土木工程外文翻譯-閱讀頁
2025-01-30 02:18本頁面
【正文】 A, the volume fraction and relevant property of each phase is accounted for. Because an RCAconcrete mixture proportioned by the EMV method does not suffer from the inferiorities of RCAconcrete proportioned by conventional methods, it is reasonable to assume, contrary to previous findings, that reinforced concrete members made of RCAconcrete thus proportioned will not experience larger deflection and lower ultimate flexural strength pared to reinforced concrete members produced with similar grade conventional concrete made entirely with natural aggregates.To verify this assumption, an extensive experimental study was carried out by testing under flexure a number of reinforced RCAconcrete beams made with coarse RCA and panion control beams made of concrete containing only coarse natural aggregate with similar properties as the coarse natural aggregate in RCA. The investigated properties include deflection, crack spacing, cracking moment, yielding moment, ultimate flexural strength, cracking pattern, and failure modes. Two different sources of RCA, designated RCAM and RCAV, were used in the study and are obtained from recycled concrete processing plants in Montreal (M) and Vancouver (V), respectively. The natural aggregate in RCAM was natural limestone, whereas that in RCAV was natural riverbed gravel. Further details on the characteristics of the RCA used in this study can be obtained from Fathifazl. 英文翻譯2外文原文出處：International Journal of Applied Science, Engineering and Technology 5:4 Shatarat and Adel Assaf .USA.分析多跨簡(jiǎn)支預(yù)制橋梁的抗震性能和要求華盛頓州在1950年和1960年期間所建造的橋梁一般都采用多跨簡(jiǎn)支（簡(jiǎn)稱MSSS）預(yù)制系統(tǒng)。設(shè)計(jì)師們使用預(yù)先設(shè)計(jì)的一整套部件，上層建筑和下部結(jié)構(gòu)組件的選擇是基于對(duì)某些全球性橋梁的特點(diǎn)和橋梁的尺寸來的，如柱子的高度，橋梁路面寬度，彎曲偏斜和跨度橋梁。這些橋梁的上層建筑包括支承于混凝土橋墩上的混凝土梁，橋墩通常是一根3英尺（）大的橫梁，一般靠很多3英尺（）長(zhǎng)的圓柱支承著。 華盛頓州1960年間在多跨簡(jiǎn)支預(yù)應(yīng)力混凝土橋梁的設(shè)計(jì)思路中，很少或者說根本沒有注意到地震力?？v向位移基本不常見，主梁和梁帽上方的接觸長(zhǎng)度假定足夠承擔(dān)縱向位移。最近，華盛頓州交通部（簡(jiǎn)稱WSDOT）全面將地震分析程序投入使用，用以評(píng)估現(xiàn)有橋梁在地震危害中的薄弱點(diǎn)，并確定最有效的改造方案。這座橋建于20世紀(jì)60年代,在1979年和2001年橋面先后拓寬了兩次。橋梁的地震薄弱性進(jìn)行評(píng)估使用的兩個(gè)地震評(píng)價(jià)方法，是聯(lián)邦公路管理局（簡(jiǎn)稱FHWA）在公路橋梁抗震加固改造手冊(cè)中所提出，就是方法C和方
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