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The Phase 2 Steel Project has a number of inter-related, problem-focused investigations into various aspects of the steel moment frame problem. These are broken into the following six basic areas:
- Materials and Fracture - evaluating the basic material characteristics of steels used in building construction in seismic regions of the United States
- Joining and Inspection - addressing issues related to welding, bolting, and in-process and post-earthquake inspection
- Connection Performance - beam-column connection modeling and full-scale testing
- System Performance - parametric analytical studies of steel frames with varying ground motions, modeling assumptions, etc.
- Performance Prediction and Evaluation - development of rational and reliable performance-based design procedures for steel moment frames
- Economic, Social, and Political Aspects - identifying opportunities for and barriers against implementing improved seismic design criteria
- Data on Buildings Inspected Under the L.A. Inspection Ordinance
- Detailed Data Collection for Selected WSMF Buildings
- Evaluation of Inspection Reliability and Identification of W1a Damage
- Institutional Demands Caused by WSMF Damage
- Damage to Welded Steel Moment Frame Buildings in Earthquakes other than Northridge
- Coordination for Topical Investigations on the Performance of Steel Buildings in Past Earthquakes
Performance of Steel Buildings in Past Earthquakes
Assess Current Knowledge
- Database Development for Sorting and Summarizing Test Results
- Maintenance and Updates of the Literature Database
Materials and Fracture
- Characterization of the Material Properties of Rolled Sections
- Influence of the Through-Thickness Properties Upon Beam to Column Flange Welds
Joining and Inspection
- Effects of the Relative Strength of Base and Weld Metal on Weldment Behavior at Different Strain Rates
- Effects of Weld Metal and HAZ Notch Toughness on Welded Joint Behavior
- Sensitivity of Welded Joints to Variations in Welding Procedures, Parameters and Conditions
- Reliability of Non-Destructive Evaluation Methods for Welded Joints - Establish Model UT Procedures
- Synthesize Data Model for Weld Performance
- Establish Weld Acceptance Criteria
Connection Performance
- Assess and Improve Finite Element/Fracture Models for Unreinforced and Cover Plated Connection Details
- Assess and Improve Finite Element/Fracture Models for Various Connection Configurations and Types
- Develop Analytically-Based Design Methods for Different Connections Configurations
- Development and Evaluation of Analytical Tools for Benchmark and Analytical Investigations
System Performance
- Develop Suites of Ground Motions
- Parametric Study on the Effect of Seismic Demands of Structural Configurations, Proportioning and Modeling
- Parametric Study on the Effect of Seismic Demands of Deterioration of Hysteretic Characteristics
- Parametric Study on the Effects on Seismic Demands of Ground Motion Intensity and Dynamic Charateristics
- Investigation of the Effect of Connection Fractures on Safety and Reliability of Steel Moment Resisting Frame Systems
- Investigation of Alternative Framing Systems
Performance, Prediction and Evaluation
- Develop a Statistical and Reliability Framework for Comparing and Evaluation Predictive Models for Evaluation and Design
- Develop Predictive Elastic Models for Building Performance
- Develop Predictive Inelastic Models for Building Performance
- Develop Recommended Procedures for Performance and Evaluation of SMRF Buildings
- Develop Design Requirements for Ordinary and Intermediate (Low Ductility) Moment Frames
