中文摘要：

钢板砖砌体组合结构在既有砖混房屋中进行大空间改造时,组合托梁上部的墙体存在拱效应,使得托梁与上部墙体之间共同工作。为了研究此类组合墙梁的工作机理、破坏形态、承载力、控制截面的应变分布以及变形,对5根钢板砖砌体组合墙梁进行了集中荷载作用下的试验研究与分析,并考虑了上部墙体高跨比、组合托梁高跨比和钢板厚度的参数影响。主要的研究结果表明钢板砖砌体组合墙梁的破坏始于加载点与支座连线部分的砌体;钢板沿截面高度的应变分布符合平截面假定;上部墙体的高跨比直接影响墙体的破坏形态、钢板发生空鼓时的荷载和构件的极限荷载;合理的墙体高度有利于组合作用的形成,并且过高的墙体反而会降低极限荷载。最后给出了上部墙体高跨比的合理取值范围,同时建议钢板砖砌体组合托梁的抗弯刚度相对上部墙体平面内刚度的系数应至少大于79。

英文摘要：

When steel plate-masonry composite structure used in the existing masonry structure with load bearing walls is removed for a large space,composite action should be considered between the beam and the supported masonry wall due to the arch effect formed in the supported wall.In order to investigate the working mechanism,failure mode,and load-carrying capacity,strain distribution in critical sections and mid-span defcection of this type of composite wall-beam,five steel plate-masonry wall-beams were tested under concentrated loads and analyzed,which considered variables of height-span-ratio of supported masonry wall,height-span-ratio of composite beam and thickness of steel plate.The results show that steel plate-masonry composite wall-beam starts failure from the masonry located at the line between loading point and supporting point;strain distribution of steel plate along section height meets the plane section assumption;the height-span-ratio of supported wall can directly influence the failure mode of masonry wall,buckling load corresponding to steel plate experiencing local buckling and ultimate load of tested specimens;the reasonable height of supported masonry wall is beneficial to the formation of composite action between supported masonry wall and composite beam,and the excessive high masonry wall will reduce the ultimate load of the tested specimen.Finally,the reasonable range for height-span-ratio of supported masonry wall was presented,and the proposed value representing the flexural stiffness of the steel plate-composite beam relative to the in-plane stiffness of the supported masonry wall was at least more than 79.