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Papers by David McCallen

Research paper thumbnail of Nevada - A Simulation Environment for Regional Estimation of Ground Motion and Structural Response

Research paper thumbnail of Predicted and measured deflections of the Schellbourne and Contact nuclear test canisters

A detailed study of stiffening schemes for nuclear test canisters has been performed. The study i... more A detailed study of stiffening schemes for nuclear test canisters has been performed. The study included both numerical computer simulations and field measurements of the deformations of canisters under carefully controlled applied loads. The results of the study provide quantitative information on the degree of stiffening which has been achieved by the various stiffening techniques. The work performed also allowed direct comparison between specialized reduced-order continuum canister models; large, discrete finite element canister models, and measured canister deflections. This report summarizes the computer simulations, discuses the effectiveness of the stiffening schemes, and documents the experimental data. 18 refs., 23 figs., 7 tabs.

Research paper thumbnail of Apparatus and method for stopping a vehicle

Research paper thumbnail of Apparatus for stopping a vehicle

An apparatus for externally controlling one or more brakes on a vehicle having a pressurized flui... more An apparatus for externally controlling one or more brakes on a vehicle having a pressurized fluid braking system. The apparatus can include a pressurizable vessel that is adapted for fluid-tight coupling to the braking system. Impact to the rear of the vehicle by a pursuit vehicle, shooting a target mounted on the vehicle or sending a signal from a remote

Research paper thumbnail of Mechanical behavior of nuclear test canisters

An equivalent continuum methodology is used to construct structural models of test canisters for ... more An equivalent continuum methodology is used to construct structural models of test canisters for numerical simulations and parameter studies. The continuum method models the canister structures with a solid beam-like structure which is /open quotes/equivalent/close quotes/ to the extent that it exhibits the same global planar force-displacement characteristics as the actual canister structure. The continuum models yield computationally efficient reduced

Research paper thumbnail of Ground Motion and Site Response in Las Vegas Seismic Ground Motion and Site Response in Las Vegas Valley, Nevada from NTS Explosions

Research paper thumbnail of Las Vegas Basin Seismic Response Project: Overview and Site Response

This presentation provides an introduction to a multi-institutional effort to characterize the se... more This presentation provides an introduction to a multi-institutional effort to characterize the seismic response of the Las Vegas Basin (LVB) to seismic ground motion. Las Vegas lies on top of a deep sedimentary basin (maximum depth 5-km) formed by extensional tectonics in the southern Basin and Range Province. The potential for large earthquakes in the region expose Las Vegas to seismic risk. Seismologists and engineers at LLNL, University of Nevada Reno (UNR) and University of Nevada Las Vegas (UNLV) are evaluating the response of the basin to seismic ground motion and its effect on structures. Recordings of earthquakes and historical nuclear explosions at the Nevada Test Site (NTS) are being used to evaluate the seismic response of the basin. Geotechnical investigations of specific sites are being performed to understand the relationship between ground motions and shallow seismic structure. In particular the presence of thick deposits of unconsolidated alluvial fill and strengthen...

Research paper thumbnail of Predicted deflections of the BARNWELL nuclear test canister

The magnitude of the deflections of stemmed nuclear test canisters has become a major issue in th... more The magnitude of the deflections of stemmed nuclear test canisters has become a major issue in the fielding of an event. With tight alignment tolerances becoming more commonplace, it is a concern that experimental physics data could be lost or significantly degraded in quality if deflections approach those measured in a number of past events. The BARNWELL canister is similar to the CONTACT canister in that it will have various stiffening schemes incorporated into its design to help reduce deflections. BARNWELL, however, will in all likelihood only be partially enclosed with doors (CONTACT was fully enclosed with doors). To assess the effect of these stiffening schemes and door configuration on the overall canister stiffness, computer models of the BARNWELL canister were constructed for numerical simulations. This report contains the results of the numerical simulations and comparisons between the predicted CONTACT and BARNWELL deflections. 8 refs., 11 figs., 1 tab.

