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Structural Engineering and Mechanics
  Volume 6, Number 1, January 1998 , pages 63-76

Dynamic responses of structures with sliding base
Tsai JS, Wang WC

    This paper presents dynamic responses of structures with sliding base which limits the translation of external loads from ground excitation. A discrete element model based on the discontinuous deformation analysis method is proposed to study this sliding boundary problem. The sliding base is simulated using sets of fictitious contact springs along the sliding interface. The set of contact spring is to translate friction force from ground to superstructure. Validity of the proposed model is examined by the closed-form solutions of an idealized mass-spring structural model subjected to harmonic ground excitation. This model is also applied to a problem of a three-story structural model subjected to the ground excitation of 1940 El Centro earthquake. Analyses of both sliding-base and fixed-base conditions are performed as comparisons. This study shows that using this model can simulate the dynamic response of a sliding structure with frictional cut-off quite accurately. Results reveal that lowering the frictional coefficient-of the sliding joint will reduce the peak responses. The structure responses in little deformation, but it displaces at the end of excitation.
Key Words
    sliding structure, sliding boundary problem, discontinuous deformation analysis
Tsai JS, Natl Cheng Kung Univ, Dept Civil Engn, Tainan 70101, Taiwan
Natl Cheng Kung Univ, Dept Civil Engn, Tainan 70101, Taiwan

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