密肋复合墙体的抗震性能对比分析

结合密肋复合墙体的斜截面抗剪和正截面受弯两组试验结果,对比分析密肋复合墙体的两种典型破坏模式,探讨二者的破坏机理,研究分析不同破坏模式下墙体的承载能力、延性等抗震性能。结果表明:剪切型破坏的墙体,能够按照"砌块—肋梁、肋柱—外框柱"的顺序依次发挥主导作用,具有多道抗震防线,属于有利的破坏模式;弯曲型破坏的墙体,外框柱先于墙板在柱脚发生拉压破坏,而墙板无明显破坏迹象,不易形成合理的破坏机制,属于不利的破坏模式。发生剪切破坏的墙体的延性和变形能力明显优于受弯试验中的墙体,故在设计中应保证边框柱与复合墙板之间刚度的合理匹配。最后推导出密肋复合墙体的正截面压弯承载力计算公式,并给出大小偏压的判断。

COMPARATIVE ANALYSIS OF SEISMIC PERFORMANCE OF MULTI-RIBBED COMPOSITE WALLS

In this paper,two groups of experiments on multi-ribbed composite walls which include oblique section shear bearing capacity tests and normal section bending capacity tests are represented.Based on the results of the experiments,the composite wall's two typical failure modes and failure mechanisrns are contrastively analyzed.The bearing capacity,deformation performance and other seismic performances of the walls with two different failure modes are studied.The results show that the wall with shear failure mode which is considered as an advantageous mode has several anti-seismic defending lines,for the three-part members of the load-beating system(filler blocks,concrete frame grids and concealed frame)can play a key role gradually in three stages(elastic stage,elastic-plastic stage and failure stage).Contrastively,a reasonable failure mechanism is difficult to form in the wall with bending failure mode which is considered to be disadvantageous.for concrete crush or steel failure will be found at the feet of the end frame columns prior to the serious damage of the inner slab.As the ductility and deformability of wall occurring shear failure ale absolutely superior to that of bending failure,a reasonable matching between the outer frame and the inner slab should be guaranteed.Finally.the formulas for normal section bending capacity of the wall are deduced,and the judgment criterion of large and small eccentric compression of the composite wall is established.