80m球径螺栓球节点单层球面网壳强震失效机理

发布时间：2018-11-07 14:50

【摘要】：为探究半刚性节点单层球面网壳在强震作用下的失效机理,以沈北新区80 m球径螺栓球节点单层球面网壳为研究对象,采用通用有限元软件ANSYS,引入节点试验和数值分析数据来模拟实际工程中螺栓球节点的抗弯性能,建立可考虑节点实际连接刚度的精细化数值模型,并进一步考虑局部杆件和节点加强、壳体外表面安装维护材料等不同结构条件的变化,在此基础上,对其开展强震作用下的失效机理研究.分析结果表明:沈北新区80 m球径螺栓球节点单层球面网壳的失效机理为局部节点瞬时大量破坏导致的结构动力失稳倒塌.局部加固网壳只能改善结构正常使用状态的各项响应指标,无法提高结构极限承载力.在现有结构表面安装维护面板,其各项响应指标(位移、支座反力等)皆明显增大,极限承载力下降57.1%,抗震能力明显降低.
[Abstract]:In order to investigate the failure mechanism of single-layer spherical reticulated shell with semi-rigid joints under strong earthquake, the single-layer spherical reticulated shell with 80 m spherical diameter and bolted spherical node in Shenbei New area was studied, and the universal finite element software ANSYS, was used to study the failure mechanism of single-layer spherical reticulated shell with semi-rigid joints. The test and numerical analysis data are introduced to simulate the bending behavior of the bolted joints in practical engineering, and a refined numerical model considering the actual connection stiffness of the joints is established, and further consideration is given to the strengthening of local members and joints. On the basis of the change of different structural conditions such as outer surface installation and maintenance materials, the failure mechanism of the shell subjected to strong earthquake is studied. The results show that the failure mechanism of single-layer spherical reticulated shell with 80 m spherical diameter is caused by the transient failure of local joints. Local reinforcement of latticed shell can only improve the response index of the structure in normal service condition, but can not improve the ultimate bearing capacity of the structure. When the maintenance panel is installed on the surface of the existing structure, the response indexes (displacement, support reaction force, etc.) are obviously increased, the ultimate bearing capacity is reduced by 57.1, and the seismic capacity is obviously reduced.
【作者单位】：结构工程灾变与控制教育部重点实验室(哈尔滨工业大学);哈尔滨工业大学土木工程学院;湖南大学土木工程学院;
【基金】：国家自然科学基金面上项目(51378147);国家自然科学基金青年基金(51308155)
【分类号】：TU399

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