摘要
民用建筑中的剪力墙高宽比通常大于1,而高温气冷堆内的钢筋混凝土墙的高宽比一般小于1。为了研究低矮钢筋混凝土墙的失效机理,本文对平面内和平面外竖向荷载下,高宽比分别为0.33、0.5和1的12片低矮钢筋混凝土墙进行了水平承载力试验,对提出的墙水平承载力计算公式进行了验证。试验表明:低矮钢筋混凝土墙的破坏方式与一般的钢筋混凝土梁和柱有很大区别。在轴力和水平剪力作用下,低矮钢筋混凝土墙的破坏为斜开裂-剪摩擦机制;对于高度相同的墙,高宽比越小,剪切破坏时沿墙底剪摩擦段的长度越长;墙高宽比、轴压比和配筋率均对墙的水平承载力有影响;平面外竖向荷载下墙的水平承载力小于平面内竖向荷载下墙的水平承载力,墙水平承载力与平面外弯矩近似符合1/4圆关系。本文公式计算结果与试验结果符合良好。
In general,the aspect ratio of shear walls in civil buildings is greater than 1,whereas that of reinforced concrete walls in high-temperature gas-cooled reactors is less than 1.Twelve reinforced concrete wall specimens with aspect ratios of 0.33,0.35,and 1 subjected to in-plane and out-plane loading are tested to explore the lateral carrying capacity and failure mechanism of low-rise reinforcement concrete walls.The equation for predicting lateral carrying capacity is verified on the basis of the test results.This work reveals that in contrast to regular reinforced concrete beams and columns under axial compressive and monotonic horizontal loads,low-rise reinforced concrete walls fail through diagonal cracking combined with the shear friction mechanism.For walls of the same height,the lower the aspect ratio,the longer the shear-friction portion along the bottom of the wall at the critical state.Lateral carrying capacity is related to the aspect,axial compression,and reinforcement ratios.The lateral carrying capacity of a low-rise reinforced concrete wall subjected to out-of-plane vertical loading is lower than that of a low-rise reinforced concrete wall subjected to the same in-plane vertical loading,and the horizontal bearing capacity of the wall and out-of-plane bending moment approximately conform to the 1/4 circle relationship.The equation provided in this work predicts the horizontal bearing capacity of low-rise concrete walls well.The calculated results of the formula given in this paper are in good agreement with the experimental results.
作者
孙运轮
王友刚
郭书恒
贡金鑫
SUN Yunlun;WANG Yougang;GUO Shuheng;GONG Jinxin(Chinergy Co.,Ltd.,Beijing 100193,China;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2023年第5期823-830,共8页
Journal of Harbin Engineering University
基金
国家科技重大专项(2018ZX06902016)。
关键词
核电厂房
低矮钢筋混凝土墙
水平承载力
平面外弯矩
高宽比
轴压比
配筋率
塑性极限理论
nuclear power plant structures
low-rise reinforced concrete walls
lateral carrying capacity
out-of-plane bending moment
aspect ratio
axial compression ratio
reinforcement ratio
plastic limit theory
