集中参数法是目前土木工程抗震计算中考虑桩土地震相互作用的实用方法。从有限元方法的角度来看，集中参数方法将地层半无限空间模型化为一个无几何尺度的抽象的力学单元，这里称其为宏单元，其计算模型的选用和参数确定直接影响计算结果的精度。针对不同的地震动输入和工程中各种常见的土层，基于考虑土体非线性的Boulanger宏单元， m法和Mindlin解等三种桩—土水平弹簧模型，进行了详尽的参数分析工作，旨在说明对桥梁地震反应影响很大的桩-土水平弹簧系数的取值问题。
Abstract
Concentration parameter method is a major solution in seismic analysis and design of bridges. From the finite element perspective, concentration parameter method considers the stratum semi-infinite space as a mechanical model without geometric dimensions, which is called macro-element in this paper. And the determination methods of the model, such as the interaction spring stiffness, the damping and the equivalent mass for the soil around the piles are crucial to the calculation precision. Having considered common types of soil in engineering and different input of seismic waves, the thesis makes a comparative study of the Boulanger model, the ‘m’ method and the Mindlin method (which is equivalent to linear spring) based on a large number of parameter analysis, aiming to explain the key point of parameter selection for horizontal soil-pile spring which has a strong influence on seismic response of bridge.
Key words
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Earthquake soil-pile interaction non-linear macro-element
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