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高轴压比下小剪跨比剪力墙的抗震性能试验研究

Experimental study on seismic behavior of squat shear wall under high axial compression ratio

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通过5片不同轴压比下小剪跨比剪力墙构件的低周反复荷载试验,研究了高轴压比对小剪跨比剪力墙的破坏模式、受剪承载力、延性、刚度特征及耗能能力的影响,并对加载全过程中剪力墙腹板双向钢筋的受力情况及传力机制进行分析.研究结果表明:所有构件均发生了剪切破坏,并在高轴压力作用下发生了平面外的错动;高轴压比阻碍了裂缝的产生及发展,提高了构件的受剪承载力,但在构件达到峰值荷载后,强度和刚度退化剧烈,极限位移小,提高边缘约束构件配箍率可以有限地提高构件的变形能力、延性及耗能能力,但对破坏模式、传力机制的影响不大.轴压比对构件的传力机制有着显著的影响,当轴压比较小时,桁架作用明显,水平钢筋与竖向钢筋对受剪承载力的贡献相当,均能充分发挥作用;当轴压比较高时,拱作用明显,水平钢筋未能充分发挥作用,对受剪承载力的贡献有限,竖向钢筋主要对拱作用有贡献.
According to reversed low-cyclic loading tests of five reinforced concrete squat shear wall members with various axial compression ratio,the influence of high axial compression ratios on the failure mode,shear capacity,ductility,stiffness and energy dissipation of the squat shear wall were investigated,and the mechanical conditions and load transmission mechanism of the two-way web reinforcements for shear wall were analyzed.The results show that all members were failed by shear accompanying with out-of-plane sliding under high axial loads.In addition,high axial compression ratios resist the generation and development of cracks and improve the shear capacity of the members.However,when the members reached the peak load,the strength and stiffness of the members degrad sharply,and the ultimate displacement is small.The deformation capacity,ductility and energy dissipation of the members can be improved by increasing the stirrup ratio of the edge constraint members,but the failure mode and force transmission mechanism cannot be significantly influenced.While the axial compression ratio affects the force transmission mechanism of the members significantly.When the axial compression ratio is small,the truss action is dominant,so that both the horizontal and vertical reinforcements contribute to the shear capacity significantly and equally.When the axial compression ratio is high,the arch action becomes dominant,and the horizontal reinforcements cannot be fully used,contributing limitedly to the shear capacity,while the vertical reinforcements mainly contribute to arch actions.

squat shear wallhigh axial compression ratioshear capacityductilityseismic performancelow-cyclic loading test

金辰华、吴畅、潘钻峰、孟少平

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金陵科技学院建筑工程学院,南京 211169

东南大学土木工程学院,南京 211189

同济大学土木工程学院,上海 200092

小剪跨比剪力墙 高轴压比 受剪承载力 延性 抗震性能 低周反复荷载试验

国家自然科学基金青年基金江苏省自然科学基金青年基金中央高校基本科研业务费专项江苏省高等学校自然科学研究项目

52108119BK202003762242021R1008121KJB560005

2024

10.19701/j.jzjg.20212093

建筑结构
中国建筑设计研究院 亚太建设科技信息研究院 中国土木工程学会

建筑结构

CSTPCD北大核心
影响因子：0.723
ISSN：1002-848X
年,卷(期)：2024.54(12)