NEESR-II: System Behavior Factors for Composite and Mixed Structural Systems

Concrete-filled Steel Tube Research:  Project Website

Project Overview

This project is to develop system performance factors (R, C_d, and W_o) for composite frame structural systems and to provide practical guidelines for the analysis and design of such structures.  The project will develop advanced computational models to (a) conduct parametric studies on composite frames to develop rational systems factors and (b) develop simplified recommendations for the equivalent rigidities to be used for composite beam-column elements and their connections in braced and unbraced mixed and composite frames subjected to large cyclic drifts.  The project will use the NEES MAST Facility at the University of Minnesota to test a series of 20 full-scale slender composite beam-columns in order to develop data on the evolution of the stiffness and strength of these elements when subjected to large lateral displacements.    This data will fill gaps in our current databases and provide a unique series of well-controlled tests to allow for the calibration of advanced, fiber-based analytical models for composite beam-columns.  In addition, experimental data will be collected on the behavior and performance of connections of composite beam-columns to beams and foundations in order to calibrate component models. The main deliverables will be two-fold: (a) a series of design recommendations formatted in code language for direct incorporation into the revised structural system tables being developed for the 2010/11 cycle of ASCE 7 and the AISC Seismic Provisions, along with design examples to illustrate and clarify their applicability; and (b) a detailed description of the advanced models developed that will help researchers pursue similar studies for other composite and mixed structural systems.

Project Staff

FACULTY INVESTIGATORS

PRINCIPAL INVESTIGATOR: GEORGIA INSTITUTE OF TECHNOLOGY

Roberto T. Leon, Professor and President, George E. Brown, Jr. Network for Earthquake Engineering Simulation, (404) 894-2220, (404) 894-0211(fax), roberto.leon@ce.gatech.edu

Location: School of Civil and Environmental Engineering, 790 Atlantic Avenue, Georgia Institute of Technology, Atlanta, Georgia 30332-0355 USA

CO-PRINCIPAL INVESTIGATOR: UNIVERSITY OF ILLINOIS AT URBANA-CHAMPAIGN

Jerome F. Hajjar, Professor, Narbey Khachaturian Faculty Scholar, IT Director, MUST-SIM Facility, and Deputy Director, Mid-America Earthquake Center: 2129b Newmark Civil Engineering Laboratory, (217) 244-4027, (217) 265-8040 (fax), jfhajjar@uiuc.edu

Location: Department of Civil and Environmental Engineering, MC-250, 205 North Mathews Avenue, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-2352 USA

POST-DOCTORAL ASSOCIATES, GRADUATE STUDENTS, AND UNDERGRADUATE STUDENTS:

Current

Mark Denavit, Graduate Research Assistant, University of Illinois at Urbana-Champaign, denavit2@uiuc.edu

Project Schedule

Project Initiation:  October 1, 2006

Experimental Testing at MAST:  2007-2009

Project Termination, September 30, 2009