柱板式空心墩温度效应分析研究

发布时间：2018-01-04 19:35

本文关键词：柱板式空心墩温度效应分析研究　出处：《世界桥梁》2014年03期 　论文类型：期刊论文

【摘要】：为了解柱板式空心高墩在日照升温和寒潮降温作用下温度场及温度效应的分布情况,以某铁路预应力混凝土连续刚构桥的柱板式空心高墩为背景,实测柱板式高墩各测试截面在日照升温和寒潮降温作用下沿壁厚方向温度分布,通过有限元分析,得到柱板式空心墩在日照升温和寒潮降温作用下温度效应。利用数值回归分析法,得到柱板式空心墩墩壁温差梯度拟合函数,以及温度荷载加载计算的简化模式。研究结果显示,外界气温变化对柱板式空心墩板的影响深度只有60cm左右,且沿混凝土板厚度方向温度呈非线性变化;日照升温作用下在柱和板过渡段折角处出现较大的拉应力和压应力,寒潮降温作用下,在柱和板过渡段的折角处出现较大的拉应力;温度梯度在柱板式空心墩的板厚方向是按照指数函数形式分布,简化后可采用折线温度荷载模式。
[Abstract]:In order to cool the distribution under the action of temperature field and temperature effect of solution column plate hollow high pier in the sunshine and cold, with a railway prestressed concrete continuous rigid frame bridge column plate hollow high pier as the background, the measured high pier column temperature drop in each test section of the sunshine and cold temperature distribution along the thickness direction. Through finite element analysis, get the cooling temperature effect of column plate hollow pier in the sunshine and cold. The numerical regression analysis method to get the column plate hollow piers wall temperature gradient fitting function, simplified model and temperature load calculation. The results showed that the depth of the outside temperature changes impact on the column plate hollow piers plate only about 60cm, and the temperature along the direction of thickness of concrete slab is nonlinear; under the action of the sunshine in the column and plate transition angle at greater tensile stress and compressive Under the action of cold wave, there is a large tensile stress at the corner of column and plate transition. The temperature gradient is distributed in the form of exponential function in the thickness direction of column and hollow hollow pier. After simplification, we can use the broken line temperature load mode.

【作者单位】：兰州铁道设计院有限公司;
【分类号】：U441.5
【正文快照】： 1引言柱板式空心高墩在经历太阳辐射升温或寒潮降温作用时,由于钢筋混凝土材料的不良导热性,桥墩的不同壁面或者同一壁面的内、外表面会出现比较大的温差,较大的温差必然会导致不均匀的变形,当变形受到边界约束时,就会在桥墩中引起相当大的温度应力,导致混凝土开裂,进而对混凝

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