对水工建筑物设计反应谱的人工波合成

本文指出了进行水工建筑物的抗震设计和模型试验时 ,合成人工地震动的必要性。简单回顾了合成谱拟合人工地震动的各种方法 ;此外 ,详细介绍了时域法进行人工地震动谱拟合的基本公式 ,以及方法的特色与创新点。最后针对龙羊峡、溪落渡拱坝等实际工程 ,用时域法生成了与《水工建筑物抗震设计规范》规定的设计反应谱相拟合的人工地震动时程。文中分析了谱拟合的精度 。

In this paper, it is pointed out that the artificial ground motion generation is indispensable for the seismic design and dynamic model test of hydraulic structures. Different methods for the generation of artificial ground motions are briefly reviewed. Besides, the fundamental formulas of time domain method as well as the characteristic and innovation of the method are introduced in detail. Finally, in connection of the real projects of Long Yang Xia and Xi Lou Du arch dams, the artificial seismic time histories compatible with the design response spectra prescribed by the ‘Specifications for Seismic Design of Hydraulic Structures’ are generated by the time domain method. The accuracy of the generating spectra is analyzed, which shows the advantage of artificial ground motion generation by using the time domain method to produce the spectra.