The paper applies nonlinear dynamic analysis to estimate seismic performances of reinforced concrete girder bridges. In all analysed variations, the structure of the beam implies the continual girder with four fields (35 m + 50 m + 50 m + 35 m) hinged to the pier tops and the abutments. The piers are completely fixed to the ground with the lengths of 7 m, 14 m and 21 m; hence, 18 diverse combinations of pier lengths have been analysed. Geometric nonlinearity is included via the P–Δ effect, while the material nonlinearity is included into the analyses using the fibre models of plastic hinges. The estimation of seismic performances has been calculated on the basis of the demanded local ductility and the local ductile capacity of the critical cross-sections in the piers of all bridge analysed variations. Artificially (synthetically) generated and recorded earthquake accelerograms have been utilized for nonlinear dynamic analyses.
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机译：本文应用非线性动力分析来评估钢筋混凝土箱梁桥的抗震性能。在所有分析的变型中，梁的结构暗示了连续梁，其中四个场（35 m + 50 m + 50 m + 35 m）铰接至墩顶和桥台。墩完全固定在地面上，长度分别为7 m，14 m和21 m。因此，已经分析了18种不同的墩长组合。通过P–Δ效应包括几何非线性，而使用塑料铰链的纤维模型将材料非线性纳入分析。抗震性能的评估是根据所要求的局部延性和所有分析过的桥墩的临界截面的局部延性计算的。人工（合成）生成和记录的地震加速度图已用于非线性动力分析。
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