Layered Soil-Synthetic Liner Base System to Isolate Buildings from Earthquakes

对于建筑师和结构工程师来说，使用基础隔震技术进行结构抗震设计的重要性越来越明显。迄今为止，已经提出了许多不同类型的基础隔离器，通常是复杂的机械系统，需要在建筑物下方增加一层。现有的隔离系统要么是纯摩擦型，要么是柔性型，要么是两者的结合。它们通过限制摩擦效应和/或延长整个系统的自然振动周期来减少地震引起的结构侧向惯性力。本课题研究了一种由土工合成材料衬垫和土层交替构成的新型地基隔震系统。土工膜和土工织物通常具有非常低的摩擦系数。分层土工织物/土工膜-土壤系统通过土工合成材料的低摩擦特性和土层的灵活性，提供了一种实用、低成本、安装简单的基础隔离系统。土层的滞回阻尼和建筑物基底周围的软回填材料可以限制结构的侧向挠度。这个研究项目是小企业创新研究项目的第一阶段。

The importance of aseismic design of structures using base isolation techniques is becoming increasingly evident to architects and structural engineers. Many different types of base isolators, generally complex mechanical systems which require an extra floor beneath the building, have been proposed to date. Existing isolation systems are either of a pure-friction or flexible type, or a combination of the two. They reduce earthquake-induced lateral inertial forces on structures through limiting friction effects and/or lengthening the natural period of vibration of the total system. This research project studies a new base isolation system comprised of alternate geosynthetic liners and soil layers. Geomembrane and geotextile geosynthetics typically have very low friction coefficients. A layered geotextile/geomembrane-soil system provides a practical, low-cost, and simple-to- install base isolation system through low frictional properties of geosynthetics and the flexibility of a soil layer. Lateral deflection of structures may be limited by hysteretic damping of the soil layer and by soft backfill materials around the building basement. This research project is Phase I of a Small Business Innovation Research Project.