• 대한기계학회논문집
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• 제15권1호
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• pp.11-18
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• 1991

본 연구에서는 각이 지게 주름잡힌 주름판 구조물(산형, 사다리꼴형, 장방형 주름판)의 강성을 해석 하고, 이 강성식들을 일원화하여 한개의 식으로 표현하여 주고 자 한다. 이론 해석은, 연결부에서의 각도가 변형중에 변하지 않는다는 가정하에, 등가의 직교이방성판의 강성식을 유도하였다. 또한, 이론적으로 얻어진 강성치를 진 동해석에 적용시킴으로서, 직교이방성판으로서의 주름판의 고유진동수를 구하였다. 그리고 이를 진동실험에서 얻은 결과 및 PC용 슈퍼 SAP에서 얻은 수치결과와 비교함으로 서 이론의 신뢰성을 입증하였다.

• Structural Engineering and Mechanics
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• 제52권1호
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• pp.51-73
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• 2014

A three-dimensional finite element model for the Jiashao Bridge, the longest multi-span cable-stayed bridge in the world, is established using the commercial software package ANSYS. Dynamic characteristics of the bridge are analyzed and the effects of structural system measures including the rigid hinge, auxiliary piers and longitudinal constraints between the girders and side towers on the dynamic properties including modal frequency, mode shape and effective mass are studied by referring to the Jiashao Bridge. The analysis results reveal that: (i) the installation of the rigid hinge significantly reduces the modal frequency of the first symmetric lateral bending mode of bridge deck. Moreover, the rigid hinge significantly changes the mode shape and effective mass of the first symmetric torsional mode of bridge deck; (ii) the layout of the auxiliary piers in the side-spans has a limited effect on changing the modal frequencies, mode shapes and effective masses of global vibration modes; (iii) the employment of the longitudinal constraints significantly increases the modal frequencies of the vertical bending modes and lateral bending modes of bridge deck and have significant effects on changing the mode shapes of vertical bending modes and lateral bending modes of bridge deck. Moreover, the effective mass of the first anti-symmetric vertical bending of bridge deck in the longitudinal direction of the fully floating system is significantly larger than that of the partially constrained system and fully constrained system. The results obtained indicate that the structural system measures of the multi-span cable-stayed bridge have a great effect on the dynamic properties, which deserves special attention for seismic design and wind-resistant design of the multi-span cable-stayed bridge.