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结合某客运专线双线整孔简支箱梁的孔道摩阻损失试验,介绍了预应力束摩阻损失的试验方法,利用最小二乘法对测试数据进行处理,得到了摩阻损失系数μ和κ的计算公式及其实测结果。结果表明曲线梁的κ值比直线梁的大,我国桥涵施工规范关于μ值的规定过于严格,预应力损失参数μ,κ值应在正式施加预应力之前由现场试验确定,以此作为预应力混凝土结构的设计和施工的参考依据。
Combined with the tunnel friction loss test of two-lane full-aperture simple-supported box girder in a passenger dedicated railway, the test method of friction loss of prestressed beam is introduced. The test data is processed by the least square method, and the friction loss coefficient μ and κ The calculation formula and its measured results. The results show that the value of curvilinear beam is larger than that of straight beam. The specification of μ value of bridge and culvert construction in our country is too strict. The parameter of prestress loss μ and κ should be determined by field test before the formal application of prestressing force. Concrete structure design and construction of the reference.