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Hybrid geotechnical and structural seismic isolation: Shake table tests

机译：混合岩土性和结构地震隔离：摇动台测试

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This paper proposes a hybrid seismic isolation system composed of geotechnical (a layer of sand or gravel as foundation soil) and structural isolation (a low-friction foundation sliding layer), aiming to effectively improve the seismic performance of rural buildings with an economical solution. The isolation system is most suitable for low-rise buildings in high-seismic areas. It is also effective in colder climates as replacing sand or gravel as the foundation soil eliminates frost heave. Shake table testing of three 1/4 scale models of two-story masonry buildings was carried out: an unreinforced brick masonry structure (model MA, without isolation), an identical structure with geotechnical isolation (model MS, with a layer of gravel as the foundation soil), and an identical structure with hybrid geotechnical and structural isolation (model MC). The dynamic characteristics and responses of the three structures were assessed and compared. Test results showed that shear failure of brick walls of model MA occurred at the first story when the input peak ground acceleration reached 0.44g. For model MS, a similar shear failure mode occurred when the acceleration reached 1.02g. Model MC relied on the layer of gravel for isolation before 0.44g, and then several cracks occurred at the foundation sliding layer, which was a sign of sliding. The plastic damage was mainly concentrated in the second story, and model MC showed bending-dominated deformation when the acceleration increased to 1.24g. This study clearly demonstrates the improved seismic performance and technical feasibility of the cost-effective hybrid isolation system.
机译：本文提出了一种由岩土工程（一层砂砾或砾石土壤）和结构隔离（低摩擦基础滑动层）组成的混合地震隔离系统，旨在有效地提高农村建筑物的地震性能，具有经济的解决方案。隔离系统最适合高层地震区域的低层建筑物。由于基础土壤消除霜冻，因此在较较冷的气候下也是有效的。进行了三个1/4级模型的摇头表测试了两层砌体建筑物：一个不合因的砖砌砖结构（型号MA，无隔离），具有岩土隔离的相同结构（型号MS，带有一层砾石基础土壤），以及杂交地岩土和结构隔离的相同结构（型号MC）。评估和比较三种结构的动态特性和响应。测试结果表明，当输入峰接地加速度达到0.44g时，在第一个故事发生砖墙的剪切失效。对于模型MS，当加速达到1.02g时，发生类似的剪切故障模式。 MC依赖于砾石层以在0.44g之前隔离，然后在基础滑动层发生几个裂缝，这是滑动的标志。塑料损坏主要集中在第二个故事中，当加速度增加到1.24克时，​​MC显示出弯曲主导的变形。本研究清楚地表明了具有成本效益的混合隔离系统的改善的地震性能和技术可行性。

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