高性能混凝土结构火安全可恢复性研究进展-《建筑科学与工程学报》

文章信息/Info

Title:: Research Progress on Fire Safety Resilience of High Performance Concrete Structure

Author(s):: XIAO Jian-zhuang, LIU Liang-lin, ZHANG Ze-jiang, PENG Gai-fei, LU Zhou-dao; College of Civil Engineering, Tongji University

Keywords:: high performance concrete structure; fire damage; reparation and strengthening; fire safety resilience

摘要:: 从材料、构件、结构3个层面梳理了高性能混凝土结构火安全可恢复性的相关研究文献，厘清发展脉络。分析结果表明：基于混凝土结构火安全可靠度要求，可以通过建筑结构设计、修复与加固等流程与措施，使得高性能混凝土结构火灾后的性能恢复到初始水平甚至有所提升；利用修复剂涂抹或浸泡、水养护的方式均能实现火灾后高性能混凝土强度的逐渐恢复与裂缝愈合；利用电化学再碱化技术可实现火灾后混凝土pH值的恢复，减少碳化深度；利用碳纤维加固火灾后构件可实现承载力的恢复，但是对于刚度恢复程度较低；梁侧钢板加固、粘钢加固可实现火灾后构件承载力、刚度与延性的可恢复性。这些混凝土结构火安全可恢复性的方法可以为高性能混凝土结构的防灾减灾提供理论指导。

Abstract:: The relevant research literatures on fire safety resilience of high performance concrete structures were collected and classified as three levels i.e., materials, components and structures, and the development context of fire safety was clarified. The analysis results show that according to fire safety reliability requirements for concrete structures, the performance of structure after being exposed to fire can be recovered and even being improved compared to the initial level by means of structural design, reparation and strengthening. The strength of high performance concrete can be recovered gradually and the size of crack in the concrete surface can be reduced by brushing or soaking reparation agent and water curing. The pH value of concrete can be recovered and the carbonation depth can be decreased by the electrochemical realkalization technique. The load bearing capacity of concrete components after fire can be recovered by carbon fiber reinforced polymer, but the stiffness is recovered a little. The load bearing capacity, stiffness and ductility of concrete components after fire are resilient by the bolted sideplating technique and bonding steel plate. All these measures of fire safety resilience for high performance concrete structures can be used to guide the design of practical engineering for disaster prevention and reduction.