DYNAMIC BEHAVIOR SIMULATION OF REINFORCED CONCRETE COLUMNS WITH FIBER MODEL CONSIDERING STRAIN RATE EFFECT
It has been widely recognized that behavior of reinforced concrete (RC) structures or members under static and dynamic loadings is different. But the strain rate effect on the performance of RC members is not properly considered in most of the current design code for RC structures, which might be one of the possible reasons why real RC structures failed in an unexpected pattern. In order to precisely describe the nonlinear behavior of RC structures under severe earthquakes or strong winds, it is critical to introduce the strain rate effect in the constitutive mode of materials. With the limit in test techniques and facilities for high speed load test for engineering structures, even efforts have been made to test structural members and structures under dynamic loadings, rather scare test results on rate effect are available. In this study, a dynamic fiber model with the consideration of strain rate effects in the constitutive model of concrete is proposed to forecast the dynamic performance of RC column specimens which had been experimentally studied with static test. The dynamic monotonic properties of the RC columns under different axial compression ratios and different load rate levels were simulated using the developed dynamic fiber element model considering the influence of strain rate. When the load rate reaches a certain level, there is obvious increase in the lateral load capacity. Then, the developed dynamic fiber element model is validated by comparing the simulated results on two RC column specimens under different axial compression ratios with the test results reported in related literatures. Results show that the forecast load carrying capacity and deformation curves meet well with the test results. The developed fiber element model provides a convenient way to forecast the behavior of RC columns under different load rate. Numerical simulations results show that loading rate has obvious effect on the behavior of RC columns when the load rate reaches a certain level.
reinforced concrete columns dynamic loading strain rate effect numerical simulation fiber model method
Bin Xu Ye-Ping Long
College of Civil Engineering, Hunan University, Yuelu Mountain, Changsha 410082, P.R. China Key Labo College of Civil Engineering, Hunan University, Yuelu Mountain, Changsha 410082, P.R. China
国际会议
广州
英文
518-523
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）