【正文】 續(xù)表 22 頻 率 第一次適線 第二次適線 第三次適線 2 mVsVQCCC???? 2 mVsVQCCC???? 3 mVsVQCCC???? 20 3918 4000 3809 50 2422 2340 2177 75 1524 1415 1469 90 952 843 1143 95 707 599 1034 99 354 272 979 取 /mQ m s? ， Cv=， 并近似 3 ??作為最后采用的理論頻率曲線。 福州大學(xué)本科生畢業(yè)設(shè)計(jì) 8 第二章 水文計(jì)算 設(shè)計(jì)洪峰流量計(jì)算 資料審查 該站實(shí)測(cè)和調(diào)查洪水，經(jīng)審查，證明資料可靠，具有一致性和代表性，實(shí)測(cè)流量年限為 37 年，超過(guò)了規(guī)范不應(yīng)少與 30 年的要求，屬于長(zhǎng)系列流量資料推求設(shè)計(jì)洪水的情況。在合攏段兩側(cè)之間設(shè)置能傳遞結(jié)構(gòu)內(nèi) 力的臨時(shí)連接構(gòu)件。兩端邊跨現(xiàn)澆段各為 。橋臺(tái)采用埋置式肋型橋臺(tái)，基礎(chǔ)采用 4φ 的鉆孔灌注樁。箱梁高度從距墩中心 2次拋物線變化。由于鋼束對(duì)截面幾何特性的影響，溫度，沉降等內(nèi)力也需要重新計(jì)算，但其與鋼束估算時(shí)計(jì)算結(jié)果差別非常小。由于上部覆蓋有不同厚度的卵石層，鑒于該層承載力不能滿足荷載要求及沖刷 等問(wèn)題，宜采用樁基，并根據(jù)荷載選擇適當(dāng)?shù)臉兜赘叱?，基礎(chǔ)亦可置于強(qiáng)風(fēng)化巖石上。主要由硅化英安巖、硅化安石巖，熔巖等火山巖組成，極堅(jiān)硬，磨圓度較好，粒徑 4～ 15cm，含量 50%以上，最大粒徑達(dá) 60cm，且隨深度增加粒徑增大，一般在 層底部 1m 左右均為以漂石為主，砂、砂壤土填充，較密實(shí)，但未固結(jié)，常夾有 ～ 之薄層砂壤土透鏡體，層厚 ～，左岸最厚達(dá) ，層頂板高程為 ～ ，容許承載力為 400KPa。全風(fēng)化花崗閃長(zhǎng)巖為基層巖層，較穩(wěn)定，工程性能好，為主要持力層，層厚 21— 30m，上部風(fēng)化透徹，向深部逐漸減弱，項(xiàng)界靠右岸較平緩、上下游變化不大，而靠左岸卻為上游向下游傾斜。 非預(yù)應(yīng)力鋼筋 受力主鋼筋用 HRB335 鋼筋 (? 12～ 28)， skf =335MPa， sdf =280MPa；非受力鋼筋用 R235 鋼筋 (? 8～ 10)， skf =235MPa， sdf =195MPa。 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)。 通過(guò)認(rèn)真分析橋址的水文情況，調(diào)查地質(zhì)勘測(cè)資料，繪制河床斷面圖，初步擬定了兩種方案，即主跨為 53m+85m+53m 預(yù)應(yīng)力混凝土連續(xù)梁橋設(shè)計(jì)方案和主跨為95m 的鋼管混凝土拱橋的設(shè)計(jì)方案。 關(guān)鍵詞：預(yù)應(yīng)力混凝土，連續(xù)梁橋，安溪東門大橋 II Design of 53+85+53m prestressed concrete continuous beam bridge Abstract This is a paring of design and structural design of the East Gate Bridge,according to designing assignment and the standard of road and bridge designs. With a scriously study of hydrologic and geology data in the bridge site ,I make the first two plans of the bridge:53m+85m+53m prestressed concrete continuous beam bridge and a Through CFST RigidFramed Tied Arch Bridge with Main Span the purpose of making the type of the bridge corresponding with the ambience and cost saving,with the consideration of the design and construction,I choose the former to be my final design. According to the first plan, the union of the project survey material, the hydrology puted result, the technical standard request, the design standard stipulated that, and refers to the bridge design example which has carried on to make this bridge the general arrangement design. The procedure of the design is listed below ： The first step as to dimension the site position, bridge overall structure, bridge superstructure, substructure and floor system, and using CAD software plan bridge general layout and detail dimensional drawing. The second step is to use Doctor Bridge 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 the results, the final design of the East Gate Bridge meets the requirements of specification. Keyword : prestressed concrete, continuous beam bridge , East Gate Bridge I 目 錄 中文摘要 ...................................................... I Abstract ..................................................... II 第一章 設(shè)計(jì)說(shuō)明 ................................................ 1 工程概況 ............................................................... 1 設(shè)計(jì)標(biāo)準(zhǔn)與規(guī)范 ......................................................... 1 技術(shù)標(biāo)準(zhǔn)及技術(shù)條件 ..................................................... 1 主要材料 ............................................................... 2 混凝土 .......................................................... 2 預(yù)應(yīng)力鋼束及錨具 ................................................ 2 非預(yù)應(yīng)力鋼筋 .................................................... 2 其他材料 ........................................................ 2 主要地質(zhì)條件 ........................................................... 3 設(shè)計(jì)要點(diǎn) ............................................................... 5 設(shè)計(jì)特點(diǎn) ........................................................ 5 上部結(jié)構(gòu) ........................................................ 5 下部結(jié)構(gòu) ........................................................ 6 施工要點(diǎn) ........................................................ 6 第二章 水文計(jì)算 ................................................ 8 設(shè)計(jì)洪峰流量計(jì)算 ....................................................... 8 繪制經(jīng)驗(yàn)頻率曲線 ................................................ 9 按無(wú)偏估計(jì)值公式計(jì)算統(tǒng)計(jì)參數(shù) .................................... 9 適線法選配皮爾Ⅲ 型理論頻率曲線 ................................ 10 設(shè)計(jì)洪水位計(jì)算 ........................................................ 11 確定橋孔長(zhǎng)度 .......................................................... 13 用經(jīng)驗(yàn)公式計(jì)算 .................................................. 13 用沖刷系數(shù)法計(jì)算 ................................................ 13 橋面標(biāo)高確定 .......................................................... 14 雍水高度 ........................................................ 14 波浪高度 ........................................................ 14 橋面標(biāo)高 ........................................................ 15 沖刷計(jì)算 .............................................................. 15 一般沖刷計(jì)算 .................................................... 15 局部沖刷計(jì)算 .................................................... 17 第三章 結(jié)構(gòu)方案設(shè)計(jì) ........................................... 21 橋型方案比選 .......................................................... 21 結(jié)構(gòu)總體設(shè)計(jì) ...............................