Title: Real Time Hybrid Simulation Testing of a Curtain Wall System with Online Model Updating

Principal Investigator: Khalid M. Mosalam

PI’s Affiliation: University of California, Berkeley, USA

Co-PI at Tongji University: Wensheng Lu

Abstract:

Real Time Hybrid Simulation (RTHS) with Online model updating increases the application range of hybrid simulation, since it allows reliable and realistic earthquake response investigation of structures consisting of many elements with identical mechanical properties by testing one (or a few) of the elements and analytical modeling of the others simultaneously using the data from the tested elements. The necessity and potential benefits of this method have been demonstrated with the conventional hybrid simulation (HS) of the zonal hanging glass curtain wall (CW) of Shanghai Tower, which was conducted in University of California, Berkeley (UCB), including HS without model updating and HS with off-line modeling updating. This project aims at building up a generic RTHS platform with model updating function (RTSHMU), based on the widely used hybrid simulation tools of OpenSees as the computational platform and OpenFresco as the middleware. In order to build this platform, the numerical simulations of commonly used hysteresis models, such as Bouc-Wen and Giuffre-Menegotto-Pinto, will be conducted firstly using the parameter identification techniques, such as constrained unscented Kalman filter, to develop the intended optimization parameter identification method. The proof-of-concept tests will be conducted to verify and improve the feasibility of the generic RTHSMU system in UCB and Tongji University (TJU). After verification, the RTHSMU system developed on Siping campus will be used to investigate the seismic performance of complicated CW with vertical excitation. Conducted RTHS will also be verified by testing a subsystem of the complete CW system with multi-directional & multi-point excitations, by utilizing the shaking tables of TJU. An analytical model of the curtain wall system will be developed and tuned according to the tests conducted with the RTHSMU system. Performance-based earthquake engineering (PBEE) analyses conducted on the analytical model will be used to evaluate and enhance the proposed ILEE rating system