The concept of full ductility is commonly used to design reinforced concrete frames.This concept may not work well where strong earthquakes impose restricted ductility demands.Examples include structures governed by g...The concept of full ductility is commonly used to design reinforced concrete frames.This concept may not work well where strong earthquakes impose restricted ductility demands.Examples include structures governed by gravity loads or wind loads.In this study,shake table tests are conducted on a 3-story intermediate RC frame.The frame is gradually subjected to a sequence of nine excitation records varying from 0.10 g to 0.60 g.It is assumed that the intensities below 0.35 g are minor,between 0.40 g and 0.50 g are moderate,and 0.55 g and 0.60 g are large earthquakes.Results show that the frame remains elastic and experiences hair cracks under minor and moderate earthquakes.Under large earthquakes,the thickness,number,and depth of cracks are increased,and the maximum inter-story drift ratio of the frame does not exceed a relatively safe value of 1.57%.Damage distribution shows that cracks are not localized in a specific area at the end of members but are distributed along the spans of both beams and columns,while beam-column joints remain almost uncracked.The observations indicate a relatively satisfactory performance of the intermediate frame under the assumed large earthquake.展开更多
文摘The concept of full ductility is commonly used to design reinforced concrete frames.This concept may not work well where strong earthquakes impose restricted ductility demands.Examples include structures governed by gravity loads or wind loads.In this study,shake table tests are conducted on a 3-story intermediate RC frame.The frame is gradually subjected to a sequence of nine excitation records varying from 0.10 g to 0.60 g.It is assumed that the intensities below 0.35 g are minor,between 0.40 g and 0.50 g are moderate,and 0.55 g and 0.60 g are large earthquakes.Results show that the frame remains elastic and experiences hair cracks under minor and moderate earthquakes.Under large earthquakes,the thickness,number,and depth of cracks are increased,and the maximum inter-story drift ratio of the frame does not exceed a relatively safe value of 1.57%.Damage distribution shows that cracks are not localized in a specific area at the end of members but are distributed along the spans of both beams and columns,while beam-column joints remain almost uncracked.The observations indicate a relatively satisfactory performance of the intermediate frame under the assumed large earthquake.
