砌体墙托换结构受力性能试验研究

Experimental research on mechanical property of underpinning structure in masonry wall

在建筑物移位工程中,对上部结构进行托换是其关键技术。为研究砌体托换结构的受力性能及破坏形态,设计了9个足尺砌体承重墙双梁式托换结构,对其进行静力加载试验,研究不同托换梁截面高度及纵筋配置对托换结构受力性能及破坏形态的影响。试验结果表明:托换结构出现了两种破坏形态,即砌体墙与托换梁界面冲切滑移破坏及砌体墙斜压或局压破坏;随着托换梁截面高度增加,从界面冲切滑移破坏向砌体墙斜压或局压破坏发展,而砌体墙的破坏现象与砌体结构中的墙梁破坏特征相似。根据试验结果,建议托换梁与墙体界面剪切强度取值为0.6 MPa。

Underpinning structure is the key process in building moving. In order to study the mechanical performance of the underpinning masonry structure, nine specimens of full scale double-beam underpinning structure were carried out under static loading. The influences of beam section height and reinforcement amount were investigated. The test results show that there are two kinds of failure modes, one is the punching and slippage failure and the other one is baroclinic bearing failure or local bearing failure of the masonry wall. As the beam section height becomes larger, the failure will transform from interface punching and slippage to the masonry wall failure. The masonry wall failure phenomena is similar to the wall-beam model of masonry structure. According to the test results, the interface strength between the underpinning beam and masonry wall is suggested.