Papers by Gilberto Mosqueda
Experimental and numerical studies are used to examine the behavior of friction pendulum ͑FP͒ bea... more Experimental and numerical studies are used to examine the behavior of friction pendulum ͑FP͒ bearings to multiple components of excitation. In the experimental studies, a scaled rigid-frame model representing a rigid bridge superstructure on four FP bearings is subjected to displacement-controlled orbits and earthquake simulations. Using the test data from bidirectional displacement orbits, the constant friction coefficient is calibrated for a rate-independent plasticity model for FP bearings. The earthquake test data are compared with numerical simulations to evaluate the efficacy of the calibrated models. The studies show that the coupling between the two orthogonal components is important for representing the behavior of FP bearings. Modeling of the vertical load on the bearings, and the consideration of this force variation on the bearing response is necessary for an accurate determination of the forces transmitted by the bearings into the substructure. Tridirectional testing of the rigid-block frame shows that the vertical ground motion component has a small effect on the response of a bridge isolated with FP bearings.
Journal of Structural Engineering-asce, 2008
ABSTRACT The hybrid simulation test method is a versatile technique for evaluating the seismic pe... more ABSTRACT The hybrid simulation test method is a versatile technique for evaluating the seismic performance of structures by seamlessly integrating both physical and numerical simulations of substructures into a single test model. Using hybrid simulation, the seismic response of complex structural systems partitioned into multiple large-scale experimental and numerical substructures at networked geographically distributed experimental and computational facilities can be evaluated. A scalable framework with a fault-tolerant distributed controller is presented to support the implementation of advanced hybrid testing methods with distributed substructures. The control strategy is based on a multithreaded simulation coordinator for parallel communication with remote sites and an event-driven controller at each remote experimental site to implement continuous loading. The distributed controller provides faster rates of testing and improved accuracy in the simulation results. The effectiveness of the proposed framework is demonstrated by computing the earthquake response of a six-span bridge model with multiple remote experimental and numerical column substructures distributed within NEES laboratories across the United States. Further, the distributed tests were implemented using a secure network link between the testing sites that was developed for the NEES cyber infrastructure.
Structures Congress 2012, 2012
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Papers by Gilberto Mosqueda