預(yù)應(yīng)力連續(xù)梁橋設(shè)計(jì)

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摘 要

畢業(yè)設(shè)計(jì)主要是關(guān)于小跨度預(yù)應(yīng)力混凝土連續(xù)梁橋上部結(jié)構(gòu)的設(shè)計(jì)。預(yù)應(yīng)力混凝土連續(xù)梁橋以結(jié)構(gòu)受力性能好、變形小、伸縮縫少、行車平順舒適、養(yǎng)護(hù)工程量小、抗震能力強(qiáng)等而成為最富有競爭力的主要橋型之一。受時(shí)間和個(gè)人能力的限制，本次畢業(yè)設(shè)計(jì)沒有具體涉及到下部結(jié)構(gòu)、橫向預(yù)應(yīng)力及豎向預(yù)應(yīng)力的設(shè)計(jì)。
設(shè)計(jì)橋梁跨度為2×30m,為單箱雙室，橋面寬12m，分為2車道。主梁施工采用滿堂支架施工。
設(shè)計(jì)過程如下：
首先，確定主梁主要構(gòu)造及細(xì)部尺寸，它必須與橋梁的規(guī)定和施工保持一致，設(shè)計(jì)采用箱形梁。頂板、底板厚度沿全橋保持不變,均為0.25m。
其次，利用橋梁博士分析內(nèi)力結(jié)構(gòu)總的內(nèi)力(包括恒載和活載的內(nèi)力計(jì)算)。用于計(jì)算的內(nèi)力組合結(jié)果也由橋梁博士計(jì)算而得，從而估算出縱向預(yù)應(yīng)力筋的數(shù)目，然后再布置預(yù)應(yīng)力鋼絲束。
再次，計(jì)算預(yù)應(yīng)力損失及次內(nèi)力，次內(nèi)力包括先期恒載徐變次內(nèi)力、先期預(yù)應(yīng)力徐變次內(nèi)力、局部溫度變化次內(nèi)力。
然后進(jìn)一步進(jìn)行截面強(qiáng)度的驗(yàn)算，其中包括承載能力極限狀態(tài)和正常使用極限狀態(tài)。在正常使用極限狀態(tài)驗(yàn)算中包括計(jì)算截面的混凝土法向應(yīng)力驗(yàn)算、預(yù)應(yīng)力鋼筋中的拉應(yīng)力驗(yàn)算、截面的主應(yīng)力計(jì)算

關(guān)鍵詞：預(yù)應(yīng)力混凝土連續(xù)梁橋 次內(nèi)力 支架現(xiàn)澆施工

Abstract
The graduate design is mainly about the design of superstructure of short-span pre-stressed concrete continuous box Girder Bridge. Pre-stressed concrete continuous Girder Bridge become one of main bridge types of the most full of competion ability because of subjecting to the dint function with the structure good, having the small deformation, few of control joint, going smoothly comfort, protected the amount of engineering small and having the powerfully ability of earthquake proof and so on. For time and ability limited, the design of the substructure, transverse pre-stressing and vertical pre-stressing is not considered.
The spans of the bridge are 2×30 m, main beam is respective designed, each suit has one box two room and two traffic ways, the width of the bridge surface is 12m.
The procedure of the design is listed below:
The first step as to dimension the structural elements and details of which it is composed, it can’t and certainly should without being fully coordinated with the planning and working phrases of the project. Considering the distorting stiffness and the bending stiffness, box birder goes as second-parabolic curve, for second-parabolic curve is generally similar to the change of continuous bridge’s bending moments along. The section at the support is strengthened by the provision of thickened webs , bottom slabs and a cross beam , the thickness of the bottom slab and the top slab is 0.25m.
The second step is to use Dr.Bridge3.03 to analyze internal gross force of the structures (including dead load and lived load), the internal force composition can be done by using the compute results. According to the internal force composite, the eva luated amount of longitudinal tendons can be worked out, then we can distribute the tendons to the bridge.
The third step is to calculate the loss of pre-stressing and secondary force due to pre-stressing, first dead loads and temperature, bearing displacement, and so on.
The last step is checking the main cross section. The work includes the load-caring capacity ultimate state and the normal service ability ultimate state as well as the main section’s being out of shape.

Key Words: grade separated Pre-stressed concrete continuous girder bridge Secondary force Full scaffold construction

目 錄
第1章 緒論 1
1.1 預(yù)應(yīng)力混凝土連續(xù)梁橋概述 1
1.2 畢業(yè)設(shè)計(jì)的目的與意義 1
第2章 橋跨總體布置及結(jié)構(gòu)尺寸擬定 3
2.1 尺寸擬定 3
2.1.1 立截面 3
2.1.2 橫截面 3
2.1.3 梁高 4
2.1.4 細(xì)部尺寸 4
2.2 主梁分段與施工階段的劃分 5
2.2.1 分段原則 5
2.2.2 具體分段 6
2.2.3 施工方法及注意事項(xiàng) 6
第3章 荷載內(nèi)力計(jì)算 7
3.1 恒載內(nèi)力計(jì)算 7
3.2 活載內(nèi)力計(jì)算 10
第四章 預(yù)應(yīng)力鋼束的估算與布置 11
4.1 計(jì)算原理 11
4.2 預(yù)應(yīng)力鋼束的估算 15
4.3 預(yù)應(yīng)力鋼束的布置 15
4.3.1 布束原則 15
4.3.2 具體布置 16
第五章 全橋結(jié)構(gòu)安全驗(yàn)算 17
5.1 全橋安全驗(yàn)算信息輸入 17
5.2 全橋結(jié)構(gòu)安全驗(yàn)算 17
5.2.1 承載能力極限狀態(tài)驗(yàn)算 17
5.2.2 正常使用階段驗(yàn)算 17
5.3 施工階段組合應(yīng)力驗(yàn)算 20
第6章 橋墩設(shè)計(jì) 22
6.1 截面選擇 22
6.2 橋墩計(jì)算模型的建立 22
6.3 內(nèi)力計(jì)算 23
6.4 計(jì)算配筋 24
6.5 結(jié)構(gòu)安全驗(yàn)算 24
參考文獻(xiàn) 25
致謝語 26
附錄A 27
附錄B 34