Research paper thumbnail of Nevada - A Simulation Environment for Regional Estimation of Ground Motion and Structural Response

Research paper thumbnail of Literature survey of blast and fire effects of nuclear weapons on urban areas

Research paper thumbnail of Evaluation of an expedient terrorist vehicle barrier

Research paper thumbnail of High performance simulations for transformational earthquake risk assessments

Journal of Physics: Conference Series, 2009

Research paper thumbnail of The Las Vegas Valley Seismic Response Project: Ground Motions in Las Vegas Valley from Nuclear Explosions at the Nevada Test Site

Research paper thumbnail of Analysis of Multiple-Bay Frames Using Continuum Model

Journal of Structural Engineering, Feb 1, 1993

Research paper thumbnail of A continuum model for lattice structures with geometric and material nonlinearities

Computers Structures, 1990

Research paper thumbnail of An Explicit Integration Framework for Nonlinear Analysis of Suspension Bridges

Journal of Seismology and Earthquake Engineering, 2000

Research paper thumbnail of Supercomputing and nonlinear seismic structural response of freeway structures

The Loma Prieta earthquake stimulated a major reassessment of Bay Area structures to consider muc... more The Loma Prieta earthquake stimulated a major reassessment of Bay Area structures to consider much larger earthquakes than originally designed for. The supercomputers of the Lawrence Livermore National Laboratory were used to demonstrate the feasibility of nonlinear structural time history analysis to assess likelihood of failure of critical structures.

Research paper thumbnail of Considerations of the Use of 3-D Geophysical Models to Predict Test Ban Monitoring Observables

Research paper thumbnail of Combined sensing and simulation for enhanced evaluation of structures

Research paper thumbnail of Ground motion estimation and nonlinear seismic analysis

Site specific predictions of the dynamic response of structures to extreme earthquake ground moti... more Site specific predictions of the dynamic response of structures to extreme earthquake ground motions are a critical component of seismic design for important structures. With the rapid development of computationally based methodologies and powerful computers over the past few years, engineers and scientists now have the capability to perform numerical simulations of many of the physical processes associated with the generation of earthquake ground motions and dynamic structural response. This paper describes application of a physics based, deterministic, computational approach for estimation of earthquake ground motions which relies on site measurements of frequently occurring small (i.e. M < 3 ) earthquakes. Case studies are presented which illustrate application of this methodology for two different sites, and nonlinear analyses of a typical six story steel frame office building are performed to illustrate the potential sensitivity of nonlinear response to site conditions and p...

Research paper thumbnail of Nevada - A Simulation Environment for Regional Estimation of Ground Motion and Structural Response

Research paper thumbnail of Predicted and measured deflections of the Schellbourne and Contact nuclear test canisters

A detailed study of stiffening schemes for nuclear test canisters has been performed. The study i... more A detailed study of stiffening schemes for nuclear test canisters has been performed. The study included both numerical computer simulations and field measurements of the deformations of canisters under carefully controlled applied loads. The results of the study provide quantitative information on the degree of stiffening which has been achieved by the various stiffening techniques. The work performed also allowed direct comparison between specialized reduced-order continuum canister models; large, discrete finite element canister models, and measured canister deflections. This report summarizes the computer simulations, discuses the effectiveness of the stiffening schemes, and documents the experimental data. 18 refs., 23 figs., 7 tabs.

Research paper thumbnail of Apparatus and method for stopping a vehicle

Research paper thumbnail of Apparatus for stopping a vehicle

An apparatus for externally controlling one or more brakes on a vehicle having a pressurized flui... more An apparatus for externally controlling one or more brakes on a vehicle having a pressurized fluid braking system. The apparatus can include a pressurizable vessel that is adapted for fluid-tight coupling to the braking system. Impact to the rear of the vehicle by a pursuit vehicle, shooting a target mounted on the vehicle or sending a signal from a remote

Research paper thumbnail of Mechanical behavior of nuclear test canisters

An equivalent continuum methodology is used to construct structural models of test canisters for ... more An equivalent continuum methodology is used to construct structural models of test canisters for numerical simulations and parameter studies. The continuum method models the canister structures with a solid beam-like structure which is /open quotes/equivalent/close quotes/ to the extent that it exhibits the same global planar force-displacement characteristics as the actual canister structure. The continuum models yield computationally efficient reduced

Research paper thumbnail of Ground Motion and Site Response in Las Vegas Seismic Ground Motion and Site Response in Las Vegas Valley, Nevada from NTS Explosions

Research paper thumbnail of Las Vegas Basin Seismic Response Project: Overview and Site Response

