The Comparison Of Seismic Provisions And Performance For Chinese Reinforced Concrete Moment Frames With American In High Seismic Risk Zone

The U.S. seismic code is developing rapidly in recent years. Promote and use a large number of achievements in the next-generation code which is represented by IBC, In addition, the United States, especially its western regions have abundant experience of earthquake damage. Therefore, this paper is comparing the provisions for largely used reinforced concrete moment frame in U.S next-generation seismic code with provisions in Chinese seismic code. Use of carefully calibrated and reliable non-linear dynamic analysis procedure FW-EPA for structural response dynamic analysis under rare earthquake and evaluate the safety of Chinese current seismic code. At the same time, through the comparative analysis between the relative level of seismic performance of Chinese and U.S moment frame, the seismic performance of Chinese moment frame can be indirectly evaluated by Learning from the Earthquake damage of RC moment frame in the actual U,S earthquake.Under the guidance of the ideas in this thesis, the following work is completed:①Introduce the ideas of seismic risk analysis and the technical methods for preparing the seismic risk zoning maps and maximum considered earthquake zoning maps in the U,S. Moreover, compare these ideas and methods with Chinese zoning maps, and propose the corresponding method for chooseing the design ground motion parameters in two country.②Complete the comparative analysis of seismic provisions for RC moment frame in Chinese and U.S seismic code. Analysis and evaluate the content of seismic design principles,design ground motion parameters,capacity design measures and seismic design details in the Chinese and U.S code;③Strictly execute the section design for Chinese and U.S RC moment frame at the site with fortified intensity of degree 9 and degree 8, the U.S RC moment frame adopt two structural pattern, one is using all frame as part of the seismic force-resisting system and the other is using dual systems that combine seismic force-resisting frame with gravity frame.④Complete the nolinear dynamic analysis for the RC moment frame during the rare earthquake and discuss the laws and reasons of the reaction.Through the above work, the main conclusions are:①Both the seismic risk analysis curves and the maximum considered earthquake ground motion parameters of U,S is given on each site. However, the method used in China is given representative value for each zone, this approach can not reflect the large number of seismic hazard analysis results,. Furthermore, the representative value is taken as the lower limit of ground motion parameter scope so that may lead to some hidden danger.②This paper propose that if the ground motion parameters with 10% probability of exceedence in 50 years at a American site is belong the parameter scope of one Chinese fortified intensity degree, then we consider that this site have the same seismic risk as this degree of Chinese fortified intensity.③For the example using all frame as part of the seismic force-resisting system, the response modification factor R using in U.S seismic code is larger than China. However, because U.S seismic design code is adopting more strict strong column weak beam measure and is considering the vertical seismic force , the quantity of reinforcement for U,S frame is as much as China.④Because there is no strengthening measures at the column bottom of underlayer, the seismic performance of U.S structure with all frame as part of the seismic force-resisting system under rare earthquake is weaker than China.⑤The seismic performance of U,S dual systems that combine seismic force-resisting frame with gravity frame is better than Chinese frame. however, it is waste of material and money.