Bridge health monitoring, maintenance and safety : special by Yang Liu

By Yang Liu

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By Yang Liu

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Key Engineering Materials Vol. 1 Traffic load simulation Traffic load across bridge is a random process, process and the vehicle type, weight and spacing at any time follows a certain random distribution [10]. Inn the paper, based on the need and characteristic of cable fatigue damage probabilistic robabilistic analysis, analysis the simulation imulation research of random traffic load is carried out by taking the Nanjing Yangtse River second bridge as studying object. Firstly, irstly, the average daily traffic volume and its annual growth rate of the bridge could be obtained by the traffic volume survey and investigations.

Chan. Bridge live load models from WIM data[J]. Engineering Structures. (24), 1071-1084. (2002) [11] LI Yan. Wind –vehicle-bridge dynamic response and fatigue reliability of cables of long span cable-stayed bridges. Harbin, China. Harbin institute of university. (2008). [12] Transportation Department of the People Republic of China. Resistance wind design specification of highway. The people transport publishing house. (2004) [13] H. F. Xiang. Wind resistance theory and practice of model bridge.

The he performance of the three algorithms is quantified quantifi by the two indices, Ropt for the robustness and Topt for the efficiency of the algorithms. The indices are defined by Eqs. (14) and (15) respectively. Ropt ( %) = NUM opt NUM ite ×100 (14) where NUM opt is the number of runs attaining the global optimum, and NUM ite = 100 is the total number of runs, and Topt 1 = NUM opt NUM opt ∑ Timei (15) i =1 where Timei is computation time for the ith successful implementation. Key Engineering Materials Vol.

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