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随着空间结构火灾事故的逐年上升,社会对空间结构的抗火性能日益关注。结合山东茌平体育馆工程,考虑火灾升温-降温全过程温度变化,对弦支穹顶叠合拱复合结构进行火灾响应分析,获得火灾全过程中结构的变形、内力分布变化、支座反力变化等结构响应。研究表明:火灾作用下,结构的显著变形主要集中在上层网壳的外围和靠近火源的杆件,拉索的预应力损失较严重,部分杆件退出工作,支座附近的杆件发生应力集中,结构在较大的受力范围内表现为线弹性特征;受火冷却后,结构仍具有较高的承载力。
As the space structure fire accidents rise year by year, society’s fire resistance performance of the space structure is increasingly concerned. Combining with the project of Shandong Pingping Gymnasium, considering the temperature change during the course of temperature rising and cooling, the fire response of the composite structure of the chord branch dome is obtained, and the structural deformation, internal force distribution and bearing reaction force change are obtained during the whole process of fire Structure response. The results show that under the action of fire, the significant deformation of the structure mainly concentrates on the periphery of the upper reticulated shell and the rod near the fire source. The prestressing loss of the cable is more serious. Some of the rods are withdrawn from work and the rod near the support is stressed Concentration, structure in a larger range of force showed linear elastic characteristics; by the fire cooling, the structure still has a high bearing capacity.