基于二级横张法的PC桥梁高强钢丝有效张拉力测试.pdfVIP

科技导报2014，32（8） 基于二级横张法的基于二级横张法的PCPC桥梁高强钢丝桥梁高强钢丝 有效张拉力测试有效张拉力测试 1 1 2 1 侯炜 ，贺拴海 ，韩智强 ，栾娟 1. 长安大学公路学院，西安710064 2. 太原科技大学运输与物流工程学院，太原030024 摘要摘要 为了检测PC桥梁高强钢丝的有效张拉力值，采用自主研发的预应力钢索张力测试仪（LCZL-50），在WED系列电子万能 试验机上进行了试验测试研究。首先通过试验机将高强钢丝张拉到不同预应力值，应用二级横张原理对高强钢丝进行有效张拉 力测试，然后基于最小二乘法对试验测试数据进行分析处理，通过回归计算得出高强钢丝的有效张拉力。将该方法用于实桥测 试和计算，结果显示，ϕ5 mm高强钢丝在较小横张力作用下，横张力与横张位移成线性变化，且满足小变形条件，其有效张拉力 实测值与理论值的误差小于5%，表明该方法的测试精度满足实际工程需要，可为PC桥梁的维护、加固或改造提供技术依据。 关键词关键词 PC桥梁；高强钢丝；有效张拉力；二级横张法 中图分类号中图分类号 U446.1 文献标志码文献标志码 A doidoi 10.3981/j.issn.1000-7857.2014.08.007 Test of Effective Tension of High-strength Wire in PC Bridge BasedonTransverseTensioningMethod 1 1 2 1 HOUWei,HEChuanhai,HANZhiqiang,LUANJuan 1.SchoolofHighway,Chang’anUniversity,Xi’an710064,China 2.SchoolofTransportationandLogisticsEngineering,TaiyuanUniversityofScienceandTechnology,Taiyuan 030024,China AbstractAbstract Totesttheeffectivetensionofhigh-strengthsteelwireofPCbridge,experimentswerecarriedoutonaWEDelectronic universaltestingmachineusingatensionedtensiontester(LCZL-50)thatisdevelopedindependently.First,thehigh-strengthsteel wire was stretched to different tension values using a testing machine, then the effective tension of it was tested by transverse tensioning method, and the experimental data were analyzed based on the least squares method. The above method was used in practicalbridgetestandcalculation.TheresultsofcomparativeanalysisofthetheoreticalvalueandmeasuredvalueofPCbridge showthatwhenthe ϕ5mmhigh-strengthsteelwirewasunderrelativelysmalltransversetension,thevariationoftransversetension and transverse displacement had a linear relationship, and conditions of small deformation were satisfied. The error between the measured value and theoretical value was smaller than 5%, indicating the test precision of this method meets the demands for prac