Proposed New Single-Family Residence

Project Details

This project involves the comprehensive structural design and analysis of a multi-segment proposed single-family dwelling. The engineering scope required modern solutions for the entire structural assembly, including cold-formed steel (CFS) framing for walls, floor joists, ceiling panels, and specialized roof trusses. The primary structure utilizes high-strength steel members, such as 600S200-43-50 distributed studs and boundary studs, integrated with structural steel beams (W-sections) and columns (HSS) to support complex architectural spans and a mezzanine level. The design process included a rigorous structural analysis using finite element modeling to ensure the residence could safely withstand environmental loads. All structural elements were engineered in accordance with the International Building Code (IBC 2021), ASCE 7-16, and the 2022 California Building Code (CBC). Special attention was given to lateral load resistance, with the system designed for a basic wind speed of 96 MPH (Exposure C) and the high seismic demands of Seismic Design Category D. Lateral stability is provided by light-frame wall systems using flat strap bracing and CFS hold-down anchors including S/HDU6 and S/HDU11. The foundation system features a combination of independent reinforced concrete footings (WF1–WF5 and PF1–PF8) and reinforced concrete basement retaining walls (RW1 and RW2). These components were specifically designed to perform reliably under a soil bearing capacity of 2,800 psf, with concrete specifications requiring a minimum compressive strength of 2,500 to 4,500 psi depending on the specific element. Provisions were also made for sustainable construction, requiring a minimum of 65 percent recycling or salvage of nonhazardous construction waste in accordance with CalGreen standards.

Role

Structural Engineer/Designer

Services Provided

The scope of services included the preparation of comprehensive structural calculations and structural drawings for the proposed structure in accordance with applicable building codes and project requirements. Structural calculations included complete loading analyses for wind, seismic, dead, and live loads to determine the governing design forces acting on the structure. The work encompassed the structural analysis and design calculations for all primary structural components, including roof rafters with roof diaphragm sheathings; shear walls including stud sizes and spacing, wall sheathings, and nailing requirements; floor joists with subfloor diaphragm sheathings; and load-bearing walls including stud sizes and spacing. The analysis also included the design of beam supports required for large open spaces, utilizing either wood beams or steel beams depending on the structural loading demands. In addition, calculations included shear wall lintel beams and headers supporting wall openings such as doors and windows, as well as the design of the concrete slab-on-grade system. Foundation design included wall footings supporting all shear walls and load-bearing walls, and pad footings supporting columns carrying beam loads, ensuring proper load transfer to the supporting soil. Structural drawings were prepared to clearly communicate the structural design for permitting, coordination, and construction. The drawing set included a Foundation Plan identifying the layout and dimensions of all footings and foundation elements; Floor Framing Plans for both the first and second floors showing framing layout, member sizes, and structural connections; and a Roof Framing Plan indicating rafters, beams, and diaphragm components. Shear wall layout plans were provided for both the first and second floors to illustrate the location and configuration of the lateral force-resisting system. The drawings also included a structural building section view to clarify vertical load paths and framing relationships, along with typical structural details, retaining wall section details (if applicable), and general structural notes and specifications necessary to guide proper construction and ensure compliance with applicable codes and engineering standards.