Inspection Mechanism and Experimental Study of Prestressed Reverse Tension Method under PC Beam Bridge Anchorage

3rd International Conference on Energy Equipment Science and Engineering

Peng, Zhang^1

China Merchants Chongqing Communications Technology Research and Design Institute Co., Ltd., Chonqing

400067, China^1

关键词: Bridge constructions;    Elastic compression;    Influential factors;    Mechanical effects;    Mechanism analysis;    Model experiments;    Prestressing tendon;    Security and performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/128/1/012016/pdf
DOI  :  10.1088/1755-1315/128/1/012016

来源: IOP

【 摘 要 】

the prestress under anchorage is directly related to the structural security and performance of PC beam bridge. The reverse tension method is a kind of inspection which confirms the prestress by exerting reversed tension load on the exposed prestressing tendon of beam bridge anchoring system. The thesis elaborately expounds the inspection mechanism and mechanical effect of reverse tension method, theoretically analyzes the influential elements of inspection like tool anchorage deformation, compression of conjuncture, device glide, friction of anchorage loop mouth and elastic compression of concrete, and then presents the following formula to calculate prestress under anchorage. On the basis of model experiment, the thesis systematically studies some key issues during the reverse tension process of PC beam bridge anchorage system like the formation of stress-elongation curve, influential factors, judgment method of prestress under anchorage, variation trend and compensation scale, verifies the accuracy of mechanism analysis and demonstrates: the prestress under anchorage is less than or equal to 75% of the ultimate strength of prestressing tendon, the error of inspect result is less than 1%, which can meet with the demands of construction. The research result has provided theoretical basis and technical foundation for the promotion and application of reverse tension in bridge construction.