北京新机场航站楼C2型钢柱结构承载力性能研究  

RESEARCH ON BEARING CAPACITY OF THE C2 COLUMN IN THE TERMINAL OF BEIJING NEW AIRPORT

作　　者：张爱林[1,2] 付婉琳 刘学春[1,2] 马晓飞[1] 柴抒韬 

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京工业大学北京市高层和大跨度预应力钢结构工程技术研究中心,北京100124

出　　处：《钢结构》2017年第7期1-5,11,共6页Steel Construction

基　　金：北京市科技计划课题(Z161100001216010)

摘　　要：基于北京新机场航站楼C2型钢柱结构,研究顶部水平约束对C2型钢柱结构破坏形式及竖向承载力的影响。利用有限元软件ABAQUS对模型进行非线性屈曲分析,得出C2型钢柱结构的破坏形态及应力分布情况,同时通过计算得出荷载-位移曲线、极限承载力等。对比不同约束条件下结构的承载力,提出适用于C2型钢柱结构的承载力计算方法。研究结果表明:随着顶部约束刚度的增大,C2型钢柱结构破坏形式由中心对称分布向单侧分布转变,最大应力集中在环向杆件及其连接的斜撑杆上,斜撑杆发生明显拱起变形;随着顶部约束刚度增大至80 kN/mm,屈服承载力及极限承载力均显著增大20%;随着顶部水平约束刚度由80 kN/mm增大到5 000 kN/mm,屈服承载力及极限承载力均呈现缓慢增长,分别增大4%和6%;刚度由5 000 kN/mm继续增加时,屈服承载力及极限承载力不再增加,因此适度增大结构顶部约束刚度即可显著增强结构抵抗竖向荷载的能力;采用的承载力计算方法可有效计算标准组合下C2型钢柱结构的竖向承载力值。Based on the C2 column in the Terminal of Beijing New Airport, the influence of the top restraint on the vertical bearing capacity and failure mode were analyzed by the nonlinear buckling analysis with ABAQUS. The failure mode and stress distribution of the C2 column were understood by the analysis. The load-displacement curve, yield bearing capacity and ultimate bearing capacity under the different top constraint conditions were calculated. Through the comparison of the bearing capacity under various top constraint conditions, the variation laws of the bearing capacity were gained. In the meantime, the calculation methods of the yield bearing capacity and ultimate bearing capacity for the C2 column were proposed. The results showed that the increase of the top restraint stiffness led to the transition of the failure mode of the C2 column from eentrosymmetrie distribution to unilateral distribution. The maximum stress was concentrated in the ring rods and the connected slant rod. As the stiffness of the top restraint increased to 80 kN/mm, the yield bearing capacity and ultimate bearing capacity rapidly increased, and both increased by 20%. As the stiffness of the top restraint increased from 80 kN/mm to 5 000 kN/mm, the yield bearing capacity and ultimate bearing capacity slowly increased by 4% and 6% respectively. When the stiffness of the top restraint continue to increase, the bearing capacity almost changed no more. Therefore, the bearing capacity could be significantly improved by increasing the top restraint stiffness properly. The calculation method of the capacity could be used to predicate the vertical bearing capacity of C2 column effectively.

关 键 词：C2型钢柱结构 顶部水平约束 破坏形式 竖向承载力 

分 类 号：TU392.1[建筑科学—结构工程]