负弯矩作用下腹板开洞组合梁受力性能试验与有限元分析  

Experimental research and finite element analysis on mechanical behavior of composite beams with web opening under negative moment

作　　者：廖文远[1] 周东华[2] 刘德稳[1] Liao Wenyuan Zhou Donghua Liu Dewen(College of Civil Engineering, Southwest Forestry University, Kunming 655024, China College of Construction Engineering, Kunming University of Science and Technology, Kunming 650224, China)

机构地区：[1]西南林业大学土木工程学院,昆明655024 [2]昆明理工大学建筑工程学院,昆明650224

出　　处：《建筑结构》2017年第4期12-16,43,共6页Building Structure

基　　金：国家自然科学基金项目(51268022);国家青年科学基金项(51308269)

摘　　要：为了研究负弯矩作用下腹板开洞钢-混凝土组合梁的极限承载力及相关受力性能,对4根组合梁试件进行了试验研究和有限元分析。结果表明,负弯矩作用下的组合梁腹板开洞后,其刚度和承载力明显降低,洞口区域应变不再符合平截面假定;通过增加混凝土板厚度可以提高其承载力;混凝土翼板对负弯矩区腹板开洞组合梁的抗剪承载力有很大的贡献;洞口形状对其受力性能有较大的影响。In order to investigate the ultimate bearing capacity and relevant mechanical behavior of steel-concrete composite beams with web opening under negative moment,four composite beams were tested and finite element analyses were conducted. The results indicate that the stiffness and ultimate bearing capacity reduce greatly after opening holes in web of composite beam under negative moment and the opening area strain does not fulfill plane hypothesis. Increasing the thickness of concrete slab can improve its bearing capacity. Concrete flange makes a great contribution to shear capacity of composite beams with web opening in negative moment area and the shape of opening has a notable influence on its mechanical behavior.

关 键 词：组合梁 腹板开洞 负弯矩作用 有限元分析 极限承载力 

分 类 号：TU398.9[建筑科学—结构工程]