钢筋混凝土双曲拱桥计算模型修正方法

分别用实体单元和梁杆单元建立双曲拱桥有限元模型(FEM),对其进行静动力的分析,并将得到的挠度、固有频率、振型等与现场实测结果进行比较.结果表明:梁杆单元模型的计算结果精度要略差于实体单元模型,但计算效率大大高于实体单元模型;对梁杆单元模型进行合理的模型修正,可以使其静动力特性更加符合实际,计算结果与实测结果的误差由原先的24.6%降低至8.33%以内.研究结果可为钢筋混凝土双曲拱桥的建模方法、模型修正和科学计算提供依据.

Modification Method of Calculation Model of Reinforced Concrete Double Curved Arch Bridge

The finite element models(FEM)of the double curved arch bridge were established using solid elements and beam elements respectively, the static and dynamic analysis of the two finite element models(FEM)was carried out. Comparing the deflection results, the natural frequency and vibration mode results of the FEM models with the field measured results, it is shown that: the accuracy of the beam element model is slightly lower than that of the solid element model, but the calculation efficiency is much higher than that of the solid element model. The reasonable model modification of the beam element model can make its static and dynamic characteristics conform more with the actual situation, and the error between the calculation results and the measured results is reduced from 24.6% to 8.33%, which basically meets the engineering accuracy requirements. The research results can provide the basis for the model modification and scientific calculation of reinforced concrete double curved arch bridge.