Model Test and Numerical Simulation Research on Reasonable Structure of Steel-Concrete Composite Section in Space Rigid Frame

doi:10.3969/j.issn.1674-0696.2021.04.12

Abstract

Abstract: Based on a steel-concrete composite section in space rigid frame structure, a static load test of 1∶2 large-scale segment model was completed according to the principle of “stress equivalence”. Meanwhile, a precise finite element model considering contact nonlinearity and shear stiffness was established. On the basis of good coincidence between theoretical calculation and model test, the influence of different shear stiffness and structural details of PBL shear key on the mechanical characteristics of the joint section was discussed. The research results show that in the original design structure, the shear stiffness has limited influence on the calculation results, and the setting of bearing plate has significant influence on the magnitude and distribution rule of stress. The combination of bearing plate and shear key can achieve ideal comprehensive effect.

Key words: bridge engineering, space rigid frame, steel-concrete composite section, shear stiffness, bearing plate, finite element analysis

摘要： 依托某空间刚架结构钢-混结合段为工程背景，按照“应力等效”原则完成了1∶2大比例节段模型的静载试验，同时，建立了考虑接触非线性和剪切刚度的精细有限元模型。在理论计算和模型试验吻合较好的基础之上，探讨了PBL剪力键不同剪切刚度和构造细节对结合段受力特点的影响。研究结果表明：在原设计构造下，剪切刚度对计算结果影响有限，承压板的设置情况对应力大小及分布规律影响显著。将承压板和剪力键配合使用，能达到较理想的综合效果。

关键词: 桥梁工程, 空间刚架, 钢-混结合段, 剪切刚度, 承压板, 有限元分析

CLC Number:

SU Xiaobo1, XIAO Lin2. Model Test and Numerical Simulation Research on Reasonable Structure of Steel-Concrete Composite Section in Space Rigid Frame[J]. Journal of Chongqing Jiaotong University(Natural Science), 2021, 40(04): 76-82.

苏小波1，肖林2. 空间刚架结构钢-混结合段合理构造模型试验和数值模拟研究[J]. 重庆交通大学学报（自然科学版）, 2021, 40(04): 76-82.

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