摘要
针对地铁车站大体积混凝土的温度裂缝问题,建立地铁车站有限元模型,研究水化热产生的温度场,在此基础上,考虑温度场和结构荷载的组合,计算结构应力。研究结果表明:顶板最高温度出现于纵梁内部,温度整体趋势为先增后减,最高温度出现在龄期2~3 d左右,最高温度可达到44.2℃;梁柱交接处出现应力集中,最大拉应力达到9.76 MPa;梁顶拉应力值小于混凝土抗强强度,表明梁顶混凝土不会被拉裂,但安全系数较小。
In view of the temperature crack of mass concrete in subway station,the finite element model was established to study the temperature field generated by hydration heat.On this basis,the combination of temperature field and structural load was considered to calculate the structural stress.The results show that the maximum temperature of the roof appears in the interior of the rail.The overall trend of temperature increases first and then decreases.The maximum temperature appears in the age of about 2~3 day,and the maximum temperature can reach 44.2℃.Stress concentration occurs at the beam-column junction,and the maximum tensile stress reaches 9.76 MPa.The tensile stress value of the beam is less than the strength of concrete,indicating that the concrete will not be cracking,but the safety factor is small.
作者
王雪彦
曹文龙
张培
Wang Xue-yan;Cao Wen-long;Zhang Pei
出处
《建筑技术开发》
2023年第1期143-145,共3页
Building Technology Development
基金
河北省高等学校科学技术研究项目(Z2019080)。
关键词
温度应力
温度场
地铁车站
水化热
temperature stress
temperature field
subway station
hydration heat
