土木工程外文翻譯-文庫吧資料
2025-01-21 02:18本頁面
【正文】 Department of Transportation (WSDOT) has menced a prehensive seismic analysis program to evaluate the vulnerability of the exiting bridges under a seismic event and to determine the most effective retrofit alternative. The Bridge investigated in this study is one of the representative MSSS prestressed bridges built in WA. The bridge was built in the 1960’s and widened twice from its both sides, in 1979 and 2001. Apparently, the last widening was conducted based on more conservative seismic design and detailing provisions, where confinement and lapsplice requirements were improved. The primary objective of this research project is to determine the seismic vulnerability of the bridge in order to develop the required retrofit measure. The seismic vulnerability of the bridge is evaluated using two seismic evaluation methods presented in the Federal Highway Administration (FHWA) Seismic Retrofitting Manual for Highway Bridges [1], namely, Method C and Method D2.8。這一研究項目的主要目的是，確定橋梁在地震中的薄弱點，因而可以大力發(fā)展改進措施。這項研究調(diào)查的多座多跨簡支預制橋中，其中具有代表性的一座坐落在華盛頓州。承臺是一種常用的支座，支承在條形基礎(chǔ)或深基礎(chǔ)上?？拐鹨?guī)范規(guī)定一定要保證適當?shù)难诱剐院秃侠淼目拐鹦阅?，比如鋼筋閉合長度、搭接長度和梁支座長度可以不予考慮，只有一組梁是用來抵抗支承橋面發(fā)生橫向運動的。而柱子的數(shù)量取決于橋的傾斜量及路面寬度，擴展基礎(chǔ)或樁地基都是過去共同使用的基礎(chǔ)系統(tǒng)。由此，地基條件或其他組件的改變可能是因為引入了地質(zhì)條件。這個系統(tǒng)被科學家們證實,在當時是易于設(shè)計和建造橋梁的。waste management.INTRODUCTIONDespite the economic and environmental benefits of concrete produced with recycled concrete aggregates (RCA)1 dubbed RCAconcrete, the construction industry has not embraced it, especially for structural applications, partly due to previous findings that have concluded that RCAconcrete is inherently inferior to conventional concrete made with natural In the past, mixture proportioning methods for conventional concrete have been applied with minor modifications to design RCAconcrete mixtures. A principal modification has been the increase in the cement content, with no special consideration given to the residual mortar volume fraction of Although by suitable adjustment of the cement content and watercement ratio (
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