（1 河南大学土木建筑学院 开封 475004； 2 西安建筑科技大学 710055）
【提要】 利用钢筋混凝土软化桁架模型分析了小跨高比连梁的受剪承载力性能。对比试验结果可知，软化桁架模型可以用于小跨高比连梁的整个加载历程分析，分析结果与试验现象一致。此外，依据箍筋和混凝土相对贡献的大小，可以清楚地识别小跨高比连梁的三种剪切破坏模式（少筋、适筋、超筋破坏）。对于每一种破坏模式，给出了受剪承载力计算公式。计算结果与试验结果符合良好。给出了小跨高比连梁设计方法。
【关键词】 小跨高比连梁 受剪承载力 破坏模式 软化桁架模型 全过程分析
Shear Carrying Capacity Analysis of Coupling Beams with Small Aspect Ratio/Liu Qingshan１, Liang Xingwen２(1 School of Civil Engineering and Architecture,Henan Univ.,Kaifeng 475004,China; 2 Xi'an University of Architecture & Technology, Xi'an 710055, China)
Abstract:The shear strength and behavior of coupling beams with small spantodepth ratio are analyzed with softened truss model for membrane element of reinforcement concrete. Compared with experimental results, it is shown that softened truss model can be applied throughout the loading history. Analytical results are in good agreement with experimental results. Furthermore, it is shown that three different failure modes (underreinforcement, balanced and overreinforcement) can be clearly identified, depending on the relative contribution of stirrup to that of the concrete. For each failure mode, an explicit formula is derived for the prediction of shear strength. The calculated value of shear strength is almost equal to experimental value. A simple procedure is recommended for the design of deep reinforced concrete coupling beams.
Keywords:coupling beams;small spantodepth ratio; shear carrying capacity; failu
re modes; softened truss model;loading history analysis