Verification Based On Inelastic Dynamic Analysis For Availability Of Seismic Regulation Revised Of Reinforced Concrete Framework

Inelastic dynamic analysis can't be substituted in verifying performance of dynamic response of seismic structure. The government criterion which guides seismic design of structure should refer to the calculational result of inelastic dynamic analysis with multi-waves import,which is gotten by tested analytic program,besides referring to the structure experiment and experience on seismic disaster when it establishes corresponding structural seismic design rules,measures and detailings.Chinese seismic design code has adopted the popular seismic design concept in the world,that is,using reasonable combination of "Seismic design force-Ductility grade" and the concept of "Capacity Design" to set up an ideal energy-dissipation mechanism behaving inelastic dynamic response characters to resist given seismic intensity.In the concepts mentioned above,the adjusting coefficient of moment capacity of column-to-beam is key to guide framework to come into being the structure of Strong column-to-Weak beam. As so far,these design measures,basing on structure experiments and seismic disaster,of Strong column-to-weak beam in Chinese seismic design code are made by referring to reliable foreign seismic criterion. Chinese design code differs from all other countries' in some aspects. The measures mentioned above mostly rely on experience and lack the systemic calculational result of inelastic dynamic analysis of structure.The research group which the author takes part in starts the series of analysis with the support of government nature-science fund projects. Several postgraduates have verified the measures of old design of GBJ 10-89 and GBJ 11-89 and have found obvious shortages for grade 2 intensity-category 8. The main task of the thesis is to judge availability of corresponding seismic measures after code revise through processing inelastic dynamic analysis with the method of multi-waves import for these framework of grade 1 and 2 intensity-category 8 and of grade 1 intensity-category 9 designed in terms of the revised criterions of GB 50011-2001 and GB 50010-2002.The results show that over-reinforcement of beam because of detailing is the most important reason disturbing framework from forming effective energy-dissipation mechanism. So,the method,that is,determining adjusting coefficient of moment capacity of column-to-beam according to actual reinforcement of beam,which have been adopted by framework of gradel intensity-category 8 and of grade 1intensity-category 9 can effectively form advantageous energy-dissipation mechanism under intermediate earthquake and rare earthquake. The enlarged adjusting coefficient of moment capacity of column-to-beam of grade 2 intensity-category 8 is not sufficient in despite of some enhancement of its value.The thesis verifies the availability of ductility detailings of elements prescribed by code through comparing the actual rotation capability of both ends of columns and beams obtained from inelastic dynamic analysis and the maximal rotation capability which columns and beams can possess through adopting the detailings in the code. Through the analysis of the thesis,it could be concluded that varied sections of column along height have a disadvantageous influence on the seismic response performance of structure,so does the design method that the columns in the upper storey,of which axial compression ratio is under 0.15,may be analyzed but not according to actual reinforcement of beam.