矩形孔烧结页岩砖砌体短柱偏心受压性能试验

Eccentric compression test of rectangular hole sintered shale brick masonry short columns

偏心受压是砖砌体工程中常见的受力形式,是反应构件在偏心受力状态下耗能能力的重要指标。采用2种强度等级的砂浆和4种偏心率砌筑8组短柱试件,研究构件中部截面的平均应变变化情况、试件破坏形态和偏心承载力。结果表明,矩形孔烧结页岩砖砌体短柱试件截面的平均应变能较好地符合平截面假设,偏心率的增大会削弱砌体短柱的偏心承载力,但破坏荷载试验值仍符合规范要求,并有较高的强度储备。对试验数据拟合回归所提出的偏心影响系数计算公式可为相关规程的修订和完善提供参考。

Eccentric compression is a common form of stress in brick masonry engineering and an important indicator of ener- gy dissipation capacity of reaction components under eccentric stress. Two kinds of mortar strength and four kinds of eccentricity are used to construct eight groups of short column specimens. The average strain change of the middle section of the member,the failure morphology and the eccentric bearing capacity of the specimen were studied. The results show that the average strain energy of the cross section of the specimen conforms well to the assumption of flat section. The increase of eccentricity will weaken the eccentric bearing capacity of the short columns of masonry but the test values of failure load are still much higher than those of the normalized ones,strength reserves. The calculation formula of the eccentric influence coefficient proposed by the fitting regres- sion of the test data provides references for the revision and perfection of the relevant regulations.