RC顶升托梁与砖砌体界面受力性能试验研究

Experimental study on mechanical properties of interface between RC jacking joist and brick masonry

为研究RC顶升托梁与砖砌体接触界面的复合受力性能,设计了8个双梁夹墙构件,对其进行静力加载试验。研究不同构件长度、接触面面积对托换结构受力性能的影响。试验结果表明,托换构件有两种破坏形式:一是沿RC顶升托梁与砖砌体界面发生滑移破坏;二是上部砖砌体局压破坏。随着界面面积的增大,从界面滑移破坏向砖砌体局压破坏发展。根据试验研究结果,建议托梁与砖砌体界面剪切强度增强系数取值范围为1.8~2.0。

In order to study the composite mechanical behavior of RC jacking joist and brick masonry contact interface,eight double-beam sandwiched wall members were designed and tested under static loading.The influence of different component length and contact area on the mechanical properties of underpinning structures is studied.The test results show that the underpinning member has two failure modes:one is the sliding failure along the interface between RC jacking joist and brick masonry;The second is the local pressure destruction of the upper brick masonry.With the increase of interface area,the failure of brick masonry develops from interface slip to local pressure failure.According to the experimental results,it is suggested that the shear strength enhancement coefficient of joist and brick masonry interface should be in the range of 1.8~2.0.