Dynamic Behavior of Prototype Interlocking Plastic-block Structure Using Locally Developed Low-cost Shake Table

Abstract

In area, most of the non-engineered structures are collapsed in earthquake due to strong ground motion of earth. In seismic active region there is significant loss of life due to lack of earthquake resistant-housing. In developing counties there is need to develop economic and earthquake-resistant housing. Interlocking plasticblock structure is good option for earthquake-resistant housing. Many researchers explored various interlocking techniques for construction, but there is a need to investigate the plastic-block structure. The overall aim of this research is to control damages and save precious human lives in future earthquake. In this research work, interlocking plastic-block structure behavior is studied under harmonic loading by using simple 1D shake table. Prototype interlocking plastic-block structure made of eight blocks having fixed base is tested using simple shake table.Similar structure with rubber band is also tested to enhance the integrity of structure. To record the structure response two accelerometers are installed: one at top of structure to record structure excitation while other at shake table to record base response. Response in terms of acceleration-time and displacement-time histories is recorded. Base shear- displacement curves, energy absorption, and damping are calculated. At the same time, empirical equations are established keeping in mind the interlocking plastic- blocks geometry, size, height of structure and input loading parameters. As expected, the structure having rubber band is stiffer than structure without rubber band. Column response without band has more relative displacement at top of structure compared to structure with rubber band.