Study on Load Test for Single-Tower Cable-Stayed Bridge with Double-Layered Steel Truss Girder
In order to accurately evaluate the working performance and load carrying capacity of the double-layered steel truss girder of single-tower cable-stayed bridge,a finite element model has been established with the Lianshiwan Bridge as the research object,and static and dynamic load tests have been conducted on the bridge structure,which include such parameters as main truss deflection,section strain,longitudinal horizontal displacement of the main tower,cable force increment of the cable-stayed bridge,structural modalities and impact coefficient,aiming to evaluate the structural state of the bridge.The test results have been compared with the theoretical analysis results,and the results have shown that the strain,deflection and displacement of each control section of the Lianshiwan Bridge meet the specification requirements,and the measured frequencies of each order of vibration of the bridge are greater than the theoretical frequencies,indicating that the overall stiffness of the structure meets the design requirements;the bridge is in a good state of stress,and the whole of the bridge is in an elastic working condition,meeting the normal working requirements of the design load.
double-layered steel trusssingle-tower cable-stayed bridgeload testfinite element model
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