采用竖向预应力钢筋时梁的抗剪承载力计算的探讨  

Discussion about the Calculation of Shear Capacity of Beam Using Vertical Prestressed Bars

作　　者：刘灿[1] 

机构地区：[1]华南理工大学土木与交通学院,广州510641

出　　处：《科学技术与工程》2010年第25期6322-6326,共5页Science Technology and Engineering

摘　　要：竖向预应力钢筋已在大跨度桥梁结构中广泛使用,对于采用竖向预应力钢筋时梁的抗剪承载力的计算,进行了试验研究,并与《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTGD62—2004)中相应公式的计算结果进行了比较。结果表明,规范公式基本可靠,但有待进一步完善。主要表现在:(1)规范计算公式未考虑采用竖向预应力钢筋时箍筋的抗剪能力;(2)规范计算公式未考虑竖向预应力筋工作机理与普通箍筋不同;(3)规范计算公式未表述不同竖向预应力筋设置方式的影响。最后,提出了采用竖向预应力钢筋时梁的抗剪承载力建议计算公式,与试验结果吻合较好。Vertical prestressed bars have been widely used in long span bridges.Experimental study about the calculation of shear capacity of beam using vertical prestressed bars has been done.Experimental results are compared with the corresponding formula in the ＂Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts＂ （JTG D62—2004）,the results show that the formula in the code is reliable,but needs to be improved,mainly in the following areas：（a）Formula in the code does not consider the shear capacity of stirrups when using vertical prestressed bars,（b） Formula in the code does not take into account that the working mechanism of vertical prestressed bars is different from ordinary stirrups,（c） Formula in the code does not express the influence of the different ways of setting vertical prestressed bars.At last,a formula to compute the shear capacity of beam using vertical prestressed bars is suggested,the accuracy of the proposed formula is verified by the experimental results.

关 键 词：竖向预应力筋 抗剪承载力 规范公式 

分 类 号：TU375.1[建筑科学—结构工程]