论文总字数：20989字

摘 要

Abstract

第一章 工程概况与背景

1.1 水文地质资料及设计依据

1.3 主要材料

第二章 初步设计方案

2.1 总体布置

2.2 结构构造

第三章 荷载内力计算

3.1恒载

3.2活载

3.3附加力

3.4荷载组合

3.5 计算方法

3.6 模型的建立

3.7 荷载组合内力及包络图

3.8次内力计算

第四章 预应力钢筋的设计计算

4.1 主梁的配筋计算

4.2横梁配筋计算

4.3纵梁的配筋计算

第五章 预应力损失计算

5.1.摩阻损失

5.2锚具变形损失

5.3混凝土的弹性压缩

5.4钢束松弛损失

5.6有效预应力的计算

第六章 截面强度验算

6.1基本理论

6.2拱肋稳定性验算

6.3持久状况承载能力极限状态计算

第七章 墩及桩基础设计与计算

7.1支座

7.2桩基础设计

参考文献

总结与展望

摘要

近年来，预应力混凝土连续梁桥由于其跨越能力大、施工方法灵活、适应性强、结构刚度大、抗地震能力强、通车平顺性好以及造型美观等特点，在国内越来越得到广泛的应用。本论文设计的是八坼运河预应力混凝土连续梁桥主跨桥方案设计，大桥位于吴江市八坼镇境内，为东西向跨越京杭大运河桥梁。由于苏南运河航道整治，全线要求达到Ⅲ级航道标准，要求通航净空满足80×7m要求。老桥通航净宽不满足80m要求，需拆除重建。考虑未来吴江市城市主干线东西干线的顺接通行要求，将新建桥梁桥位北移约2km，并提高原有桥梁设计标准重建。未来八坼桥梁规划桥宽为双幅共36m，现阶段实施单幅18m，现阶段实施桥梁采用双向4车道机非混行车道，路线线形设计预留100km/h时速标准，两侧设置防撞护栏。为了满足Ⅲ级航道的要求连续梁桥的主跨要大于95～100m，主桥拟采用三跨连续梁桥。本桥主跨采用78 120 78m预应力混凝土变截面连续箱梁。

设计主要过程如下：

1. 首先进行恒载、活载及次内力的计算,在此基础上进行荷载组合,绘制弯矩和剪力包络图。

2.根据短期效应组合估算纵向预应力筋数量，然后再布置预应力钢束和预应力损失的计算。

3.进行截面强度验算。

关键词：设计 连续梁桥 预应力

Abstract

In recent years, prestressed concrete continuous beam bridge because of its ability to span large、flexible construction methods、Adaptability、structural rigidity、 anti-seismic capability, as well as the opening of a good ride beautiful shape and other characteristics，In the country it has been more widely used. In this thesis, the canal is Bache prestressed concrete continuous beam bridge main span of the bridge design, Bache Wujiang Bridge is located within the town, East-west across the Grand Canal bridge. As Sunan Canal waterway, full range of requirements to achieve Grade Ⅲ standard, requiring navigation clearance requirements to meet the 80 × 7m. Old Bridge navigable clear width 80m requirement is not satisfied, to be demolished and rebuilt. Consider the future Wujiang City trunk line connected to something along the lines of requirements, the new bridge bridge-bit northward approximately 2km, and improve the existing bridge design standards reconstruction. Future planning Bache bridge bridge width is double width of 36m, single-stage implementation of 18m, the implementation stage, two-way four-lane bridge machine immiscible carriageway route alignment design reserved 100km/h speed standard, crash barriers on both sides. In order to meet the requirements of Grade Ⅲ continuous bridge main span is greater than 95 ~ 100m, the main bridge intends to adopt three-span continuous beam bridge. The main span of the bridge using 78 120 78 m uniform continuous prestressed concrete box girder.

Design of the main process is as follows:

First, the constant load, live load class times force calculations performed on the basis of load combinations, draw bending moment and shear envelope.

Second,Short-term effects of a combination according to estimates the number of longitudinal prestressing tendons, and then arranged and prestressed tendon damage calculations.

Thirdly,Conduct cross-sectional strength checking.

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