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随着桥梁技术的不断发展,大跨径桥梁在高速公路工程中被大量修建,随之产生越来越多大体积混凝土构件。这些大体积构件在浇筑、养护初期释放大量水化热,由于混凝土导热性差使构件内外形成温差发生膨胀变形,甚至导致不同程度温度裂缝,这对结构使用性、安全性、耐久性产生不同程度的影响。预测大体积混凝土构件水化放热发展规律,采取针对性温控措施,对确保构件质量具有重要意义。本文借助MIDAS FEA有限元分析软件,以本项目某跨江大桥0#块为原型对其水化放热规律进行分析预测,结合温度监测及温控效果,以期在后续的大体积混凝土施工的温度裂缝防控中提供一定思路。
With the continuous development of bridge technology, large-span bridges have been extensively constructed in expressway projects, with consequent generation of more and more mass concrete components. Due to the poor thermal conductivity of concrete, the temperature difference between the inside and outside of the component expands and deforms, and even leads to different degrees of temperature cracks, which result in different degrees of structural usability, safety and durability influences. It is of great importance to predict the development of hydration and exothermic behavior of mass concrete members and take targeted temperature control measures to ensure the quality of components. In this paper, MIDAS FEA finite element analysis software is used to analyze and forecast the hydration exothermic rule of 0 # block of a cross-river bridge in this project. Combined with temperature monitoring and temperature control effects, Crack prevention and control to provide some ideas.