Abstract
Base on a long-span cable-stayed bridge with twin towers. According to the design data and the load test, FEM is established and modified to meet the actual structure. By using the theory of FEA and calculation of the design load and structural mechanics performance, “Theoretical spectra” of static characteristics of structures are established. On the basis of load test, the most unfavorable section and vulnerable parts of the bridge are obtained. Then “Standard spectrum” of bridge structure under the action of standard design load is established. Combining theoretical analysis with the sensor layout method commonly used in long-span cable-stayed bridges, the sensor layout scheme is finally obtained according to the “theoretical spectrum”, the “standard spectrum” and the sensor optimization arrangement theory. The sensor placement method presented in this paper is feasible and effective, and provides a scientific theoretical basis for the sensor placement scheme. It can be used as a real-time monitoring sensor placement method for similar bridges.
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