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The regulations and related contents regarding the minimum story shear for the seismic design of buildings issued in 'Code for seismic design of buildings' (GB 50011-2010) were briefly described. A comparison between Chinese code and other seismic design codes was carried out. The necessity and applicability of the minimum story shear issued by all these codes were discussed. The calculated base shear of a structure may depend on some parameters, such as the seismic intensity, characteristic period of site, structural periods, modes and damping ratios, etc. The relation among the story shear factor and these parameters were described herein in this paper. The responses to earthquake action and wind load of structures which were of different heights or located in different seismic regions may differ from each other. Some of the key parameters calculated for the seismic design of tall buildings as examples were given to identify that the regulations of the minimum story shear are necessary and implementable for the seismic safety of tall buildings. [ABSTRACT FROM AUTHOR]

The seismic resistance capability of RC frame structure was studied with incremental dynamic analysis (IDA) method in terms of the 4 performance objectives (frequent seismic design of class C, frequent seismic design of class B, non-yielding design under moderate earthquake and elastic design under moderate earthquake ). Taking frequent seismic design of class C as basis, results of IDA analysis indicate that both seismic measures and seismic design force are very important influencing factors on seismic performance. The RC frame structures that are designed strictly conforming to the Chinese seismic design code have enough safety margins and the performance level of 'noncollapse under rare earthquake' can be reached. When the fortification intensity is 6, improving seismic measures for frequent seismic design of class C or increasing seismic design force for moderate seismic design has little influence on seismic performance. When the fortification intensity is 7, the collapse resistance capability of RC structures designed under moderate seismic force can be improved obviously. When the fortification intensity is 8, both improving seismic measures and increasing seismic design force can significantly raise the seismic resistance capability of RC frame structure. Especially, designed under moderate earthquake, the RC frame structure can withstand PGA of 1 000 gal without collapse. [ABSTRACT FROM AUTHOR]