Study of Controlling Vertical Structural Stiffness for the Frame Structure Supported By Foundations With Different Elevations

Abstract eng:
Foundations located at different elevations will result in vertical structural irregularities of mountain structures. Usually, the vertical structural irregularities can be reduced through the control of vertical structural stiffness. The special seismic response of mountain structures lead to the failure of existing Chinese codes of controlling the vertical structural irregularities. This paper describes the methods of controlling vertical structural irregularities of mountain structures, which would result in better seismic performance of mountain structures. Based on existing methods of controlling vertical structural stiffness, mechanical characteristics of mountain structures, theoretical derivation and engineering experience, this paper offers three methods of controlling vertical structural stiffness in order to reduce the vertical structural irregularities: 1) mutual control with intra-story to story stiffness ratio; 2) equivalent stiffness ratio; 3) corresponding part stiffness ratio. The comparisons among methods pertinent to the performances of frame structure supported by foundations with different elevations (FSSFDE) are demonstrated.

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