【正文】
l as far as possible is using the prestressed concrete beam plate bridge, because this kind of bridge has makes use of local materials, the industrialization construction, the durability is good, patible, integrity good as well asartistic and so on many kinds of merits. This design uses assembly type simple support T beam structure, its superstructure by the king post, septum transversum beam, the lane board, the bridge floor part and the support and so on is posed, the obvious king post is the bridge main carrier. Its king post connects into the whole through the crossbeam and the lane board, enable the vehicles load to have the good traverse between various king posts .Bridge floor part including positions and so on flooring, expansion and contraction installment and parapet, these structures although is not the bridge main carrier, but their design and the construction relates the bridge whole directly the function and the security, here has also given the detailed explanation in this design. This design mainly steps the sagging moment control, when the span increases, cross the bending moment which produces by the dead load and the live load the sharp growth, is the material intensity majority of consumes for the structure gravity, thus limits the spanning ability, this design uses the 27m standard span, has solved this problem reasonably. In the design through the king post endogenic force putation, the stress steel bar arrangement, king post section intensity and stress checking calculation, lane board and support, pillar Taiwan and so on designs, a structure assembly type prestressed concrete simple support T beam bridge, the checking calculation pletely has conformed to the requirement perfectly, uses the method and the new standard corresponds. This design has highlighted the prestressed with emphasis in the bridge application, this has also been manifesting our country bridge trend of development. Key word: Prestressed, Simple support T beam,Tensioning,Stress checking calculation 目 錄前言......................................................................1第 1 ..................................................1 濱德高速 K72+ 中橋工程地質(zhì)資料...................................1 氣候條件 .........................................................1 地質(zhì)資料............................................................2 設(shè)計(jì)規(guī)范..............................................................3第 2 章 橋型設(shè)計(jì)方案....................................................5 方案一:預(yù)應(yīng)力鋼筋混凝土簡支梁(錐型錨具).............................5 基本構(gòu)造布置........................................................5 設(shè)計(jì)荷載............................................................5 方案二:鋼筋混凝土箱形拱橋 ...........................................6 方案簡介............................................................6 尺寸擬定 ........................................................6 橋面鋪裝及縱橫坡度..................................................7 施工方法 ........................................................7 總結(jié) ...............................................................7第 3 