双肢薄壁墩温度效应仿真分析

发布时间：2018-10-16 15:50

【摘要】：随着我国高速公路以及高速铁路建设的迅猛发展,桥梁交通建设逐渐向深山峡谷中延伸。在深山峡谷中,高墩大跨连续刚构桥是一种很有竞争力的桥型,双肢薄壁墩是一种受力特点符合该类型桥梁的桥墩,导致其得到了大量的应用。并且深山峡谷中一般日照温差较大,薄壁混凝土结构相对温度变化又较为敏感,所以,对双肢薄壁空心高墩的温度场和温差效应进行研究具有重要的现实意义和科研价值。本论文以邢汾高速公路m:水大桥105.09 m高的双肢等截面矩形空心墩和邢汾高速公路贺坪峡大桥40.0 m的双肢等截面矩形实体墩为研究对象,对其温度场进行了测试和分析研究,同时利用ANSYS有限元软件的二次开发功能编制开发了双肢薄壁墩日照温度场计算的专用程序对其温度场进行了模拟计算分析,经实测值与计算值进行对比,验证了二次开发成果的准确性和可靠性。利用该开发成果分别对两桥墩的温差效应进行了仿真分析,计算结果证明了双肢墩在日照温差荷载作用下的温度应力与变形非常大,不可忽视,同时得出了双肢薄壁墩的温度场分布规律。其次计算分析了双肢薄壁墩在改变截面形状、边界条件以及墩壁厚度的情况下对温度场的影响,并总结分析了日照温度荷载对高墩大跨桥梁结构的影响,提出了一些减小温差应力和墩顶位移以及裂缝的有效措施,结论可以为该类型桥墩的设计和施工提供参考。
[Abstract]:With the rapid development of highway and high-speed railway construction in China, bridge traffic construction gradually extends to deep mountain canyons. In the deep mountain gorge, the continuous rigid frame bridge with high piers and long span is a very competitive bridge type, and the two-leg thin-walled pier is a bridge pier with the characteristics of bearing force, which leads to a large number of applications. In the deep mountain canyon, the temperature difference of sunlight is large, and the relative temperature change of thin-walled concrete structure is sensitive. Therefore, it is of great practical significance and scientific research value to study the temperature field and temperature difference effect of double-legged thin-walled hollow high pier. At the same time, using the secondary development function of ANSYS finite element software, a special program for the calculation of sunshine temperature field of two-leg thin-walled pier is developed, and the temperature field is simulated and analyzed, and the measured value is compared with the calculated value. The temperature difference effect of the two piers is simulated and analyzed by using the development results. The calculation results show that the temperature stress and deformation of the double pier under the action of sunshine temperature difference load are very large and can not be ignored. At the same time, the temperature field distribution of two-leg thin-walled pier is obtained. Secondly, the influence of two-leg thin-walled pier on the temperature field under the condition of changing section shape, boundary condition and the thickness of pier wall is calculated and analyzed, and the effect of sunshine temperature load on long-span bridge structure with high piers is summarized and analyzed. Some effective measures to reduce the temperature difference stress, the displacement of the pier top and the crack are put forward. The conclusion can provide a reference for the design and construction of this type of pier.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.5

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