李嘉1?覮,陈卫1,2,王万鹏1,3,赵昭1.TPO-薄层UHPC轻型组合桥面层间温度应力研究[J].湖南大学学报:自然科学版,2018,45(11):86~93
TPO-薄层UHPC轻型组合桥面层间温度应力研究
Research on Interface Temperature Stress of TPO-UHPC Lightweight Composite Bridge Decks
  
DOI:
中文关键词:  桥梁工程  组合桥面  层间温度应力  超高性能混凝土  薄层聚合物混凝土面层  有限元
英文关键词:bridge engineering  composite bridge deck  interface temperature stress  ultra high performance concrete  thin polymer overlay  finite element
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作者单位
李嘉1?覮,陈卫1,2,王万鹏1,3,赵昭1 (1.湖南大学 土木工程学院,湖南 长沙 4100822.广西交通设计集团有限公司广西 南宁 530029 3.上海市政工程设计研究总院(集团)有限公司上海 200092) 
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中文摘要:
      为掌握轻型组合桥面温度应力变化规律,避免TPO-UHPC层间受力破坏,采用应变片法和超声波法分别测定TPO材料的热膨胀系数和弹性模量;利用ABAQUS有限元软件对组合铺装进行层间温度应力研究;对影响TPO-UHPC层间温度应力的主要因素进行参数敏感性分析,探讨热膨胀系数比、TPO厚度、施工温度等对层间温度应力的影响.试验研究表明:TPO热膨胀系数比水泥基材料要大得多,TPO弹性模量随温度升高而减小.仿真计算显示:均匀温度变化下,层间剪应力和法向拉应力随着膨胀系数比和TPO层厚度减小而减小;层间剪切应力相较于法向拉应力在铺装体系中占主导地位;在高温和低温环境下,施工温度对TPO-UHPC层间应力的影响趋势相反,选择合适的TPO厚度及施工温度,可以减小温度应力幅.
英文摘要:
      In order to master the temperature stress variation of lightweight composite bridge decks and to avoid interlaminar failures between TPO-UHPC, the thermal expansion coefficient and elastic modulus of TPO materials were investigated by strain gauge method and ultrasonic method respectively; the interface temperature stresses of the composite pavement system were calculated by using ABAQUS finite element software. The parameter sensitivity analysis was performed on the main factors that affect the interface temperature stress of the pavement system. The effects on interface thermal stress between TPO-UHPC were discussed, referring to thermal expansion coefficient ratio, TPO thickness and construction temperature. The experimental results show that the thermal expansion coefficient of TPO is much larger than that of cement-based materials, and the elastic modulus of TPO decreases with the increase of temperature. The simulation results show that,under the condition of uniform temperature, the interlaminar shear stress and the normal tensile stress decrease with decreasing the expansion coefficient ratio and the thickness of the TPO layer; the interlaminar shear stress plays a more dominant role than the normal tensile stress in the pavement system. The influences of construction temperature on the interlaminar stress of TPO-UHPC are different for high and low temperature. It is possible to reduce the interface temperature stress amplitude by a suitable construction temperature and TPO thickness.
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