文档介绍：摘要
沪蓉高速公路八字岭大桥,桥梁位于沪蓉国道主干线湖北省宜昌至恩施段k25+850处,跨越八字岭河谷,河谷较深,河宽约220m,河道与路线正交,河床稳定,滩槽分明,河道顺直,洪水期无漂流物和泥石流,泄洪顺畅。
根据毕业设计任务书,本设计主要分为十部分内容。
第一、二部分是整理基本资料,制定三个比选方案:方案一为预应力混凝土连续梁桥;方案二为预应力混凝土简支梁桥;方案三为预应力混凝土连续钢构桥。通过方案比选,本设计采用方案一,预应力混凝土连续梁桥作为推荐方案并对其进行了设计计算。,孔径布置为:30m+3×45m+30m,桥梁横断面的形式为单箱双室等截面。
第三部分至第八部分是主梁的计算,包括主梁的尺寸拟定、内力计算、预应力筋束的布置、预应力损失的计算和截面验算。主梁内力计算采用程序与手算结合的方法,以便相互校核。最终使用程序计算的结果进行内力组合。
第九部分是下部结构的计算,包括墩柱的内力计算和基础的尺寸验算。推荐方案桥梁的下部结构为双柱式桥墩,基础采用桩基础,桥台采用柱式桥台。
第十部分是施工组织设计。
在设计过程中,计算机的应用使一些计算过程更加简便,增强了对桥梁大师、VB语言、AUTOCAD、Office等软件的熟练程度。
关键词:连续梁桥、内力组合、截面强度、后张法、桩基础
Abstract
Baziling Bridge of Shanghai-Chengdu highway, the bridge is located in Shanghai-Chengdu national trunk road from Hubei Yichang to Enshi sections at k25 +850, acrossing the Bazhiling valley, a deep valley about 220 meters wide, and the line orthogonal channel, with stability riverbed, beach slot clear, straight river, flood-free drifting objects and debris flow, flood smoothly.
According to the graduate design task,The design is divided into ten parts.
The first and the second part is sorting out the basic information, and constituting pared schemes::Program One for the prestressed concrete continuous bridge; program two for the prestressed concrete beams bridge; Programme three for the prestressed concrete continuous rigid frame bridge. The thesis designs the program one prestressed concrete continuous beam bridge as the mended program and had made a calculation for its design. and it's transect is single box double room equation sections.
The third to the eighth part is about putation,which includes deciding the beam's dimension,calculating internal force,disposing pre-stress steel puting the pre-stress losing,and putations section. The main beam internal bines the programe and manpower that can be checked each other. Finally the thesis carries on the internal bination adopting the program results.
The ninth part is the down putation,which puting the frusta & pile internal force and checki