常规等宽高架桥的抗震计算分析与验算

文章以市政高架桥中常用的三联等宽标准段箱梁桥为例,对比了反应谱分析、线性时程分析和非线性时程分析三种方法的计算结果,验算了桥墩墩柱及桥墩系梁,结果表明:地震波沿纵桥向输入时,反应谱计算结果和线性时程计算结果较为接近,最大误差在20%以内;非线性计算结果远小于另外两种方法;地震波沿横桥向输入时,三种方法的计算结果较为接近;固定墩作为承担地震力的主要构件,在设计的时候可以适当地加大固定墩的墩柱尺寸及对应的支座竖向承载能力要求;地震动沿横桥向输入时,桥墩系梁为抗震不利段,抗震计算时需重点考虑。

In this paper, with the example of standard box girder bridge with equal width commonly used in municipal viaduct,the calculation results of response spectrum analysis, linear time-history analysis and nonlinear time-history analysis are compared,and the bridge piers and pier girders are checked and calculated. The results show that when the seismic wave is input along thelongitudinal bridge, the result of response spectrum calculation is close to that of the linear time history calculation, the maximum error is less than 20%, the nonlinear calculation result is much smaller than by the other two methods, and the seismic wave is inputalong the transverse bridge direction. The calculation results of the three methods are close; the fixed pier, as the main componentbearing the seismic force, can appropriately increase the size of the pier and the corresponding vertical bearing capacity requirementsin the design of the fixed pier; when the ground motion is input along the transverse bridge, the vertical bearing capacity of thefixed pier can be appropriately increased when the ground motion is input along the transverse bridge. The bridge piers and girdersare the unfavorable seismic section, which should be taken into account in seismic calculation.