大体积承台混凝土水化热温度场分析

发布时间：2018-01-16 23:28

本文关键词：大体积承台混凝土水化热温度场分析　出处：《公路》2017年07期 　论文类型：期刊论文

【摘要】：现阶段大体积混凝土、高强混凝土以及耐久性混凝土在实际工程中得到了广泛的应用,由水化热引起的温度裂缝问题也越来越被设计人员所关注。水化热引起的温度裂缝经常发生在结构施工初期,宽度较大且具有贯通性,对结构的耐久性和透水性产生不利影响。因此在整个设计、施工以及监理阶段需要对水化热引起的温度应力进行详细验算。依托某特大桥承台大体积混凝土的施工,利用有限元软件模拟水化热过程,对温度、应力提出控制措施,指导实际施工。在施工时采取合理的控制措施,并进行温度数据的采集以验证措施的有效性。
[Abstract]:At present, mass concrete, high-strength concrete and durability concrete have been widely used in practical engineering. The temperature cracks caused by hydration heat are also paid more and more attention by designers. The temperature cracks caused by hydration heat often occur in the early stage of structure construction, and they are wide and penetrating. Adverse effects on durability and permeability of the structure. Therefore, throughout the design. In the stage of construction and supervision, the temperature stress caused by hydration heat should be checked and calculated in detail. Based on the construction of mass concrete in the cap of a super large bridge, the process of hydration heat is simulated by finite element software, and the temperature is simulated. Stress control measures are put forward to guide actual construction. Reasonable control measures are taken during construction and temperature data collection is carried out to verify the effectiveness of the measures.
【作者单位】：西安方舟工程咨询有限责任公司;长安大学;
【基金】：交通运输部建设科技项目,项目编号2013318223040 陕西省科技重点项目,项目编号2014SZS19-Z02
【分类号】：U445.57
【正文快照】： 1大体积混凝土水化热分析大体积混凝土结构断面尺寸比较大,混凝土浇筑以后,由于水泥的水化热,内部温度急剧上升,此时混凝土的弹性模量很小,徐变较大,温度引起的拉应力并不大,但在日后温度逐渐降低时,弹性模量比较大,徐变较小,有一定的约束时就会产生相当大的拉应力[1]。当拉应

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