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FRAME3D V2.0 - A Program for the Three-Dimensional Nonlinear Time-History Analysis of Steel Structures: User Guide

Krishnan, Swaminathan (2009) FRAME3D V2.0 - A Program for the Three-Dimensional Nonlinear Time-History Analysis of Steel Structures: User Guide. Earthquake Engineering Research Laboratory , Pasadena, CA. (Submitted) http://resolver.caltech.edu/CaltechEERL:EERL-2009-04

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Abstract

This is Version 2.0 of the user guide and should be used along with Version 2.0 of the program. Updates include: 1. Realistic PMM interaction surfaces for plastic hinge elements (output file PMM). 2. 5-Segment modified elastofiber element for brace and slender column modeling. 3. Eigen value problem solver using subspace iteration (output files MODES and EIGEN). 4. Output the sum of forces of groups of elements (output file ELMGRPRES). Additional input is required as a result of these additions to the program. However, the example input files shown in chapter 6 correspond to the input format from Version 1.0 and do not reflect the changes in the input file from Version 1.0 to Version 2.0. Updates in Version 1.1 include: 1. Output files FRAC, FRACSUM, and FRACTOT, summarizing the fractures in the elastofiber beam elements; 2. Output file RUP listing the fibers that have ruptured during the course of the analysis; 3. Output file FAIL listing the elastofiber elements that have a complete segment failure; 4. Output files FEMA356 and PERF summarizing the performance of the beams, columns, and panel zones, relative to the Federal Emergency Management Agency document FEMA356 (FEMA 2000) acceptance criteria; 5. Output files XDRFT, YDRFT, AVGPKDRFT, and PKDRFT listing the average and peak interstory drifts in the building. Additional input is required for this output processing. In addition, some typographical errors in the version 1.0 of the user guide were also corrected, the most notable of these being sections 4.1.8 and 4.1.9 dealing with elastofiber element fiber fracture. FRAME3D is a program for the three-dimensional nonlinear analysis of steel buildings. It aims to overcome the computational challenges posed by full 3D analysis of steel buildings subject to earthquake ground motion through efficient finite elements that are designed to capture the essence of material behavior and geometry evolution. The element library consists of a plastic hinge beam element, an elastofiber beam element, a 5-segment modified elastofiber element, a panel zone element, a 4-noded diaphragm element to model floor slabs, and an elastic translational/rotational spring element to model foundations and compliant supports. The program utilizes a Newton-Raphson iteration strategy applied to an implicit Newmark timeintegration scheme to solve the nonlinear equations of motion at each time-step. Geometric nonlinearity and shear deformation are included in the formulation. This document serves as a User Guide to the program. All the input and output variables encountered by the user are described here along with brief descriptions of the various types of elements. In addition, 2 examples illustrating the capabilities and usage of the program are presented. Finally a glossary of all the variables is alphabetically listed at the end of the document.


Item Type:Report or Paper (Technical Report)
Group:Earthquake Engineering Research Laboratory
Record Number:CaltechEERL:EERL-2009-04
Persistent URL:http://resolver.caltech.edu/CaltechEERL:EERL-2009-04
Usage Policy:You are granted permission for individual, educational, research and non-commercial reproduction, distribution, display and performance of this work in any format.
ID Code:26567
Collection:CaltechEERL
Deposited By: Imported from CaltechEERL
Deposited On:05 May 2009
Last Modified:26 Dec 2012 14:00

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