International Journal of Earth Sciences and Engineering

Yuan Kang ¹, Li Yingmin ¹, Tian Wan ¹, Guo Junlin ²

Affiliations
1 College of Civil Engineering, Chongqing University, Chongqing-400045, CN
2 College of Hydraulic and Civil Engineering, Shihezi University, Shihezi Xinjiang-832003, CN

Abstract

In view of the phenomenon that the earthquake disaster and frost heaving of foundation are the main threats for low rise rural building, a new type of simplified composite isolation system for rural building which could not only play a seismic isolation role but also resist frost heave force has been put forward in this paper. Firstly, the composite isolation structure’s seismic dynamic equations have been deduced, and its isolation mechanism has been analyzed by the seismic response spectrum theory. Then, the elastoplastic time-history dynamic analysis of four kind structures including traditional seismic structure, sliding isolation structure, sand cushion isolation structure and composite isolation structure have been executed by ABAQUS software, and four kind structures’ dynamic response characteristics of acceleration, displacement and structural damage under rare earthquake action have been compared. Theoretical analysis and numerical simulation have drawn the same conclusions. The research results prove that the composite isolation system has a good seismic energy dissipation effect, and the greater of the earthquake input and the smaller of the friction coefficient of sliding layer can bring about more obvious isolation effect. Compared with sliding isolation structure, the acceleration response of composite isolation structure is decreased slightly, but the sliding displacement response is reduced significantly, so the deformation and restoration ability demands of limit device has been decreased.

Keywords

Rural Building, Composite Isolation System, Theoretical Analysis, Numerical Simulation.

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Yuan Kang ¹, Bai Hongsi ², Dai Yufei ²

Affiliations
1 College of Civil Engineering, Chongqing University, Chongqing-400045, CN
2 College of Hydraulic and Civil Engineering, Shihezi University, Shihezi-832003, CN

Abstract

With the huge depth-width ratio and uneven distribution of lateral stiffness and mass, the super highrise building could not meet the premise of rigidity-gravity ratio formula provided by Chinese code “Technical specification for concrete structures of tall building (JGJ3-2010)”, so it’s overall stability has been concerned widely. According to the principle of overall stability which is evaluated by rigidity-gravity ratio, the corrected method to rigidity-gravity ratio was deduced in this paper. The corrected method was used for an engineering example, its result was compared with P-delta effect calculation and buckling analysis, the consistent conclusions were obtained. The researches show that the calculation of rigidity-gravity ratio should consider the influence of actual gravity load and horizontal load distribution forms, the overall stability of super high-rise building should be comprehensively evaluated through the corrected rigidity-gravity ratio checking, P-delta effect calculation and Integral buckling analysis.

Keywords

Super High-Rise Building, Overall Stability, Rigidity-Gravity Ratio, P-Delta Effect, Buckling Analysis.

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