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钢索在大空间建筑火灾升温条件下的力学反应是评价索网结构抗火性能的关键依据。基于非线性有限元方法,建立了钢索在高温下的力学分析模型,模拟了大空间建筑火灾升温历程中钢索力学反应全过程,用参数分析方法得到影响钢索在火灾升温历程中力学反应的关键因素。结果表明:在大空间建筑火灾升温历程中,钢索的水平张力呈下降的趋势;随着钢索的预应力比增加、温度场非均匀性的增强和跨度的增加,其水平张力下降速率增大;荷载比的增加对水平张力下降速率影响较小。上述结论与钢索水平张力的解析解一致,可为索网结构抗火性能分析提供参考。
The mechanical response of the cable under the condition of large space building fire heating is the key basis to evaluate the fire resistance performance of the cable network structure. Based on the nonlinear finite element method, the mechanical analysis model of steel cable under high temperature was established, the whole process of steel cable mechanics reaction was simulated in the process of fire in large space building, and the mechanical response The key factor. The results show that the horizontal tension of the cable tends to decrease in the process of building fires with large space. With the increase of the prestress ratio of the cable, the increase of the non-uniformity of the temperature field and the increase of the span, the horizontal tension decrease rate increases The increase of load ratio has little effect on the horizontal tension drop rate. The above conclusion is consistent with the analytic solution of the horizontal tension of the cable, which can provide a reference for the analysis of the fire resistance of the cable network structure.