环境温度作用下圆形混凝土沉箱温度场试验研究  

Experimental Study on Temperature Field of Cylindrical Concrete Caissons Under Surrounding Temperature

作　　者：陈宇 林熙杰 吕杨 黄信 李长辉 安彦勇 CHEN Yu;LIN Xijie;LYU Yang;HUANG Xin;LI Changhui;AN Yanyong(Civil Airport Engineering Research Base of China,Tianjin 300300,China;School of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;Tianjin Water Transport Engineering Survey and Design Institute,Tianjin 300456,China;School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]中国民航机场工程研究基地,天津300300 [2]中国民航大学交通科学与工程学院,天津300300 [3]天津水运工程勘察设计院,天津300456 [4]天津城建大学土木工程学院,天津300384

出　　处：《工业建筑》2023年第6期105-110,147,共7页Industrial Construction

基　　金：中国民航机场工程研究基地开放基金项目(205016010413);中国民航大学科研启动基金项目(2020KYQD37)。

摘　　要：以东北地区营口港码头已建成的圆形混凝土沉箱为研究对象,设计了环境温度作用下混凝土外壁温度场监测试验方案,完成了2018—2019年冬、春、夏、秋每个季节混凝土温度的7 d连续监测,同时采用LS-DYNA有限元软件建立了试验沉箱的有限元模型,分析了环境温度作用下沉箱混凝土四季的温度场和温度效应。研究表明:环境温度作用下沉箱外壁内侧混凝土温度变化缓慢,外侧混凝土随日照变化而快速变化;冬季沉箱内外侧混凝土温差和拉应力最大且超过混凝土抗拉强度;结构初始温度对冬季混凝土温度应力影响较大,当初始温度超过10℃时,沉箱混凝土外壁存在开裂风险,因此我国东北地区设计时应考虑环境温度作用对混凝土沉箱的温度效应。An experiment scheme for monitoring the temperature field of cylindrical concrete caisson outer wall under surrounding temperature was designed,which was built at Yingkou Port in northeast China.The 7-day continuous monitoring of concrete temperature in each season was measured in winter,spring,summer and autumn from 2018 to 2019.The finite element model of the experimental caisson was established by LS-DYNA finite element software,and the temperature field and temperature effect of the caisson concrete under surrounding temperature were analyzed.The results showed that the temperature of inside concrete caisson changed slowly under sunshine,while that of concrete outside changed rapidly.In winter,the temperature difference between the inside and outside of the concrete caisson was the largest,and the concrete tensile stress was the largest which exceeded the tensile strength.Moreover,the initial temperature of the structure had a great influence on the temperature stress of concrete in winter.When the initial temperature exceeded 10 ℃,there was a risk of cracking on the outer wall of caisson concrete.Therefore,the temperature effect of surrounding temperature on concrete caissons in northeast China should be considered in the design.

关 键 词：混凝土 沉箱 环境温度 日照 温度效应 开裂 

分 类 号：U656.1[交通运输工程—港口、海岸及近海工程]