Comparison Of Seismic Performance Of RC Frame Structures With And Without Viscous Damper Designed To China And US Seismic Code

The collapse of building structures under major seismic excitation leads to huge economic losses and human casualties.In recent years,lessons learned from the earthquake-induced damage to building structures prompt researchers to investigate the seismic design specifications and to evaluate the overall seismic safety of existing building structures.Several countries seismic codes in the world take different measures for the purpose of safety and economical losses.The main objective of this research is to investigate and compare the collapse capacity of RC special moment frames designed to China and US seismic Codes and also to investigate the influence of using fluid viscous dampers.In order to achieve the above objective,the finite element models of three RC frame structure with three,six,and nine story building were developed using ETABS v17.Two analysis method were utilized namely nonlinear static pushover and fast nonlinear time history analysis.The nonlinear static pushover was performed for the RC frame structures without supplemental damping system to obtain the capacity curves for each building and then four damage limit states namely slight,moderate,extensive,complete were obtained based on the capacity spectrum.The seismic vulnerability curves were developed for each building for result comparison of the buildings designed to the two seismic codes.Fast nonlinear time history analysis was performed on the frame structures with and without fluid viscous dampers that positioned at different locations.The results obtained from capacity curves of each structure without dampers designed according to China and US seismic codes were compared based on the performance points and percentile damage probability as follow:a)The performance point for the three-story building based on china code was slightly higher than the one obtained for the US code while the damage probability percentile was in close range for the two codes.b)The performance point for the six-story building based on china code was considerably lower than the US code,while the percentile damage probability was in close range for the two codes.c)The performance point for the nine-story building based on china code was noticeably lower than the US code while the damage percentile was in close range for the two codes.The time history analysis results for each RC frame structures were analyzed based on the story drift ratios,base shear,fluid viscous dampers.a)The values of max story drift ratios,base shear,fluid viscous damper obtained for thethree,six and nine-story building based on China code provided lower values than thoseobtained from US code.Moreover,the fluid viscous positioned at corner proved to beeffective in reducing the story drift ratios and base shear than the middle once.The results obtained from the nonlinear static pushover and nonlinear time history analysis for the buildings designed to the two seismic codes were in close range to each other and the fluid viscous dampers proven to be effective in controlling the building seismic performance.