Duvall Main St. Reconstruction, City of Duvall
CivilTech provided structural design for three retaining walls (Walls A, D and E) and four decorative banner poles along Duvall’s Main Street. Wall A is an 18-inch thick CIP concrete retaining wall supporting a decorative metal trellis on top. Design of the trellis included checks for seismic, wind, and snow loads; flange and web local buckling; deflection; and design of arm support, horizontal pipe supports, and columns. Walls D and E are a CIP concrete wall and rockery wall, respectively. CivilTech prepared PS&E documents and provided construction support services. All walls were designed in accordance with AASHTO LRFD Bridge Design Specifications and local area guidelines, taking into consideration necessary grade changes for ADA accessibility.