钢骨混凝土核心柱温度场及高温后剩余承载力性能研究

首先，在合理建立室内火灾传热模型的基础上，利用有限单元法给出了内配圆钢管的钢骨混凝土核心柱高温下温度分布的数值计算方法，并编制了有限单元法的计算程序，通过与所进行的火灾试验对比分析，验证了分析理论及计算程序的正确性；其次，在确定核心柱截面温度场分布后，通过非线性有限元方法和数值积分方法，编制了计算火灾后核心短柱剩余轴压承载力的程序；最后，通过对2根核心柱的高温后承栽力试验，验证了理论计算的正确性。理论计算和试验结果都表明，内配圆钢管的钢骨混凝土核心柱在遭受火灾后承载力降幅较小且承载力曲线下降缓慢，表明其具有良好的抗火性能。

Research on Temperature Distribution and Mechanical Behavior of the Column Reinforced by Inner Circular Steel Tube during and after Fire

Heat transfer models of a compartment fire have been established in this paper, and using the method of the finite element to analyze the temperature distribution in column reinforced by inner circular steel tube. Based on this procedure, a corresponding program is composed. The effectiveness and reliability of the approach are validated by the good agreement between the theoretical results and the experimental data at elevated temperature. After getting the temperature field in column section, method of non-linear finite element and numerical integration are combined to compose a program for calculating the residual axial force of the column after fire. Through experimental studies of 2 columns after high temperature, the correctness of theoretical analysis and computation is proofed. Results show that column reinforced by inner circular steel tube have good load-bearing performance after fire.