文档介绍：华侨大学
硕士学位论文
薄壁型钢-混凝土梁-柱节点抗火性能研究
姓名:王传奇
申请学位级别:硕士
专业:结构工程
指导教师:高轩能
20090601
摘要
薄壁型钢-混凝土组合结构是一种新型的结构形式,正逐步应用于
桥梁工程、多低层建筑、高层楼盖结构。为深入认识其耐火性能并为其
防火保护提供依据,论文对薄壁型钢-混凝土梁柱节点在标准
升温曲线下的抗火性能进行了数值模拟理论研究。
论文在考虑材料非线性和几何非线性的基础上,采用有限单元与有
限差分相结合的方法,编写了热分析程序,在计算程序得到相关
文献验证的基础上,分析了梁柱组合节点截面的温度场。其次,在得到
相关文献验证良好的基础上建立了常温下求解梁柱组合节点极限抗弯
承载力的非线性有限元模型,为火灾下施加“静力荷载水平”提供了依
据。然后,在运用进行结构抗火性能分析可行性论证的基础上,
编制了计算梁柱组合节点耐火极限的非线性有限元程序,并对梁柱组
合节点耐火极限影响因素进行了参数化分析。
通过理论分析及有限元数值模拟计算,得到以下主要结论在
升温曲线的升温条件下,构件截面的温度场分布不均匀,单纯地
采用临界温度来判定结构是否失效不准确;荷载水平对薄壁型钢混
凝土梁柱节点的耐火极限影响很大;当荷载水平一定时,防火保护层厚
度对梁柱组合节点的耐火极限影响显著,而其他参数对梁柱组合节点
耐火极限影响较小; 高温下薄壁型钢混凝土梁柱节点的破坏主要
表现为钢板的局部屈曲; 薄壁型钢混凝土梁柱节点在不加防火保护
时的耐火极限仅为左右,需要采取防火保护才能达到《建
筑设计防火规范》规定的耐火极限要求;由于填充混凝土的吸热作
用及其能有效阻止薄壁钢板局部屈曲的过早发生,梁柱组合节点的抗火
性能明显要好于同等条件的纯钢结构节点。

关键词:薄壁型钢-混凝土组合结构;梁柱节点;热分析;耐火性能
I
Abstract
Thin-walled steel-posite structure is a new kind of
composite structure,which has been adapted gradually in bridge structures,
multi or low-rises buildings, and high-rises floor structures. In order to realize
the fire resistance performance of Thin-walled steel-concrete beam-to-column
joint (TSBJ) and provide credibility basis of fireproofing coating, numerical
simulation theoretical researches are carried out according to international
standard ISO-834.
Considering the nonlinearity of material and geometry, this paper
adopted bination method of finite element and finite-difference to
compose a thermal-analysis program of ANSYS validated by the good
agreement with relate literature and calculated the temperature field of the
component of the TSBJ. Secondly, a nonlinear finite element model validated
by the good agreement with relate literature was set up for calculating the
ultimate flexural capacity of TSBJ, which provide basis for getting “load
ratio” that brought to bear on TSBJ under fire. And then, based on having
demonstrated the feasibility of using ANSYS to analyze fire resistance of