带可更换连梁的联肢钢板仓组合剪力墙抗震性能有限元分析
Finite Element Analysis of Seismic Performance of Steel Plate Silo-Concrete Composite Shear Wall with Replaceable Coupling Beams
在联肢剪力墙结构体系中,剪力墙通过连梁连成整体以共同抵抗水平力,当遇到强烈地震时,连梁会通过屈服变形来耗散地震能量。可更换连梁是由跨中的耗能梁段和两端的非耗能梁段组成的连梁,梁段之间采用螺栓连接,便于震后修复和更换。本文利用ABAQUS软件建立了8组不同耦连比的带可更换连梁的联肢钢板仓组合剪力墙有限元分析模型,并对模型进行了单向推覆和往复加载。结果表明,不同耦连比下结构的抗震性能及破坏特征存在显著差异:耦连比过小时,可更换连梁首先发生破坏并造成联肢体系失效;耦连比过大时,组合墙肢会在可更换连梁耗能不充分的情况下提前破坏;当塑性耦连比在43%~47%之间,且与弹性耦连比的比值在90%以下时,可更换连梁先于组合墙肢发生屈服耗能,从而使结构具有良好的抗震性能。
In the coupled shear wall structural system, shear walls are interconnected by coupling beams to resist lateral forces collectively. Under strong seismic events, coupling beams dissipate seismic energy through yielding deformation. Replaceable coupling beams consist of energy-dissipating beam segments at midspan and non-energy-dissipating beam segments at both ends, connected by bolts to facilitate post-earthquake repair and replacement. The finite element models of steel plate silo-concrete composite shear walls with replaceable coupling beams under eight different coupling ratios were established using ABAQUS software. Monotonic pushover and cyclic loading analyses were conducted. The results indicate significant differences in seismic performance and failure characteristics under varying coupling ratios. With a low coupling ratio, the replaceable coupling beam fails first, leading to the failure of the coupled system. With a high coupling ratio, composite wall limbs fail prematurely before the replaceable coupling beams fully dissipate energy. When the plastic coupling ratio ranges from 43% to 47%, and the ratio of plastic to elastic coupling ratios remains below 90%, the replaceable steel coupling beams yield and dissipate energy before the composite wall limbs, achieving favorable seismic performance for the structure.
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