Attachment 13 - Structural Narrative.pdf
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- Solicitation number
- 36C77624R0041
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This document is a narrative describing structural changes made to the 100% construction document plans for the Relocation & Renovation of SPS West Haven project. The key details are:
The largest change was the addition of a new retaining wall to replace the existing retaining wall holding back soils, vehicle traffic, and utilities where the existing cardiology wing is located. The 65% plans included a 10-inch thick structural slab foundation supported by concrete grade beams and piers, but this was changed to mitigate the significant grade change on the site. The steel framing was further developed, particularly at the stair tower, and a 2-hour fire separation and expansion joint were added between the existing building and the addition. A 5-inch slab-on-deck was added to the roof to maintain the 2-hour separation. The path of the existing underground electrical duct bank was further defined and the foundation plan was designed to maintain it.
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Narrative - 100% CDs SMRT Architects and Engineers 877.700.7678 smrtinc.com
To Peter Sandor Date 06/21/23
From Brian Steele, PE Project No. 689-408
Subject Structural changes Project Name Relocation & Renovation of SPS West Haven
Structural Drawings – Narrative Description of Changes
1. The largest change from 65% to 100% was the was the addition of a new retaining wall to replace the existing retaining wall holding back the soils, vehicle traffic and utilities where the existing cardiology wing is located. The construction of the existing retaining wall is unknown so the structural integrity of the wall cannot be calculated.
2. The 65% foundation plan included a 10” thick structural slab for most of the area, with a slab on grade in the remaining areas. The structural slab was supported by concrete grade beams supported by concrete piers and spread footings. The footings were located low enough to not overstress the existing retaining wall and retaining wall footing (both unknown). This mimics the foundation layout of the existing cardiology wing.
3. One of the big issues with the grade beams and structural slab plan was the grade change is significant enough on the building site to require a much larger than needed grade beam to maintain frost protection.
4. The steel framing of the building addition did not change significantly from 65% to 100% but was developed further. Architectural wall sections were further developed at the stair tower location which required a complicated framing plan.
5. The need to maintain a 2 hour fire separation between the existing building and the addition, combined with the need for an expansion joint between the existing and the additions, was further developed after the 65% submission and added cost to the project.
6. The 65% only had a regular 1 ½ roof deck but for 100% a 5” slab on deck was added to the project to create a 2 hour separation from the existing building.
7. The path of the existing under ground electrical duct bank was further defined by the site investigations that came with the geotechnical report, which came after the 65% set. The 95% foundation is designed to maintain that duct bank without moving or creating any new forces on the encasement.
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