DYNAMIC ANALYSIS OF MINDLIN PLATE RESTING ON VARIABLE STIFFNESS FOUNDATION SUBJECTED TO MOVING LOAD USING MOVING ELEMET METHOD

ABSTRACT
In this paper, dynamic analysis of the Mindlin plate resting on variable stiffness foundation subjected to moving load is carried out. The foundation is modeled by damping viscous and elastic springs, in which the stiffness of the springs is variable along the length of the plate. Moving Element Method (MEM) is used to analyze the dynamic response of the plate. By using this method, a plate is discretized into “moving elements”. These moving elements are not physical elements fixed to the plate but are conceptual elements that “flow” with the moving load through the plate. The main advantage of MEM is that the load will never reach the boundary end since the proposed elements move along with it and the moving load will not even have to cross from one element into another, thereby avoiding the updating of the force or the displacement vectors. The governing equations of motion are derived by the principle of virtual work and solved by the Newmark method. The properties of the variable stiffness foundation, the velocity of moving load and the elastic modulus of the plate are investigated, and the results show that these factors have important effects on the dynamic response of the plate.
Keywords: Variable stiffness foundation, dynamic response, moving element method, moving load.
KS. Nguyễn Hoàng Thế
Học viên Cao học, Khoa Kỹ thuật Xây dựng, Trường Đại học Bách khoa – Đại học Quốc Gia TP.HCM
PGS. TS. Lương Văn Hải
Khoa Kỹ thuật Xây dựng, Trường Đại học Bách khoa – Đại học Quốc Gia TP.HCM
Email: [email protected]
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