预制混凝土板式拼装综合管廊嵌入式节点转动刚度非线性有限元分析

Nonlinear Finite Element Analysis of Rotational Stiffness of Precast Concrete Slab-assembly Utility Tunnel with Embedded Joints

基于ABAQUS软件,并考虑材料非线性、预制拼缝界面以及钢筋锚固长度的影响,建立预制混凝土板式拼装综合管廊侧板-底板嵌入式节点在侧向加载下的有限元模型,并通过与试验结果的对比,验证了该模型的合理性。在此基础上,开展了有限元参数分析,主要分析参数包括腋角高度、嵌入深度、外壁厚度等,结果表明:与现浇节点相比,嵌入式节点的承载力相对比值在0.8~0.85,初始转动刚度相对比值在0.8~0.9,屈服时转动刚度相对比值在0.5~0.6,后期转动刚度相对比值在0.1~0.2;与现浇节点相比,侧板厚度的增加对嵌入式节点的初始转动刚度相对值、屈服时转动刚度相对值、后期转动刚度相对值均有提升,而腋角高度、嵌入深度主要影响屈服和后期转动刚度相对值。

With the finite element software ABAQUS,considering material nonlinearity,precast concrete assembly seam interface and reinforced anchorage length,the finite element model of the side panelbottom embedded joints of precast concrete slab-assembly utility tunnel was established. Compared with the results of the field test,rationality of the model was verified. And the factors including haunch height,embedded depth and the side thickness were included in the finite element analysis. The results show： compared with the cast-in-place joint,the relative ratio of the bearing capacity of the embedded joint is around 0. 8 - 0. 85,the relative ratio of the initial rotational stiffness is about 0. 8 - 0. 9,the relative ratio of yielding rotational stiffness is about 0. 5 - 0. 6,and the relative ratio of post rotational stiffness is about 0. 1 - 0. 2. The increase of the side thickness can improve the relative ratio of the initial rotational stiffness,yielding rotational stiffness and post rotational stiffness. The haunch height and embedded depth mainly influence the relative rotational stiffness after yielding.