土木工程專(zhuān)業(yè)英文翻譯(文件)
【正文】 prehensive experimental program. The effective moment of inertia was defined according to Eq.(2) if the reinforcement was FRP （2） Further research has been done in order to define an effective moment of inertia equation which is similar to that of Eq.(1), and converges to the cracked moment of inertia quicker than the cubic equation. Many researchers (Benmokrane et al. 1996。 Serviceability。 Fiberreinforced polymers。Critical Review of Deflection Formulas for FRPRC MembersCarlos Mota1。 Deflection。Statistics.Introduction Fiberreinforced polymer FRP reinforcing bars are currently available as a substitute for steel reinforcement in concrete structures that may be vulnerable to attack by aggressive corrosive agents. In addition to superior durability, FRP reinforcing bars have a much higher strength than conventional mild steel. However, the modulus of elasticity of FRP is typically much lower than that of steel. This leads to a substantial decrease in the stiffness of FRP reinforced beams after cracking. Since deflections are inversely proportional to the flexural stiffness of the beam, even some FRP overreinforced beams are susceptible to unacceptable levels of deflection under service conditions. Hence, the design of FRP reinforced concrete （FRPRC） is typically governed by serviceability requirements and a method is needed that can calculate the expected service load deflections of FRP reinforced members with a reasonable degree of accuracy. The objective of this paper is to point out the inconsistencies in existing deflection formulas. Only instantaneous deflections will be discussed in this paper.Effective Moment of Inertia Approach ACI 318 （ACI 1999）and CSA (CSA 1998) remend the use of the effective moment of inertia, Ie, to calculate the deflection of cracked steel reinforced concrete members. The procedure entails the calculation of a uniform moment of inertia throughout the beam length, and use of deflection equations derived from linear elastic analysis. The effective moment of inertia, Ie, is based on semiempirical considerations, and despite some doubt about its applicability to conventional reinforced concrete members subjected to plex loading and boundary conditions, it has yielded satisfactory results in most practical applications over the years. In North American codes, deflection calculation of flexural members are mainly based on equations derived from linear elastic analysis, using the effective moment of inertia, Ie, given by Branson’s formula (1965) （1）=cracking moment。 Brown and Bartholomew 1996。 α=bond dependent coefficient（until more data bee available, α=）。ASCE, ISSN 10900268/2006/3183–194.FRPRC構(gòu)件的撓度計(jì)算公式的評(píng)論。這些構(gòu)件與芳綸玻璃鋼鋼筋、玻璃玻璃鋼或碳纖維塑料筋配筋率、幾何和材料屬性不同。關(guān)鍵詞: 鋼筋混凝土,纖維增強(qiáng)聚合物。統(tǒng)計(jì)數(shù)據(jù)。這導(dǎo)致開(kāi)裂后大量減少FRP加固的梁的剛度。本文只討論瞬時(shí)撓度。 在北美的規(guī)范中,構(gòu)件的撓度計(jì)算公式主要是由線性彈性分析所得的方程,即使用由1965年的布蘭森公式所得的有效慣性矩， (1)=開(kāi)裂彎矩。如果使用FRP加固構(gòu)件，此時(shí)有效慣性矩可由方程（2）所得 (2) 研究人員做了進(jìn)一步的研究,以便于確定一個(gè)類(lèi)似于方程式（1）但更快捷的有效慣性矩方程。修改后的方程如下: (3)Toutanji 和薩菲（2000） 對(duì)有效慣性矩進(jìn)行了進(jìn)一步的研究。=鋼筋的彈性模量。 根據(jù)ACI (ACI 2003),FRPRC的慣性矩方程取決于FRP的彈性模量和由計(jì)算的FRP加固梁的撓度方程，可由如下方程式得: (7)
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