Proposal Revision

    A solution to the integration concern between the floor gravity system and the mechanical and electrical components is to use a joist system for the floor. Joists allow for ductwork and conduit to pass through the depth of the floor structure. This would be done in order to maximize space utilization and integration between floors. This should allow for the acoustic ceiling grid to be hung slightly higher, providing a more open workspace.

The gravity system will be modeled using the two typical bay sizes of 35’ x 42’ and 35’ x 28’ to determine if additional girders to control the depth of the joists. With the intention of raising the acoustic ceiling grid, controlling the depth of the joists is critical. The column layout is planned to remain the same as the existing structure but column sizes and strength will be analyzed and modified as necessary.

The lateral system will be changed to concentrically braced frames to increase stiffness. This increased stiffness will be used to help convert some of the two bay braced frames into one bay in order to decrease material and construction costs. Individual bays will be analyzed using RISA to compare structural effectiveness and full height frames will be analyzed in ETABS to determine overall drifts and deflections. The choice to use concentrically braced frames has aesthetic reasoning as well that is detailed in the architecture breadth.

GREEN ROOF
It is proposed that a green roof be added to the western side of the building. A vacant plot measuring 84’ x 70’ is currently unoccupied by any rooftop equipment and is an ideal location for a green roof. Structural concerns such as additional rooftop and column loading will be explored with needed accommodations presented. Logistics such as drainage, maintenance access, and fall protection will be researched and presented along with practical solutions.

DAYLIGHTING
With the introduction of a new curtain wall system and a much higher amount of daylight entering the space, an analysis will be performed to determine the natural light paths throughout the year and proposed systems to mitigate excess sunlight when necessary. Factors such as glazing type and shading devices, both active and passive, will be discussed. Once all factors influencing natural lighting on Orchard Plaza are researched, an ideal system will be proposed as well as details for integrating relevant systems into the space.