XU Chengxiang,SUN Shaoyu,LIU Xiaoqiang.Analysis of Global Collapse Resistance in CFST Column‑steel Beam Frame Structures with Staggered Joints[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(03):611-619.
XU Chengxiang,SUN Shaoyu,LIU Xiaoqiang.Analysis of Global Collapse Resistance in CFST Column‑steel Beam Frame Structures with Staggered Joints[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(03):611-619. DOI: 10.13409/j.cnki.jdpme.20231124003.
Analysis of Global Collapse Resistance in CFST Column‑steel Beam Frame Structures with Staggered Joints
To investigate the progressive collapse resistance of concrete-filled steel tubular (CFST) column-steel beam frame structures with staggered joints
numerical models
with varying staggered floor heights were developed in OpenSees based on existing experimental data. Incremental dynamic analysis (IDA) was conducted using 20 ground motion records to derive collapse fragility curves
and the structural global collapse resistance was evaluated using the safety reserve factor against collapse. Results indicated that at low ground motion intensities
the staggered joint height had minimal impact on structural bearing capacity and deformation
with slight differences in IDA curves. However
at high intensities
significant differences emerged between staggered frames and ordinary frames. The third type of staggered frame exhibited faster deformation growth and greater late-stage degradation compared to the first and second types as well as the ordinary frame. Collapse Margin Ratio (
CMR
) values for ordinary (KJ-1)
first-type staggered (SKJ-1)
second-type staggered (SKJ-2)
and third-type staggered (SKJ-3) frames were 3.53
2.75
2.2
and 1.8
respectively. SKJ-1
SKJ-2
and SKJ-3 showed 22.1%
37.7%
and 49.0% reductions in
CMR
compared to KJ-1. These findings demonstrate that staggered joint frames have significantly lower global collapse resistance than ordinary frames
with performance decreasing as staggered joint height increases.
关键词
Keywords
references
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