Research On The Theory And Method Of Reliability In Structural Engineering Construction System

In the paper the Theory and Method of reliability in Construction System is studied based on the main achievement of the domestic and foreign study about the fundamental of reliability, and the following results are mainly obtained:(1)According to the condition and characteristic of Structure Construction and the fundamentals of Systems Engineering and System Reliability, the conception of the reliability of Construction System is stated. Based on the characteristic of the construction and the fundamentals of Systems Engineering, the reliability of Construction System is referring to achieving the reliability of objective system during the construction process. The emphasis of studying the reliability of the construction is to seek after the reliability of how to ensure the lifetime decided in the design. According to the behavior function and the goal of production system, it is pointed out that ensuring the controlling of the quality of construction during the construction process of construction reliability is just the quality control target. Therefore, the conception of the construction reliability includes both connotation and extension of the structure reliability. Besides, it is different from the structure reliability because of the difference between design and construction.(2)The connection of the reliability of the process system is analyzed. The products of construction can be divided into five parts, such as construction projects, monomial projects, unit projects, subsection projects and subentry projects. The system reliability of unit projects, which the monomial projects are made of, mainly performs for the series relations. The system reliability of subentry projects, which the subsection projects are made of, mainly performs for the series-parallel relations. The paper analyzes the computation principle and method of the reliability of Process Subsystem, and develops the Pyramid model which is used to compute the reliability of Construction System.(3)It is pointed out that the methods of computing the reliability of Process system. The main methods include the followings: probability analytic method determined by the historical materials, method using theory probability distribution, subjective probability method, and improved method using subjective probability estimated value, and Monte Carlo method, and so on. The actual distribution function can be obtained by Monte Carlo method. (4)The non-probability methods are pointed out. According to the predecessor's exploration and main methods applied in the construction, the limitative method of"Normal state"is concluded. The method of the sensitive analysis is put forward according to the Process System Theory. Both methods are fit to determine the situations which is difficult to know the reliability probability and which is not necessary determine the reliability probability.(5) The reliability of Condition Subsystem during the Construction Process is decided. This Subsystem is divided into five subsystems, such as artificial subsystem, construction machinery equipment subsystem, and material subsystem, method of construction subsystem and environment of construction subsystem. Firstly, the parametric count analysis method and the calculating method of reliability, correct degree and availability of artificial subsystem are decided. Secondly, the reliability data structure and parameter are established and reliability calculation matrix which is used to analyze the construction machinery equipment system is built too. Thirdly, the Markov method is brought forward to calculate the reliability of the material subsystem. Fourthly, the strain- intensity intervening model is applied to handle the reliability of construction method. It has been proved to be valid by a demonstration. Finally, the fuzzy reliability is applied to analyze the reliability of environment of construction subsystem. The triangle Raised-Mountain-Shaped Function is taken as an example.(6) The main goals of quality, costs, progress and safety are considered comprehensively, and corresponding relational expression is built. According to the interrelation of the four goals, the calculating proceeding of reliability of goals and their cost relation is built. Then the cost validity analysis is carried out, and the controlling cost reliability model in construction organizing is set up. Finally, the Entropy Theory is applied to compute the reliability of goals system.(7) According to the reliability principle of complex network system, a proper algorithm model is established to calculate the minimal path set by adjacent matrix. And on this basis, the BDD Algorithm is improved in the paper based on the theory of disjoint, and a new way to calculate the reliability of complex network system is proposed. The reliability of complex network system of construction can be worked out effectively by programming according to the algorithm the paper provided.(8)The valuation standard of Construction System is set up in the paper. The valuation sectors, which applies fuzzy probability theory, are stated into 9 fuzzy language values, such as the most reliable, very reliable, reliable, more reliable, critical reliable, more unreliable, unreliable, very unreliable, and the most unreliable. And then these 9 sectors are turned into Fuzzy-Random Reliability Evaluation functions. Therefore, it obtains 9 fuzzy evaluation sectors, which is possible to provide the corresponding method and parameter for Construction System and each subsystem. And at last, the compound system coordination principle is pointed out.Finally, some Yangtze River highway bridges, which apply the system reliability theory and the method in Construction System, are taken as examples.