Natural vibration characteristics of steel-concrete composite beams with axial variable stiffness based on dynamic direct stiffness method
SUN Qikai1,3, ZHANG Nan1,3, LIU Xiao1,3, TAO Xiaoyan2,3, WANG Zhangming1, GONG Yiming1
1.School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
2.Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China;
3.State Key Laboratory for Track Technology of High-Speed Railway, Beijing 100081, China
Abstract：The finite element (FE) calculation model for natural vibration characteristics of a steel-concrete composite beam based on dynamic direct stiffness method was derived considering shear-slip effect between concrete slab and steel beam, and the element dynamic stiffness matrix with 6-DOF was obtained. The solving process for natural vibration characteristics of a steel-concrete composite beam with general elastic supports was deduced. As no approximate displacement field or force field was introduced in derivation process of the model and it could be used to analyze steel-concrete composite beams with general elastic supports and variable stiffness in axial direction, the calculation results were accurate. Finally, through laboratory tests of a two-hole simply supported steel-concrete composite beam, the correctness of the FE calculation model was verified by comparing the calculation results of theoretical analysis, ANSYS and the derived FE model with test results. Meanwhile, the application scope of the FE calculation model was further verified by referring to the calculation results of the simply supported beam numerical model published in literature under 4 common boundary conditions of simply supported-simply supported, fixed-free, fixed-simply supported and fixed-fixed. The results showed that the derived dynamic direct stiffness matrix can be used to solve natural vibration characteristics of steel-concrete composite beams with axial variable stiffness under general elastic boundary conditions.
孙琪凯，张楠，刘潇，陶晓燕，王章明，龚怡明. 基于动力直接刚度法分析轴向变刚度钢-混组合梁自振特性[J]. 振动与冲击, 2021, 40(15): 296-302.
SUN Qikai, ZHANG Nan, LIU Xiao， TAO Xiaoyan, WANG Zhangming, GONG Yiming. Natural vibration characteristics of steel-concrete composite beams with axial variable stiffness based on dynamic direct stiffness method. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(15): 296-302.
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