Eighth Congress on Forensic Engineering
Impact of Adjacent Construction on Existing Building
Publication: Forensic Engineering 2018: Forging Forensic Frontiers
ABSTRACT
This paper presents a case study of a two-story unreinforced brick masonry building that was adversely impacted by construction activity associated with the development of an adjacent high-rise building. One longitudinal exterior wall of the URM building was located along the property line where the construction activity for the new building occurred. The new construction extended several levels below grade requiring support of excavation along the property line. The excavation was shored with a system of soldier beams cast in drilled shafts, raker beams, and lagging that also served as the formwork for the basement retaining walls of the new structure. However, the excavation activity disturbed the equilibrium of the URM building and caused settlement of its longitudinal exterior wall foundation, which resulted in cracking of the exterior walls, settlement of the floor slab-on-grade, and other distress to the URM building. The potential for damage to the URM building was mitigated to some extent because of a prior seismic retrofit, which tied the second floor and roof diaphragms to the building walls. Photographs taken during a pre-construction survey of the URM building confirmed that cracking of the URM building occurred after commencement of adjacent construction. Details of the investigation performed to determine the cause of distress to the URM building are described in this paper. The intensity of vibrations induced by shaft drilling and their attenuation with distance was also assessed through a desktop study to complement the findings. The measures adopted to remediate damage to the URM building with the added constraint of adjacent construction are also discussed in this paper.
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REFERENCES
1.
California Department of Transportation, Division of Environmental Analysis Environmental Engineering, Hazardous Waste, Air, Noise, Paleontology Office Transportation and Construction Vibration Guidance Manual, Sacramento, CA, September 2013
2.
Federal Transit Administration Office of Planning and Environment, Transit Noise and Vibration Impact Assessment, Washington DC, May 2006
3.
International Building Code, 2015 Edition
4.
The City New York Building Code, 2014 edition
5.
The City New York Department of Building, Technical Policy and Procedure Notice #10/88, June 6, 1988
6.
The City of Los Angeles Building Code, 2016 Edition
Information & Authors
Information
Published In
Forensic Engineering 2018: Forging Forensic Frontiers
Pages: 149 - 161
Editors: Rui Liu, Ph.D., Kent State University, Michael P. Lester, Element Analytical, Alicia E. Díaz de León, and Michael J. Drerup
ISBN (Online): 978-0-7844-8201-8
Copyright
© 2018 American Society of Civil Engineers.
History
Published online: Nov 27, 2018
Published in print: Nov 27, 2018
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