Multi-tower Cable-stayed Bridge Stiffness Analysis

With the rapid development of society,Bridge-building technology is the rapid advances,there are more and more cross-sea bridge has been built.Multi-tower diagonal cable bridge been fond of for super long-span, beautiful appearance and economic cost.As the same time, multi-tower diagonal cable bridge's stiffness become a Prominent problem.Compare with common cable-stayed bridge,the biggest difference is there's no side cable anchoraging middle tower.It emerge big deviation under load.The middle cross also emerge big deflection.These made cable-stayed more and more flexible .So,the multi-tower diagonal cable bridge which has been built been used some ways to strengthen its overall stiffness.Analysis of the whole force status,we can kown its overall stiffness is made up by component stiffness , the whole bridge structure system and stiffening measures and so on. Each part can be a number of fronts to improve this part of the stiffness. Among them, the method which been offen used is to improve the component itself. In particular,the stiffness of tower and the use of strong demand to add stiffness to the entire intensive.The ways of stiffened faso setting includes setting the level of the top stiffening faso, setting an inter-cable-stayed, cross-setting of overlapping claims and lasso settings and so on.Based on the strong demand of each add mechanical analysis,but also through the establishment of model,stiffening of each program carried out quantitative analysis. More serious problem of the next Lasso program fatigue also been conducted a fatigue reliability analysis.