铝合金板式节点火灾后承载性能

Bearing Performance of Aluminum Alloy Gusset Joints After Fire

摘要:

对铝合金板式节点火灾后性能的研究可为评估铝合金网壳火灾后承载性能提供依据。完成了6061-T6铝合金材料过火后的单向拉伸试验，给出了其火灾后力学性能折减系数的计算式。完成了12件6061-T6铝合金板式节点过火后的承载性能试验，得到其承载力和破坏模式。试验结果表明，铝合金材料性能及铝合金板式节点力学性随过火温度的变化均呈现三折线趋势。建立数值模型并进行参数分析，分析了材料性能、过火温度、尺寸规格对铝合金板式节点过火后承载性能的影响规律。最后，拟合得到铝合金板式节点火灾后的弯曲刚度及承载力计算式以及火灾后的弯矩-转角曲线四折线模型。

关键词:铝合金板式节点;火灾后;承载性能

Abstract:

Research on the over-fire performance of aluminum alloy gusset （AAG） joints can provide a basis for evaluating the bearing performance of aluminum alloy reticulated shells after fire. The tensile tests of 6061-T6 aluminum alloy after fire were conducted and the formula of reduction coefficient of mechanical property after fire was given. The bearing performance tests of 12 pieces of 6061-T6 aluminum alloy gusset joints after fire were performed. The bending capacity and the possible failure modes of aluminum alloy gusset joints after fire were presented. The test results indicate that the material property of aluminum alloy and the mechanical property of aluminum alloy gusset joints show a three-fold trend with the change of fire temperature. Parametric analysis was carried out based on the numerical model to study the influence of material properties， over-fire temperature， and size specifications on the bearing performance of aluminum alloy gusset joints after fire. Finally， through numerical fitting， the calculation formula of the bending stiffness and the bearing capacity of aluminum alloy gusset joints after fire and the four-line model of moment-rotation curve were obtained.

Key words:aluminum alloy gusset joint;after fire;bearing capacity