Experimental Research on Load Test of a Single-tower Large-span Ground Anchor Suspension Bridge
Taking a single-tower large-span ground anchor suspension bridge in mountainous areas of China as the engineering background,in order to better understand and evaluate the actual working state of bridge structure,load test is carried out.The strain and deflection of the control section under different working conditions were obtained through static load test.Combined with the modal parameters and dynamic response of the structure under dynamic load test,the measured values and calculated values were compared to evaluate the working state of the bridge.The results show that the deflection check coefficient of the bridge is 0.79～0.97,and the strain check coefficient is 0.5～0.944 under static load test,the structural stiffness meets the design requirements,and the structure is in the elastic working state,which has a certain safety reserve.Under dynamic load test,the ratio between the measured frequency and the theoretical frequency is 1.01～1.50,and the measured frequency is greater than the calculated value,the measured mode is basically consistent with the theoretical mode,and the overall stiffness of the structure is larger.Under barrier-free driving and braking tests at different speeds,the measured maximum dynamic strain is 107με,the measured maximum impact coefficient of bridge span is 0.048,the bridge deck is generally smooth,and the stiffness meets the specification requirements.
NETL
NSTL
万方数据
维普
