北京新机场航站楼C3和C5型柱体系整体稳定分析  

OVERALL STABILITY ANALYSIS OF C3-COLUMN AND C5-COLUMN STRUCTURES IN THE TERMINAL OF BEIJING NEW AIRPORT

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

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8期1-6,共6页Steel Construction

基　　金：北京市科技计划课题(Z161100001216010)

摘　　要：北京新机场航站楼C型柱曲面形状复杂,双向刚度不对称,整体稳定是其设计与分析中的关键问题之一。对C3和C5型柱进行了特征值屈曲分析;考虑初始缺陷影响、几何与材料非线性对C3和C5型柱进行了非线性屈曲分析,考察了C型柱的整体稳定性,研究了初始缺陷分布形式与缺陷幅值对C型柱整体稳定性的影响。分析结果表明:C3和C5型柱的前100阶特征值屈曲模态均为局部屈曲;C3和C5型柱达到临界荷载后不会因为局部杆件失稳而突然丧失承载能力,具有良好的整体稳定性;在各自以第1~3阶自振振型分别作为初始缺陷分布形式时,C3和C5型柱的临界荷载系数与无初始缺陷柱相比分别最大下降8.8%和9.7%,C型柱对初始缺陷的施加不敏感;在不同振型作为初始缺陷分布形式的情况下,各荷载-位移曲线重合度较高,C型柱对初始缺陷分布形式的变化不敏感;C3和C5型柱对初始缺陷的幅值在L/1 000~L/300(L为柱高)间变化同样不敏感。建议在C型柱整体稳定分析中,初始缺陷幅值取L/300。The C-type column in the terminal of Beijing new airport have completed curved surface with asymmetry stiffness,the overall stability is one of the key problems in its design and analysis. Based on the C3-column and C5-column,the overall stability of the C-type column was investigated by considering the initial defects,geometric and material nonlinearity,the effect of initial imperfection distribution form and its amplitude on the overall stability of C-type column were also examined. It was shown that the first 100 modes of eigenvalue buckling were all local buckling for C3-column and C5-column. The buckling of local members would not lead to a sudden loss of bearing capacity after reaching the critical load,which indicated that C3-column and C5-column had a good overall stability. Compared to the non-imperfection column,when the natural vibration modes was regarded as the initial imperfection,the critical load coefficients of C3-column and C5-column have dropped as much as 8. 8% and 9. 7% respectively,C-column was not sensitive to the introduce of initial imperfection. Under the condition of different modes for the initial imperfection,the load-displacement curves were similar,C-type column was not sensitive to the distribution form of the initial imperfection. The C3-column and C5-column were also not sensitive to the change of the initial imperfection amplitude between L/1 000 to L/300（ L as cloumn height）. L/300 was suggested as the initial imperfection amplitude in the overall stability analysis of C-type column.

关 键 词：C型柱 非线性屈曲分析 初始缺陷 整体稳定 

分 类 号：TU311.2[建筑科学—结构工程]