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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.

In engineering structures, it is a new approach to evaluate the structural health situation by use of optic fiber sensor. In this paper, a standard specimen beam, 200mm×300mm×3000mm, is chosen and the comparative experiment is executed for strain testing by FBG sensors and vibrating wire sensors which were widely used in bridge health monitoring. Experimental results show that the FBG sensors have a higher measurement precision, higher linearity and better noise resistance. Then we use traditional electrical resistance strain gage to calibrate the FBG sensors and obtain the strain degree of sensitivity, and apply them into bridge strengthening in the Wuhuang Highway in order to collect the strains of reinforcement bar in the deck pavement and the beams before and after the bridge strengthening. The above work is also to evaluate the effects of strengthening projects and carry out long-term structural health monitoring. The monitoring results show that the safety condition can be monitored conveniently with the FBG sensors testing system whose durability and stability can satisfy the need of bridge health monitoring. Finally, we also discuss the key problems and practical approaches in structural health monitoring process by use of embedded FBG sensors.

Take a High-rise Residential Building in Wuhan as research object, in assigns the construction plan under the premise, the optical mathematics model of the shear wall is established. Based on research of structure dynamic characteristics, displacement, mechanic character, structure measure, uses the criterion method and the exhaustion method, design principle of board high-rise residential building is conducted from the optical of shear wall arrangement，furthermore, site condition and seismic precaution intensity influence to the optical structure is analyzed.