SoftwareCategory:Seismic and Earthquake

Software Categories > Seismic and Earthquake

• ADAP88 - Legacy software from 1992 for modeling and dynamic analysis of concrete arch dams. Source code in FORTRAN and related reports can be downloaded from the earthquake engineering online archive maintained by University of California Berkeley. ADAP-88: Nonlinear Earthquake Analysis of Concrete Arch Dams Mojtahedi, Soheil; Fenves, Gregory L.; Reimer, Richard B. Department of Civil and Environmental Engineering, University of California, Berkeley, 1992, The modeling and dynamic analysis of concrete arch dams, the impounded water and foundation rock, is an important step in the earthquake safety evaluation of such systems. A linear earthquake analysis assuming an arch dam is an elastic monolithic structure usually shows large tensile stresses that exceed the tensile strength of concrete. Because arch dams are constructed as cantilever monoliths, the joints between the monoliths cannot develop the tensile stress predicted in a linear analysis. In reality, the contraction joints are expected to open and close during an earthquake, releasing arch stresses and redistributing the internal forces. ADAP-88 is a finite element analysis program for computing the earthquake response of arch dams including the nonlinear effect of contraction joint opening. The nonlinear joint elements are combined with shell, solid and fluid finite elements to model a complete arch dam system. Special consideration is given to resolving the stress distribution near the joints by using a refined mesh of solid elements. A numerical procedure for solving the equations of motion assumes that the nonlinearity in the model is restricted to the joints. The cantilever monoliths between contraction joints are modeled as linear substructures, resulting in a significant reduction of computation in the iterative solution of the nonlinear equations of motion. ADAP-88 includes a finite element mesh generator for typical arch dam geometries. The computer program RESVOR is used to compute the added mass for the water impounded in the reservoir, assuming the fluid is incompressible.
• ASKxELP - Semi-legacy software from 1999 to model the impact of seismic risk on a territory with electric power networks. Source code in FORTRAN and related reports can be downloaded from the earthquake engineering online archive maintained by University of California Berkeley. ASKxELP: Assessment of Seismic RisK for ELectric Power Networks Giannini, Renato; Pinto, Paolo E.; Vanzi, Ivo 1999, ASKxELP is a Fortran computer program which models two different but interacting aspects of the seismic risk on a territory: first, the seismic behavior of an Electric Power Network (EPN), from both the structural and electric viewpoints and, secondly, the expected number of casualties in the municipalities. Interaction is intended in the sense that, electric power being essential for emergency operations (hospitals, telecommunications, emergency management centers, etc.), complete or partial blackout at a point in the affected area increases the time of response for rescue and hospitalization the injured. EPN's are extremely vulnerable lifelines since they contain a large number of pieces of equipment not designed to withstand lateral forces. This equipment is concentrated in the stations, or nodes of the network. Line malfunctions originating from any station may spread to significant parts of the system and cause a larger scale blackout. As a local damage indicator, the number of casualties is used; this computed as the product of the population and the percentage of casualties in the population modeled as a random function of the local earthquake intensity. The program allows: 1. a look at only the network, or only at the casualties within the territory, or at their interaction 2. performing either scenario studies, conditioning the results to seismic events of given magnitude and location, or full reliability studies, considering different sources of randomness (earthquake magnitude and location, attenuation, etc.) 3. analysis of large scale system behavior with synthetic indexes, or behavior at a small scale, with analytical indexes giving detailed territorial information. Synthetic indexes are useful from the network manager's viewpoint whereas analytical indexes are useful from the local community's perspective. Results are output either to a text file or a file post-processed with an external graphic program (PLOTxELP)to show the statistical results in the territory.
• BASSIN - Legacy software from 1983 to compute three-dimensional dynamic response of an arbitrarily configured, elastic, bridge/abutment/backfill system. Source code in FORTRAN and related reports can be downloaded from the earthquake engineering online archive maintained by University of California Berkeley. BASSIN: Dynamic Analysis of Bridge/Abutment/Backfill Systems Subjected to Traveling Seismic Waves Dendrou, Basile Agbabian Associates, El Segundo, California, 1983, The BASSIN methodology has the following features: It computes the three-dimensional dynamic response of an arbitrarily configured, elastic, bridge/abutment/backfill system. It assumes this system to be underlain by a soil continuum that is represented as an elastic half- space. It represents seismic input motions as being harmonic and induced by planar P-, SV-, SH-, or Rayleigh waves with arbitrary wavelength, amplitude, and direction of incidence. The methodology uses a substructure approach in which the structure (which comprises the bridge, abutment, and backfill) is represented using a three-dimensional finite element model, and the underlying soil continuum is represented using a boundary element approach. The finite element model defines the stiffness matrix, mass matrix, and fixed-base nodes for the structure. The boundary element approach characterizes the underlying soil medium using frequency- dependent impedance matrices and driving force vectors that also incorporate the free-field wave motions. Compatibility and equilibrium requirements at the soil/structure interface are used to couple these substructures. The steady-state response of the soil/structure system is then computed.
• ISADAB - Legacy software from 1986 for the transverse inelastic analysis of reinforced concrete highway bridges. Source code in FORTRAN and related reports can be downloaded from the earthquake engineering online archive maintained by University of California Berkeley. ISADAB: Inelastic Static and Dynamic Analysis of Bridges Saiidi, Mehdi; Lawver, Renee A.; Hart, James D. Civil Engineering Department, University of Nevada, Reno, Nevada, 1986, ISADAB was developed for the transverse inelastic analysis of reinforced concrete highway bridges. The following tasks can be carried out by the program: (a) static analysis, (b) free-vibration analysis for initial displacements caused by static loads, (c) frequency analysis based on instantaneous stiffness during static loading, and (d) earthquake response analysis. The nonlinear effects are accounted for by incorporating translational and rotational springs at abutments, pier foundations, and at the base of piers. The deck and piers are treated as line elements. Two hysteresis models are used to represent the cyclic behavior of the nonlinear components: the Ramberg-Osgood model (for abutment springs) and the TQ-Hyst model (for pier and foundation springs), which operates on a tri-linear primary curve.
• Lateral Worx - Lateral Worx is a versatile program for lateral design of light frame buildings with CAD interface. Comprehensive calculation report and export of shear wall plans to CAD. Design buildings with multiple plate heights, complicated shear transfer and drag elements.
• SPECTR - Legacy software from 1972 that evaluates dynamic response spectra at various periods and presents the results as a log-log plot. Source code in FORTRAN and related reports can be downloaded from the earthquake engineering online archive maintained by University of California Berkeley. SPECTR: Spectra Response Analysis Donovan, Neville C. Dames and Moore, San Francisco, California, Modified: T.F. Blake, Newbury Park, California [PC DOS version] 1990., 1972, The program evaluates dynamic response spectra at various periods and presents the results as a log-log plot. On the basis of a given time-acceleration record, the program numerically integrates the normal convolution time integral for various natural periods and desired damping ratios. Relative displacements, relative and pseudo-relative velocities, absolute and pseudo-absolute accelerations are computed for natural periods from .01 seconds to 100 seconds. The program provides tables of displacement, velocity, and acceleration values with three measures of spectral intensity. A printer plot of desired damping ratios of the pseudo-relative velocity vs. natural period is presented on a 2 inch by 2 inch log-log grid.