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AN EXPERIMENTAL STUDY ON PRESTRESSED TRANSIMISSION LENGTH FOR PRESTRESSED HELICAL RIBBED BAR
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摘要: 通过20个先张法构件预应力螺旋肋(HR)钢棒的预应力传递长度试验，详细分析钢棒有效预应力、混凝土抗拉强度、钢棒直径和配箍率等因素对预应力传递长度的影响，得出预应力HR钢棒相对预应力传递长度与钢棒有效预应力近似呈正比关系，与放张时混凝土抗拉强度近似呈反比关系；在试验数据的基础上，依据HR钢棒黏结锚固性能试验研究的结果，提出预应力HR钢棒的预应力传递长度计算公式。Abstract: The helical ribbed bar is named HR bar.By 20 prestressed transmission length tests of prestressed HR bar, the effect of the main factors(effective prestress of HR bar, concrete tensile strength, diameter of HR bar and stirrup ratio) on prestressed transmission length was analyzed in detail.The analyses showed that the relative prestressed transmission length was proportional to the HR bar effective prestress, and was inversely proportional to the concrete tensile strength.On the basis of the experimental data, and based on the results of bond-anchorage tests of HR bar, the formula of prestressed transmission length for HR bar was proposed.
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GB /T 5223.32005预应力混凝土用钢棒[S]. [2] 徐有邻,周氐.混凝土结构设计规范理解与应用[M].北京:中国建筑工业出版社,2002:55－64. [3] 徐有邻,谢铁桥.螺旋肋钢丝预应力传递性能的试验研究[J].混凝土与水泥制品,1998(1):31－35. [4] 蔡绍怀.先张法预应力筋自锚问题及其计算方法[J].建筑学报,1961(2):15－21. [5] GB 500102010混凝土结构设计规范[S]. [6] Eurocode 2: Design of Concrete Structures( BS EN 1992－1－1:2004( E))[S]. [7] Building Code Requirements for Structural Concrete ( ACI 318－08) and Commentary(2008)[S]. [8] 王宝朝.螺旋槽预应力钢棒的预应力传递长度与黏结锚固性能的试验研究[D].郑州:郑州大学,2012. -
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