大跨径PC连续刚构桥设计参数优化研究

【作者】 李杰；

【导师】 徐岳；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2003， 硕士

【摘要】 本文对大跨径预应力连续刚构桥的设计参数进行了分析研究。在资料的收集和分析基础上，借鉴已建成的实桥资料和最新的研究结果，对适合我国西部地形地貌及交通建设条件的双薄壁墩连续刚构桥的优化设计理论与方法进行了研究。 通过对双薄壁墩连续刚构桥的数值分析，探讨了双薄壁墩设计的影响因素，着重从双薄壁桥墩连续刚构桥的受力分析出发，以非线性规划为基础，提出了考虑基础弹性变形的优化设计方法。 针对变高度箱梁的结构受力特点，结合实桥资料的数值分析，考虑结构稳定及强度的影响，给出了各向同性箱梁板厚、箱梁梁高和梁底曲线的优化设计公式及构造范围。 以既有PC连续刚构桥孔跨比分析为基础，以工程经济为基本理论，提出了经济跨径的计算方法。 考虑大跨径预应力混凝土连续(刚构)桥施工的特点，提出了基于倒装方法的预应力静定束、合龙束以及竖向束的优化设计理论，并编制了相应的计算程序。更多还原

【Abstract】 The thesis studies and analyzes parameter design of long span prestressed concrete continuous rigid-frame bridge. On the basis of data collection and analyse, the paper draws lessons from the built bridge and the newest research achievement ,and studies the optimal design theory and method of the continuous rigid-frame bridge with double thin-wall flexible piers which especially adapts to landform and transportation development condition in the western regions.Through numerical analysis of the double thin-wall flexible piers continuous rigid-frame bridge, the paper discusses the design influence of the double thin-wall flexible piers. Based on the nonlinear programming, the paper thinks about elastic displacement of groundwork, from force analysis of the double thin-wall flexible piers continuous rigid-frame bridge, to draw to the method of parameter optimal design method.Directed against the characteristic of variational high box-girder structural force, and numerical analysis of to be built bridge, taking into account construction stabilization and intension, the thesis putts forward optimal formula constructional range of isotropic box-girder thick, girder highness and underside bridge curve.On the basis of the analyse of built continuous rigid-frame bridge ratio of span , according to the concept of engineering economy, while only to think about cost, the paper gains to choice rational ratio of span formula.Considering to the continuous rigid-frame bridge construction characteristic, putting forward the idea of reverse to optimize prestressed steel. According to different construction phases, the paper gets the formual of the cantalever phase, join two section of a bridge phase and the vertical prestressed steel, and works out corresponding program.更多还原