Predictor‐corrector procedures for pseudo‐dynamic tests

Abstract

If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -To propose novel predictor-corrector time-integration algorithms for pseudo-dynamic testing. Design/methodology/approach -The novel predictor-corrector time-integration algorithms are based on both the implicit and the explicit version of the generalized-a method. In the non-linear unforced case second-order accuracy, stability in energy, energy decay in the high-frequency range as well as asymptotic annihilation are distinctive properties of the generalized-a scheme; while in the non-linear forced case they are the limited error near the resonance in terms of frequency location and intensity of the resonant peak. The implicit generalized-a algorithm has been implemented in a predictor-one corrector form giving rise to the implicit IPC-r 1 method, able to avoid iterative corrections which are expensive from an experimental standpoint and load oscillations of numerical origin. Moreover, the scheme embodies a secant stiffness formula able to approximate closely the actual stiffness of a structure. Also an explicit algorithm has been implemented, the EPC-r b method, endowed with user-controlled dissipation properties. The resulting schemes have been tested experimentally both on a two-and on a six-degrees-of-freedom system, exploiting substructuring techniques. Findings -The analytical findings and the tests have indicated that the proposed numerical strategies enhance the performance of the pseudo-dynamic test (PDT) method even in an environment characterized by considerable experimental errors. Moreover, the schemes have been tested numerically on strongly non-linear multiple-degrees-of-freedom systems reproduced with the Bouc-Wen hysteretic model, showing that the proposed algorithms reap the benefits of the parent generalized-a methods. Research limitations/implications -Further developments envisaged for this study are the application of the IPC-r 1 method and of EPC-r b scheme to partitioned procedures for high-speed pseudo-dynamic testing with substructuring. Practical implications -The implicit IPC-r 1 and the explicit EPC-r b methods allow a user to have defined dissipation which reduces the effects of experimental error in the PDT without needing onerous iterati...

An overview of seismic hybrid testing of engineering structures

“…See also [5], [51], or [52] for good overviews of numerical time integration algorithms in hybrid testing.…”

“…The scheme was developed in order to combine the speed of computation from explicit methods with numerical dissipation. Nakashima & Kato, [72] proposed an error compensation technique called the I-Modification that required the predictor stiffness of the structure and the difference between measured and command displacements [51]. Bursi and Shing, [65] showed that its use with the α-OSM mitigates the effects of undershoot type experimental errors by introducing energy dissipation.…”

“…Bonelli and Bursi, [51] investigated the feasibility of implementing a predictorcorrector procedure into the generalised implicit Chung Hulbert method [74] (termed α-CH)…”

Communication Development and Verification for Python-Based Machine Learning Models for Real-Time Hybrid Simulation

“…Many of the direct integration methods were developed for pure analytical solutions and not necessarily suitable for HS tests (Schellenberg et al, 2009b). Because of this need, one of the main focuses of HS/RTHS research has been to develop numerical integration algorithms that are specialized to solve the substructured equation of motion in HS to have accurate and reliable test results (e.g., Chang, 2002;Bonelli and Bursi, 2005;Chen et al, 2009;Kolay and Ricles, 2014). However, the developed HS-specific methods have still some challenges and limitations, particularly for complex and large analytical substructures with many degrees of freedoms and/or large non-linearities.…”

11.06: Application of hybrid simulation for the evaluation of the buckling response of steel braced frame columns

“…2,3]. Key improvements include the development of robust numerical integration techniques [4] and effective delay compensation approaches [5], the implementation of geographically distributed hybrid simulations [6,7], and the development of force based control methods [8]. Past studies focused on the accuracy, stability and reliability of the hybrid method and only a few tests examined the response of structures in which hybrid simulation is used as a seismic test method.…”