非均布压力作用下纯弯曲孔道预应力摩阻损失  

Prestress Friction Loss in Purely Bent Orifices Considering the Effect of Non-uniform Pressure

作　　者：杨雅勋[1] 刘寒 柴文浩 吴富勇 叶家乐 YANG Ya-xun;LIU Han;CHAI Wen-hao;WU Fu-yong;YE Jia-le(School of Highway,Chang an University,Xi an 710064,China)

机构地区：[1]长安大学公路学院,西安710064

出　　处：《科学技术与工程》2024年第12期5170-5178,共9页Science Technology and Engineering

基　　金：国家自然科学基金(52178104);长安大学中央高校基本科研业务费专项(300102212905)。

摘　　要：为获得更准确的孔道预应力摩阻损失计算方法,保证桥梁结构设计的有效预应力和桥梁结构的安全运行。根据赫兹接触理论,综合考虑摩擦力、接触压力与张拉力间的相互作用,导出了纯弯曲孔道在非均匀压力作用下摩阻损失公式。通过有限元软件分析不同参数对摩阻损失计算值的影响。通过实际工程的摩阻试验探究纯弯曲孔道在非均匀压力下预应力摩阻损失的具体分布规律,并通过规范公式、推导公式的理论计算值与现场实测数据的偏差,验证公式的合理性。结果表明:弯曲角度小于120°、摩擦系数为0.2~0.4范围内,推导公式计算值更接近实际情况;随着张拉应力和弯曲角度的增加,利用推导公式计算得到的摩阻损失值更接近实测结果。In order to obtain a more accurate calculation method for the prestress frictional loss of the duct,and to ensure the effective prestress of the bridge structure design and the safe operation of the bridge structure,based on the Hertz contact theory and the coupling effect between friction force,contact pressure,and tensile force were considered,the formula was derived for the frictional loss of the pure bending duct under non-uniform pressure.The influence of different parameters on the calculated value of the frictional loss was analyzed using finite element software.Exploring the specific distribution of the law of pure bending orifice in the non-uniform pressure prestressing resistance loss through the actual engineering resistance test,and through the specification of the formula,derivation of the formula of the theoretical calculated value and the field measured data of the deviation,to verify the reasonableness of the formula.The results show that for bending angles smaller than 120°and friction coefficients within the range of 0.2~0.4,the calculated values from the derived formula are closer to the actual situation.With the increase of tensile stress and bending angle,the calculated values of the frictional loss obtained from the derived formula are closer to the measured results.

关 键 词：预应力摩阻损失 弯曲孔道 有限元模拟 接触压力 

分 类 号：U446[建筑科学—桥梁与隧道工程]