DEVELOPMENT OF FEEDBACK LOOP ALGORITHM FOR PSEUDO-DYNAMIC TESTING

Abstract

In understanding the dynamic behaviour of many structures where analytical modelling does not suffice and in the development of the codal provisions, experimental testing has remain the common thing to rely on. Many experimental testing procedures have been developed in the past and is still being updated based on the requirement of the testing. Pseudodynamic testing procedure is one of the many testing methods for large scale testing which has the simplicity of quasi-static testing and the reliability of the shake table testing method. Here, various testing methods has been described and then the development of pseudodynamic testing method is presented. The testing procedure, numerical techniques and the error in the testing method is discussed further. For the development of this testing facility in pseudodynamic laboratory at IIT Roorkee, this study is done. For the analytical simulation of pseudodynamic testing, a code is developed which updates the stiffness of the non-linear member during dynamic analysis. The code is verified with a solved example and then is used for the analytical simulation of a steel cantilever column as a SDOF system. The simulation is done for three different earthquakes and the results are presented thereafter