Jarvinen M.,Simpson Strong Tie
Concrete (London) | Year: 2011
Wilson Consulting Group, an engineering firm from Mechanicsburg, Pennsylvania, the US, worked with Simpson Strong-Tie Anchor Systems in 2010 to discuss the potential of using the company's post-installed anchor products, along with temporary shoring applications for the 4th Street Bridge Rehabilitation Project in Allentown. Wilson Consulting Group was awarded a contract by Bill Anskis Company of Elysburg, Pennsylvania, to provide temporary shoring designs for replacing the bridge bearings. A significant portion of the shoring design involved anchoring large fabricated structural steel corbels with eccentric steel stanchions to the existing reinforced, normal-weight, cast-in-place concrete abutments and pier columns with multiple threaded rod anchors bonded to the concrete with an anchoring adhesive. This design method was implemented while several different methods of temporary shoring were used during the project.
Simpson Strong Tie | Date: 2013-01-22
Pryor S.E.,Simpson Strong Tie |
Murray T.M.,Virginia Polytechnic Institute and State University
ISEC 2013 - 7th International Structural Engineering and Construction Conference: New Developments in Structural Engineering and Construction | Year: 2013
Partial strength steel moment frame connections have been used successfully for many years in the United States. Traditionally used in wind-resistant designs, their use in seismic applications has been limited. In the United States, partial strength moment connections are currently only allowed for low ductility demand Ordinary Moment Frame systems per the governing code, ANSI/AISC 341-10. Created with a focus on wood construction and enhanced structural resiliency, Simpson Strong-Tie has developed a proprietary new type of partial strength moment connection specifically for high seismic or high ductility demand environments such as those found in the western U.S (U.S. Patent No. 8,001,734 B2). Currently under review by the AISC Connection Prequalification Review Panel for inclusion in ANSI/AISC 358, the connection would become the first partial strength steel moment frame connection to be qualified for use in Special Moment Frame systems. Merging a number of different technologies, the field-bolted moment connections focus seismic energy dissipation into replaceable structural fuses, facilitating resilience and rapid recovery after a seismic event. The connection shows promise for not only new construction, but retrofit applications as well. Copyright © 2013 by Research Publishing Services.
Bahmani P.,Colorado State University |
Van De Lindt J.W.,Colorado State University |
Mochizuki G.L.,Simpson Strong Tie |
Gershfeld M.,California State Polytechnic University, Pomona |
Pryor S.E.,Simpson Strong Tie
Journal of Architectural Engineering | Year: 2014
In the San Francisco Bay Area and throughout much of California, there are a large number of wood-frame buildings with garage space at ground level, resulting in open fronts on one or two sides. This type of geometry results in a soft and weak first story, and buildings of this archetype are generally referred to as soft-story buildings. During an earthquake, these buildings are susceptible to severe damage and collapse and have been recognized as a disaster-preparedness problem. The five-university Network for Earthquake Engineering Simulation (NEES)-Soft project culminated in a series of full-scale soft-story wood-frame building tests to validate two different retrofit philosophies and included a 2-month test program encompassing four different retrofits. The building had 370∈m2 of living space and was designed to be generally representative of older San Francisco Marina and Mission District construction, circa 1950s. Following the retrofit testing, which only moderately damaged the test building, retrofits were removed, repairs were conducted, and the building was nominally instrumented for testing without retrofits in place. A series of unidirectional shake table tests was conducted, beginning with the Cape Mendocino acceleration record scaled to 0.4g spectral acceleration up to two successive shakes with the Superstition Hills acceleration record scaled to 1.8g spectral acceleration. Little residual lateral displacement was observed until the last two earthquakes. The objectives of the collapse testing phase of the NEES-Soft project were to (1) observe and document the nature of the soft-story collapse mechanism and (2) quantify the collapse drift for these types of soft-story wood-frame buildings. The building collapsed at approximately 19% interstory drift of the soft story (ground floor). © 2014 American Society of Civil Engineers.
Pang W.,Clemson University |
Ziaei E.,Clemson University |
Jennings E.,Colorado State University |
Shao X.,Western Michigan University |
And 3 more authors.
WCTE 2014 - World Conference on Timber Engineering, Proceedings | Year: 2014
Hybrid simulation is gaining acceptance in earthquake engineering and research community as a cost effective means to test the seismic performance of subassemblies in a structural system or building. This paper presents a numerical model and simulation framework developed for hybrid testing of a three-story wood-frame building with weak-first story. In this hybrid simulation, the upper stories (i.e. stories 2 and 3) are physical substructures while the effects of different retrofits are applied to the first story and modelled numerically. The retrofits considered in this hybrid simulation includes inverted moment frame (IMF), distributed knee-brace (DKB), steel moment frame (SMF) and shape memory alloy (SMA). Hybrid simulations of CLT, SMF and DKB retrofits were completed. The IMF retrofit is currently being tested while the SMA retrofit is scheduled to be conducted in September and October. The on-going hybrid test demonstrates that slow hybrid simulation is a viable experimental method to evaluate the effectiveness of different retrofits for soft-story wood-frame buildings.