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Residual Capacity of Axially Loaded Circular RC Columns after Lateral Low-Velocity Impact
| 题名： | Residual Capacity of Axially Loaded Circular RC Columns after Lateral Low-Velocity Impact |
| 正文语种： | 英文 |
| 作者： | Wei Fan, Aff.M.ASCE1; Bin Liu, S.M.ASCE2; Gary R. Consolazio, M.ASCE3 |
| 作者单位： | 1Associate Professor, Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan Univ., Changsha 410082, China; Visiting Professor, Dept. of Civil and Mineral Engineering, Univ. of Toronto, Toronto, ON, Canada M5S 1A4 (corresponding author). 2Ph.D. Candidate, College of Civil Eng., Hunan Univ., Changsha 410082, China. 3Professor, Engineering School of Sustainable Infrastructure and Environment, Dept. of Civil and Coastal Engineering, Univ. of Florida, P.O. Box 116580, Gainesville, FL 32611. |
| 关键词： | Residual strength; Postimpact behavior; Compression after impact (CAI) test; Finite-element simulation; Circular RC column |
| 摘要： | RC bridge columns that are at risk for collision loading must be designed for lateral impact load. Because bridge columns must also support axial loads, evaluating the residual axial capacity and collapse risk of impact-damaged columns is important. This study examined axial performance characteristics of RC columns using compression after impact (CAI) testing of twelve circular columns. As residual deformations caused by lateral impact loading increased, residual axial strengths were found to decrease. Additionally, damage modes induced by impact loading were found to have an obvious influence on residual axial capacity. Shear-dominated impact damage was observed to result in greater reduction of axial capacity than did flexure-dominated damage. Because the maximum load imposed during a collision is usually unknown, an assessment method based on the postimpact state (deformation and damage mode) is proposed and was demonstrated to be capable of predicting postimpact residual axial capacity. The effects of reinforcement ratio and axial load ratio on postimpact capacity were parametrically investigated, and an empirical formula derived from the results was developed for estimating residual strengths. |
| 出版年： | 2019 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | 145 |
| 期： | 6 |
| 页码： | 1-16 |
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