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（1 河南大學(xué)土木建筑學(xué)院 開封 475004； 2 西安建筑科技大學(xué) 710055）
【提要】 利用鋼筋混凝土軟化桁架模型分析了小跨高比連梁的受剪承載力性能。對比試驗結(jié)果可知，軟化桁架模型可以用于小跨高比連梁的整個加載歷程分析，分析結(jié)果與試驗現(xiàn)象一致。此外，依據(jù)箍筋和混凝土相對貢獻(xiàn)的大小，可以清楚地識別小跨高比連梁的三種剪切破壞模式（少筋、適筋、超筋破壞）。對于每一種破壞模式，給出了受剪承載力計算公式。計算結(jié)果與試驗結(jié)果符合良好。給出了小跨高比連梁設(shè)計方法。
【關(guān)鍵詞】 小跨高比連梁 受剪承載力 破壞模式 軟化桁架模型 全過程分析
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