40m預應力混凝土簡支t型梁橋設計計算書(已修改)

　

【正文】 鄭州大學畢業設計題 目： 40m 預應力混凝土簡支 T 型梁橋設計 （凈14+2 人行道） 指導教師： 職稱： 學生姓名： 學號： 專 業： 院 （ 系 ） ： 完成時間： 年月 日摘要 本設計從最基本的設計方法入手，重點進行了主梁的設計，掌握了主梁的設計方法，其它部分的設計就可以仿照主梁設計進行。本設計的主要內容如下：縱橫斷面布置：根據規范要求和工程實踐經驗確定主梁間距與主梁片數和主梁高度及各截面主要尺寸。主梁設計：內力計算由恒載內力和活載內力計算組成。恒載內力由結構力學可求出，而活載內力計算時要利用按修正偏心壓力法計算得出的荷載橫向分布系數。根據計算得出的各種內力組合確定設計控制內力進而對預應力鋼束數進行估算。按后張法制作主梁，采用直徑 70mm 的預埋鐵皮波紋管和 OVM 錨固，計算各種預應力損失得出有效預應力，對主梁進行強度、應力和變形驗算。橫隔梁設計：設置橫隔梁是為了保證各主梁共同受力和加強結構整體性，本設計中采用偏心壓力法進行橫隔梁計算。鑒于橋梁跨中處橫隔梁受力最大，只計算跨中橫隔梁內力，其余橫隔梁可依據中橫隔梁偏安全地選用相同的截面尺寸和配筋。行車道板設計：本設計中行車道板的受力圖示為單向板。關鍵詞：T 形梁；預應力；混凝土橋 ABSTRACTThis design begins with basic method and gives most content to the design of main beams. When the method of main beams designing is mastered, we can go on the designing of other parts.The main content of this design is as followings:The arrange of longitudinal section and lateral section：According to the specification and the experience of practical engineering, we can decide the distance of girders, the number of the girders, the height of the main beams and the main size of each section.Main beams design： Internal forces include invariable force and variable force. We can use the method of the structural mechanics. To calculate the variable internal force, we calculate the lateral direction coefficient of the load with the method of corrected eccentricity pressures. with the result of the calculation, we can obtain the control internal force, and we can approximately decide the number of the prestressed concrete band. design the main beams with posttensioning method, selecting preburry corrected tube (F 70) amp。 OVM anchoring. Then calculate the loss of the prestress and obtain the valid prestress and examine the strength, stress, and transform of the main beams.Crossing beam designing：To make sure that all main beams rear the load together and to enhance the globality of the construction, this design goes on the crossing beam calculation with the method of corrected eccentricity pressures. We only calculate the internal force of the middle crossing beam because of the maximum force is in the place of the middle of the span.Driveway plank designing：In this design, the force diagram of the driveway plank is single direction plank.Key words: Tbeam；prestress；concrete bridge目 錄摘要 .................................................................................................................................................IABSTRACT..................................................................................................................................II1 緒論 ..........................................................................................................................................3 預應力混凝土簡支梁橋的構造特點 .....................................................................................3 發展概況 .................................................................................................................................3 本文設計主要內容 .................................................................................................................32 設計資料及構造布置 ..............................................................................................................4 設計目的 .................................................................................................................................4 基本資料 .................................................................................................................................4 主梁間距與主梁片數 .............................................................................................................5 主梁跨中截面主要尺寸擬定 .................................................................................................6 主梁高度 ......................................................................................................................6 主梁截面細部尺寸 ......................................................................................................6 計算截面幾何特征 ......................................................................................................7 檢驗截面效率指標 ......................................................................................................8 橫截面沿跨長的變化 .............................................................................................................8 橫隔梁的設置 .........................................................................................................................83 主梁計算 ..................................................................................................................................9 永久作用效應計算 .................................................................................................................9 永久作用集度 ..............................................................................................................9 永久作用效應 ............................................................................................................10 可變作用效應計算（修正剛性橫梁法） ...........................................................................11 沖擊系數和車道折減系數 ........................................................................................11 計算主梁的荷載橫向分部系數 ................................................................................11 車道荷載的取值 ........................................................................................................14 計算可變作用效應 ....................................................................................................15 主梁內力組合 .......................................................................................................................19 預應力鋼束的估算及其布置 ...............................................................................................20 跨中截面鋼束的估算和確定 .................................................................................