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对梁-钢桁梁混凝土组合节点提出理论模型。对典型的腹板和底座的节点进行研究,以定义其弯矩-转动性能,包括初始刚度、抗弯强度和旋转能力。借助于4个考虑混凝土刚度和裂缝演化参数的幂函数,所提出的理论模型描述了节点的半刚性响应,并考虑混凝土板拉伸刚度的影响。将理论模型与4个十字型试验结果进行对比,其中分别为两个考虑和不考虑腹板角度的节点,很好地验证了所提出的弯矩-转动模型,并表明腹板角度对混凝土开裂过程有很大的影响。同时,试验结果证实了组合半刚性节点,混凝土开裂前和裂缝稳定后的作用以及腹板连接的螺栓实际效应和板中的剪力滞后效应等基本假设。
The theoretical model of beam-steel truss girder concrete composite joints is proposed. A typical web and base node is studied to define its moment-rotation behavior, including initial stiffness, flexural strength, and rotational ability. With the help of four power functions which take into account the stiffness of concrete and the evolution parameters of the crack, the proposed theoretical model describes the semi-rigid response of the joint and considers the effect of the tensile stiffness of the concrete slab. Comparing the theoretical model with the results of four cruciform tests, two of which are considered and do not consider the angle of the web respectively, the proposed bending moment-rotation model is well verified and the cracked concrete angle is indicated by the web angle The process has a huge impact. At the same time, the experimental results confirm the basic assumptions of combined semi-rigid joints, pre-concrete cracking and crack stabilization, as well as the actual effect of the bolts connecting the webs and the shear lag effect in the slab.