Projection Pursuit Model Based Evalution Of Bridge Durablity

The bridge is the throat to ensure the smooth flow of traffic lines, but a long time, since the beginning of the designing bridge thought by "the intensity of light durable", using the bridge during the lack of conservation, making a large number of existing concrete bridges in the use of period failure to appear aging due to the durability, and the resulting negative impact and economic losses has caused widespread concern in the industry sector. Therefore, It has become a hot topic of concern to repair and maintenance of concrete bridges, and the reinforcement of evaluation of the project . Through on the durability of concrete bridge structure, bridge projects not only benefit the durability of the new design, but also on in-service durability of concrete bridges reasonable assessment of bridge maintenance work to provide the correct approach. Therefore, both the durability of concrete bridge on the normal use of existing concrete bridges have practical significance, but also guidance to be built for durability design of concrete bridges has theoretical significance.This paper summarizes the current domestic and international research on the durability of the bridge based on the combination of engineering characteristics, the durability of existing concrete bridges like one step of evaluation methods, based on projection pursuit method proposed bridge durability evaluation model. Firstly this paper described the research background of the durability of concrete bridges,the significance and major research and common research methods;summarizes the durability of concrete bridges over the past decade progress, and from the material, environment, discusses the four levels of structure and components the durability of concrete bridge status; in the narrative of the durability of pretested concrete bridges based on the main factors, the durability of concrete bridges summarized the content and methods of detection to projection pursuit based on the theory, the establishment of search based on projection the durability of the bridge track method evaluation model; use of accelerating genetic algorithm model for solving the optimal projection direction; Finally, in service of a comprehensive evaluation of the durability of the bridge to verify the proposed evaluation method.