火灾后型钢混凝土柱剩余承载力数值模拟分析

发布时间：2018-01-05 16:36

本文关键词：火灾后型钢混凝土柱剩余承载力数值模拟分析　出处：《工程力学》2014年S1期 　论文类型：期刊论文

【摘要】：利用MSC.MARC软件对火灾后型钢混凝土柱的截面温度场及剩余承载力进行了模拟分析,数值分析结果得到了试验验证。考虑混凝土强度、长细比、含钢率、荷载偏心率、受火时间等参数,利用MSC.MARC软件对ISO834标准火灾作用后型钢混凝土柱剩余承载力进行了进一步计算。计算结果表明,经历ISO834标准火灾作用后,型钢混凝土柱的极限承载力显著降低,在该文参数范围内,承载力降低幅度在8.5%~45.3%变化。定义火灾作用后型钢混凝土柱剩余承载力与常温下型钢混凝土柱极限承载力的比值k为火灾后型钢混凝土柱剩余承载力影响系数。数值模拟分析结果表明,混凝土强度、截面含钢率、受火时间对k值的影响较大,而长细比、偏心率对k值的影响相对较小。在数值计算结果基础上,通过回归分析的方法得到了火灾后型钢混凝土柱剩余承载力影响系数k的简化计算公式,公式计算结果与数值模拟分析结果符合较好。
[Abstract]:The residual and simulated analysis of the bearing capacity of section temperature field of steel reinforced concrete columns after fire using MSC.MARC software, the numerical analysis results are verified by experiment. Considering the concrete strength, slenderness ratio, steel ratio, load eccentricity, fire time and other parameters of the further calculation of the residual bearing capacity of steel reinforced concrete the ISO834 column after fire using MSC.MARC software. The calculation results show that the ISO834 standard after fire, significantly reduce the ultimate bearing capacity of steel reinforced concrete columns, in the range of the parameters in the bearing capacity decreased in the range of 8.5%~45.3%. The change of bearing capacity and bearing capacity of steel reinforced concrete columns at room temperature under the ratio of K bearing type the residual influence coefficient of steel reinforced concrete columns after fire residual steel reinforced concrete columns after fire is defined. The numerical analysis results show that the concrete strength, steel ratio of cross section, the time by fire on The effect of K value is larger, and the slenderness ratio, eccentricity of the value of K is relatively small. In the numerical calculation based on the results obtained by regression analysis method of steel reinforced concrete columns after fire residual coefficient K. Simplified calculation formula for the bearing capacity, analysis of the results are in good agreement with the results of the formula and numerical simulation.

【作者单位】：宁波大学建筑工程与环境学院;中国建筑科学研究院;
【基金】：国家自然科学基金项目(51178226) 宁波市自然科学基金项目(2013A610197) 宁波市重点学科项目(XKL11D2079)
【分类号】：TU375.3
【正文快照】： 型钢混凝土结构集中了钢结构和钢筋混凝土结构的优点,在高层超高层建筑中得到了广泛应用。高层超高层建筑由于使用面积大和用途复合化,火灾安全隐患相对较多,研究火灾后型钢混凝土结构的力学性能与承载能力损伤退化退率,对火灾后该类结构的性能评估及修复加固具有重要意义。目

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