氯盐腐蚀混凝土桥墩抗侧向冲击性能研究

发布时间：2018-01-13 03:00

本文关键词：氯盐腐蚀混凝土桥墩抗侧向冲击性能研究　出处：《混凝土》2017年04期 　论文类型：期刊论文

【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。
[Abstract]:Based on the engineering accident of ship impact on bridge pier, the corroded reinforced concrete pier column is subjected to the impact test of falling hammer. Numerical simulation is carried out by ANSYS/LS-DYNA. The corrosion of steel bar is simulated by the degradation of the mechanical properties of steel bar. The lateral impact resistance of corroded reinforced concrete pier columns is studied. The results show that:. According to the distribution of the main tensile stress of impact, 1/3 parts on both sides of the impact site are the weak parts of the impact shear failure of the specimen. According to the distribution of the main compressive stress of the specimen, the impact position in the middle span of the specimen and the inner corner position of the cap at both ends of the pier are the weak parts of the specimen under compression. By changing the strength of concrete, the concrete model parameters of Holqmuist are compared and analyzed. When the impact condition is from GK1 to GK5, under the condition of the same corrosion rate. Compared with low strength concrete, the peak impact force of high strength concrete increased by 49.03, an increase of 1.746 times.
【作者单位】：上海交通大学船舶海洋与建筑工程学院;上海市房地产科学研究院房屋质量检测站;
【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)
【分类号】：U443.22
【正文快照】： 0引言随着交通行业的大力推进,水陆运输系统交叉使得跨江跨海桥梁成了船舶通行的障碍。桥墩作为桥梁下部结构的重要组成部分,受到船舶撞击的概率也越来越大[1]。在正常服役期间,桥墩除了承受上部荷载、车辆动载、风荷载和地震荷载,也会受到日常环境的侵蚀作用,如混凝土碳化、

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