框架箱涵的非结构性裂缝控制技术研究  

Research on Non-structural Crack Control of Frame Box Culvert

作　　者：朱兆斌[1] 宋郁民[2] ZHU Zhaobin;SONG Yumin(Hangzhou Railway Design Institute Co.,Ltd.,Hangzhou 310006,China;Urban Rail Transit College of Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]杭州铁路设计院有限责任公司,浙江杭州310006 [2]上海工程技术大学城市轨道交通学院,上海266100

出　　处：《四川建材》2021年第1期138-141,共4页Sichuan Building Materials

摘　　要：为了确保工程质量与安全,控制箱涵混凝土裂缝的产生,对框架箱涵裂缝控制措施进行了现场工程对比试验,分析了采取裂缝控制措施前后的框架箱涵温度场、应力场;通过数值模拟计算和分析了采用不同模板浇筑、铺设降温水管、预应力钢筋等裂缝控制措施对工程箱涵混凝土温度场和应力场的影响。结果表明:采用钢模板可以快速降低框架桥混凝土的整体温度、减小混凝土表面主拉应力;在箱涵混凝土中布置冷却水管,可有效降低混凝土的最高温度、温差,减小箱涵整体温度应力;同时在浇筑之前施加预应力筋可以有效的降低箱涵表面主拉应力的最大值。采用以上控制措施的B箱涵在拆模后未产生裂缝,其最高温度、最大温差、最大拉应力均显著优于未做裂缝控制的C箱涵。In order to guarantee the quality and safety of projects,and to prevent concrete cracks,field test was conducted to verify the feasibility of the crack control measures.Then the temperature field and stress field were analyzed.The numerical simulation was used to analyze the influence of the formwork,the cooling pipes,the prestressed tendons on the temperature field and stress field of the frame box culvert.The crack control effect was compared and analyzed.Results show that the use of steel formwork to cool the frame box culvert,fast to reduce concrete temperature,decrease the principal tension stress.The cooling pipes can help reduce the overall temperature,the temperature difference and temperature stress rapidly.The maximum principal stress can be reduced significantly because of the prestressed tendons.There was no crack in Frame box culvert B,it outperforms Frame box culvert C on maximum temperature,maximum temperature difference and maximum tension stress.

关 键 词：框架箱涵 裂缝 温度场 应力场 有限元分析 

分 类 号：TU755.7[建筑科学—建筑技术科学]