SEISMIC BASE ISOLATION IN STRENGTHENING FRAME STRUCTURE OF MIDDLE SCHOOL TEACHING BUILDING IN ZHUONI-CHINA

Qasem Riyadh Ghaleb Abdulwahab, Sun Jianqin, Qi Jie

Abstract: Seismic isolation is a technique that has been used around the world to protect building structures, nonstructural components and content from the damaging effects of earthquake ground shaking. In this paper,frame structure concrete of middle school teaching building, the project from Zhuoni County Middle School Center of the Gannan city is located in the southeast part of Gansu province in China. The frame structure used PKPM software in the design and Sap2000 was used to remodel the structure, analyze and then applied the seismic base isolation. This teaching building has been strengthened to be fortified against ultimate bearing capacity failure as it is an existing structure. The lead rubber bearing, Isolators, LRB400, NRB400 and LRB500, the modal and time history analysis of isolated structure and non isolated structure were carried out, and the analysis results of two structures were being compared. The results show that the natural vibration period of the structure can be effectively prolonged and the shear forces and displacement between layers can be reduced effectively after the structural isolation bearings are arranged. Analysis and comparison of the isolated structure and non isolated structure of their shear forces, acceleration and displacement seismic, found that isolation structure can significantly reduce the shear forces and acceleration and increased displacement. Structure’s of Seismic response improves the structure seismic fortification level, which proves that the shock absorption effect is good.

Keywords: Frame structure; Isolation structure; Lead rubber bearing; and Time history analysis.

DOI: https://doi.org/10.15623/ijret.2017.0612017