The Open System for Earthquake Engineering Simulation (OpenSees) is a software environment for 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...

A wide range of numerical integration options are available in OpenSees to represent distributed plasticity or non-prismatic section details in force-based beam-column elements, i.e., across the entire element domain [0, L]. For the Tcl interpreter of OpenSees, there is a specific input format for each integration option that follows a common input format for the element tag, nodes, and transfo...

Description of geometric nonlinearity for beam-column analysis in OpenSees" (2013). ii Northeastern University was founded in 1898, as a private research university. Northeastern University is a leader in worldwide experiential learning, urban engagement, and interdisciplinary research that meets global and societal needs. Department of Civil and Environmental Engineering has over 100 years of ...

The OpenSees finite element software framework is extended for simulating fluid–structure interaction (FSI) by the particle finite element method (PFEM). At high levels of the framework, new classes handle meshing and interface detection of the fluid and structure domains and implement the fractional step method in order to solve the governing equations of linear momentum and mass conservation....

The simulation of structural and geotechnical systems is a critical step in their design and assessment. The purpose of an earthquake simulation is to estimate the performance of the system under seismic excitation or loads that represent the effects of an earthquake. Structural and geotechnical simulation has a long history of development in earthquake engineering. The computation required to ...

The finite-element (FE) method is widely recognized as a powerful tool in modeling structural and geotechnical systems and simulating their response to static and dynamic loads. In addition, numerical optimization is commonly used in many engineering applications, such as structural reliability analysis, FE model updating, structural identification, and structural optimization. This paper focus...

This paper presents a study that forms part of an ongoing project on the seismic retrofit of reinforced concrete (RC) structures with fibre-reinforced polymer (FRP). In this study, a stress-strain model for FRP-confined concrete subjected to cyclic loading was implemented into OpenSees to support the performance-based design of FRP jackets for the seismic retrofit of RC columns/structures. Init...

Seismic vulnerability assessment is crucial for evaluating the resilience of structures. OpenSees, an open-access and versatile tool, plays a pivotal role in accurately simulating complex behavior structures subjected to seismic loads. However, lacking built-in graphical user interface (GUI) one limitations OpenSees that can hinder usability accessibility. Moreover, users must rely on command-l...