简支叠合梁抗弯性能非线性分析

摘要

In order to analyze bending whole process of composite laminated beam more accurately, considering nonlinear constitutive relation of various materials, a new laminated beam element was formulated based on classical lamination theory and finite element method. The laminated beam element stiffness equation was obtained. The bending whole process of a steel-concrete composite test beam and concrete beams strengthened with carbon under vertical load were analyzed by step loading method. It was validated by experiments that the calculated results of composite beam deflection had a good agreement with test results. It is concluded that this equation is rational and believable, and the equation provides a feasible design theory for practical engineering calculation, and the research provides a new method for theoretical research of composite beam.%为了准确分析复和材料叠合梁的受弯全过程，考虑到组成叠合梁的各种材料非线性本构关系，基于经典层合理论和有限元基本思想，建立了一种新型层合梁单元，得到了该种类型单元的刚度方程。采用分步加载法进行了钢-混凝土组合试验梁及碳纤维加固混凝土梁在竖向荷载作用下的受弯全过程分析。经过试验验证，复合梁挠度的计算值与试验值有较好的一致性。