波形钢腹板钢管混凝土梁有限元分析及参数研究

提出新型组合结构——波形钢腹板钢管混凝土梁三维有限元计算方法.应用ANSYS程序对试验梁进行了双重非线性有限元分析,计算结果与试验结果吻合较好.应用有限元方法,以波形钢腹板厚度、弦管壁厚以及管内混凝土等级为参数对其对受力性能和极限承载力的影响进行了分析.结果表明,对于以上弦管局部屈曲为特征的A梁,若要提高其承载力,应增加上弦管的壁厚;而对于极限承载力受下弦管受拉屈服控制的B、C梁,则要增大下弦管的壁厚.上下弦管是否采用钢管混凝土对梁的受力性能与极限承载力有显著的影响.然而,管内混凝土的等级对梁的极限承载力影响很小.波形钢腹板应具有足够的厚度以避免其局部屈曲破坏.在保证这一板厚的前提下,波形板厚度对梁的承载力影响并不大,承载力计算中可以忽略其对梁的抗弯能力的贡献.

Nonlinear finite element analysis and parametric studies on concrete filled steel tubular beam with corrugated steel web

A 3-D finite element model is presented for a new composite structure-concrete filled steel tubular(CFST) beam with corrugated steel web.Using ANSYS program,dual-nonlinear finite element analyses for the tested specimens are conducted.The analysis result achieves good agreement with that of the experiment.It is indicated that for beam A,which is characterized by the local buckling of upper tube,the thickness of the upper tube should be increased to improve the load-carrying capacity,while for beam B and C,which is failed by the tensional yield of the lower tube,the thickness of the lower tube should be increased.The mechanical behavior and ultimate load carrying capacity of the beam are influenced significantly by the employment of CFST chord,but it is not necessary to use high strength concrete.It shows that if the thickness of the corrugated steel web is satisfied to avoid its buckling,its contribution to the load carrying capacity can be neglected.