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砖墙轴心受压长期变形性能试验研究

, PP. 88-94

Keywords: 砖墙,混凝土,预压力,长期变形,压应变

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Abstract:

在内框架房屋中,砖墙和混凝土柱共同作为竖向构件承受竖向荷载。混凝土柱和砖墙在承受竖向荷载的过程中要产生短期变形和徐变变形。变形不一致会引起内力重分布,构件的安全储备会发生相应变化。关于混凝土柱在荷载长期作用下的变形研究较多,而关于砖墙在荷载长期作用下的变形研究未见系统报道。本文通过张拉螺杆对砖墙预压,开展了高宽比为1.1,轴压比为0.15、0.25、0.35的3片砖墙在预压力作用下的长期变形试验。考察了竖向压力随时间推移而减小的情况和竖向压应变随时间的发展情况。发现对螺杆张拉25d左右竖向压应力和竖向压应变基本稳定。拟合得到了施加预压力26d时不同轴压比σ0/fmm下的砖墙竖向压应变计算公式。对比分析了不同实际轴压比下C30混凝土棱柱体与本文砖墙的长期竖向压应变预估值εcl及短期荷载作用下峰值应力对应的压应变,发现相同轴压比时二者长期变形接近,砖墙短期荷载作用下峰值应力对应的压应变远大于C30混凝土棱柱体。

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