大跨度连续刚构桥超高墩合理构造形式研究

发布时间：2018-03-04 04:25

本文选题：超高墩　切入点：组合式桥墩　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着西部交通事业的蓬勃发展,公路网络覆盖面愈来愈大。预应力混凝土连续刚构桥以其跨越能力大、整体性能好、受力合理、施工方便等优点,成为西部山区高速公路主要的结构形式。受到山区特殊地形的限制,需要采用高墩甚至超高墩来跨越峡谷和河流。对于桥墩高度超过百米的连续刚构桥,不同的桥墩结构形式对桥梁结构的受力和费用有很大影响。本文以贵州省天桥特大桥为工程背景,研究了连续刚构桥组合式桥墩合理构造形式。主要开展以下研究工作:①总结国内外连续刚构桥桥墩常用构造形式,介绍了高墩稳定分析中常用的平衡法、能量法及有限元法。②针对由独墩和双薄壁墩组合而成的组合式桥墩,利用能量法原理中的瑞利-里兹法推导了面内、面外稳定屈曲计算公式,并与有限元计算结果比较,验证文中推导计算公式的准确性。③以组合式桥墩为研究对象,研究组合式桥墩中双薄壁墩和独墩分界点位置,得出了组合式桥墩分界点位置与桥墩高度关系不大,与桥墩的截面特性关系较大,改变组合式桥墩上部双薄壁墩及下部独墩的截面特性可以显著的影响桥墩合理分界点位置。利用本文推导的组合式桥墩面内、面外屈曲计算公式,提出了组合式桥墩分界点位置的计算方法,通过图解法可以较为方便的计算出组合式桥墩的合理分界点位置。④分析了影响超高墩稳定性能的几种主要因素,包括桥墩高墩、截面形式、桥墩垂直度及桥墩截面温度梯度对稳定性的影响。分析表明,稳定性能随着桥墩高度的增加急剧下降,桥墩截面的面内、面外抗弯刚度会对相应面内、外的稳定性产生较大的影响;桥墩的垂直度及温度梯度亦会降低桥墩的稳定性能。
[Abstract]:With the rapid development of traffic in western China, the coverage of highway network is becoming larger and larger. The prestressed concrete continuous rigid frame bridge has the advantages of large span capacity, good overall performance, reasonable force, convenient construction, etc. It has become the main structural form of highway in the western mountainous area. Restricted by the special terrain of mountain area, it is necessary to use high pier or even super pier to cross canyon and river. For continuous rigid frame bridge whose pier height is more than 100 meters, Different types of pier structure have great influence on the force and cost of bridge structure. This paper takes the oversize bridge of Guizhou Province as the engineering background. This paper studies the rational structure form of continuous rigid frame bridge composite pier, mainly carries out the following research work: 1 summarizes the common structural forms of continuous rigid frame bridge pier at home and abroad, and introduces the balance method commonly used in the stability analysis of high pier. The energy method and the finite element method .2 are used to deduce the in-plane and out-of-plane buckling formulas for the composite pier composed of the single pier and the double thin-walled pier, and the results are compared with the results of the finite element method, using the Rayleigh-Ritz method in the principle of the energy method. To verify the accuracy of the formula derived in this paper, taking the combined pier as the research object, the location of the boundary point between the double thin-walled pier and the single pier in the composite pier is studied, and the conclusion is drawn that the location of the separation point of the combined pier has little relationship with the height of the pier. Changing the cross-section characteristics of the upper double thin-walled pier and the lower single pier of the combined pier can significantly affect the location of the reasonable boundary point of the pier. The formula for calculating the buckling of the composite pier in and out of the deck is derived in this paper. This paper puts forward a method to calculate the location of the dividing point of the combined pier. It is convenient to calculate the reasonable location of the dividing point of the composite pier by using the graphic method, and several main factors affecting the stability of the super high pier are analyzed, including the high pier of the bridge pier. The analysis shows that the stability performance decreases sharply with the increase of pier height, and the in-plane and out-of-plane flexural stiffness of the pier section will be affected by the in-plane bending stiffness of the pier section. The stability of the piers will be reduced by the vertical degree and temperature gradient of the piers.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.23

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