【正文】 s heavy traffic, the bridge has bee designed to have a 3 percent maximum slope. To ensure bridge longevity and facilitate deck, replacement operations, engineers will use reinforcing bars instead of post tensioning tendons in the deck slab. Reinforcing bars will also be used as ties in the footings to resist lateral thrust between the inclined tower legs. Builtup Ishaped steel beams spaced 4 m apart will form the floor beams and will match the m height of the connecting edge girders. The top flanges of the floor beams will follow the cross, slope of the deck. Three longitudinal beams will provide temporary lateral support for the floor beam top flanges before the CIP concrete strips reach sufficient strength. The top flanges of the longitudinal beams will be wide enough to serve as forms for the CIP concrete strips between precast deck panels. The bridge is designed so that the superstructure of the main span can be erected by delivering the major structural ponents to the deck from the towers. The boxshaped steel edge girders have high tensional strength and are designed to cantilever during floor beam erection. With an inclined outside web and a vertical inside web, this m high, boxshaped steel edge girders will deepen to m as they approach the ends to match the depth of the concrete box girders in the approaches. The top flange will be m wide and the bottom flange will be m wide. To make the concrete deck and steel edge girder posite, shear studs will be welded to the flange. Four rubber bumpers at the deck level of each tower are designed to transfer horizontal wind loads from the superstructure. Bumpers eliminate the use of bearings, which require costly, laborintensive inspections and replacements. The bumpers are easily accessible for inspection and can be replaced by a single person. Cable anchors are located insi。s two Ashaped towers will straddle the 500 m main span and will stand as stylized representations of the traditional Thai greeting, the hands steep led together. The superstructure is a steel frame posite with a concrete deck. Stay cables spaced at 12 m intervals along the edge girders are designed to carry the superstructure load. Three anchor piers on each side will provide stability. The bridge features a symmetrical profile and slopes XX 大學畢業(yè)設(shè)計（論文） 38 no more than 3 percent. The bridge was designed for 208 KN loads from trucksloads 30 percent higher than those set forth by the American Association of State Highway and Transportation Officials in the 16th edition of its Standard Specifications for Highway Bridges (1996). The hollow legs of the two 187 m high towers are made of reinforced concrete. A horizontal strut just below deck level provides lateral support for the slender legs and reduces deflection. The legs, each supported by two 24 by 24 by 4 m footings, join at the top to form a chamber for cable anchors. Decorative spheres 3 m in diameter and spires 8 m tall at the top of the towers will be gilded in traditional Thai style. The two towersone located in shallow water on the east bank, the other behind a wharf on the west bankwill be situated away from the main navigation channel to eliminate the possibility of collisions with the bridge and ensure that marine traffic and wharf operations can proceed unimpeded. The three anchor piers will be situated behind each tower on the bridge39。 and Parsons Brinckerhoff (PB), of New York City. Once the joint venture was formed, designers began a feasibility study of the Chao Phraya River crossing and set about determining the most suitable type of crossing. Tunnels and cablestayed bridges were developed and evaluated. Eventually, however, it became clear that a bridge would be more economical, would not interrupt marine traffic, and would best lend itself to the highway interchange. In 1999 engineers began to design the SOBRR. The Chao Phraya River Bridge design was led by PB and supported by AEC and TEC. Conceptual and preliminary designs were prepared by PB39。 only the eastern half of the southern legthe Southern Outer Bangkok Ring Road, or SOBRRremains to be constructed. Scheduled for pletion in 2021, the 21 km elevated viaduct will incorporate four major interchanges and a cablestayed bridge over the Chao Phraya River. With a main span of 500 m and two side spans of m, the Chao Phraya River Bridge will be the longest in Thailand. XX 大學畢業(yè)設(shè)計（論文） 37 In 1996 the Department of Highways retained a joint venture team of consultants to design the SOBRR. The design team included Asian Engineering Consultants (AEC), Thai Engineering Consultants (TEC), and Siam General Engineering Consultants, all of Bangkok。s notoriously heavy traffic but also contribute a new architectural symbol to the capital city. By Ruchu Hsu, RE. The bridge will carry four lanes of traffic in each direction. The upper portion of each tower will have an enclosed chamber for cable anchors, a m square opening at the bottom providing easy access for maintenance and inspection. For the past 20 years, Thailand39。 XX 大學畢業(yè)設(shè)計（論文） 36 附錄 A Bridge to the Future The Chao Phraya River Bridge is designed to acmodate marine traffic. The 500 m main span will provid m of vertical clearance, and the two towers will be situated away from the main navigation channel. The final ponent of Thailand39。 經(jīng)過四年美好的大學生活，我對交大的感情與日俱增，在即將畢業(yè)離校之際，深感留戀，忠心感謝學校領(lǐng)導和老師的悉心培育，使我不斷成長、成熟。經(jīng)過緊張的策劃和設(shè)計，我從設(shè)計中受益非淺。可以說老師和同學的幫助是我們設(shè)計得以順利完成的有力保障。 藺 老師對學生要求嚴格，考勤到位，對自己同樣要求嚴格，每天都按時到設(shè)計室，了解我們的設(shè)計進度，輔導設(shè)計內(nèi)容，為我們提出設(shè)計的方法，并指出了我們設(shè)計中的許多不足。 在這兩個多月設(shè)計期間，學校領(lǐng)導密切關(guān)注我們的畢業(yè)設(shè)計的進度與質(zhì)量，許多老師花費 了大量的時間及精力，親歷監(jiān)督和指導。感謝各位小組成員的鼎力相助。欣喜之余 ,各種困難歷歷在目 ,遇到困難時的沮喪 ,解決后的狂喜 ,挫敗感、成就感交織交替 ,在此過程中煅煉了處理事物的能力，受益頗多 。我堅信這次的畢業(yè)設(shè)計所給我的啟示能幫助我在以后的學習或者工作生活中完美地完成每一件