This presentation provides an introduction to a multi-institutional effort to characterize the se... more This presentation provides an introduction to a multi-institutional effort to characterize the seismic response of the Las Vegas Basin (LVB) to seismic ground motion. Las Vegas lies on top of a deep sedimentary basin (maximum depth 5-km) formed by extensional tectonics in the southern Basin and Range Province. The potential for large earthquakes in the region expose Las Vegas to seismic risk. Seismologists and engineers at LLNL, University of Nevada Reno (UNR) and University of Nevada Las Vegas (UNLV) are evaluating the response of the basin to seismic ground motion and its effect on structures. Recordings of earthquakes and historical nuclear explosions at the Nevada Test Site (NTS) are being used to evaluate the seismic response of the basin. Geotechnical investigations of specific sites are being performed to understand the relationship between ground motions and shallow seismic structure. In particular the presence of thick deposits of unconsolidated alluvial fill and strengthen...

Research paper thumbnail of Predicted deflections of the BARNWELL nuclear test canister

The magnitude of the deflections of stemmed nuclear test canisters has become a major issue in th... more The magnitude of the deflections of stemmed nuclear test canisters has become a major issue in the fielding of an event. With tight alignment tolerances becoming more commonplace, it is a concern that experimental physics data could be lost or significantly degraded in quality if deflections approach those measured in a number of past events. The BARNWELL canister is similar to the CONTACT canister in that it will have various stiffening schemes incorporated into its design to help reduce deflections. BARNWELL, however, will in all likelihood only be partially enclosed with doors (CONTACT was fully enclosed with doors). To assess the effect of these stiffening schemes and door configuration on the overall canister stiffness, computer models of the BARNWELL canister were constructed for numerical simulations. This report contains the results of the numerical simulations and comparisons between the predicted CONTACT and BARNWELL deflections. 8 refs., 11 figs., 1 tab.

Research paper thumbnail of Nevada - A Simulation Environment for Regional Estimation of Ground Motion and Structural Response

Research paper thumbnail of Literature survey of blast and fire effects of nuclear weapons on urban areas

Research paper thumbnail of Evaluation of an expedient terrorist vehicle barrier

Research paper thumbnail of High performance simulations for transformational earthquake risk assessments

Journal of Physics: Conference Series, 2009

Research paper thumbnail of The Las Vegas Valley Seismic Response Project: Ground Motions in Las Vegas Valley from Nuclear Explosions at the Nevada Test Site

Research paper thumbnail of Analysis of Multiple-Bay Frames Using Continuum Model

Journal of Structural Engineering, Feb 1, 1993

Research paper thumbnail of A continuum model for lattice structures with geometric and material nonlinearities

Computers Structures, 1990

Research paper thumbnail of An Explicit Integration Framework for Nonlinear Analysis of Suspension Bridges

Journal of Seismology and Earthquake Engineering, 2000

Research paper thumbnail of Supercomputing and nonlinear seismic structural response of freeway structures

The Loma Prieta earthquake stimulated a major reassessment of Bay Area structures to consider muc... more The Loma Prieta earthquake stimulated a major reassessment of Bay Area structures to consider much larger earthquakes than originally designed for. The supercomputers of the Lawrence Livermore National Laboratory were used to demonstrate the feasibility of nonlinear structural time history analysis to assess likelihood of failure of critical structures.

Research paper thumbnail of Considerations of the Use of 3-D Geophysical Models to Predict Test Ban Monitoring Observables

Research paper thumbnail of Combined sensing and simulation for enhanced evaluation of structures

Research paper thumbnail of Ground motion estimation and nonlinear seismic analysis

Site specific predictions of the dynamic response of structures to extreme earthquake ground moti... more Site specific predictions of the dynamic response of structures to extreme earthquake ground motions are a critical component of seismic design for important structures. With the rapid development of computationally based methodologies and powerful computers over the past few years, engineers and scientists now have the capability to perform numerical simulations of many of the physical processes associated with the generation of earthquake ground motions and dynamic structural response. This paper describes application of a physics based, deterministic, computational approach for estimation of earthquake ground motions which relies on site measurements of frequently occurring small (i.e. M < 3 ) earthquakes. Case studies are presented which illustrate application of this methodology for two different sites, and nonlinear analyses of a typical six story steel frame office building are performed to illustrate the potential sensitivity of nonlinear response to site conditions and p...

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