摘要
应用有限元方法,采用刚性区法(CERIG命令)自动建立约束方程,并模拟平面钢框架在标准升温曲线下的温度场;然后将温度场导入结构中进行耦合计算,分析平面钢框架结构在局部火灾下的力学性能。结果表明:受火梁在三面受火情况下受热膨胀,产生反拱效应,随着温度的升高,刚度下降,挠度逐渐增大;受火柱在单面受火情况下的竖向位移取决于钢材的膨胀和软化程度,升温初期,热膨胀为主导因素,随着温度的升高,钢材逐渐软化,压缩量大于膨胀量。
Through analyzing the temperature field of plane steel frame under the standard temperature field by using finite element software and the method of rigid zone（ CERIG） which established constraint equations automatically. Then the mechanical properties of plane steel frame were analyzed by temperature-structure coupling method under local fire. The result showed that the beam expanded with the heating on its three surfaces and produced contra-arch effect in fire. With the increase of temperature,the stiffness of the beam in fire decreased and the deflection gradually increased. The vertical displacement of the columns which were heated on one surface depended on the magnitude of expansion and softening of steel. In the early time,the expansion was the determinant factor. With the temperature rose,steel gradually softened,and the compression was greater than expansion.
出处
《钢结构》
北大核心
2017年第12期109-113,16,共6页
Steel Construction
关键词
平面钢框架
温度场
刚性区法
力学性能
plane steel frame
temperature field
the method of rigid zone
mechanical properties
