连续刚构桥高墩参数设计与稳定性研究

发布时间：2018-09-09 20:24

【摘要】：查阅国内外关于高墩连续刚构桥的发展历史与现状，高墩连续刚构由于自身的优越性在桥梁大家族中占有一席之地，特别是在我国西部地区得到广泛应用。连续刚构高墩大多采用薄壁截面形式，故其自身的稳定问题非常突出。高墩的稳定问题也是工程实际应用中不可忽略的关键问题。因此高墩的稳定性研究就显得十分有意义。本文结合背景工程的一座高墩多跨连续刚构桥对高墩的抗推刚度的合理性，高墩的计算长度系数以及高墩刚构桥的稳定性做了一些研究。 ⑴首先从高墩的抗推刚度、薄壁墩纵向合理厚度、双薄壁墩间距几个方面对高墩刚度的合理性进行了研究，结果表明高墩刚构桥采用双肢薄壁墩，在纵桥向既有很好的柔度又具有足够的抗弯刚度，而且合理的双薄壁墩间距能够降低主梁墩顶截面的弯矩，从而降低梁高，，桥梁显得更加纤细与美观。 ⑵接着介绍了从结构的稳定特征值反算高墩的计算长度系数和考虑偏心受压、而且边界条件非标准情况下，利用构件的挠曲微分方程来求解计算长度系数；高墩连续刚构可能出现的两种失稳情况进行稳定性分析时，应该取不同的计算长度系数值。 ⑶最后，本文高墩连续刚构桥在施工到运营阶段3个关键阶段的稳定性进行了研究.研究结果表明高墩刚构桥的稳定性主要有其自身的自重决定，而其它的风荷载、施工荷载、偶然荷载、汽车荷载以及温度荷载等均对高墩刚构的稳定性影响很小。
[Abstract]:Referring to the development history and present situation of continuous rigid frame bridge with high piers at home and abroad, the continuous rigid frame with high pier occupies a place in the bridge family because of its own superiority, especially in the western region of our country. The continuous rigid frame high pier is mostly thin-walled section, so its own stability problem is very prominent. The stability of high piers is also a key problem in engineering practice. Therefore, the study of the stability of high piers is of great significance. In this paper, the rationality of a multi-span continuous rigid frame bridge with high piers, the calculation length coefficient of high piers and the stability of rigid frame bridges with high piers are studied. The reasonable longitudinal thickness of thin-walled piers and the spacing between two thin-walled piers are studied. The results show that the rigid frame bridges with high piers have both good flexibility and sufficient flexural stiffness in the longitudinal direction. Moreover, reasonable spacing between two thin-walled piers can reduce the bending moment of the top section of the main beam pier, thus reducing the beam height. The bridge is more slender and beautiful. (2) then the calculated length coefficient and eccentricity of the pier are calculated from the stability eigenvalue of the structure, and the boundary conditions are non-standard. The calculated length coefficient is solved by using the flexural differential equation of the member, and when the stability analysis of two possible instability cases of continuous rigid frame with high pier is carried out, different values of the calculated length coefficient should be taken. 3 finally, In this paper, the stability of continuous rigid frame bridge with high piers in three key stages from construction to operation is studied. The results show that the stability of high pier rigid frame bridge is mainly determined by its own weight, while other wind load, construction load, accidental load, automobile load and temperature load have little influence on the stability of high pier rigid frame.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23

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