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Implementing monitoring over construction process of old bridge’s reinforcement serves as an important measure to ensure construction quality and safety and realize the goal of reinforcement. This paper, with a case study of the maintenance and reinforcement project of Zhicheng Yangtze River Bridge (steel truss highway-railway combined bridge), adopted MIDAS to establish finite element analysis model, and with stress and deformation as monitoring parameters, completed the construction monitoring work, numerical simulation analysis and site test for the reinforcement project.

Cast steel node is a new type of structure joint developed with the application of large-span steel space structure. The stress distribution is discussed of cast steel nodes under three-dimension load by the use of FEM, in the space grid structure of maintenance hall. By the measurement, the stress on the surface of the cast steel node under design load is obtained. Combined with the test on-the-spot and computation, the result proves FEM result.

An improved maximum power point tracking method for wind-solar hybrid generation system was proposed in this paper. The maximum power point was tracked by Perturbation and Observation Algorithms and quadratic interpolation method. Taking the advantage of the above methods, the new method could avoid shock phenomenon of Perturbation and Observation Algorithms near the maximum power point, reduce miscarriage of justice. The whole system was simulated on MATLAB. The simulation results shown that, the improved control method could search the maximum power point of wind-solar hybrid generation system quickly, and work stably.