Abstract
In this paper, the mechanical characteristics and seismic performance of the bottom frame anti-seismic wall structure are analyzed. According to the calculation formula given in the code, the calculation and analysis of the four story store house with the bottom one story frame are carried out. Under the minimum material strength specified in the code, the floor stiffness ratio, equivalent stiffness, wall and frame seismic action of the bottom story are calculated. At the same time, the type, the material strength and the restrained anti-seismic wall are calculated. The results show that the number of the seismic walls has a great influence on the effective stiffness of the bottom floor, the stiffness ratio between floors, the seismic action of the wall and the seismic action of the frame column, and the key influencing factors are determined. The conclusions are as follows: by increasing the concrete strength of the seismic wall at the bottom, the stiffness of the bottom floor is increased; the strength of the block is increased, and the seismic shear allocated to the column is reduced; the number of the seismic wall has a great influence on the seismic action of the frame column at the bottom. The influence of the stiffness ratio between layers is small; the use of reinforced concrete seismic wall can optimize the stiffness ratio between layers, reduce the number of the wall, and provide a reference for the selection of engineering reinforcement scheme.
Highlights
IntroductionThe bottom frame--anti-seismic wall structure has the characteristics of "upper rigid-lower flexible" and "head heavy-foot light", which is an unfavorable structure form for anti-seismic
The bottom frame--anti-seismic wall structure has the characteristics of "upper rigid-lower flexible" and "head heavy-foot light", which is an unfavorable structure form for anti-seismic.From the statistical analysis of earthquake damage [1,2,3,4,5], it is found that among all kinds of earthquake damage, the collapse of the bottom frame is the most serious
This paper studies the seismic performance of this kind of structure, analyzes the influencing factors of the seismic performance of the bottom frame, prevents the continuous collapse and damage during the earthquake, provides a reference for the design methods and measures to improve the seismic capacity of new structures, and provides a theoretical basis for the seismic reinforcement methods of the bottom frame seismic wall structure built before the implementation of the code for seismic design of buildings (GB50011-2010)
Summary
The bottom frame--anti-seismic wall structure has the characteristics of "upper rigid-lower flexible" and "head heavy-foot light", which is an unfavorable structure form for anti-seismic. From the statistical analysis of earthquake damage [1,2,3,4,5], it is found that among all kinds of earthquake damage, the collapse of the bottom frame is the most serious. Limited to the current economic development level of our country, as well as the characteristics of the bottom frame anti-seismic wall house that can meet the needs of the large space at the bottom, convenient and flexible use, and relatively low construction cost, the demolition and resettlement house building with shops in the street commercial residence, office building, as well as some public buildings that need large space at the bottom, such as shops, hotels, post offices, hotels, banks, etc construction continues in China. This paper studies the seismic performance of this kind of structure, analyzes the influencing factors of the seismic performance of the bottom frame, prevents the continuous collapse and damage during the earthquake, provides a reference for the design methods and measures to improve the seismic capacity of new structures, and provides a theoretical basis for the seismic reinforcement methods of the bottom frame seismic wall structure built before the implementation of the code for seismic design of buildings (GB50011-2010)
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