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1.0 Introduction
Seismic Evaluation - Building 341, Lawrence Livermore National Laboratory
Executive Summary
The Seismic Evaluation of Building 341 located at Lawrence Livermore National Laboratory in
Livermore, California has been completed. The subject building consists of a main building,
Increment 1, and two smaller additions; Increments 2 and 3.
Increment 1, constructed in 1963, is a one-story steel framed structure with a partial mezzanine,
concrete shear walls and exterior precast concrete panels. The building is rectangular in plan
with plan dimensions of approximately 180 feet in the North-South direction and 140 feet in the
East-West direction. Overall building height varies between 22 feet at the low roof and 32 feet at
the high roof.
Increment 2, constructed in 1973, is a one-story steel framed building with exterior precast
concrete tilt-up panels. Increment 2 is located on the West elevation of Increment 1 and the east
wall of Increment 2 is created by the West wall of Increment 1. There is a two-inch separation
between the two structures. The building is rectangular in plan with overall dimensions of 102
feet in the North-South direction and 25 feet in the East-West direction. Building height is
approximately 20 feet.
Increment 3, constructed in 1975, is a one-story concrete and wood framed structure. Increment
3 is located on the North elevation of Increment 1 and the south wall of Increment 3 is created by
the North wall of Increment 1. Furthermore, a portion of the Increment 3 roof is supported
directly by the precast panels on the North elevation of Increment 1. The building is rectangular
in plan with overall dimensions of 39 feet in the North-South direction and 76 feet in the East-
West direction. Building height is approximately 12 feet.
Tier 1 seismic evaluations of Increments 2 and 3 and a Tier 3 seismic evaluation of Increment 1
were conducted in accordance with ASCE 41-13, with a seismic performance goal of Life
Safety, which is in agreement with Performance Category 1 (PC-1) as defined in Department of
Energy Standard 1021-1993.
Based on our evaluation the building does not meet a Life Safety performance level for the BSE-
lE earthquake ground shaking hazard. The BSE-1E is the recommended seismic hazard level
for evaluation of existing structures and is based on a 20% probability of exceedence in 50 years.
Our evaluation identified the following key deficiencies:
Increment 1
" Precast panel to panel connection on lines 4, A and K along the vertical joint are
overstressed.
" The roof diaphragm at the high roof along lines E and K is overstressed in shear.
" There is a lack of a collector connection between the low roof framing and the concrete
shear walls on lines C and E. There are significant loads that need to be dragged to these
walls, yet there is no direct connection.
A Degenkolb Engineers 1 Detailed Seismic Evaluation
December 20, 2013
P:\project.B03\189\B3189012.00\Reports\Final Report\131220rpt LLNL B341 Seismic Evaluation Final Report doc
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Halle, J. B341 Seismic Evaluation, report, January 2, 2014; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc870882/m1/6/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.