【正文】
2021 年 6 月 西南交通大學(xué)本科畢業(yè)設(shè)計(jì)(論文) 第 I 頁(yè) 評(píng) 語(yǔ) 院 系 土木工程 專 業(yè) 土木工程 年 級(jí) 2021 姓 名 趙玉銀 題 目 某跨線立交 (26+2 46+26)m 預(yù)應(yīng)力砼連續(xù)梁設(shè)計(jì) 指導(dǎo)教師 劉元久 評(píng) 語(yǔ) 指導(dǎo)教師 (簽章 ) 評(píng) 閱 人 評(píng) 語(yǔ) 評(píng) 閱 人 (簽章 ) 成 績(jī) 答辯委員會(huì)主任 (簽章 ) 年 月 日 西南交通大學(xué)本科畢業(yè)設(shè)計(jì)(論文) 第 II 頁(yè) 畢業(yè)設(shè)計(jì)(論文)任務(wù)書(shū) 班 級(jí) 土木 13 班 學(xué)生姓名 趙 玉 銀 學(xué) 號(hào) 20211246 發(fā) 題日期: 2021 年 4 月 3 日 完成日期: 2021 年 6 月 20 日 1 設(shè)計(jì)題目 某跨線立交 (26+2 46+26)m 預(yù)應(yīng)力砼連續(xù)梁設(shè)計(jì) 2 橋梁技術(shù)標(biāo)準(zhǔn) 設(shè)計(jì)荷載:公路 Ⅰ級(jí) 橋全寬 : 雙幅 2 (2 +)m,單箱雙室 橋下凈空:≥ 設(shè)計(jì)車速: 60km/h 橋梁縱坡:≤ 5% 橋梁橫坡: % 地震烈度: 7 度設(shè)防 , 場(chǎng)地類別為Ⅱ類 , 地震加速度 。 橋位處地形較為平坦,自然地坪標(biāo)高 — ,地勢(shì)大致呈南向西高、北東低的趨勢(shì),相對(duì)高差 。 亞砂土,厚度 — ,部分地段夾條帶亞粘土簿層或細(xì)砂。 橋區(qū)地下水主要為埋藏于第四系砂卵石土中的孔隙潛水,對(duì)砼無(wú)侵蝕性。 橋區(qū)位置及其附近無(wú)影響工程穩(wěn)定性的不良地質(zhì)現(xiàn)象,屬相對(duì)穩(wěn)定地段。 預(yù)應(yīng)力管道 預(yù)應(yīng)力管道均采用鍍鋅金屬波紋管。供貨廠家必須取得ISO9002 和 BSI質(zhì)量體系認(rèn)證證書(shū)。 熟悉有關(guān)設(shè)計(jì)規(guī)范的應(yīng)用和相關(guān)橋梁結(jié)構(gòu)計(jì)算軟件的使用。 西南交通大學(xué)本科畢業(yè)設(shè)計(jì)(論文) 第 VI 頁(yè) 9 時(shí)間及進(jìn)度安排 本屆畢業(yè)設(shè)計(jì)總時(shí)間為 12 周,即第 7周至第 18 周 (),本學(xué)期第16周進(jìn)行畢業(yè)設(shè)計(jì)的相關(guān)準(zhǔn)備工作,具體安排如下, 第 1 6周: (包括規(guī)范) 《橋梁電算》課程 件 AUTOCAD、 WORD 等 第 7周:布置任務(wù),擬定尺寸,準(zhǔn)備計(jì)算數(shù)據(jù); 第 8周:結(jié)構(gòu)內(nèi)力計(jì)算;內(nèi)力組合 。答辯 10 閱讀文獻(xiàn): 公路橋涵鋼設(shè)計(jì)手冊(cè)《梁橋 (上冊(cè)、下冊(cè) )》人民交通出版社, 2021 年 邵旭東主編 ,公路建設(shè)百問(wèn)叢書(shū)《橋梁設(shè)計(jì)百問(wèn)》 ,人民交 通出版社, 2021年; 劉作霖,徐興玉編,《預(yù)應(yīng)力 T 型剛構(gòu)式橋》,人民交通出版社, 1982 年; 范立礎(chǔ),《預(yù)應(yīng)力混凝土連續(xù)梁橋》,人民交通出版社, 1988; 姚玲森主編,《橋梁工程》,人民交通出版社; 王文濤,《剛構(gòu) — 連續(xù)梁橋》,人民交通出版社, 。 1劉效堯,朱新實(shí)主編,預(yù)應(yīng)力技術(shù)及材料設(shè)備,人民交通出版社, 。 受時(shí)間和個(gè)人能力的限制,本次畢業(yè)設(shè)計(jì)沒(méi)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)。主梁的高度呈二次拋物線變化,因?yàn)槎螔佄锞€近似于連續(xù)梁橋彎距的變化曲線 。 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。 關(guān)鍵詞:預(yù)應(yīng)力混凝土連續(xù)梁橋、次內(nèi)力、滿堂支架施工 西南交通大學(xué)本科畢業(yè)設(shè)計(jì) (論文) 第Ⅸ 頁(yè) ABSTRACT The graduate design is mainly about the design of superstructure of shortspan prestressed concrete continuous box Girder Bridge . Prestressed concrete continuous Girder Bridge bee one of main bridge types of the most full of petion ability because of subjecting to the dint function with the structure good, having the small defomation, few of control joint,going smoothly fort,protected the amout 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 prestressing and vertical prestressing is not considered. The spans of the bridge are 26+246+26m,main beam is respective designed, each suit has one box two room and three traffic ways, the width of the bridge surface is 14m. The major girder applies Full scaffold construction , symmetric equilibrium construction . The procedure of the design is listed below: The first step as to dimension the structural elements and details of which it is posed, 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 secondparabolic curve, for secondparabolic 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 . The second step is to use BSAS software to analyze internal gross force of the structures (including dead load and lived load), the internal force position can be done by using the pute results. According to the internal force posited, the evaluated amount of longitudinal tendons can be worked out, then we can distribute the tendons to the bridge. The third steps is to calculate the loss of prestressing and secondary force due to prestressing, first dead loads and temperature, bearing displacement, and so on. The last steps is checking the main cross section. the work includes the loadcaring capacity ultimate state and the normal service ability ultimate state as well as the main section’s being out of shape. In addition , the torsion of box girder, wind loads, seismic loads and the dynamic 西南交通大學(xué)本科畢業(yè)設(shè)計(jì) (論文) 第Ⅸ 頁(yè) properties aren’t taken into account during the design. Key Words: grade separated Prestressed concrete