Journal of Building Structures

基　　金：教育部留学回国人员科研启动基金项目(教外司留[2010]1174)

摘　　要：通过外挑钢-混凝土组合梁的单调加载试验和有限元分析,研究负弯矩区腹板开洞对其受力性能的影响,并基于弯剪承载力相互作用的准则,提出承载力理论计算方法。结果表明:截面开洞显著降低了组合梁的承载能力和刚度;最终破坏形式为洞口上方混凝土板的剪切破坏;组合梁承载能力随着截面削弱的加大而降低;洞口补强板可减轻洞口区域应力集中,进而提高组合梁的承载力;承载力随着洞口中心线与支座距离减小(即弯剪比的增大)而减小。应用建议的负弯矩区腹板开洞组合梁承载力计算方法得到的承载力计算结果与试验及有限元分析结果吻合较好。Monotonic loading tests and finite element analyses were conducted for cantilever composite beams with web opening under negative moment.The results indicate that the load carrying capacity and stiffness decreases with the area reduction of the composite beam web.The failure mode is the shear failure of concrete slab upon the opening of the web.The load carrying capacity decreases with the enlarging of the opening area.The horizontal stiffening steel plates around the opening can lessen the stress concentration and increase the load carrying capacity.And the load carrying capacity decreases with the increase of moment shear ratio that denotes less distance between the opening and the support.Theoretical analyses on load carrying capacity were carried out based on moment shear interaction principle.Theoretical calculation method was applied to the parametric analysis.The calculated results of load carrying capacities were in good consistency with the results of tests and the numerical analysis.

关 键 词：腹板开洞组合梁 负弯矩区 单调加载试验 有限元分析 承载力 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1