翼板开洞率100%的钢-混凝土组合梁整体弹性稳定性分析  

ELASTIC LATERAL STABILITY ANALYSIS OF COMPOSITE STEEL-CONCRETE BEAMS WITH WHOLE OPENINGS IN CONCRETE SLAB

作　　者：聂建国[1] 王宇航[1] 蔡奇[2] 

机构地区：[1]清华大学土木工程系结构与振动教育部重点实验室,北京100084 [2]北京市市政工程研究院,北京100037

出　　处：《工程力学》2010年第6期51-56,64,共7页Engineering Mechanics

基　　金："十一五"国家科技支撑计划重大项目(2006BAJ03A03-02)

摘　　要：在实际工程中由于功能的需要出现了混凝土翼板完全断开的钢-混凝土组合梁,洞口在混凝土翼板完全断开使得组合梁在正弯矩作用下存在整体稳定性问题。该文首先运用有限元软件ANSYS建立弹性有限元模型对整体侧扭失稳模式进行了初步分析。在此基础上假设了组合梁整体失稳时的侧移函数和截面转角函数,运用瑞利-里兹能量法推导出了翼板完全断开的钢-混凝土组合梁侧扭失稳模式的临界弯矩计算公式,并进行了参数分析。最后通过计算实例说明了该文分析内容及结果的必要性。In order to satisfy the requirements of practice,the floor has to be cast with openings.Thusly,the composite steel-concrete beams with whole openings in concrete slab appear.The problem of lateral stability of composite beams resisted sagging moment exists because of the whole openings.The elastic finite element mode is established to analyze the lateral buckling of the composite steel-concrete beams with whole openings in a concrete slab.Based on FEA analysis,the lateral displacement function and rotation function of a cross section is assumed so as to use Rayleigh-Ritz energy method.The formula to calculate the critical buckling load of composite steel-concrete beams with whole openings in the concrete slab is conducted based on Rayleigh-Ritz energy method.Then the parameter analysis is conducted.At last,the necessity of lateral stability of composite beams with whole openings in the concrete slab is indicated by the calculation example.

关 键 词：钢-混凝土组合梁 翼板完全断开 整体弹性稳定 侧扭 能量法 

分 类 号：TU318.1[建筑科学—结构工程]