氯盐腐蚀混凝土桥墩抗侧向冲击性能研究  

Concrete piers resistance to lateral impact properties of marine environment

作　　者：方从启[1] 孙红运 杨帅[1] 邱春杰 胡冉[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 [2]上海市房地产科学研究院房屋质量检测站,上海200240

出　　处：《混凝土》2017年第4期69-73,77,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：以船舶撞击桥墩的工程事故为背景,在腐蚀的钢筋混凝土墩柱受落锤式冲击试验的基础上,利用ANSYS/LS-DYNA进行数值模拟。通过钢筋力学性能的退化模拟钢筋腐蚀作用,以此研究受腐蚀的钢筋混凝土墩柱抗侧向冲击性能。研究结果表明:由冲击主拉应力的分布得到试件在冲击部位两侧各1/3处为试件冲击剪切破坏的薄弱部位;由冲击主压应力的分布得到试件的跨中冲击部位和两端墩帽的内侧角部位置为试件受压破坏薄弱部位;通过改变混凝土的强度,选取Holqmuist的混凝土模型参数进行对比分析,当冲击工况由GK1~GK5,在相同腐蚀率的条件下,高强度混凝土比低强度混凝土的峰值冲击力增长了49.03%,涨幅增加了1.746倍。Ship collision accident pier engineering background by corrosion of reinforced concrete piers drop hammer impact test by using ANSYS/LS-DYNA to simulate the test.By degradation simulation of steel corrosion of reinforced mechanical properties, based on reinforced concrete piers of corrosion resistance to lateral impact properties were studied.The results show that the distribution obtained by the impact of the main tensile stress in the specimen impact site on each side of 1/3 of the weak parts ＆the specimen impact shear failure. The main impact from the stress distribution across the impact has been part of the specimen and the inner comers of the positions of both ends of the test piece pier cap pressure damage weak parts.By changing the strength of concrete,concrete Holqmuist selected model parameters were analyzed,when the impact of working conditions by the GK1 to GK5,corrosion rate in the same conditions as,the high-strength concrete increased by 49.03% lower than the peak force of the impact strength of the concrete, or an increase of 1.746 times.

关 键 词：腐蚀 钢筋混凝土 桥墩 冲击 

分 类 号：TU528.01[建筑科学—建筑技术科学]