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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。
Combined with the test results of shear strength of oblique section and positive section of multi-ribbed composite wall, two typical failure modes of multi-ribbed composite wall are compared and analyzed, and the failure mechanism of the two is discussed. Carrying capacity, ductility and other seismic performance. The results show that the shear failure wall can play the leading role in sequence according to the order of “block - ribbed beam, ribbed column - outer column”, and has multiple seismic lines of defense, which is a favorable failure mode. Damage to the wall, the outer frame before the column in the column foot tension and compression damage occurred, and no signs of obvious damage to the wall panels, not easy to form a reasonable mechanism of damage, is an adverse mode of destruction. The ductility and deformation capacity of the shear-damaged wall are obviously better than those in the bending test, so the reasonable matching of the stiffness between the bezel and the composite wall should be ensured in the design. Finally, the formula for calculating the ultimate bearing capacity of multi-ribbed composite wall is derived and the judgment of the size bias is given.