Seismic Assessment of Structural and Nonstructural Element in Building

0
This report documents a seismic structural and nonstructural assessment of City of Salem Central Library, which includes the main library building, the auditorium, and the adjacent parking garage. This report indicates descriptions, evaluations, and upgrade recommendations. 
The evaluations were performed in accordance with the checklists produced by the American Society of Civil Engineers (ASCE) in ASCE 31-03 Seismic Evaluation of Existing Buildings. This report is based on an ASCE 31-03 Tier 1 evaluation. Structural upgrades are based in part on the analysis procedures of ASCE 41-06 Seismic Rehabilitation of Existing Buildings. Before implementation of any seismic upgrade scheme, a complete ASCE 31-03 Tier 2 evaluation should be performed.
Three major components were considered in this seismic evaluation: the Library, the Auditorium, and the Parking Garage. While the Library and the Parking Garage require major seismic upgrades the Auditorium requires better out-of-plane attachments for the walls. The seismic upgrade for each component, along with the type of work involved, can be summarized as follows.

• Auditorium: estimated cost $75,000
− Reinforce anchorage of the roof to the concrete walls.
• Library: estimated cost $5.224 million
− Add new reinforced concrete shearwalls at four locations.
− Add new micro-pile foundations to support the new concrete shearwalls.
− Add collector elements at elevated levels in order to get seismic load to the new concrete shearwalls.
− Reinforce the connections of elevated levels to existing concrete walls and piers.
− Reinforce the connection of the composite metal deck to existing concrete waffle slabs and concrete walls.
− Reinforce the connection of the metal roof deck to existing concrete waffle slabs and concrete walls.
− Reinforce the connections of precast concrete spandrel beams to the structure.

• The Parking Garage: estimated cost $1.098 million
− Add new reinforced concrete shearwalls.
− Add collector elements at elevated levels in order to get seismic load to the new and existing concrete shearwalls.
− Reinforce the connections of precast concrete spandrel beams to the structure.
The costs listed above are direct construction costs only. See Appendix B, Direct Construction Cost Summary for a list of other cost categories to be included when considering the total project development cost. Construction of these upgrades will likely disrupt the daily function of the facility and could make portions of each facility off-limits during construction. 
Download
Code

Seismic Assessment of Structural and Nonstructural Element in Building
Become a 
VIP Member to see this content