钢筋混凝土叠合梁斜截面承载力数值模拟与影响因素分析

Numerical Simulation of Shear Resistance of Reinforced Concrete Composite Beam and Analysis on Affecting Factors

钢筋混凝土叠合梁的斜截面承载力,从理论上定量分析存在着较多困难,但数值模拟分析是一种直接有效的途径.笔者对33根尺寸、配筋相同,叠合参数及混凝土强度不同的无腹筋叠合梁和1根整浇对比梁用ABAQUS进行了非线性有限元数值模拟,并且分析了叠合参数以及混凝土强度对叠合梁斜截面承载力的影响,给出了斜截面承载力的计算公式.该分析结果表明,叠合梁的斜截面承载力是整浇梁的1.00～1.14倍.所获分析结果对于促进叠合梁斜截面理论的深入研究、指导叠合梁在工程中的合理设计以及类似的数值模拟分析均有一定的参考价值.

Due to difficulties with quantitative analysis in theory on shear resistance of reinforced concrete composite beam, numerical simulation becomes a direct and efficient approach. 33 composite beams, which are same in dimensions and bar arrangement but different in composite parameters and strength grade of concrete, and one cast-on-site concrete beam are analyzed by nonlinear mumerical simulation with ABAQUS.The impact of the composite parameters and strength grade of concrete on shear resistance of composite beam is discussed, and computational formulas for shear resistance are presented. The results indicate that shear resistance of composite beam accounts for 1.0-1.14 times of that of cast-on-site concrete beam. The results obtained could be referred in further study of computational theory of composite members, rational design of composite beams, and other similar numerical simulation.