Seismic plastic design of self-centering prefabricated RC frame structures based on energy balance
To address the problems of weak connection,uncontrollable damage mechanisms,insufficient energy dissipation capacity and difficulty in post-earthquake repairing in precast concrete frame structures,based on the seismic design concept of energy balance,a seismic plastic design method was proposed for self-centering prefabricated concrete frame structures(SC-PRCF)equipped with controllable plastic hinges(CPH)by referring to the four level seismic fortification goals of earthquake resistant structures,and the difference in hysteresis behavior between self-centering structural systems and elastic-perfectly plastic structural systems and the insufficient plastic development of the upper floors in a structure was considered.A seven-story SC-PRCF was designed by the seismic plastic design method and a seven-story RCF was designed based on GB 50011-2010'Code for seismic design of buildings'as a counterpart.The effectiveness of the plastic design method and the advantages of SC-PRCF structures were verified through dynamic elasto-plastic analysis.The results indicate that the SC-PRCF structure can meet the seismic fortification goals of'no damage in small and moderate earthquakes,repairable in rare earthquakes and no collapsing in extremely rare earthquakes'according to the seismic plastic design method.Simultaneously,the failure mode of'strong column and weak beam'and the progressive yield mechanism can be achieved.All floors can participate in energy dissipation,and the failure path can be extended to avoid the occurrence of weak floors.
国家科技期刊平台
NSTL
万方数据
