钢混组合梁力学性能的研究

Study on Mechanical Properties of Steel-concrete Composite Beam

由于钢混组合梁形式较多,选取波纹钢腹板与平钢腹板组合槽形梁为研究对象,对两种形式的组合梁进行力学性能对比分析;以某试验梁为依托,建立平钢腹板和波纹钢腹板2种腹板形式的实体有限元模型并对其进行破坏加载,比较两者的截面应变分布、荷载-位移曲线、刚度,并对钢腹板全过程力学行为进行分析。结果表明:波形钢腹板对强度的影响并不明显,但平钢腹板极易出现屈曲破坏状态;波纹钢腹板混凝土槽形组合梁、平钢腹板混凝土槽形组合梁荷载-位移曲线总体上均具有显著的弹性阶段、弹塑性阶段、弱化阶段;平钢腹板组合梁在弹塑性阶段位移增长较快,弱化阶段强度下降速率较快;加载过程中,刚度、Mises应力均小于波形钢腹板。

There are many forms of steel-concrete composite beams.Taking a corrugated steel web and flat steel web composite slot-type beams as the study object,the mechanical properties of two kinds of composite beam are compared and analyzed.Relying on a test beam,the solid finite element modes of flat steel web and corrugated steel web are established.And the destruction and loading are carried out to compare the cross-section strain distribution,load-displacement curve and rigidity of the both.The mechanical behavior of the whole process of the steel web is analyzed.The results show that the influence of corrugated steel webs on the strength is not obvious.However,the flat steel webs are prone to buckling failure.On the whole,the load-displacement curves of the corrugated steel web concrete slot-type composite beams and the flat steel web concrete slot-type composite beams have the significant elastic stage,elastic-plastic stage and weakening stage.The displacement of flat steel web composite beams increases rapidly in elastic-plastic stage,and its strength decreases rapidly in weakening stage.The rigidity and Mises stress are all less than that of the corrugated steel webs in the loading process.