The Application Of Prestressed Concrete Bridge Effective Prestressed Testing Technology

In the days of great development of traffic construction, a mass of middling and smallspan prestressed concrete bridges were constructs.These existing prestressed concrete bridgespresented many potential safety troubles such as scratch and cracks after several years ofoperation.There are many reasons which can be summed up in the heavy loss ofprestressing.Prestresssd steel beam is the key force elements of the prestressed concretebridge structure,the prestress loss directly affects the bridge durability,structural strength andservice life.Detection on the effective prestressed steel beam,assessment and safety checkingof prestressed concrete bridges have important practical significane,so the article starts of thistopic.This article rely on hangzhou highway bureau research projects"prestressed concretebridge detection technology application research", application of wire rope tension tester forprestressed concrete Bridges under construction key effective prestressed steel beam, Throughreal bridge test for detecting effective prestress technology improved test methods, and putsforward improvement Suggestions for wire rope tension tester.Through the steel anchor beam,the installation of the pressure sensor is anchorage retraction value too large steel beamprestressed cable is less than the design value is one of the main factors. References the westtransportation construction projects of the country "medium and large span prestressedconcrete bridge detection technology" prestressed tendons along the the distribution ofresearch results to carry out the applied research，and through the effective real value oftesting and design of the comparative analysis to determine the losses and structural safety ofcurrent stage prestressed steel beam.Calculate steel beam stress along the boundary value involatility (0,10.0],combining steel beam effective prestressed frictional distribution rule anddistribution pattern to judge index delta steel beam bridge means obeying distributionpatterns.Simulate the distribution of the effective prestressed steel beam and calculate themain force of steel beam bridge,and prove the prediction of the effective prestressed steeibeam along the correctness of the distribution.State according to the design from the top tobottom edge of the main beam of concrete stress distribution has been sampled in accordancewith prestressed steel beam measured to calculate the current phase of the upper and loweredge of the main beam of concrete stress.With the growth of operating time,the upper edge ofthe main girder concrete compressive stress increases,the lower edge of the compressive stressdecreases,and the speed is slow down after.Effective prestressed steel beam decreases,thespeed has became slow gradually. The spatial model is used in this article,considering the comprehensive various factors tocheck of the safety.From the theoretical analysis results,crack may appear in the operation ofthis bridge after30years and suggestions on reserve pipeline in such places with externalprestressing tendons or adding prestressed tendons.