S02. Basis of Design Narrative - 757-24-207 - Parking Garage Tendon Repair - 6 Jan 2025 Combined.pdf

WEST POINT ENGINEERS

10% Basis of Design Narrative

Parking Garage Tendon Repair

Chalmers P. Wylie VAMC

Columbus, Ohio

BLDG 7 Roof

Project 518-22-109

35% Schematic Design Submission February 28, 2029

Columbus VAMC Design Narrative VA Project 757-24-204 10% Basis of Design Parking Garage Tendon Repair 6 January 6, 2025

Applicable Codes and Standards:

CODES:

INTERNATIONAL BUILDING CODE – 2021 EDITION

STANDARDS:

DEPARTMENT OF VETERANS AFFAIRS - VA DIRECTIVES, DESIGN MANUALS,

MASTER SPECIFICATIONS

o PG-18-1 Master Construction Specifications o PG-18-3 Design and Construction Procedures o PG-18-4 National CAD Standards & Detail o PG-18-5 Equipment Guide List o PG-18-9 Space Planning Criteria o PG-18-10 Design Manuals (by discipline) [Including but not limited to:

Guiding Principles checklists as indicated for Minor Projects in Sustainable Design Manual, Life Cycle Cost Analysis] o PG-18-12 Design Guides (graphical, by function) o PG-18-13 Barrier Free Design Guides o PG-18-14 Room Finishes, Door, and Hardware Schedules o PG-18-15 Minimum Requirements for A/E Submissions o PG-18-17 Environmental Compliance Manual o H-7545 VA Cultural Resource Management Procedures o Manual for Preparation of Cost Estimates o Applicable VA Energy Conservation & Sustainability Program requirements o Preparation and Issuance of Construction Solicitation Contract Documents

Manual

ACI 305R Hot Weather Concreting ACI 306R Cold Weather Concreting ACI 308 Standard Practice for Curing Concrete ACI 318 Building Code Requirements for Reinforced Concrete ASTM A775 Specification for Epoxy-Coated Reinforcing Steel Bars ASTM C31 Standard Method for Making and Curing Concrete Test

Specimens in the Field ASTM C33 Standard Specification for Concrete Aggregates ASTM C94 Standard Specification for Ready Mixed Concrete ASTM C494 Standard Specification for Chemical Admixtures for Concrete ASTM 1202 Standard Test Method for Electrical Indication of Concrete’s Ability to Resist Chloride Ion Penetration PTI Specifications for Unbonded Single Strand Tendons

PTI DC 80.3 Guide for Evaluation and Repair of Unbonded Post-Tensioned Concrete Structures.

MANUAL OF STEEL CONSTRUCTION, LOAD AND RESISTANCE FACTOR

DESIGN SPECIFICATIONS FOR STRUCTURAL STEEL BUILDING, AMERICAN

INSTITUTE OF STEEL CONSTRUCTION (AISC)

THE PROVISIONS FOR CONSTRUCTION AND SAFETY SIGNS STATED IN THE

GENERAL REQUIREMENTS SECTION OF THE SPECIFICATIONS

Basis of Design Narrative

Overview

The project area consists of the evaluation and recommended repair of a damaged parking garage tendon.

Per the contract, the SOW includes (but is not limited to) the following areas:

1. STATEMENT OF WORK:

A/E Part One Services:

includes site visits, field investigation, conduct of studies and user interviews to prepare drawings, specifications, and cost estimates for all facets of work and disciplines/trades to facilitate a construction project to repair the existing damaged parking garage tendons. The project shall include, but is not limited to:

Provide a recommended design necessary to repair the existing damaged parking garage concrete beam and tendons and restore the garage to its pre-damaged condition, Provide construction drawings and specifications, and

Provide a construction cost estimate for completing the repair work.

A/E Part Two Services:

responding to construction contractor Requests for Information (RFls) during the solicitation and construction phases of the construction project, attendance at pre-bid, post-award and all kick off construction project conferences, review of construction material submittals and shop drawings, approximately six (6) in-person site visits during construction (both scheduled and emergent) to ensure compliance with the design drawings and specifications, preparation of site visit reports, coordination with project commissioning requirements, review of any construction project modifications for cost and technical acceptability, attendance in the final acceptance inspection, preparation of the punch list and preparation of record drawings of the completed construction project based on the construction contractor's as-built drawings.

