Local Analysis Under The Cable Anchorage Of Tower Wall For The Cable-Stayed Bridge

The anchorage zone of the pylon is a key part for cable-stayed bridges,where the local concentrated force of cable will be transferred to the pylon safely and uniformly.Because of the powerful local concentrated forces,anchoring forces from prestressed steels and weaken factors from opening holes,the strength state at this area is very complicated. Therefore,analysis of strength performance at the anchorage zone of cable-stayed bridge tower has been attracted attention in bridge engineering all the time and anchorage zone of tower is also the difficult and important part in designing and constructing of cable-stayed bridge.Based on Song Huajing River Bridge at Sifangtai,clear numerical analysis and reliable full-scale model test for the anchorage zone segment on the tower were carried out.However the single axial symmetry similar hexagon section of main tower for Song Huajing River Bridge at Sifangtai was used in China for the first time,and the strength state was so more complicated that simple theory could not analyze the real stress distribution at the anchorage zone.Therefore, full-scale model test of the anchorage zone segment on the cable bent tower was done.According to the result of the test,we can gain the stress under the anchor.Utilized ANSYS to analyze the anchorage zone on the cable bent tower and investigate stress distribution at the area.The analysis results by FEA indicated that the horizontal direction stress compared with the vertical direction stress was important.Before the cracking load of the tower that is 14500KN,under all kinds of load,the stress got by the test corresponded with the results got by FEA.So the theory analysis had been proved correctly.