钢管约束钢筋混凝土柱抗火性能及基于火灾全过程的灾后力学性能

项目名称： 钢管约束钢筋混凝土柱抗火性能及基于火灾全过程的灾后力学性能

项目编号： No.51278153

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 杨华

作者单位： 哈尔滨工业大学

项目金额： 80万元

中文摘要： 钢管约束钢筋混凝土柱承载力高、延性好、抗震性能优越，可有效解决传统钢筋混凝土重载构件截面大、剪跨比过小、延性差等突出问题，具有广阔的应用前景。因其自身受力特点，钢管约束钢筋混凝土柱的抗火性能不同于钢管混凝土柱及钢筋混凝土柱。目前尚无该类新型构件抗火性能的研究报道，更无设计规范、规程可依，制约了该类新型组合结构的推广应用。为此，项目将针对圆钢管约束钢筋混凝土柱的抗火性能进行系统研究，分析火灾下构件的温度分布、变形发展与耐火极限；基于火灾全过程作用路径，引入构件在升、降温过程中的应力-应变历史，研究圆钢管约束钢筋混凝土的过火性能。上述研究将有利于揭示钢管约束钢筋混凝土在高温下与高温后的受力机理与破坏模式等科学问题，提供满足不同防火设计等级的抗火设计方法，建立火灾后该类结构评估与修复加固的技术体系，推进钢管约束钢筋混凝土结构的工程应用。

中文关键词： 钢管约束钢筋混凝土柱；火灾；温度场；耐火极限；剩余承载力

英文摘要： Steel tube confined concrete columns have a promising future in the structural application for their high load-bearing capacity, satisfactory ductility and seismic performance. This innovative type of columns provide an effective structural substitution for traditional overloaded reinforced concrete columns with huge cross section, illogically low shear span ratio or poor ductility. The fire performance of steel tube confined concrete columns differ from that of reinforced concrete columns or concrete-filled steel tubular columns due to their special mechanical behaviour. Up to date, neither research report nor relative code on the fire performance of steel tube confined concrete columns is available, which restricts the application and promotion of this composite structure. The project will focus on the fire performance of circular steel tube confined concrete columns, including the temperature distribution, deflection and fire resistance. Post-fire behaviour will be also concentrated with the consideration of the entire stage of fire exposure (including heating and cooling) and the corresponding stress and strain histories. The research will be beneficial to reveal the scientific issues, stress mechanism and failure modes, among steel tube confined concrete columns in / after fire exposure; to provide a fire d

英文关键词： steel tube confined reinforced concrete columns；fire；thermal distribution；fire resistance；residual capacities