混凝土连续箱梁支点处钢束预应力高温衰变研究
发布时间：2018-12-06 11:54
【摘要】：为研究混凝土连续梁支点处钢束在火灾下的预应力损失,选取某4跨预应力混凝土连续箱梁进行高温衰变分析。采用ANSYS软件建立混凝土箱梁截面预应力孔道有限元模型,分析孔道周围的温度分布,给出孔道平均温度的简化算法;分析不同火灾场景下支点截面钢束预应力的高温衰变率,并给出支点钢束预应力衰变率的计算方法。结果表明:不同受火场景下钢束预应力时程衰变率趋势相同;对于腹板底部钢束,预应力衰变率在延火前期下降速度快,延火后期下降速度慢,时间分界点约为40min;对于腹板中上部钢束,预应力衰变率在延火前后期内速度变化不明显。
[Abstract]:In order to study the prestress loss of steel beam at the fulcrum of concrete continuous beam under fire, a 4-span prestressed concrete continuous box girder is selected for high temperature decay analysis. The finite element model of prestressed hole in the section of concrete box girder is established by using ANSYS software. The temperature distribution around the channel is analyzed, and the simplified algorithm of the average temperature of the hole is given. In this paper, the high temperature decay rate of steel beam prestress with fulcrum section under different fire scenarios is analyzed, and the calculation method of prestressing force decay rate of fulcrum steel beam is given. The results show that the trend of prestress time history decay rate is the same under different fire scenarios, and for the steel beam at the bottom of web plate, the prestress decay rate decreases rapidly in the early stage of fire extension, and slow in the later stage of fire extension, and the time boundary point is about 40 min. For the upper and middle webs, the rate of prestress decay does not change obviously in the later stage of fire extension.
【作者单位】： 长安大学公路学院;长安大学旧桥检测与加固技术交通行业重点实验室;浙江工业大学建筑工程学院;浙江工业大学建筑规划设计研究院;
【基金】：国家自然科学基金项目(51308056) 中央高校基本科研业务专项资金项目(2014G2210003,2013G2211004,2014G2213002) 国家留学基金资助项目(201406565013)~~
【分类号】：U441
本文编号：2365984
[Abstract]:In order to study the prestress loss of steel beam at the fulcrum of concrete continuous beam under fire, a 4-span prestressed concrete continuous box girder is selected for high temperature decay analysis. The finite element model of prestressed hole in the section of concrete box girder is established by using ANSYS software. The temperature distribution around the channel is analyzed, and the simplified algorithm of the average temperature of the hole is given. In this paper, the high temperature decay rate of steel beam prestress with fulcrum section under different fire scenarios is analyzed, and the calculation method of prestressing force decay rate of fulcrum steel beam is given. The results show that the trend of prestress time history decay rate is the same under different fire scenarios, and for the steel beam at the bottom of web plate, the prestress decay rate decreases rapidly in the early stage of fire extension, and slow in the later stage of fire extension, and the time boundary point is about 40 min. For the upper and middle webs, the rate of prestress decay does not change obviously in the later stage of fire extension.
【作者单位】： 长安大学公路学院;长安大学旧桥检测与加固技术交通行业重点实验室;浙江工业大学建筑工程学院;浙江工业大学建筑规划设计研究院;
【基金】：国家自然科学基金项目(51308056) 中央高校基本科研业务专项资金项目(2014G2210003,2013G2211004,2014G2213002) 国家留学基金资助项目(201406565013)~~
【分类号】：U441
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