Study On Mechanism And Parameter Optimization Of Wedge Anchorage

In recent years, mountains, valleys, bays and rivers have become a major obstacle to the further development of States’traffic, long-span suspension bridge is recognized as the most efficient, economical and safe solution. Anchor system is the most vital supporting memb of suspension bridge. Because of having no special geological and topographical limitations, gravity anchorage is the most widely used, however, the amount of soil excavation and concrete demand is very huge,which cost are very high.While,wedge anchorage has a great advantage over gravity anchorage,but it’s apparently rare for theory research on wedge anchorage. Therefor, it is essential for us to study on mechanism and parameter optimization of wedge anchorage thoroughly and comprehensively.This paper takes innitial design of Shunxi river super-large bridge’gravity anchorage as background information,takes the stability theory of gravity anchorage as the basis, takes correlation theory for Abaqus as the basis of numerical simulation. First of all, this paper comparatively analyzes gravity anchorage and wedge anchorage. Second, it has a research on parameter optimization of structural style and stability. An ideal structural style will be recommended through the comprehensive evaluation. The product and conclusion are made as follow:1. The calculation of gravity anchorage shows the conclusions as follow:Mises stress of anchorage is increasing from top to bottom, the maximum values are in the four corners of the bottom of the anchorage; The mises stress of anchor foundation pit is increasing toward the basal direction, the maximum values are in the four corners of the bottom of the foundation pit; Along the direction of tension the anchor has a horizontal displacement, the maximum values of anchor foundation pit are at the upper end of the front wall; The gravity anchorage can be regarded as a rigid body,the whole anchor has a rigid body rotation with the front end sinking and the back end uplifting.2. The calculation of wedge anchorage shows the conclusions as follow:Mises stress of anchorage is increasing from top to bottom, the maximum values are in the four corners of the bottom of the anchorage; The mises stress of anchor foundation pit is increasing toward the basal direction, the maximum values are in the four corners of the bottom of the foundation pit; Along the direction of tension the anchor has a horizontal displacement, the maximum values of anchor foundation pit are at the upper end of the back wall; The wedge anchorage can be regarded as a rigid body,the whole anchor has a rigid body rotation with the front end sinking and the back end uplifting.3. Compared with thegravity anchorage, the cost of the wedge anchorage is greatly reduced under the premise of guaranteeing the safety.4. Do the parameter optimization analysis for wedge anchor from the form of the side wall,the calculation shows the conclusions as follow:When the second layer wedge adopts straight wall or inclined wall operating condition will achieve optimal with the straight wall.5. Do the parameter optimization analysis for wedge anchor from the horizontal wedge angle,the calculation shows the conclusions as follow:when the horizontal wedge angle of the anchorage is 82.82°,84.86°,86.91°,90°,operating condition will achieve optimal with the angle parameter being 82.82°6. Do the parameter optimization analysis for wedge anchor from the length combination of the bottom wedge and the second layer wedge, the calculation shows the conclusions as follow:When the length combination of the bottom wedge and the second layer wedge are 15m+21.5m,20m+23m,24.8m+27.8m, operating condition will achieve optimal with the length combinationthe being 15m+21.5m.