A类蒸压加气混凝土砌块墙体抗震性能试验

目的研究采用普通砂浆和专用砂浆砌筑、普通砂浆配钢筋和配纤维以及专用砂浆配纤维的A类蒸压加气混凝土砌块墙体的抗震性能,为工程设计提供科学依据.方法对A类蒸压加气混凝土砌块墙体采用水平荷载作用下的伪静力试验,试件的上下两端设置了钢筋混凝土梁,通过四连杆装置保证墙体顶部在水平力作用下只有平动而无转动,并采用同步液压加载装置模拟房屋层间墙体作用的竖向荷载.结果纤维墙体的开裂荷载比不配纤维的墙片提高了50%,极限位移增加了70%.配筋墙体极限荷载较不配筋的墙体提高了40%,开裂荷载和极限位移提高了近一倍.水平配筋和配纤维不但提高了砌块的承载能力,而且也改善了砌块的脆性性质.在灰缝中配纤维和钢筋延缓了砌体的开裂,大幅度提高了砌体的变形能力.结论对蒸压加气混凝土墙体进行适量的配筋和配纤维可以很好地改善其脆性,提高其延性,增强其变形能力,从而可以提高房屋的抗震能力.

Experimental Study on Seismic Performance of Autoclaved Aerated Concrete Block Bearing Walls

The purpose of this paper is to study the seismic performance of A-type autoclaved aerated concrete block wall with ordinary and special mortar, the ordinary mortar with steel bar and glass fiber mesh and special mortar with fibers mesh. The pseudo-static test which subjects to horizontal load on the A-type autoclaved aerated concrete block wall was adopted. Reinforced concrete beams were set up at the upper and lower ends of the test block, and the four-bar linkage device was provided to ensure that the top of the wall was only in translatory motion, not in rotation at the level force. Hydraulic synchronous loading device was adopted to simulate the vertical load which was produced by the wall of the housing interlayer. The fiber wall＇s dehiscence load was increased by 50% than the wall piece without the fiber and the limit displacement was increased by 70%. The ultimate load of reinforcing bars wall was enhanced by 40% than the unreinforced wall, and the dehiscence load and the limit displacement were doubly enhanced. The autoclaved aerated concrete block with horizontal reinforcement and fibers not only improved the carrying capacity of the block, but also improved the brittle nature of the block. The mortar joint with fiber and steel bar can delay cracking, and greatly enhance the deformation capacity of masonry. Autoclaved aerated concrete wall with an appropriate reinforcement and fiber can improve its brittleness and ductility and enhance its deformability, with the result of improving the seismic capacity of the housing.