Analysis of dynamic reduction coefficient for steel-concrete composite beams
HOU Zhongming1 , XIA He2 , WANG Yuanqing1, ZHANG Yanling3
1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China;2.School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;3. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
Abstract：Considering the slip between steel girder and concrete slab, the fundamental governing motion equations of simply-supported steel-concrete composite beams are deduced and analyzed. On the above basis, considering the different mechanical characteristics from common bridges, the “dynamic stiffness reduction factor” and “frequency reduction factor” applicable to the dynamic calculation for the dynamic calculation of composite beams are proposed and compared with that in the Code for design of steel structures. Then the equivalent expression of composite beams is given. The study shows that the static expression from the Code for design of steel structures is not applicable to the calculation of dynamic equivalent stiffness, otherwise will cause obvious error.
2015, Vol. 34 
