腐蚀钢筋混凝土桥墩的抗冲击力学性能影响因素分析  

Analysis on effect factors of lateral anti-impact properties of the corroded reinforced concrete pier

作　　者：袁智杰[1] 方从启[1] 杨帅[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《混凝土》2017年第10期62-67,共6页Concrete

基　　金：国家自然科学基金项目(51178264);铁道部科技研究开发计划项目(J2011G003)

摘　　要：海洋环境下受腐蚀桥墩的抗冲击力学性能对全桥的安全性和耐久性影响极大。运用显式动力学软件LS-DYNA分别从撞击物质量、接触面形式和混凝土抗压强度三个方面分析了桥墩抗侧向冲击的力学性能。结果表明:当冲击物块质量从65.3 kg增加到145.3 kg,损伤单元数量增加了131.7%,损伤单元数量与冲击物块的质量成线性关系;同等质量的冲击物块,凸面冲击物块由于与墩柱的接触面比较小,瞬时应力最大,凸面冲击的钢筋残余最大Von Mises应力比凹面的增加了79.1%;当混凝土抗压强度从25 MPa增加到45 MPa,钢筋的残余最大Von Mises应力降低了86.8%。The impact mechanical properties of corroded reinforced concrete bridge piers is very important to the safety and durability- of the whole bridge.The lateral anti-impact properties of the reinforced concrete pier in ocean environment were analyzed by using the dynamic explicit finite element software LS-DYNA.Besides, various effect factors of lateral anti-impact properties of the reinforced con- crete pier were analyzed, for example, impact mass, the type of impact contact surface, concrete strength.It was shown that the number of damage unit increased by 131.7% when impact mass increased from 65.3 kg to 145.3 kg, the number of damage unit showed a linear relationship with the impact mass.Reinforced residual maximum Von Mises stress of convex objects was higher 79.1% then that of con- cave objects.Reinforced residual maximum Von Mises stress of convex objects was decreased by 86.8% as concrete strength increased to 45 MPa from 25 MPa.

关 键 词：钢筋混凝土 桥墩 海洋环境 冲击 力学性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]