9度抗震设防区钢管混凝土束剪力墙结构性能影响因素分析

Analysis on structural parameters of concrete-filled multicellular steel tube shear wall in 9-degree seismic fortified area

钢管混凝土束剪力墙是一种新型双钢板-混凝土组合剪力墙。以某9度抗震设防区钢管混凝土束剪力墙结构为原始算例,采用动力弹塑性有限元分析方法,分别以最大层间位移角,结构底层总剪力、轴压比、最大弯矩和剪力,混凝土损伤和用钢量为评价指标,研究了钢管混凝土束剪力墙厚度、钢板厚度、端部腔体钢板厚度、混凝土强度等级和结构整体高宽比等因素对9度抗震设防区钢管混凝土束剪力墙结构性能的影响规律,结果表明增加钢管束端部腔体钢板厚度和提高钢管束内混凝土强度等级是提升钢管混凝土束剪力墙抗震性能的最有效措施,9度抗震设防区不宜仅通过增加墙体厚度对钢管束墙体进行加强。

The concrete-filled multicellular steel tube shear wall is a new type of double steel plate-concrete composite shear wall.A concrete-filled multicellular steel tube shear wall structure in a 9-degree seismic fortified area was took as the original calculation example and the dynamic elasto-plastic finite element analysis method was adopted.The maximum displacement angle between floors,the total shear force of the bottom of the structure,the axial compression ratio,the maximum bending moment and shear strength,the concrete damage and the amount of steel were used as evaluation indicators.The influence of the thickness of the concrete-filled multicellular steel tube shear wall,the thickness of the steel plate,thickness of end cavity steel plate,the concrete strength grade and the structural aspect ratio on the structural performance of the concrete-filled multicellular steel tube shear wall in the 9-degree seismic fortified area were studied.The results show that increasing the thickness of the steel plate in the end cavity of the steel tube bundle and increasing the strength level of the concrete in the steel tube bundle are the most effective measures to improve the seismic performance of the concrete-filled multicellular steel tube shear wall.It is not advisable to strengthen the wall of steel pipe bundles in the 9-degree seismic fortified area only by increasing the thickness of the wall.