环境温度和边界条件对混凝土梁式桥自振频率影响研究

发布时间：2018-01-10 04:04

本文关键词：环境温度和边界条件对混凝土梁式桥自振频率影响研究　出处：《振动与冲击》2017年08期 　论文类型：期刊论文

【摘要】：以北京市门头沟地区新建的一座简支梁桥和一座连续梁桥为例,将实测数据、理论分析和有限元模拟相结合研究了环境温度和边界条件对混凝土梁式桥自振频率的影响。分别对两座桥梁进行了24 h的实时监测,每隔一小时采集环境温度、自振频率、伸缩缝宽度等数据。从理论上分别分析了简支梁和连续梁自振频率的影响因素。针对分析结果,用有限元模拟了温度影响下橡胶支座刚度变化、伸缩缝不能正常伸缩和混凝土弹性模量随温度变化这三种情况下桥梁的工作状态,并与实测结果进行对比。结果表明,自然状态下橡胶支座刚度的变化对混凝土梁式桥的自振频率几乎没有影响。混凝土弹性模量的变化、伸缩缝的工作状态都会影响桥梁的自振频率,但对不同结构形式的桥梁影响权重不同。
[Abstract]:Taking a new simply supported beam bridge and a continuous beam bridge in Mentougou area of Beijing as an example, the measured data are measured. The effects of ambient temperature and boundary conditions on the natural vibration frequency of concrete beam bridges were studied by theoretical analysis and finite element simulation. The two bridges were monitored in real time for 24 hours. The data of ambient temperature, natural vibration frequency and expansion joint width are collected every one hour. The influence factors of natural vibration frequency of simply supported beam and continuous beam are analyzed theoretically. The finite element method is used to simulate the working state of the bridge under the influence of temperature on the stiffness of the rubber bearing, the expansion of the expansion joint can not be normal and the elastic modulus of concrete varies with the temperature. The results show that the change of rubber bearing stiffness has little effect on the natural vibration frequency of concrete beam bridge and the change of elastic modulus of concrete. The natural vibration frequency of the bridge is affected by the working state of the expansion joint, but the weight of the bridge is different.
【作者单位】：北京交通大学土木建筑工程学院;中国成达工程有限公司;交通运输部公路科学研究院;
【基金】：国家自然科学基金资助项目(51278031)
【分类号】：U441.3
【正文快照】： 桥梁的自振特性(如:频率、振型、阻尼)不仅与结构的刚度和损伤密切相关,也是进行新建桥梁抗震设计和既有桥梁性能评估的一个重要依据[1]。由环境因素(温度、湿度、特殊的腐蚀性环境等)引起的结构自振频率的改变是桥梁运营中的正常行为,与结构本身的健康状况无关,但环境因素对

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