【正文】 必須注意的是只有在負載的情況下才能檢驗撓度。慣性矩公式延用公式（7）,但對降低系數(shù)β進行了修改，降低系數(shù)取決于彈性模量相對配筋率，見以下方程: （10）彎矩曲率法是進行結(jié)構(gòu)分析中計算撓度的首選。許多研究人員（Benmokrane等1996。介 紹：纖維復合材料鋼筋目前可用來代替容易受到侵蝕性腐蝕破壞的鋼筋混凝土結(jié)構(gòu)。 and =modulus of elasticity of the FRP reinforcement. Upon finding that the ACI
（ACI 2003） equation often underpredicted the service load deflection of FRP reinforced concrete members, several attempts have been made in order to modify Eq.（7）. For instance, Yost et al.
（2003） claimed that the accuracy of Eq.（7） primarily relied on the reinforcement ratio of the member. It was concluded that the formula could be of the same form, but that the bond dependent coefficient, α, had to be modified. A modification factor, α, was proposed in the following form: （9）where =balanced reinforcement ratio. The ACI 440 Committee
(ACI 2004) has also proposed revisions to the design equation in ACI
(ACI 2003). The moment of inertia equation has retained the same familiar form as that of Eq. (7) in these revisions. However, the form of the reduction coefficient, , to be used in place of Eq. (8) was modified. The new reduction coefficient has changed the key variable in the equation from the modulus of elasticity to the relative reinforcement ratio as shown in the following equation: （10）Moment–Curvature Approach The moment–curvature approach for deflection calculation is based on the first principles of structural analysis. When a moment–curvature diagram is known, the virtual work method can be used to calculate the deflection of structural members under any load as （11）where L=simply supported length of the section。 Sandee Alminar2。 =modulus of elasticity of FRP reinforcement。規(guī)范。=有效截面慣性矩 1996年Benmokrane 的研究表明,為了提高起始方程的性能，需要進一步修改方程（1）。 =FRP的彈性模量。表1給出了構(gòu)件的一些重要性質(zhì)的取值范圍。設(shè)計者可以根據(jù)自己的試驗結(jié)果的分析，選擇一個精確的公式。法薩和GangaRao （1992）對四點彎曲做出假想,在負荷點和部分破壞面作用下，構(gòu)件將被破壞。修改后的方程如下: (3)Toutanji 和薩菲（2000） 對有效慣性矩進行了進一步的研究。這導致開裂后大量減少FRP加固的梁的剛度。ASCE, ISSN 10900268/2006/3183–194.FRPRC構(gòu)件的撓度計算公式的評論。 Deflection。 and =effective moment of inertia. Research by Benmokrane et al.
(1996)suggested that in order to improve the performance of the original equation, Eq.(1) will need to be further modified. Constants to modify the equation were developed through a 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。分析表明,FRP的彈性模量和相對配筋率在公式的準確性中發(fā)揮重要作用。 有效慣性矩是基于半經(jīng)驗的考慮,雖然當它受到復雜的加載和邊界條件時，與傳統(tǒng)鋼筋混凝土構(gòu)件有適用性問題,但是它在大多數(shù)實際應用中取得了令人滿意的結(jié)果。通過用大量的梁來進行撓度試驗，這些梁是由不同類型的FRP材料制作的，大量試驗所得的，與方程式（6）所得的相同。由此,可推導出用于計算簡支FRP加固梁的撓度公式，并于2002年用于CSA S80602（CSA 2002）。然而,由于在這里只有考慮改變的著撓度,故應該保守的預測撓度。而法薩和GangaRao （1992）對梁的撓度實驗的預測十分準確。=FRP的彈性模量。 本文的目的是指出現(xiàn)有的撓度公式和論證所有的通用方程在計算FRPRC構(gòu)件有局限性。計算撓度的九種方法,包括被測試人員用于下一期擬議的ACI R03和CSA S80602和ISIS M0301中的新公式設(shè)計指南中的實驗197個梁和板的撓度進行測試的方法。 Serviceability。Statistics.Introd