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NEESR: Near Collapse Performance of Existing Reinforced Concrete Frame Buildings


Real-Time Hybrid Simulation with Online Model Updating



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NEESsoft: Seismic Risk Reduction for Soft-Story Woodframe Buildings


US-China Distributed Test


Cyclic Testing of two HGA10 connectors for CLT panels


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NEESR: Near Collapse Performance of Existing Reinforced Concrete Frame Buildings





Project Duration: 01/2012~12/2014 Description: This project utilizes the unique hybrid simulation capability provided by the NEES facilities to integrate the physical experiments on four sets of three columns of four buildings and the numerical simulation of the remaining reinforced concrete frame structure. The goals of the project are to determine the effects and important characteristics of triaxial as opposed to unidirectional 
Funding Agency: National Science Foundation
Research Assistant: Adam Mueller
Principal Investigator:

Mehrdad Sasani, Ph.D. 

Northeastern University

Co-Principal Investigators:

Xiaoyun Shao, Ph.D.

Western Michigan University

seismic ground motions on column failure and collapse mechanisms, to develop reliable analytical modeling tools and methods for collapse analysis and to develop system level acceptance criteria and procedures for collapse analysis of reinforced concrete structures.

Column shear-axial failure in existing vulnerable reinforced concrete (RC) frame buildings constructed before the mid 1970's is a major seismic risk. The challenges associated with spatial response and system load redistribution capability at the onset of collapse has not been resolved yet. The acceptance criteria in current seismic rehabilitation provisions are defined at the element level with no due consideration for the system robustness. Four sets of three-dimensional, geographically distributed hybrid simulations (HS) will be conducted using the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) facility at the University of Illinois at Urbana-Champaign to obtain the response up to collapse of a representative three-dimensional structural system subjected to one-directional and tri-axial seismic ground motions. This research will investigate, characterize, model, and derive practical procedures for the consequences of column shear-axial failure on the collapse of existing vulnerable RC structures. The project will develop system-level acceptance criteria and analytical tools for near collapse seismic performance of existing non-ductile RC frame structures. Data from this project will be archived and made available to the public through the NEES Project Warehouse/data repository at http://www.nees.org. This project is a collaborative effort between researchers from Northeastern University and Western Michigan University.


This project utilizes the unique HS capability provided by the NEES facility to simulate near collapse response of existing vulnerable RC buildings through the integration of large scale physical experiments and numerical models. If successful, this research project will shift the philosophy of structural assessment of vulnerable buildings from component-level to system-level evaluation. The application of system-level evaluation methods developed in this project can lead to more efficient and cost-effective rehabilitation methods for existing non-ductile RC buildings against collapse by identifying and prioritizing buildings susceptible to partial/total collapse. Thus, optimal use of limited resources can be made. A multi-level education and outreach program will provide students from K-12, college, and underrepresented groups, as well as high school physics teachers, with the opportunity to participate in project activities. This will include development of three teaching modules suitable for elementary, middle, and high school students covering the basics of earthquake engineering and topics relevant to collapse analysis. This award is part of the National Earthquake Hazards Reduction Program (NEHRP).


Western Michigan University ---- Department of Civil and Construction Engineering

Laboratory of Earthquake and Structural Simulation ---- Last Updated: 12-3-2014