配置高强钢筋的铁路重力式桥墩抗震性能研究  

Study on Seismic Behavior of Railway Gravity Bridge Piers with High Strength Reinforcement

作　　者：陈兴冲[1,2] 付远雄 鲁锦华 CHEN Xingchong;FU Yuanxiong;LU Jinhua(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;National and Provincial Joint Engineering Laboratory of Road&.Bridge Disaster Prevention and Control,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州730070

出　　处：《兰州交通大学学报》2025年第2期1-7,18,共8页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(51768036);兰州交通大学青年基金(2021030)。

摘　　要：为研究高强钢筋对铁路重力式桥墩抗震性能的影响,设计制作了2个HRB500高强钢筋的桥墩模型和2个HRB335普通钢筋的桥墩模型进行拟静力试验,研究高强钢筋的不同配筋率对滞回曲线、骨架曲线、刚度特性、位移延性以及累积耗能等抗震性能指标的影响。研究结果表明:配置高强钢筋的桥墩塑性区高度增加,墩底混凝土剥落范围增大,钢筋外露现象更加明显,其破坏特征区别于普通钢筋混凝土桥墩;对比普通钢筋桥墩,高强钢筋等面积配筋桥墩的滞回曲线更加饱满,其水平承载力和耗能能力明显增大,极限位移和屈服位移提高,但位移延性轻微下降,随着配筋率的增加,桥墩的变形能力增强;而等强度配筋桥墩的残余位移和等效阻尼系数更小,其自复位性能越好,地震中损伤越轻,残余刚度有所增大,且极限角位移与普通钢筋桥墩一致,表明等强度配筋桥墩具有一定的抗倾覆性,有利于震后对桥墩进行修复及加固。In order to study the influence of high-strength steel bars on the seismic performance of railway gravity piers,pseudo-static tests were carried out on two pier models of HRB50o high-strength steel bars and two pier models of HRB335 common steel bars.The effects of different reinforcement ratios of high-strength steel bars on seismic performance indexes such as hysteretic curve,skeleton curve,stiffness,displacement ductility and cumulative energy dissipation were studied.The results show that the height of plastic zone of bridge pier with high strength steel bar increases,the spalling range of concrete at the bottom of pier increases,and the phenomenon of steel bar exposure is more obvious,and its failure characteristic is different from that of ordinary reinforced concrete piers.Compared with ordinary reinforced piers,the hysteretic curve of high strength steel piers with equal area reinforcement is fuller,its horizontal bearing capacity and energy dissipation capacity increase obviously,ultimate displacement and yield displacement increase,but displacement ductility decreases slightly,with the increase of reinforcement ratio,the deformation capacity of bridge piers increases.On the other hand,the residual displacement and equivalent damping coefficient of the equal strength reinforced piers are smaller,the better the self-reset performance is,the lighter the damage is in the earthquake,and the residual stiffness increases,and the ultimate angular displacement is consistent with that of the ordinary reinforced piers,which shows that the equal strength reinforced piers have a certain resistance to overturning,which is beneficial to the repair and reinforcement of the piers after the earthquake.

关 键 词：铁路重力式桥墩 高强钢筋 拟静力试验 抗震性能 

分 类 号：U24[交通运输工程—道路与铁道工程]