负弯矩作用下腹板开洞组合梁极限承载力有限元分析  

Finite element analysis on ultimate bearing capacity of composite beams with web opening under negative moment

作　　者：廖文远[1] 周东华[1] LIAO Wenyuan ZHOU Donghua(College of Construction Engineering, Kunming University of Science and Technology, Kunming 650224, Chin)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650224

出　　处：《四川建筑科学研究》2016年第5期5-9,共5页Sichuan Building Science

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

摘　　要：通过有限元软件ANSYS建立了非线性有限元模型,对负弯矩作用下腹板开洞钢-混凝土组合梁的极限承载力进行了分析计算。将有限元结果与试验结果进行了对比,吻合良好,验证了有限元模型的准确性和可靠性。分析表明:负弯矩作用下的组合梁腹板开洞后,其刚度和承载力降低很大,通过增加混凝土板厚度可以显著提高其承载力,而增加混凝土板配筋率能有效提高其变形能力;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。Based on finite element software of ANSYS,nonlinear model of composite beam with web opening under negative moment is established,and the calculation results are compared with experimental results,which show that calculation results agree well with experiment results. The accuracy and reliability of the finite element model is verified. The analysis indicates that stiffness and ultimate capacity will reduce greatly after web opening. Through increasing the thickness of concrete slab,its bearing capacity can be enhanced markedly,and increasing the reinforcement ratio of concrete slab can improve its deformability effectively. Concrete slab makes a great contribution to shear capacity of web opening composite beam under negative moment.

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]