水平地震激励下大跨度拱桥行波反应分析

Traveling response analysis of long-span arch bridge under horizontal seismic excitation

以某大跨公路拱桥为例,通过数值计算,讨论水平地震激励下拱桥行波反应的特点和行波波速的影响。利用拱桥结构的对称性特点,提出了叠加正、反对称半拱桥一致地震反应模拟全拱桥行波地震反应的简化计算方法,数值计算结果验证了这一计算方法具有较高的计算精度,可推广应用于较为复杂的拱桥多点输入地震反应计算问题,便于工程技术人员应用。

Taking a long-span arch bridge as the example, the characteristics of traveling responses of the arch bridge under the horizontal seismic excitation and the influence of the traveling velocity are discussed on the basis of numerical analysis results. According to the structure symmetry, a simplification computational method is proposed for the traveling seismic response analysis of the arch bridge by using the seismic response of two half arch bridges under the consistent excitation in time domain. The time history analysis results indicate that the simplification model can achieve a high precision. This method can be extended to the complex problem of the seismic response of the arch bridge under multiple-support excitation for the engineering technologist applying.