Proposed Accessory Dwelling Unit (ADU)
Project Details
This project involves the structural design and engineering of a cold-formed steel and alumninum-framed Accessory Dwelling Unit (ADU) measuring approximately 45′-9″x17′-0″ with a height to eaves of 14.89′. The comprehensive scope required modern engineering solutions for a modular assembly utilizing high-strength 6061-T6 aluminum alloy and structural steel vertical standards, including specialized components like lattice trusses, ledgers, and bridging systems. The design process included a rigorous structural analysis using finite element modeling to ensure the unit could safely withstand various environmental load cases, including dead, live, and extreme wind loads. The structural elements were engineered in accordance with IBC 2021, ASCE 7-16, ACI 318-19, AISC 360-16, and the Bahamas Building Code. Special attention was given to lateral stability and uplift resistance, with the unit designed to withstand extreme wind speeds of 185 MPH and exposure category D conditions. The foundation system features a combination of independent reinforced concrete pad footings, pedestals, and strip wall footings designed to perform reliably under a soil bearing capacity of 1,500 psf.
Role
Structural Engineer/Designer
Services Provided
The scope of services included the preparation of structural calculations and structural drawings for the proposed structure. Structural calculations considered loading analyses for wind, seismic, dead, and live loads in accordance with the applicable building codes and project requirements. The work involved the structural analysis and design of all primary structural components, including foundations, columns, beams, braces, rafters, and other framing members, to verify adequate strength, stability, and load transfer throughout the structure. The services also included the preparation of structural drawings consisting of foundation plans, floor framing plans, roof framing plans, and framing elevations per gridline. Structural details, general notes, and specifications were incorporated into the drawings to clearly communicate the design intent, member requirements, and construction criteria for coordination and implementation.