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根据挡块的简化滞回分析模型,针对不等墩高连续梁桥,通过IDA分析对2种典型的简化抗震分析方法(一是忽略挡块、二是横向固结)进行对比研究。结果表明:不同分析方法得到的横向剪力分布规律基本相同,墩高越大,剪力响应越小,但不同方法得到的最高墩与最矮墩的剪力可能相差数倍;不管采用哪种方法,各墩横向剪力的分布随PGA的增大都会变得更不均衡;在抗震分析时,应根据挡块强度及地震的大小选择相应的简化方法。当挡块强度较大且地震较小(PGA≤0.3 g)时,2种简化方法都不能准确反映矮墩的剪力需求及其塑性程度,此时应在分析中考虑挡块自身的力学性能。
According to the simplified hysteresis analysis model of the stopper, two typical simplified seismic analysis methods (one is ignoring the stopper and the other is transverse consolidation) are studied by IDA analysis for continuous girder bridge with unequal pier. The results show that the laws of transverse shear distribution obtained by different methods are basically the same. The larger the pier height is, the smaller the shear response is. However, the shear forces of the highest piers and the shortest piers obtained by different methods may differ by several times; Method, the distribution of transverse shear of each piers will become more unbalanced with the increase of PGA. In the analysis of anti-seismic analysis, a corresponding simplified method should be selected according to the strength of the stopper and the magnitude of the earthquake. When the block strength is large and the earthquake is small (PGA≤0.3 g), the two simplified methods can not accurately reflect the shear demand and the plasticity of the short pier. In this case, the mechanical properties of the block should be considered .