WU Wenqing,ZHU Nanhai.Seismic Collapse Analysis of Single‑Layer Reticulated Spherical Shell Structure Based on AP Method[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(03):632-639.
WU Wenqing,ZHU Nanhai.Seismic Collapse Analysis of Single‑Layer Reticulated Spherical Shell Structure Based on AP Method[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(03):632-639. DOI: 10.13409/j.cnki.jdpme.20221226003.
Seismic Collapse Analysis of Single‑Layer Reticulated Spherical Shell Structure Based on AP Method
the weak components of a structure are highly likely to experience initial failures
leading to collapse in subsequent earthquakes. To study the progressive collapse resistance of single-layer reticulated spherical shell structures under initial member failure
the Incremental Dynamic Analysis (IDA) method was employed to analyze distribution of weak areas in the structures and their dynamic response. Maximum response parameters (stress
plastic strain
equivalent plastic strain
etc.) were introduced to identify initial failure members. The Alternate Path (AP) method was then used to analyze the dynamic response of the remaining structure under subsequent seismic actions. The results showed that the seismic weak areas of single-layer shell structures were primarily located at the base and were significantly affected by seismic forces. Under seismic loads
the initial failure of members in weak areas led to a sharp increase in structural response parameters such as maximum vertical displacement of nodes
plastic member ratio
and total strain energy
accelerating structural collapse. Due to the initial failure of members
significant plastic deformation occurred at both ends of the members
with evident plastic development in surrounding members. Attention should be paid to members in seismic weak areas
as initial failure in these areas will have a substantial impact on the overall structural integrity.
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