混凝土翼板完全断开的钢-混凝土组合梁纯钢梁段的受压翼缘局部稳定性分析  

LOCAL STABILITY ANALYSIS OF COMPRESSION FLANGE OF STEEL SECTION OF COMPOSITE STEEL-CONCRETE BEAMS WITH WHOLE OPENINGS IN CONCRETE SLAB

作　　者：聂建国[1] 王宇航[1] 

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

出　　处：《工程力学》2010年第4期90-94,104,共6页Engineering Mechanics

基　　金：国家杰出青年基金项目(50025822)

摘　　要：为解决实际工程中遇到的混凝土翼板完全断开的钢-混凝土组合梁受压翼缘局部稳定性问题,基于薄板理论,对组合梁混凝土翼板开洞处纯钢梁段受压翼缘的临界屈曲应力计算公式进行了推导,考虑了弯矩梯度的影响,并用通用有限元软件ANSYS验证了公式的准确性。根据临界屈曲应力计算公式得出了合理的受压翼缘宽厚比限值,与现行《钢结构设计规范》中的规定进行了对比。对比结果表明:将《钢结构设计规范》中的宽厚比限值直接用于组合梁开洞处的纯钢梁段,显得过于保守。最后通过算例分析,进一步验证了该文的结论。Local buckling analysis of compression flange of steel section of composite steel-concrete beams with openings in concrete slab is conducted based on thin plate theory, considering the effects of moment gradient. The buckling stress calculated by theoretic method is verified by finite element program ANSYS. The flakiness ratio limit of compression flange of steel beam at the openings is proposed for calculating buckling stress. A comparison with the current Code for Design of Steel Structure indicates that flakiness ratio limit in Code is conservative for steel section of composite steel-concrete beams with openings in concrete slab. An example is given to support the conclusion.

关 键 词：钢-混凝土组合梁 翼板开洞 局部稳定性 受压翼缘 弯矩梯度 

分 类 号：TU318.1[建筑科学—结构工程]