Abstract
The hinged slab bridge is widely used in medium- and small-span bridges because of its simple structure and convenient construction. However, hinge joints damage is the main defect of this kind of bridge, and it is difficult to express the deterministic damage degree of hinge joints in the detection process. A system reliability evaluation method considering fuzzy detection information of hinge joints damage and member failure credibility is proposed in this paper. Firstly, the membership function is used to quantitatively express the fuzzy detection information of hinge joints, and the fuzzy variable is transformed to an equivalent random variable. Secondly, the functional relationship between the transverse distribution coefficient and hinge joints damage is constructed by the modified hinge-jointed plate method and response surface method, and the reliability of the member considering the fuzzy detection information of hinge joints damage is calculated by the first-order second-moment method (FOSM). Then, the failure credibility is introduced to represent the different possibilities of system failure caused by member failure, and a system reliability assessment method of different failure criteria considering member failure credibility is established based on copula theory. Finally, the applicability of the proposed method is verified by taking the reinforced concrete hinged slab bridge as a numerical example.
Highlights
As the key node of road networks, bridge safety operation is very important to the normal operation of the transportation system
Step 3: The function relation between the transverse distribution coefficient and the damage degree of each hinge joint is constructed by using the response surface method according to the calculated sample point data, the selected response surface function is described in Equation (9), and the transverse distribution coefficient mi of each main beam considering the fuzzy detection information of the damage degree of hinge joints is obtained by using least-squares method
In the reliability evaluation of the system under different failure criteria, the failure probability of the system corresponding to different membership functions is basically consistent when the limit range of the hinge joint damage degree interval is minimum, and the failure probability gradually increases with the damage degree interval range
Summary
As the key node of road networks, bridge safety operation is very important to the normal operation of the transportation system. As Copula functions can capture the nonlinear correlation between failure modes, and construct multiple joint distribution functions, which can calculate the joint failure probability of multiple members, they are introduced in the reliability assessment of structural systems. How to effectively deal with the fuzzy information of the hinge joint damage degree and consider the different contributions of member failure to structural system failure are very important for the reliability evaluation of existing hinged slab bridge systems. In view of the above problems, this paper originally proposes a novel method to evaluate the reliability of hinged slab beam bridges considering the fuzzy detection information of hinge joints damage and the failure credibility of members.
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