Comparative Study On Wind-Resistant Design Of Base-Isolated Buildings Between China And Japan

Seismic isolation technology is one of the most effective seismic control techniques and has achieved wide application in construction projects.There are also many areas with high seismic intensity and wind pressure in China,such as Xiamen and Shantou,where base-isolated buildings are prone to the problem of uncoordinated isolation design and wind resistance design.To address this problem,the wind resistance design of base-isolated buildings between China and Japan are comparatived and the problems related to wind response are studied.The main works of the this research are as follows:According to Chinese ‘Standard for seismic isolation design of building’(GB/T51408-2021)and Japanese ‘Guidelines for the wind-resistant design of seismically base-isolated buildings’ and other related codes,comparisons were made between Chinese wind-resistant design methods and Japanese one for base-isolated buildings in terms of design objectives,wind loads,calculation of wind response and safety evaluation.A design for wind-resistance was carried out in along-wind and cross-wind based on the codes of the two countries respectively for a sample building to illustrate the differences of design methods,and provided better compatibility between the seismic isolation design and the wind-resistant design.Suggestions for future research on wind resistance of base-isolated buildings are presented.In order to verify the accuracy of the IWL method and the simplified formula in the Code ‘Structural Loads of Buildings’(GB50009-2012)for the wind response and equivalent wind load of a base-isolated building,and to fully compare and research the differences between the wind response characteristics of a non-isolated and a isolated building,a comparative study is conducted based on an example by combining the FNA method and the LRC-IWL method.The results show that: the wind response calculated by the FNA method and LRC-IWL method are very close,which indicates that these methods are suitable for calculating the alongwind wind response of the base-isolated building.Both the IWL method and the LRC-IWL method can calculate the equivalent wind loads of bse-isolated buildings accurately,while the formula method leads to small results due to the assumption of uniform mass of the superstructure and a smaller peak factor.In order to clarify the differences of wind vibration response of base-isolated building calculated by three commonly used biaxial restoring force models of MSS,Casciati and Harvey and Gavin,three models were used to simulate the restoring force of lead-rubber bearing under horizontal uniaxial/biaxial displacement,comparing the differences of experimental or finite element results,and the differences of the displacement of base displacement,top displacement and top acceleration of a numerical example caculated by three models were analyzed.With the consideration of the simulation of biaxial coupling effect and the difference of wind vibration response,the biaxial restoring model is suggested to consider the influnce of biaxial coupling on wind vibration response of base-isolated buildings.