中文摘要：

柱面弦支网壳是一种新型的预应力空间结构形式,为了保证其应用中的抗火安全,开展其火灾下的结构响应分析意义重大.本文以三环弦支正交正放柱面钢结构网壳为研究对象,首先利用有限元分析软件Marc开展了该空间结构的温度响应分析.在此基础上,进一步对火灾下结构的位移及内力进行了数值模拟.讨论了不同火源位置、结构的矢跨比等因素对该结构火灾响应的影响,并分析了结构的整体破坏形态及极限温度.结果表明,随着火灾温度的升高,该结构的变形逐渐呈现为＂上凸形＂,位于结构下部的预应力拉索较早退出工作,但因结构已有较大的起拱度,整体结构并未发生坍塌.同时,矢跨比对该结构的整体抗火性能有一定影响,其中矢跨比为1/10时的结构抗火性能较好.

英文摘要：

Suspend-reticulated cylindrical shell is one of the newly developed space structures.In order to make the structure have better anti-fire performance in practice,it is necessary and important to conduct deep analysis of fire response of the structure.Oriented toward pre-stressed suspend-reticulated cylindrical shells with three circumferential cables,thermal response of the spatial steel structure is first analyzed with the software Marc developed based on FEM.The displacements and internal forces of the structure in fire are obtained.Effect of the factors such as location of fire source and rise-to-span ratio on fire response of the structure is discussed,and the overall pattern of damage of the structure and the ultimate temperature born by the structure are analyzed.It shows that the spatial structure under fire presents the evident deflection upwards as the fire temperature rises and the cables located in the structure is first out of work.However the overall collapse of the structure does not take place for that there is a large deflection upwards in the structure under fire.Besides,the numerical results show that rise-span ratio of the structure has certain effect on fire-resistant performance of the spatial structure,and the fire resistance of the pre-stressed suspend-reticulated cylindrical shell is better with a rise-to-span ratio of 1/16.