Harmony of the Contradiction between Multiplex Interests of Domination to Things and Principle of Real Right Legality——From the point of view of servitude legal system in the Roman Law;

Servitude s meaning in law is the right of using other people s thing for convenience and interests of special man or special land, which including easement and personal servitude.

Parameter identification of existing bridge structure based on improved Gauss-Newton algorithm;

Prediction of Markov fuzzy reliability for existing bridge;

With ageing of existing bridge,its condition becomes worse and worse.

Reliability forecasting method of existing beam-bridge bearing capacity is a researched aiming at the failure of main beam using time-dependent reliability research results,with deducing the rules of structure resistance time-dependent reliability.

Strategy of repair and reinforcement on existing bridges based on time-dependent reliability;

The issue of safety and economy should be considered in the repairing and strengthening of existing bridges.

The bridge design code in China is emended and the legal load level is improved according to the development of economy,which cause the existing bridges suffering a popular problem of traffic overloading.