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随着各类桩基础在铁路桥梁中的广泛应用,桥墩桩基的抗震计算已成为设计中经常遇到的课题。现行《铁路工程抗震设计规范》(以下简称《抗震规范》)中为桩基的抗震计算提供了一个简化计算方法。这个方法的基本出发点是认为桩基础以弯曲变形为主,且一般桩基桥墩高度不大,因此进一步认为振动时第一振型分量占主要成分,而略去高振型分量不计。并将第一振型曲线简化为三角形,用代替质量法将墩身各部分重量换算到墩顶,简化成单质点体系,以近似计算第一
With the wide application of various types of pile foundations in railway bridges, the seismic calculation of pile foundations has become a frequently encountered issue in design. The current “code for seismic design of railway engineering” (hereinafter referred to as “seismic code”) provides a simplified method for seismic calculation of pile foundation. The basic starting point of this method is that the pile foundation is mainly bent and deformed, and the pile height of the pile foundation is not large. Therefore, it is further considered that the first vibration mode component accounts for the main component while the high vibration mode component is omitted. And the first mode-shaped curve is simplified to triangle, with the replacement of the mass method to the pier body weight conversion to the pier top, reduced to a single particle system to approximate the first