HAL Group Inc. was retained by AECOM, on behalf of the City of Toronto, to conduct a condition survey of the ceremonial ramp at Nathan Phillips Square. The ramp, which connects the plaza level to the podium level, consists of a cast-in-place concrete structure with precast concrete balustrades. The balustrade panels were secured to the ramp with steel brackets at both the top and bottom of the slab.

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STEEL BALUSTRADE CONNECTIONS

The survey focused on the bottom balustrade connections, particularly the embedded steel plates within the precast panels. Findings were documented in tabular format, correlating each connection’s condition with its respective panel. This inspection aimed to assess the structural integrity of these critical connections.

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COMPREHENSIVE CONDITION SURVEY

A detailed condition assessment was performed on various structural elements, including the asphalt deck, concrete curbs, soffit, balustrade panels, end walls, and columns. A scissor lift was utilized to facilitate close-up inspections. Additionally, a concrete cover survey was conducted on the balustrade panels, curbs, soffit, and end wall to evaluate reinforcement coverage.

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SCOPE OF WORK

The project scope encompassed the following tasks:

• Detailed Visual Inspection – A full visual assessment of the ramp and associated structures.

• Concrete Cover Survey – A limited-area cover meter survey to determine reinforcement depth and spacing.

• Delamination Survey – A comprehensive survey of the entire structure, including the ramp and columns.

• Localized Cover Meter Testing – Conducted at four specific locations to evaluate reinforcement near connection points, including a failing balustrade panel, a typical panel, the taller panels at the ramp base, and an elevated walkway around the plaza.

• Balustrade Connection Survey – Focused on the bottom balustrade connections, documenting conditions in a tabular format for analysis.

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This thorough investigation provided valuable insights into the ramp’s structural condition, supporting informed decision-making for future maintenance and repairs.