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劉立新1，趙靜超1，王俊1,2
(1 鄭州大學土木工程學院，鄭州450002; 2 許昌學院，許昌461000)[摘要] 通過觀測3根配500MPa鋼筋折線先張預(yù)應(yīng)力混凝土簡支梁在長期荷載作用下的跨中撓度，對徐變撓度、徐變撓度系數(shù)等時隨特征參數(shù)進行分析，得出了該類梁在不同工作環(huán)境下徐變系數(shù)的時程關(guān)系表達式。并用常用的徐變計算模式(ACI209R-92. CEB-FIP MC90及GL2000)及本文擬合公式對本試驗的計算結(jié)果進行了對比分析，對該類梁在設(shè)計時徐變系數(shù)的選取及預(yù)拱度的設(shè)置有較高的參考價值。
[關(guān)鍵詞] 折線先張預(yù)應(yīng)力梁；撓度；徐變撓度系數(shù)；徐變終值Experimental study on creep deformation of fold-line pre-tension pre-stressed simple supported beam
Liu Lixin1, Zhao Jingchao1, Wang Jun1,2
(1 School of Civil Engineering, Zhengzhou University, Zhengzhou 450002, Henan, China; 2 Xuchang University, Xuchang 461000, Henan, China)Abstract: Based on the deflection observed data of three fold-line pre-tension pre-stressed simple supported beams under long-term loads with 500MPa high strength steel bars, characteristic parameter based on time such as creep deflection, creep deflection coefiicient is analyzed, and the formulas of creep deflection coefficient for the beam of this type in different working environment are suggested. The commonly used computing model creep (ACI209R-92, CEB-FIP MC90 and GL2000) and the result calculated by the formulas are contrasted and analyzed, and this may be have high reference value for the creep coefficient selection and pre-camber settings of the beam ofthis type.
Keywords: fold-line pre-tensioned pre-stressed beam; deflection; creep deflection coefficient; creep terminal value
