Analysis Of Local Stress In Anchorage Zone Of Cable Stayed Bridge

Anchorage zone of cable-stayed bridge pylon is an important part of the cable giant concentrated force transmitted to the towers,to bear the enormous force,concrete pylon wall box layout of prestressed tendons need level.For the anchorage zone of cable tower,the stress on this part is very complicated because of the weakening of the cable hole and the prestress of the prestressing tendon.At present,there are no ready-made codes for the anchorage zone of cable tower to guide the design.This stage will do research on local analysis by computer finite element software for the anchorage zone of cable-stayed bridge,to understand the actual working state of the anchorage zone under the spatial stress distribution,so as to provide the basis for the bridge design and construction.Therefore,the stress analysis of the anchorage zone of cable stayed bridge has always been the focus of the bridge research.That paper takes Tianshui Xihe Bridge as the support of the project.The research has the following necessity: the establishment of finite element software ANSYS analysis model of the anchorage zone of the bridge tower and found the original design of prestressed tendon layout is not reasonable;the bridge pylon Anchorage Zone on both sides of the anchoring tooth block is non symmetrical design,worth the stress distribution analysis;the earthquake effect on anchorage zone of cable-stayed bridge analysis research.On the basis of actual theory and finite element analysis technique,the following research contents of pylon anchorage zone of river bridge are studied in this paper:(1)Theoretical analysis of stress loss of prestressed tendon in prestressed concrete structure,and understand the principle of prestress loss.The failure mechanism of anchorage zone of prestressed concrete structure is analyzed,which provides reference value for local reinforcement of anchorage zone.(2)The establishment of the anchorage zone of finite element model,analysis of prestressed anchorage reinforcement # font layout and U type layout,the layout for the anchorage zone of prestressed reinforcement of the bridge and verify the rationality.(3)The stress variation in Anchorage Zone of pylon is analyzed and the safety performance of pylon anchorage zone is verified under the action of prestressing force,cable force and normal operation.(4)The stress distribution in anchorage zone is analyzed after applying seismic force to anchorage zone of cable tower,and the stress variation of anchorage zone in the previous three conditions is compared and analyzed.(5)The most unfavorable cable pylon cable hole interception level,the characteristic points and analyze the changes of the tower wall inside and outside edge in four under the conditions of stress,understand the tower lateral and medial edge in the longitudinal and transverse stress distribution.