章上部結(jié)構(gòu)設(shè)計(jì) .....................................................8 設(shè)計(jì)資料及結(jié)構(gòu)布置 ..................................................8 設(shè)計(jì)資料............................................................8 橫截面布置 .........................................................8 橫截面沿跨長變化 .................................................11 橫隔梁的布置 ....................................................11 主梁作用效應(yīng)計(jì)算.....................................................11 恒載內(nèi)力計(jì)算 ....................................................11 活載內(nèi)力計(jì)算 ....................................................13 計(jì)算橫向分布系數(shù) .................................................13 計(jì)算最大彎矩和最大剪力 ..........................................17 主梁效應(yīng)作用組合...................................................21 鋼筋面積的估算及鋼束布置 ..........................................21 b39。我國從“七五”開始,公路建設(shè)進(jìn)入了高等 級公路建設(shè)的新階段,近幾年隨著公路等級的不斷提高,路橋方面知識得到越來越多的 應(yīng)用,同時,各項(xiàng)規(guī)范也有了較大的變動,為掌握更多路橋方面知識,我選擇了 30m 裝 配式預(yù)應(yīng)力混凝土簡支 T 梁設(shè)計(jì)這一課題。設(shè)計(jì)內(nèi)容包括擬定橋梁縱,橫斷面尺寸、上部結(jié)構(gòu)計(jì)算,下 部結(jié)構(gòu)計(jì)算,施工組織管理與運(yùn)營,施工圖繪制,各結(jié)構(gòu)配筋計(jì)算,書寫計(jì)算說明書、 編制設(shè)計(jì)文件這幾項(xiàng)任務(wù)。按照新規(guī)范公路 I 級車道 荷載進(jìn)行布置活載,并進(jìn)行了梁的配筋計(jì)算,估算了鋼絞線的各種預(yù)應(yīng)力損失,并進(jìn)行 預(yù)應(yīng)力階段和使用階段主梁截面的強(qiáng)度,正應(yīng)力及主應(yīng)力的驗(yàn)算。主要依據(jù)《公路鋼筋 混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范》(JTG D0622004),《公路橋涵地基與基礎(chǔ)設(shè)計(jì) 規(guī)范》(JTJ 0248,《公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范》(簡稱《預(yù)規(guī)》) JTG D60—2004《公路橋涵設(shè)計(jì)通用規(guī)范》(簡稱《通用規(guī)范》) 在本次設(shè)計(jì)過程中,新舊規(guī)范的交替,電腦制圖的操作,都使我的設(shè)計(jì)工作一度陷 入僵局。 在此,對老師和同學(xué)們表示衷心的感謝。第 1 濱德高速 K72+ 大橋工程地質(zhì)資料 氣候條件 山東氣候?qū)倥瘻貛Ъ撅L(fēng)氣候類型。年 平均氣溫 11~14℃,由東北沿海向西南內(nèi)陸遞增,膠東半島、黃河三角洲年均在 12℃ 以下,魯西南在 14℃以上。極端最低氣溫在零下 11~20℃之間,極端最高氣溫 36~43℃。年平均降水量一般在 550~950 毫米之間,由東南向西北遞減。降水季節(jié)分布很不均衡,全年 降水量有 60~70%集中于 8 三個月,易形成澇災(zāi)。冬、春及晚秋易發(fā)生 旱象。黃褐色、棕黃色, 松散,可塑,稍濕,以亞粘土為主,表層為灰土墊層。棕 黃色,可塑,濕,光滑,中等韌性,中等干強(qiáng)度。褐黃 色、灰褐色,中密,濕,搖震反應(yīng)迅速,低干強(qiáng)度,低韌性。灰黃色, 密實(shí),飽和,以石英、長石、云母為主,級配良好,分選性差,磨圓度較高。黃 褐色,可塑,濕,稍有光滑,中等韌性,中等干強(qiáng)度,局部夾亞砂土薄層。棕黃 色,可塑~硬塑,濕,光滑,高干強(qiáng)度,中等韌性。 灰黃色,密實(shí),飽和,以石英、長石、云母為主,級配良好,分選性差,磨圓度較高?;?褐色,可塑,濕,光滑,中等干強(qiáng)度,中等韌性?;液稚?,密實(shí),飽 和,以石英、長石、云母為主,級配良好,分選性差,磨圓度較高。經(jīng)取水樣化驗(yàn)分析, 地下水 K++Na+含量為 ,Ca2+含量為 ,Mg2+含量為 ,CL 含量為 ,S042含量為 ,HCO3含量為 ,無侵蝕性 CO2 存在,PH=。表 11 基土各土層容許承載力表層次巖性層底標(biāo)高(m)容許承載力(kpa)1素巖土/23亞粘土亞砂土~1201304粉砂~1305亞粘土~1706粘土~1807粉砂~2008亞粘土~1309細(xì)砂未揭穿240表 12 基土各土層鉆孔灌注樁樁基參數(shù)表層次巖性樁尖土極限承載 力(kpa)樁周土極限摩阻力(kpa)抗剪強(qiáng)度C(kpa)φ(度)1素填土/30//2亞粘土/40//3亞砂土2004054粉 砂4004045亞粘土50040116粘 土60055//7粉 砂7004558亞粘土30045//9細(xì) 砂900507表 13 基土各土層比例系數(shù) m 和 m0 值層次巖性m 和 m0 值(KN/m4)1素填土/2亞粘土50003亞砂土60004粉 砂70005亞粘土100006粘 土120007粉 砂80008亞粘土40009細(xì) 砂12000 設(shè)計(jì)規(guī)范中華人民共和國交通部部頒標(biāo)準(zhǔn):(1)《公路橋涵設(shè)計(jì)通用規(guī)范》(JTG D602004)(2)《公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范》(JTG D622004)(3)《公路橋涵地基與基礎(chǔ)設(shè)計(jì)規(guī)范》(JTJ02485)(4)《公路圬工橋涵設(shè)計(jì)規(guī)范》(JTJ D612005)(5)《公路工程抗震設(shè)計(jì)規(guī)范》(JTJ00489)第 2 章 橋型設(shè)計(jì)方案 根據(jù)現(xiàn)橋位地形、水文條件,并綜合考慮工程的