2019 State of the University Address

The University of Texas at Austin writes about Good Systems in the 2019 State of the University Address in an article published in 2019.Office of the VP for Researc

Preliminary Report on the Seismological and Engineering Aspects of the January 17, 1994 Northridge Earthquake

This report on the seismological and engineering aspects of the 17 January, 1994, Northridge earthquake was printed on 24 January, 1994, one week after the main event. Its purpose is to provide a brief overview of preliminary observations related to the earthquake. The primary audience is seismologists, engineers and related professionals in the earthquake hazard and earthquake risk mitigation field. The report is preliminary in the sense that significant data collection and analysis remain to be completed. Reports containing more complete data and analysis may be issued at a later date. Immediately following the 17 January, 1994, Northridge earthquake, the Earthquake Engineering Research Center dispatched a reconnaissance team to the epicentral region. This report, issued one week after the earthquake, provides an overview of the seismological and engineering aspects of the earthquake and associated aftershocks. A slide set containing approximately 1 00 slides obtained during the reconnaissance, including all slides and photographs in this report, is being prepared. Copies of the set are available at cost. To obtain a set, write to EERC Reports, 1301 S. 46th Street, Richmond, California 94804, e-mail to [email protected], call510-231-9468, or fax 510-231-9461.National Science Foundation///Virginia, Estados UnidosUCR::Vicerrectoría de Docencia::Ingeniería::Facultad de Ingeniería::Escuela de Ingeniería Civi

Seismic soil-structure interaction in buildings. I: Analytical aspects

Recent improvements in seismological source modeling, analysis of travel path effects, and characterization of local site effects on strong shaking have led to significant advances in both code-based and more advanced procedures for evaluating seismic demand for structural design. A missing link, however, has been an improved and empirically verified treatment of soil-structure interaction (SSI) effects on both the strong motions transmitted to structures and the structural response to these motions. This paper describes analysis procedures and system identification techniques for evaluating inertial SSI effects on seismic structural response. The analysis procedures are similar to provisions in some building codes but incorporate more rationally the influence of site conditions and the foundation embedment, flexibility, and shape on foundation impedance. Implementation of analysis procedures and system identification techniques is illustrated using a building shaken during the 1994 Northridge earthquake. The analysis procedures predict the observed SSI effects accurately. A companion paper applies these analyses to empirically evaluate SSI effects using available strong motion data from a broad range of sites and then develops general conclusions regarding SSI effects on seismic structural excitation and response

An object-oriented software environment for collaborative network simulation

the network-based simulation of structural and geotechnical systems. The software design of the structural and geotechnical models in OpenSees is modular and hierarchical to mirror the equations of structural mechanics. The mathematical software components for computational simulation are also modular, allowing new components to be added to the framework. The ability to perform networkbased structural simulation with OpenSees follows directly from the modular software design because the components necessary for network-based simulation can be added to the framework as another implementation of an object than can be communicated between processors over a network. Modules for network-based simulation derive their behavior from the existing components in OpenSees, which are also movable objects that can be sent over communication channels during a computational simulation. New networked-based applications in OpenSees include parallel computation, databases, and hybrid experimental methods

An Open Collaborative Model for Development of Finite Element Program

An open collaborative model for development of structural analysis program is presented in this paper. The main design principle of this framework is to keep the kernel flexible and extendible so that the researchers and engineers can easily incorporate new element technologies and solution strategies. The distributed element service over the Internet shows that the open collaborative model could be a powerful tool for incorporating legacy code as well as new developments