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通过对采用体外预应力加固的大空间门式刚架抗火实例的分析,研究体外预应力张拉设计值、体外预应力索截面积及撑杆高度对无保护大空间门式刚架结构加固后抗火性能的影响。结果表明:在火灾作用下,采用体外预应力加固后的大空间门式刚架结构具有较好的抗火性能,能够满足抗火设计要求。此研究可为无保护大空间门式刚架结构采用体外预应力加固后的抗火设计提供参考。
Through the analysis of fire resistant examples of large-scale portal frame strengthened with external prestressing, the design value of external prestressing tension, the external prestressing cable cross-sectional area and the height of stay pole are used to reinforce the unprotected large-space portal frame structure After the fire resistance of the impact. The results show that under the action of fire, the large-space portal frame strengthened with external prestressing has good fire resistance and can meet the requirements of fire resistance design. This study can provide a reference for fire-resistant design of unprotected large-space portal frame structure strengthened with external prestress.