| In china, the main design index of road bridges has been developed for 48 years. In now time, the actual traffic volume and heavy traffic that act on the bridges increase very rapidly, and the phenomenon of over loading and limit became more serious. So the maintenance and repair of service bridge to increase its load capacity, and furthermore, to insure the basic function of transportation is still the important problem to be faced in the next few times. With the development of road and transportation, the requirement of safe, quick, comfortable and low cost for travel is higher. To better help the development of national economic construction, in one way, the construction of road, bridge and railway should be increased; on the other hand, long timely monitoring of service behavior of Service Bridge is needed. And if necessary, maintenance and repair should be carried on the service bridges that have defect to increase their service lifetime and reliability. So, deep system theory analysis and experiment of this research project is very important and will greatly help the development of national road construction.Through practical investigation and theory analysis, different factors that affect the reliability of service pre-stressed concrete bridges are analysis in three different stages, design, construction and service stage, and relevant suggestion is given. The idea of structural "Health Care" is emphasized, that is, monitoring, diagnosis and protection, and relevant evaluation standard are given.1. The Main Contents Of ResearchDue to the problems existed in design, construction and service stage, the structural health degree of pre-stressed concrete bridge will decrease, and the requirement for normal use in the residual service lifetime cannot be fulfilled. So, it is necessary to research on the health problem of pre-stressed concrete bridge. Based on the current service situation of the structure, the comprehensive evaluation of structural working behavior is carried to decide its health condition and degree, and relevant maintenance strategy based on the health evaluation result is decided to guide the design of new structure and to insure the safety of service structure.Based on discussion of health of mankind, the health of bridge is drawn forth. By introducing of structural reliability analysis theory, different factors that in design, construction and service stage were analyzed, rational advice and relevant technology standard are suggested. And based on these research, the research monitoring and diagnosis methods of new material, construction technology and structures is carried out, to gain the method of health restoration of bridges, that is, specific measures and relevant standard to assure the durability of the structures.The main works are summarized as follows:1) The development and application of the pre-stressed technology in the bridge structures are reviewed; the implementation of the reliability theory and the assessment, maintenance strategy is stated.2) Assemble to the sub-health research of mankind, the ideas of bridge sub-health are provided. The health research methods are suggested after discussing theoretical factors, the influence of the three main stages 梔esign, construction and maintenance to the structures is analyzed.3) According to the relevant information, expert experience, assessment standard and data, the method of two grade comprehensive fuzzy comprehensive evaluation and standard is suggested.4) According to the relevant standard and code, the content of health monitoring is reviewed; the health restoration strategy of the pre-stressed concrete bridge structures is concluded.5) Based on the theory of the paper, combined with the health monitoring report, the influence of the bridge health is analyzed, the restoring strategy is provided.6) The chief works are summarized and the problems that need to study are provided.2. ConclusionAimed at the actual problems existed in design, construction and service stage t... |
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