XTRACT Cross Sectional Analysis of Structural Components

Tutorial CIE 525 Concrete Structures

September 11, 2012

About the XTRACT Software

Created by Dr. Charles Chadwell at UC Berkeley

Original name: UCFyber

Acquired by Imbsen Software Systems in 2001

Renamed to: XTRACT

XTRACT is a general cross-sectional analysis software for analysis of any section shape and material subjected to any force-based loading

Moment-Curvature Analysis of a Beam Section Using XTRACT

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1.5 concrete cover

#5 ties spaced @ 4 on center

#9 main reinforcing bars

n4

1. Create New Project

2. Cross Section and Beam Core Details

3. Geometry

4. Materials

Typical values for the crushing and spalling strain for unconfined concrete are 0.003 and 0.006, respectively (ACI 318-11 R10.2.3).

Failure Strain If analyzing a section where cover spalling is not to control the termination of the analysis, enter a large number in this text field (e.g. 1.0 - strain of 100%). If analyzing a cross section where computation should terminate when the cover spalls, enter the crushing or spalling strain in this text field.

Unconfined Concrete Model for Concrete Cover

Mander Confined Concrete Model for Beam Core

Note: Typically, to go beyond a 0.02 strain for confined concrete, the details and construction quality need to be carefully controlled.

Longitudinal Steel (Parabolic Strain Hardening Steel Model)

5. Create Section

Unconfined Concrete Cover Model

Confined Core Model

Shape Boundaries

6. Copying and Modifying the Section

7. Loading and Analysis

XTRACT analysis types: -Moment Curvature, Axial -Force-Moment Interaction -Capacity Orbit (moment-moment interaction)

Moment Curvature Analysis

7. Analysis (Rebar Strain Hardening Model)

7. Analysis (Elasto-Plastic Rebar Model)

Add:

a.) MATERIALS Bilinear Steel Model

b.) New Section from Template