临淮关淮河大桥承台大体积混凝土温度控制与数值分析
Temperature Control and Numerical Analysis of Mass Concrete on Bearing Platform of Huaihe River Bridge in Linhui Pass
蒿一旭 1李大华1
作者信息
- 1. 安徽建筑大学 土木工程学院,安徽 合肥 230601
- 折叠
摘要
裂缝控制是桥梁承台施工中的关键技术,其质量直接关系到整个桥梁的安全运行.然而,在承台浇筑过程中,由于混凝土体积大、温度变化大等因素,容易导致混凝土承台产生温度裂缝,影响承台的使用寿命和安全性.本文以临淮关淮河大桥施工项目为背景,通过MIDAS/FEA建立大体积混凝土承台有限元模型进行混凝土温度场的模拟分析,将仿真计算结果与实测温度进行对比验证模型的合理性,通过布置冷却水管、蓄热法养护等措施可明显降低外部环境温度的直接影响,将大体积混凝土承台浇筑阶段最大温度差控制在合理范围,减少混凝土承台温度裂缝的产生.
Abstract
Crack control is the key technology in bridge cap construction,and its quality is directly related to the safe operation of the whole bridge.However,in the process of cap pouring,due to the large volume of concrete,large temperature change and other factors,it is easy to cause temperature cracks in the concrete cap,which will affect the service life and safety of the cap.In this paper,based on the construction project of Huaihe River Bridge in Linhui Pass,MIDAS/FEA was used to establish a finite element model of large volume concrete bearing table to simulate and analyze the temperature field of concrete,and the rationality of the model was veri-fied by comparing the simulation results with the measured temperature.The direct influence of external environ-ment temperature could be significantly reduced through the arrangement of cooling water pipes and the mainte-nance of heat storage.The maximum temperature difference in the pouring stage of mass concrete cap is con-trolled in a reasonable range,and the temperature crack of concrete cap is reduced.
关键词
大体积混凝土/水化热/温度裂缝/管冷/保温措施Key words
mass concrete/heat of hydration/temperature cracks/pipe cooling/insulation measures引用本文复制引用
基金项目
安徽建工集团股份有限公司校企合作基金(HYB20210150)
出版年
2024
NETL
NSTL
万方数据