主管管壁加厚的T型圆钢管节点抗火性能有限元研究  

Finite Element Analysis on Fire Resistance of Circular Hollow Section T-joint with Chord Reinforcement

作　　者：张红燕[1] 邵永波[1] 何树宾[1] 杨杰[1] 

机构地区：[1]烟台大学土木工程学院,山东烟台264005

出　　处：《烟台大学学报（自然科学与工程版）》2014年第2期141-147,共7页Journal of Yantai University(Natural Science and Engineering Edition)

摘　　要：分别对未加固T型圆钢管节点和主管管壁加厚的T型圆钢管节点在高温恒载作用下的抗火性能进行了有限元分析.通过试验结果验证了有限元模型的有效性,并在此基础上建立了瞬态分析模型.分析时,升温曲线及热力学参数均按照欧洲规范(Eurocode 3)的规定选用;采用间接热力耦合的方法;忽略高温蠕变的影响.考虑了荷载比及主管管壁加厚程度对主管变形、主管端部轴向反力的影响;对比了不同荷载比下临界时间和临界温度;得到了不同情况下模型的失效模式.分析发现管壁加厚能有效提高T型圆钢管节点的耐火性能,并且在加固节点中,当管壁厚度和荷载比均较大时,失效模式由节点失效变为构件失效.Finite element （FE） method is used to investigate the fire resistance of circular hollow section（CHS） T- joint with and without chord reinforcement at elevated temperature. The accuracy of the FE model is verified by ex- perimental results, and transient analysis model for heat transfer is built. Heating curve and thermal parameters are defined in according to corresponding specifications in Eurocode 3 （2005）. Sequentially coupled thermal-stress a- nalysis method is used and creep under high temperature is ignored. The effect of loading ratio and the reinforce tube wall thickness on the chord deformation and on the reaction force at chord ends are studied. Critical times and temperatures under different loading ratios are compared, and different failure modes are obtained. Based on the FE analyses, it is found that chord reinforcement can improve the duration of fire resistance significantly for CHS T- joint. Additionally, with the increase of tube wall thickness and loading ratio, the failure mode transforms from joint failure into component failure.

关 键 词：T型圆钢管节点 管壁加厚 抗火性能 有限元分析 

分 类 号：TU391[建筑科学—结构工程]