配筋砌块砌体夹芯墙内外叶墙的协同工作性能研究

STUDY OF COLLABORATIVE WORKING PERFORMANCE OF THE INTERNAL AND EXTERNAL WALL OF REINFORCED BLOCK MASONRY

对4片不同形式拉结筋的配筋砌块砌体夹芯墙进行平面内低周反复水平加载试验和外叶墙平面外静力加载试验,研究配筋砌体复合节能墙体的外叶墙与内叶墙协同工作性能及外叶墙平面外受力性能。试验结果表明:配筋砌块砌体夹芯墙的内、外叶墙之间具有良好的协同工作性能;在设计的四种形式的拉结筋中,"Z"字形拉结筋的作用明显较弱,可在多层建筑中使用,但在高层建筑中建议不采用此种形式的拉结筋;另外三种形式的拉结筋在高层建筑中均可使用,但考虑到施工方便建议采用方框型拉结筋;拉结筋对外叶墙的平面外承载力起到了相当大的作用,在7、8度罕遇地震下外叶墙也能满足承载力要求及南方地区20层高建筑的抗风承载力要求。

Four reinforced masonry walls of different types of steel tie bars , whose outer wythes were tested subjected to an out-of-plane loading , were tested under horizontal low cyclic loading .The outer wythes ’ cooperation with the inner ones and mechanical behavior of the outer wythes were studied and analyzed .The results of the test showed that the outer wythes cooperated well with the inner ones; the steel tie bar made great contribution to the out-of-plane bearing capacity of the outer wythes .Of all the four designed types of steel tie bars , Z-ties worked the worst , which can be used in multilayer buildings and are suggested not to be used in high-rise buildings.However, the other three types can be used in high-rise buildings and considering construction convenience , among them the rectangular ties are the best choice .Seismic behavior under large earthquake of intensity 7 and intensity 8 and the wind load-bearing capacity of the outer wythes of a 20 stories building in Changsha are sufficient .