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根据钢筋混凝土联肢剪力墙复合配筋连梁在低周反复加载试验下的受力特征分析,在合理化假定基础上,该文发展了适用于模拟跨高比L/h≤1.5复合配筋连梁受力性能的超静定拉杆-压杆模型,该模型由包含对角斜向混凝土压杆、对角斜向钢筋压杆和对角斜向钢筋拉杆的主斜拉杆-压杆模型、以及包含菱形筋双肢和混凝土次斜压杆的菱形筋桁架模型组成。该文定量地确定了两类混凝土斜压杆变形与梁端侧移的关系,进而根据杆件间的变形规律建立起各拉杆和压杆的几何方程和变形协调方程,然后取各杆件为脱离体进行受力状态分析,得到杆件受力与变形之间的关系,最终在梁端截面位置建立起力总体平衡方程。共31个计算式的迭代计算结果与试验结果对比表明,该模型能较好地反映跨高比L/h≤1.5复合配筋连梁从开裂到失效全过程受力性能。
According to the analysis of the force characteristics of the composite reinforced concrete connecting beam with composite reinforced girder under low cyclic loading test, on the basis of reasonable assumptions, this paper developed a method suitable for simulating the composite reinforcement with L / h≤1.5 Bending rod-strut model for the behavior of coupled beams, consisting of a model of a primary diagonal tie-strut containing diagonal concrete struts, diagonal diagonal rebar struts and diagonal diagonal rebar struts, Diamond-shaped tendons and concrete secondary bar diagonal rib truss model. This paper quantitatively determines the relationship between the deformation of two types of concrete bar and the lateral displacement of the beam end, and then establishes the geometric equation and the deformation coordination equation of each bar and bar according to the deformation law between bars. Then, The detachment is subjected to stress state analysis, and the relationship between the force and deformation of the rod is obtained. Finally, the general equilibrium equation of force is established at the cross-section of the beam end. A total of 31 calculations of the iterative calculation results and test results show that the model can better reflect the span ratio L / h ≤ 1.5 composite girder from cracking to failure of the whole process of mechanical properties.