建筑结构学报2018，Vol.39Issue(4)：82-90,9.DOI:10.14006/j.jzjgxb.2018.04.010
钢筋混凝土铰支约束梁抗冲击性能试验研究
Experimental study on impact behavior of hinged RC beams
摘要
Abstract
In order to study the impact resistance behavior of RC beams,a series of static loading tests and drop weight impact tests were carried out on hinged RC beams.Numerical simulations for the impact tests were carried out using LS-DYNA,and then extended parametric studies were conducted.The test results show that:the failure characteristics of the RC beam under impact loading and static loading conditions are evidently different.Under impact loading,local damage governed the impact resistance of the RC beams with increase in the impact velocity;the damage is also greatly accumulated under repeated impact loading.Under static loading,the RC beams sustain the external loading through large deformation as well as intensive and well-developed cracking.Both the test and simulation results show that:an increase of the longitudinal reinforcement in the tension zone of RC beam can directly improve the impact resistance of the RC beams when longitudinal reinforcement ratio is relatively low.However,with increase in the reinforcement ratio,the impact resistance of the RC beams is gradually governed by local failure.The numerical simulation results show that the relationship between the longitudinal reinforcement ratio and the critical energy dissipation of RC beam follows a parabolic trend.By comparing the static energy dissipation of RC beam and extended numerical results,it is suggested that 90％ of the static energy dissipation capacity can be taken as the critical energy dissipation when evaluating the impact resistance of RC beams.关键词
钢筋混凝土梁/低速冲击/落锤试验/抗冲击性能Key words
reinforced concrete beam/low velocity impact/drop weight impact test/anti-impact performance分类
建筑与水利引用本文复制引用
孟一,易伟建,黄方林..钢筋混凝土铰支约束梁抗冲击性能试验研究[J].建筑结构学报,2018,39(4):82-90,9.基金项目
国家自然科学基金项目(51378504). （51378504）