The above paragraphs constitute a basic outline of the work to be accomplished and in no way comprise all the details for the design of this project. The A/E shall initiate detailed inspection of the project site to determine the needs and conditions for the design of this project. Copies of Columbus VAMC record drawings will be made available for A/E use; the A/E will verify the validity of the record drawings prior to the start of design work and conduct site investigations as necessary throughout the design.

The A/E shall be solely responsible for the management, including all associated labor, equipment, materials, mailing costs, and inspection, to meet the requirements of the design project. The A/E shall further provide meeting minutes for all meetings held under this design project.

2. Design Philosophy

The attached document addresses the details of the Design Basis, based on the investigations by Walker Consultants. This philosophy will be incorporated into the next design phase (35% schematic design).

END OF 10% BASIS OF DESIGN NARRATIVE

6602 E. 75th Street, Suite 210 Indianapolis, IN 46250

317.842.6890

Basis of Design

Background and Understanding

The Columbus VA Hospital Parking Structure is a three level, two bay, cast-in-place post tensioned (PT) parking structure with an express ramp and parking for approximately 360 cars. The structural framing system consists of cast-in-place PT concrete slabs and beams, and conventionally reinforced concrete columns and façade walls.

Vehicular access is provided on the west elevation on the first level by an express ramp that is located to the north of the structure. Parking throughout the structure is 90-degree parking. Pedestrian access is provided by two stair towers at the south-east and south-west corners of the structure.

We understand that the VA has identified one beam at the north-east corner of the top level of the structure to have PT tendons that have likely failed. During a recent project walk through, Walker noted that at the exterior end of this beam a total of four grout pockets were missing with the PT tendon tails protruding out. Additionally, at the expansion joint location, three grout pockets were in similar condition with PT tendon tails protruding.

Based on these visual indicators we understand there is failure of the PT tendons within the beam. Additional testing has been conducted based on these observations to evaluate the remaining tendons of the beam. From this testing, Walker found that three total full length beam tendons have been broken in the beam along with one additional add tendon for the last two spans of the beam. We have provided photographic observations in our attached photo log. This information will inform our design for repair moving forward.

General Repair Approach

The repair of the PT beam will entail the following general procedure:

1. Chipping isolated concrete openings in the beam at strategic locations.

2. Removal of damaged PT tendons.

3. Replacement of the damaged tendon with new PT tendon from the end of the beam to the chipped location.

4. Coupling the new tendon to the existing tendon within the beam.

5. Restressing the tendons from the exterior of the structure.

6. Placing repair concrete at the isolated chipped openings.

References

WPE and Walker will utilize the following references for the design of this repair:

1. ACI 305R Hot Weather Concreting

2. ACI 306R Cold Weather Concreting

3. ACI 308 Standard Practice for Curing Concrete

4. ACI 318 Building Code Requirements for Reinforced Concrete

5. ASTM A775 Specification for Epoxy-Coated Reinforcing Steel Bars

6. ASTM C31 Standard Method for Making and Curing Concrete Test Specimens in the Field

7. ASTM C33 Standard Specification for Concrete Aggregates

8. ASTM C94 Standard Specification for Ready Mixed Concrete

9. ASTM C494 Standard Specification for Chemical Admixtures for Concrete

10. ASTM 1202 Standard Test Method for Electrical Indication of Concrete’s Ability to Resist Chloride Ion

Penetration

11. PTI Specifications for Unbonded Single Strand Tendons

12. PTI DC 80.3 Guide for Evaluation and Repair of Unbonded Post-Tensioned Concrete Structures.

13. Internation Building Code

Photo Log Photo 1. Overall of PT beam tendon test location

Photo 2. Close up of PT beam tendon test location with observed anchors inline with PT tendon bundle.

Photo 3. Nondestructive testing of PT beam tendon, failed.

Photo 4. Nondestructive testing of PT beam tendon, failed.