OpenSees implementation of a single ground improvement (GI) element in a continuum soil domain is described here. The Unit Cell concept is adopted to develop the ground improvement layout. The unit cell consists of a single GI element located in the center of its equivalent influence zone. The model represents a GI element located on… Read More
Subgrade reaction modulus is the ratio of soil pressure to deflection. This modulus is widely used in structural design of mats and slabs. The structural design is completed by structural engineer of record (SEOR) where he/she utilizes the concept of Beam on Nonlinear Winkler Foundation in order to estimate the pressure of soil as well… Read More
This Tcl code creates full-scale three-dimensional continuum model of Meloland Road Overpass (MRO) located in El-Centro, California. The code is generic and can be modified to simulate any two-span bridge with a structure similar to MRO. Ground motion can be applied at the model base in two horizontal directions. Please read the article about base… Read More
You can use this code to (i) compute spectral acceleration response spectrum of a given ground motion, and (ii) compute acceleration, velocity and displacement time histories for a single-degree-of-freedom (SDOF). Numerical integration is implemented by using Newmark-bata method. The code solves the motion equation for a SDOF represented by a mass and dashpot as shown… Read More
This C++ code performs liquefaction triggering analysis per Youd et al. (2001) and Boulanger and Idriss (2014) approaches. The input for the code is CPT data in the format of “.txt”. The input text file should contain depth (ft) in column 1, uncorrected cone resistance (tsf) in column 2, sleeve friction (tsf) in column 3,… Read More
Open System for Earthquake Engineering Simulation (OpenSees) is a finite element program developed by McKenna and Fenves (2001) at University of California, Berkeley. The software is not commercialized yet, and it is still an open-source program to date, it has mostly been used in academia by several research teams around the world. OpenSees employs object-oriented… Read More
ABAQUS is a finite element computer program that can be used for two-dimensional and three-dimensional analyses of complex geotechnical engineering systems. The program is powerful and robust however it may not be an appropriate tool for analysis of liquefaction. The software was originally released in 1978 by a company called Hibbitt, Karlsson & Sorensen, Inc., (HKS)… Read More
FLAC, Fast Lagrangian Analysis of Continua, is numerical modeling software for advanced geotechnical analysis of soil, rock, groundwater, and ground support in both two- and three-dimensions. FLAC is used for analysis, testing, and design by geotechnical, civil, and mining engineers. It is designed to accommodate any kind of geotechnical engineering project that requires continuum analysis. The software was first developed in 1986 by Itasca… Read More
PLAXIS bv is based on the finite element method and intended for 2-Dimensional and 3-Dimensional engineering, design and analysis of soil and rock deformation and stability, soil-structure interaction, groundwater, and heat flow. The software is capable of computing static and seismic response of complex engineering problem such as tunnels, piles foundations, bridge piers, etc. The development… Read More
OpenSees implementation of a single pile embedded in a continuum soil domain is described here. The codes are generic and can be modified for various soil domain dimensions, pile depth and soil layers. The file is capable of analyzing seismic response of a single pile system both in dry and saturated soils where liquefaction can… Read More