墩身高度和截面形式对超高大跨连续刚构桥受力性能影响研究
发布时间：2019-02-23 11:00
【摘要】：近年来由于我国偏远山区交通的发展,我国修建了大量的高墩连续刚构桥梁。这些刚构桥的墩高高矮不一,少则几十米,多则接近两百米。正是因为连续刚构桥发展欣欣向荣,所以很多学者对这种桥型进行了大量的研究,已经取得了丰硕的成果,但在墩身高度和截面形式的匹配方面研究较少。有鉴于此,本文以贵州赫章特大桥为工程背景,对墩身高度和截面形式对连续刚构桥梁力学性能的影响进行研究,主要内容如下：(1)采用MIDAS CIVIL软件建立了超高墩和常规墩两个有限元计算模型,超高墩计算模型为赫章特大桥实桥模型,常规高度墩计算模型为以墩高80米的等截面矩形墩代替实桥模型的主墩而建立的计算模型。之后,对两种体系在自重作用、汽车荷载作用、温度荷载作用、收缩徐变作用下主梁的应力和弯矩进行了对比分析,从中得出了一些相关结论。(2)针对墩身高度达195m的主墩,拟订了两种墩身截面形式：等截面双肢薄壁墩和变截面单箱三室墩。这两者在材料用量方面是相同的,抗弯刚度也近似相等。之后对其在裸墩状态、最大悬臂施工状态和成桥状态下的稳定性进行了对比分析,从而得出了何种截面形式在稳定性方面更加合理。通过以上两方面内容的研究,能够使我们更加了解刚构桥墩身高度不一样其受力性能存在的差别,以及单肢、双肢墩在稳定性方面的差异,对我们更好的认识刚构桥提供了理论数据参考。
[Abstract]:In recent years, due to the development of traffic in remote mountainous areas in China, a large number of continuous rigid frame bridges with high piers have been built in China. The piers of these rigid-frame bridges vary in height and height, ranging from tens of meters to more than 200 meters. It is precisely because the continuous rigid frame bridge develops prosperously, so many scholars have carried on the massive research to this kind of bridge type, has already obtained the rich achievement, but in the pier height and the section form matching aspect research is relatively few. In view of this, the influence of pier height and section form on the mechanical properties of continuous rigid frame bridge is studied in this paper, taking the Guizhou Hezhang Bridge as the engineering background. The main contents are as follows: (1) two finite element calculation models of super-high pier and conventional pier are established by using MIDAS CIVIL software. The calculation model of super-high pier is a real bridge model of Hezhang large bridge. The calculation model of conventional height pier is established by replacing the main pier of the real bridge model with the rectangular pier with equal cross section which is 80 meters high. Then, the stress and bending moment of the main beam under the action of deadweight, automobile load, temperature load, shrinkage and creep are compared and analyzed. Some relevant conclusions are drawn. (2) for the main pier with the height of 195 m, two types of pier cross-section are proposed: the two-leg thin-walled pier with equal cross-section and the three-chamber pier with variable cross-section. These two materials are the same in terms of the amount of materials, bending stiffness is approximately equal. After that, the stability in bare pier state, maximum cantilever construction state and bridge state is compared and analyzed, which section form is more reasonable in terms of stability. Through the research of the above two aspects, we can understand more about the difference of the pier height of rigid frame bridge and the difference in the stability of single and double pier. It provides a theoretical reference for us to better understand the rigid frame bridge.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.23
，
本文编号：2428755
[Abstract]:In recent years, due to the development of traffic in remote mountainous areas in China, a large number of continuous rigid frame bridges with high piers have been built in China. The piers of these rigid-frame bridges vary in height and height, ranging from tens of meters to more than 200 meters. It is precisely because the continuous rigid frame bridge develops prosperously, so many scholars have carried on the massive research to this kind of bridge type, has already obtained the rich achievement, but in the pier height and the section form matching aspect research is relatively few. In view of this, the influence of pier height and section form on the mechanical properties of continuous rigid frame bridge is studied in this paper, taking the Guizhou Hezhang Bridge as the engineering background. The main contents are as follows: (1) two finite element calculation models of super-high pier and conventional pier are established by using MIDAS CIVIL software. The calculation model of super-high pier is a real bridge model of Hezhang large bridge. The calculation model of conventional height pier is established by replacing the main pier of the real bridge model with the rectangular pier with equal cross section which is 80 meters high. Then, the stress and bending moment of the main beam under the action of deadweight, automobile load, temperature load, shrinkage and creep are compared and analyzed. Some relevant conclusions are drawn. (2) for the main pier with the height of 195 m, two types of pier cross-section are proposed: the two-leg thin-walled pier with equal cross-section and the three-chamber pier with variable cross-section. These two materials are the same in terms of the amount of materials, bending stiffness is approximately equal. After that, the stability in bare pier state, maximum cantilever construction state and bridge state is compared and analyzed, which section form is more reasonable in terms of stability. Through the research of the above two aspects, we can understand more about the difference of the pier height of rigid frame bridge and the difference in the stability of single and double pier. It provides a theoretical reference for us to better understand the rigid frame bridge.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.23
，
本文编号：2428755
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