基于桥梁荷载试验的山区大跨径拱桥横向刚度研究

基于桥梁荷载试验分析了山区大跨径单箱室截面拱桥横向刚度,并与理论研究进行对比分析。通过挠度横向对比分析得出,在正载及偏载作用下横向挠度未出现较大差值,且整体回复正常,主桥未出现扭转趋势,主拱圈测点泊松效应在合理范围,主拱圈前三阶实测频率大于理论频率且振型未出现横向弯曲,表明主拱圈横向刚度较好,结构实测整体刚度大于设计值,结构能满足实际需求。

Experimental Study of Rapid Evaluation Load-bearing Capacity of PC Beams

Based on the bridge load test,the transverse stiffness of long-span single box-room section arch bridge in mountainous area is analyzed and compared with the theoretical research.Through the comparative analysis of transverse deflection,it is concluded that the transverse deflection does not show a large difference under the action of positive and biased loads,and the overall return to normal,the main bridge does not show a torsional trend,the Poisson effect of the main arch ring measurement points is within a reasonable range,the first three measured frequencies of the main arch ring are larger than the theoretical frequencies,and the mode of vibration does not appear transverse bending.The results show that the lateral stiffness of the main arch ring is good,and the measured overall stiffness of the structure is greater than the design value,so the structure can meet the actual needs.