A Scaled Diagrid Building Model For Shake Table Test: A Simplistic Cost-Effective Approach

Abstract

This study presents a cost-effective simplistic approach towards shake table experiment on a scaled DiaGrid building model. The DiaGrid mechanism consists of inclined columns in contrast to vertical columns in conventional structural mechanisms. The inclined columns convert all the external actions into axial actions (i.e. axial compression-tension), which makes the mechanism more stiff in resisting lateral forces, mainly high wind gusts and severe earthquake excitations. This study is focused to discuss a simplistic approach for constructing a scaled DiaGrid building model as well for performing a shake table test with few past severe earthquake time histories. The laws of similitudes and the availability of testing resources are the key factors limiting the model's scaling.

A Finite element software SAP2000 is used to validate the physical test results. Sticking to the simplistic approach, major parameter targeted for verifying results is ‘lateral displacement’. Displacement values for all the considered earthquakes arrive close to the values obtained in FE analysis. The behavior of an actual DiaGrid structure under future earthquakes can be predicted by performing the simplistic shake table test on a small scale structure subject to probable, non-predictable,  or even non-realistic ground shakings that might occur during the life span of the building.