1.江西理工大学土木与测绘工程学院,江西 赣州 341000
2.江西理工大学江西省环境岩土与工程灾害控制重点实验室,江西 赣州 341000
吴文青(1997—),男,硕士研究生。主要从事大跨空间钢结构研究。E‑mail: 1559215790@qq.com
朱南海(1981—),男,副教授,博士。主要从事大跨空间钢结构研究。E‑mail: zhunanhai@jxust.edu.cn
收稿:2022-12-26,
修回:2023-02-17,
纸质出版:2024-06-25
移动端阅览
吴文青,朱南海.基于AP法的单层球面网壳结构地震倒塌破坏分析[J].防灾减灾工程学报,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.
吴文青,朱南海.基于AP法的单层球面网壳结构地震倒塌破坏分析[J].防灾减灾工程学报,2024,44(03):632-639. DOI: 10.13409/j.cnki.jdpme.20221226003.
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.
在地震作用中,结构的薄弱部位构件可能会先发生初始失效,并导致结构在之后的地震中发生倒塌破坏。为研究在杆件初始失效下单层网壳结构的抗连续倒塌性能,通过增量动力分析方法(IDA法)确定网壳结构薄弱区域分布规律及结构的动力响应,引入最大响应参数(应力、塑性应变、等效塑性应变等)杆件作为初始破坏杆件,采用备用荷载路径法(AP法)分析剩余结构在之后的地震作用中产生的动力响应。结果表明:单层网壳结构地震薄弱区处于底部区域,且受地震影响较大。在地震作用下,处于薄弱区域的杆件初始失效会使结构节点最大竖向位移、塑性杆件比例、总应变能等结构响应参数急剧增大,并且加速了结构的凹陷。由于杆件的初始失效,其两端节点发生较大塑性,周围杆件塑性发展明显,应重点关注处于地震薄弱区的杆件,该区域杆件若发生初始失效将对结构产生影响较大。
Under seismic action
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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