混凝土拱桥毕业设计说明书 - 图文 联系客服

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3.2.3 荷载效应组合.............................................................................................26 3.3 应力输出...............................................................................................................28 3.3.1各施工阶段关键截面应力..........................................................................28 3.3.2使用极限状态各工况关键截面应力..........................................................30 3.4 位移输出...............................................................................................................31 3.4.1 使用阶段关键节点竖向位移.....................................................................31 3.5 支承反力...............................................................................................................31 3.5.1 施工阶段支承反力....................................................................................31 3.5.2 使用阶段支承反力.....................................................................................31 第四章 主拱圈截面配筋设计............................................................................................33 第五章 主拱验算...............................................................................................................35 5.1 施工应力验算......................................................................................................35 5.2 承载能力极限状态截面强度验算......................................................................41 5.3 正常使用极限状态裂缝宽度验算......................................................................44 第六章 工程数量统计.......................................................................................................47 第七章 结论.......................................................................................................................48 参考文献.............................................................................................................................50 致 谢.............................................................................................................................51

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摘要

黄家大坡大桥为毕节地区黔西县境内重要的桥梁,桥址区域属丘陵地貌,地形起伏,地质条件良好。

根据基本设计资料,初步拟定了T型刚构桥、拱桥两个方案。经综合比较,最终选择拱桥为设计方案。该拱桥为上承式拱桥,全桥由一跨跨越山谷的拱桥及两端引桥组成,拱桥的净跨径为120m,矢跨比为1/5。主拱圈截面采用箱形截面,拱上建筑为全空腹式,腹孔墩为钢筋混凝土柱式墩,腹孔上部结构采用标准跨径8.4m的预制空心板。引桥上部采用标准跨径14m的预制T梁。主拱采用悬链线作为拱轴线,根据桥博软件试算确定。

第二步就要进行结构计算,这其中最为关键的便是建模,最后的计算是否正确,在很大程度上取决于模型建得是否正确。本设计利用“桥梁博士”软件计算,将建好的模型图导入软件,并将计算好的模型参数赋给模型结构单元。添加约束后模型就宣告建立完成,进入计算阶段。利用软件就可计算出结构各控制截面的内力。

完成上述工作后,便要进行结构验算,对于拱桥最重要的就是要验算拱圈截面承载力与拱圈的裂缝宽度。

关键词:钢筋混凝土拱桥;上承式;;结构计算;拱桥验算

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Abstract

Huang Jia Da Po bridge as an important bridge in the Bijie area of Qianxi County, regional bridge site belongs to hilly topography, landform, geological condition is good.

According to the basic design data, the initial formulation of T rigid frame bridge, arch bridge two scheme. Through comprehensive comparison, the final choice of arch bridge design. The arch bridge is a deck type arch bridge, arch bridge and ends up full bridge by an interdisciplinary approach across the valley, the net span arch bridge is 120m, rise span ratio is 1/5. The main arch section of the box section, construction on the arch is hollow, ventral holes pier of reinforced concrete pier, ventral holes of precast hollow plate upper structure using standard span 8.4m. Precast T beam bridge the upper part adopts the standard span 14m. The main arch used catenary arch axis, according to Bo software trial to determine the bridge.

The second step is to calculate structure, which is the most crucial modeling, the final calculation is correct, largely depends on the model built is correct. The design and calculation of the \into the model parameters and the calculation of Fu, give a good model unit. Add the constraint Declaration on the model established after the completion of phase into the calculation. The software can calculate the internal force of the control section of the.

After the completion of the work, he will check for arch structure, the most important thing is to crack width calculation of bearing capacity and arch arch section.

Keywords: reinforced concrete arch bridge; deck type ; structure calculation; Arch bridge checking

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贵州大学本科毕业论文(设计) 第 1 页

第一章 基本资料、技术标准及设计要求

1.1 基本资料

黄家大坡大桥位于毕节地区黔西县。主桥为净跨120m上承式拱桥,桥位处的地形资料如图1.1所示。

图1.1 高过河大桥桥位处地形资料

1.2 技术标准

1.2.1 主要技术指标

设计荷载:公路—I级

桥面宽度:0.5m(防撞栏杆)+10.25m(车行道)+0.5m(防撞栏杆) 桥面横坡:2%

平面线型:全桥位于直线段上

桥面铺装:底层为厚度10cm厚C40混凝土防水层,面层为6cm厚沥青混凝土。 1.2.2 材料及工艺

混凝土:主拱圈采用C50,容重26kN/m3;立柱、盖梁、桥面板、防撞栏杆均采用C40,容重25kN/m3;承台及桩基采用C30,容重24kN/m3。

普通钢筋:I、II级钢筋。 1.2.3 设计依据规范

《公路桥涵设计通用规范》(JTG D60-2004)

《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004) 《公路桥涵地基与基础设计规范》(JTJ 024-85)

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