耗能支撑-钢框架-剪力墙多重抗侧力混合结构振动台试验及数值分析

SHAKING TABLE TEST AND NUMERICAL ANALYSIS OF MULTIPLE LATERAL RESISTING HYBRID STRUCTURE COMPOSED OF BRACE, STEEL FRAME AND SHEAR WALL

  • 摘要: 本文对一个装配屈曲约束支撑(BRB)的10层1/8缩尺耗能支撑-钢框架-剪力墙多重抗侧力混合结构试件进行振动台试验,得到了试件的动力特性、加速度、位移和应变响应的实测数据,研究了钢框架的塑性发展状态,以及混凝土剪力墙的裂缝发展和分布规律;通过数值分析进一步得到了各层BRB的塑性发展程度及耗能情况,并研究了支撑-框架、钢框架及剪力墙之间的能量分配及相互作用,以及剪力墙中混凝土、钢筋及钢骨的损伤情况及塑性分布。研究表明:所有BRB及其连接均表现出优越的力学性能,BRB总耗能占结构总耗能的89.3%,表现出良好的减震效果;钢框架耗能仅为结构总耗能的0.3%,基本处于弹性状态;剪力墙1层~8层表面出现了大量水平微裂缝,但分布较为均匀,未出现集中破坏;钢筋及钢骨基本处于弹性状态。总之,在地震作用下,多重抗侧力混合结构试件中各部分协同工作状态良好,整个试件抗震性能优越。

     

    Abstract: A shaking table test was conducted on a 10-story 1/8 scaled multiple lateral resisting hybrid structure specimen composed of buckling restrained braces (BRBs), steel frame and shear wall. The dynamic characteristics, acceleration and displacement at each story, and the strains at some critical points of the specimen were tested. The plastic development of the steel frame and the crack evolution and distribution of the concrete shear wall were investigated. Furthermore, the plastic development and energy dissipation of the BRBs at each story were obtained by numerical analysis, and the energy distribution and interaction among the braced frame, steel frame and shear wall were revealed. The crack propagation of the concrete and the plastic distribution of the steel rebar and the encased steel section in the shear wall were examined. The results indicated that: All BRBs and their connections exhibited excellent mechanical performance, and it was found that the BRBs contributed to 89.3% of the total energy dissipation and exhibited excellent damping performance; The energy dissipation of the steel frame contributed to only 0.3% of the total structural energy dissipation, indicating that the steel frame was almost entirely elastic; A lot of horizontal micro-cracks were observed to be relatively uniformly distributed on the surface of the shear wall at floors 1-8, and there was no significant damage observed on the shear wall; both the steel rebar and the encased steel section were primarily elastic. In conclusion, BRBs, steel frame and shear wall worked together effectively under seismic loads, and the entire specimen exhibited excellent seismic performance.

     

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