EFFECTS OF REINFORCEMENT RATIOS ON DYNAMIC BEHAVIOR OF RC COLUMNS CONSIDERING STRAIN RATE
The precise prediction of mechanical properties and behavior of reinforced concrete (RC) columns under dynamic loadings such as severe earthquakes or strong winds is crucial to aseismic design of civil engineering structures. In traditional aseismic design code, the effect of strain rate on materials strength, load carrying capacity, deformation, energy dissipation capacity and failure mode of structural members are not be considered properly. Even tests on dynamic behavior of RC columns and shear walls structures under high strain rate has recently been carried out, there is a far way to accumulate enough test results to understand the dynamic performance of RC structures and members. Reinforcement ratio is one of the several variables the influence the behavior of the RC column. In this study, numerical simulations on the dynamic behavior of a typical RC column specimen under dynamic loading were performed. A recently developed constitutive model of concrete considering the strain rate effect was introduced into a dynamic fiber model to characterize the nonlinear strain rate dependent behavior of concrete. The developed dynamic fiber element model is validated by comparing the simulated results of RC column specimens with the test results reported in related literatures. Then the dynamic properties of the RC column considering the influence of reinforcement ratio were simulated. Results show that the developed fiber element model can predict the behavior of RC columns with acceptable accuracy. Using the developed model, the affect of various longitudinal reinforcement ratios and volumetric stirrup ratios load carrying capacity is investigated.
reinforced concrete columns reinforcement ratio strain rate effect parametrical analysis numerical simulation fiber model method
Bin Xu Liang Tang Ye-Ping Long
College of Civil Engineering, Hunan University, Yuelu Mountain, Changsha, Hunan 410082, P.R. China K College of Civil Engineering, Hunan University, Yuelu Mountain, Changsha, Hunan 410082, P.R. China
国际会议
广州
英文
524-529
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）