NEHRP Clearinghouse
- Title
- Development of Seismic Strengthening and Retrofit Strategies for Critical Facilities Using Engineered Cementitious Composite Materials.
- File
- PB2006111701.pdf
- Author(s)
- Kesner, K.; Billington, S. L.
- Source
- National Science Foundation, Washington, DC., cAugust 29, 2005, 234 p.
- Identifying Number(s)
- MCEER-05-0007
- Abstract
- The research presented herein describes the development of a seismic retrofit system for critical facilities that uses engineered cementitious composite (ECC) materials in lieu of traditional materials. Specifically an infill panel system was developed that utilizes the pseudo-strain hardening properties of the ECC materials. The research consisted of a combination of laboratory and numerical studies. The infill panel system, which consists of precast ECC panels with bolted connections, was developed for use as a retrofit strategy in critical facilities. Based upon finite-element simulations, a beam-type infill system was found to be effective in increasing the strength, stiffness and energy dissipation of a steel frame without yielding of the bare frame at drift levels up to 0.75%. Structural-scale laboratory tests were used to test the strength of the proposed bolted connections between panel members, and to evaluate the response of ECC infill panels made with various ECC materials, reinforcements and panel geometries. The connection tests results showed the viability of the pretensioned bolted connections. The panel test results indicated the different levels of panel strength, stiffness and energy dissipation that can be achieved. These results serve as benchmark studies for further development of the infill system. To examine the infill panel concept further, additional simulations were performed using a material model for the ECC developed from reversed cyclic tests. The simulations demonstrated the ability of the proposed ECC infill system to strengthen, stiffen and increase the energy dissipation of steel frames, without causing damage in the frames.
- Keywords
- Panel geometries; Multidisciplinary Center for Earthquake Engineering Research (MCEER); Finite-element simulations; Seismic retrofit system; Laboratory tests; Critical facilities; Energy dissipation; Strength; Stiffness; Connection tests; Steel frames; Infill panel system; Cementitious composite; Engineered Cementitious Composite (ECC)