【摘要】 利用软件ABAQUS进行了凯维特单层球面网壳抗火非线性全过程分析,研究了网壳结构火灾高温下变形发展规律、耐火极限状态以及耐火极限的影响因素。分析表明,火灾中的网壳首先表现为以热膨胀变形为主,然后由于材料软化导致整体失稳;火源位置对网壳的耐火极限有明显的影响;承载水平升高,耐火极限降低。更多还原

【Abstract】 A nonlinear analysis of a single layer spherical Keweit lattice shell at elevated temperatures is carried out using ABAQUS.The evolution of deformation with regard to time is obtained,and the ultimate limit state in fire and the fire-resistance are also discussed.The results show that thermal expansion is the main deformation of a Keweit lattice shell in the first stage,and then material softening induces the global buckling of the structure;the fire location has an important impact on fire-resistance of the lattice shell,and the fire-resistance decreases when load increases.更多还原