Conceptual Master Plan - Emeryville Center of Community Life

CONCEPTUAL DESIGN January 9, 2009
Emeryville Center of Community Life
STRUCTURAL NARRATIVE
1. General
This structural narrative is prepared for the proposed Emeryville Center for Community Life
project located off of San Pablo Avenue in Emeryville, California. The project consists of seven
building structures on the existing site. Of the seven structures, five will be new buildings, one
will be a single story underground parking structure, and one will be the renovation of the
existing gymnasium building. The new building structures will typically be constructed of
structural steel and will be founded at grade on shallow spread footings. Due to the school
component of the project, the structural design will follow the requirements of the Division of the
State Architect (DSA). The attached site plan, S-1, locates the building structures on site.
Following the site plan are three sheets of axonometric views of the new buildings shown on
sheets S-2 through S-4 and then foundation, floor and roof framing level plans shown on sheets
S-4 through S-16.
2. Building No. 1: K-6 Neighborhood
The K-6 Neighborhood structure is a two story building structure of approximately 67,000-gsf.
The ground floor and second floor will consist of classrooms and lab rooms. The roof structure
will be designed to support an outdoor playground/terrace area and a seating area. Due to the
exposed roof structure, a secondary topping slab and waterproofing system will be required to
support the serviceability requirements. The building's footprint is approximately 80’ in width by
215’ in length with a configuration of three bays in width by seven bays in length. This layout
creates two typical classroom framing bays on either side of the main hallway spine which both
will be approximately 32’ x 30’ in length and the main hallway spine will be 14' x 30' in length.
The gravity framing system for the roof and second floor would of 3-1/4" light weight concrete
fill over 3" – 18 gage composite metal floor deck over W18 beams at 10'-0" on center spanning
to W24 girders. The exterior girders around the perimeter would be W24’s at each level.
Typical steel columns which are not part of the lateral system will be W10x49. For estimating
purposes, 8 psf of steel framing may be used to account for roof and floor beams, girders and
columns.
The lateral framing system in the transverse and longitudinal directions will consist of either
eccentric braced frames or buckling restrained braced frames. Four bays of bracing will be
required in each direction and for estimating purposes, 6 psf of steel framing may be used to
account for braces, columns, beams and gusset plate connections.
In addition, this building will be designed to accommodate a future vertical expansion.
Typically, the perimeter columns would extend approximately 4’-0” above the roof framing level.
At the time of expansion, new column extensions would be erected, then perimeter framing
members which would be followed by steel trusses which would span the building’s width.
Metal roof decking would be erected at the same time the next levels of braced frames were
being installed. Upon completion of the steel erection, fit-up and bolting and welding, the
perimeter light metal stud wall framing would be put in-place. Exterior metal studs would be 6”
Outline Specifications- 11