中文摘要：

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。

英文摘要：

The fire resistance of spatial structure has attracted people＇s attention with its gradual increment of fire accident. Combined with the Chiping Gymnasium and taking account of the heating and cooling temperature variation during the whole process of fire,the deformation,change in distribution of internal forces,reaction forces and other structural performances were obtained by analyzing the fire response of suspend-dome structure with stacked arch. The results indicated that the deformation of structure mainly appeared at the periphery of the upper lattice shell and the bars near fire. The pre-stress loss of cables was found to be severe so that some members were out of work.Meanwhile,stress concentration occurred on the members near the support. Finally,the structure remained linear elasticity in the larger loading range,and the bearing capacity of the structure was also higher after the fire.