基于桥梁系数的非线性静力分析方法评估

Evaluation of Nonlinear Static Analysis Method Based on Bridge Coefficient

以桥梁系数作为参照标准,分别采用真实地震波反应谱和设计反应谱作为地震需求,对比分析了4种非线性静力方法(承载力反应谱法、N2法、改进的模态Pushover分析法和自适应承载力反应谱法)对钢筋混凝土连续桥梁结构的计算准确性。研究表明:随着地震强度的增大,4种非线性静力分析方法得到的计算结果逐渐接近于非线性动力分析的计算结果;对于采用真实地震波的情况,N2法给出了最接近动力分析的结果,而对于采用设计反应谱的情况,4种非线性静力分析方法得到的结果之间差别非常小。

Taking the bridge coefficients as the reference standards,the real seismic wave response spectrum and the design response spectrum are used as the seismic demand respectively to analyze the calculation accuracies of reinforced concrete continuous girder bridge by four nonlinear static methods(bearing capacity response spectrum method,N2 method,modified modal Pushover analysis method and self-adaption bearing capacity response spectrum method).The study result shows that the calculation results obtained by four nonlinear static analysis methods are gradually close to the calculation results of nonlinear dynamic analysis with the increase of seismic intensity.N2 method gives the results of the closest dynamic analysis in the case of the real seismic waves.And the difference between the results of four nonlinear static analysis methods is very small in the case of the design response spectrum.