KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Dynamic Behavior of Composite Material Laminated Plates under Moving Loads

이동하중을 받는 복합재료 적층판의 동적거동특성

Chun, Kyoung-Sik;Ji, Hyo-Seon;Chang, Suk-Yoon
천경식;지효선;장석윤

  • Published : 2004.01.31

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Abstract

In this paper, an analytical study is performed in order to investigate the characteristics of dynamic behavior of composite material laminated plates under moving loads. A formulation of a dynamic equilibrium equation of the laminated composite structures is presented. In the finite elements, modeling is established by the combined use of the addition of non-conforming displacement modes, assumed shear strain and improved shear stiffness. The mode superposition and Newmark direct integration method, adopted to perform time integration from step to step, are applied for dynamic analysis of Plates under moving load. Parametric studies for the effects of moving load, velocity, lamination scheme, stacking sequence, and fiber angle are carried out. The results in numerical analyses are compared with displacement, stress, influence surface, and dynamic magnification factor for laminated composite structures during moving load. It is found that the dynamic responses of the laminated plate are significantly varied by the effect of dynamic interaction between the moving velocities and the total stiffness of composite materials. The various results through numerical analysis are presented to use as a basic data in order to develop and grasp the behavior of all composite material bridges.

본 연구에서는 이동하중을 받는 복합재료 적층판의 동적거동특성을 파악하였다. 비등방성 복합재료 적층판의 동적평형방정식을 정식화하고, 비적합 변위모드와 가정된 전단변형률장 및 개선된 전단강성행렬을 갖는 유한요소을 사용하여 모델링하였다. 이동하중에 의한 동적거동은 시간에 관한 운동방정식의 적분과 시간이력을 해결하기 위해 모우드 중첩법과 Newmark 직접적분법을 사용하여 해석하였다. 이동하중의 속도, 적층수, 적층배열, 화이버 보강각도 등의 매개변수 변화에 따른 적층판의 처짐과 응력에 대한 영향면 및 동적확대계수를 비교, 분석하였다. 이동속도와 복합재료의 강성변화에 따른 상호작용은 적층판의 동적응답에 상당한 영향을 주었다. 본 연구에서 제시한 수치해석 결과는 완전 복합신소재 교량 바닥판의 거동을 이해하고 개발하는데 있어서 기초자료로써 도움이 될 것으로 기대된다.

Keywords

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