Damage Controlled Seismic Design for Pile Foundation of Buildings

在日本，我们大约在30年前就开始研究土-桩-结构相互作用问题，但当时很少有结构工程师在设计支撑建筑结构的桩时考虑侧向力。在新泻地震(1964)、宫城县地震(1978)、仙谷地震(1995)等大地震中，许多桩损坏严重，震后许多桩上的建筑物倾斜。在过去的20年里，许多工程师开始考虑土-桩-结构相互作用的性状。这些桩必须支撑建筑物的重力，并将受到地震造成的侧向力。这两个巨大的力量需要非常坚固的桩。在本研究中，我们使用了两组桩来支撑建筑物。第一组采用柔性长桩作为建筑物自重，第二组采用刚性短桩抵抗地震动侧向力。我们将介绍土-桩-结构相互作用问题的基本思想和小型振动台试验结果。

In Japan, we started to study soil-pile-structure interaction problems about 30 years ago, but very few structural engineers considered lateral forces to design piles supporting building structures at that time. During the Niigata Earthquake (1964), Miyagiken-oki Earthquake(1978), Hyogoken-nanbu Earthquake (1995) and other large earthquakes, many piles were damaged severely and many buildings on these piles were inclined after the earthquake. In the last 20 years, many engineers have come to consider the behavior of soil-pile-structure interaction. The piles have to support the gravity weight of the building and will be subject to the lateral force caused by the earthquake. Very strong piles are needed for these two large forces. In this study, we use two groups of piles supporting the building. The first group has long-flexible-piles for the building gravity weight, and the second group has short-stiff-piles resisting the lateral forces due to earthquake ground motion. We will present the basic idea and the results of a small shaking table test of soil-pile-structure interaction problems for our new idea.