Doral_PD_HQ_SD_NARRATIVE_Structural_.pdf

City of Doral Police Headquarters

Programing and Schematic Design

Structural Narrative

S ta n te c C o n s u lt in g S e rv ic e s

In c

Prepared for:

City of Doral

Prepared by:

Stantec

Date:

November 19, 2025 Rev1: January 9, 2026

Project/File:

219421076

The conclusions in the Report titled City of Doral Police Headquarters are Stantec’s professional opinion, as of the time of the Report, and concerning the scope described in the Report. The opinions in the document are based on conditions and information existing at the time the scope of work was conducted and do not take into account any subsequent changes. The Report relates solely to the specific project for which Stantec was retained and the stated purpose for which the Report was prepared. The Report is not to be used or relied on for any variation or extension of the project, or for any other project or purpose, and any unauthorized use or reliance is at the recipient’s own risk.

Stantec has assumed all information received from City of Doral (the “Client”) and third parties in the preparation of the Report to be correct. While Stantec has exercised a customary level of judgment or due diligence in the use of such information, Stantec assumes no responsibility for the consequences of any error or omission contained therein.

This Report is intended solely for use by the Client in accordance with Stantec’s contract with the Client.

While the Report may be provided by the Client to applicable authorities having jurisdiction and to other third parties in connection with the project, Stantec disclaims any legal duty based upon warranty, reliance or any other theory to any third party, and will not be liable to such third party for any damages or losses of any kind that may result.

Table of Contents

Project: 219421076 i

Table of Contents

1 Structural

1.1 General

1.2 Design Loads

1.3 Current Project

1.4 Materials

1.0 Structural

1.1 General

The structural design for this project will comply with the following codes and standards:

• Florida Building Code – Building, 2023 Edition (FBC 2023)

• ASCE 7-22, Minimum Design Loads and Associated Criteria for Buildings and Other Structures

• ACI 318-19, Building Code Requirements for Structural Concrete

• TMS 402-22/ACI 530-22, Building Code Requirements for Masonry Structures

• AISC 360-16, Specification for Structural Steel Buildings

All design loads, load combinations, and material strengths will be in accordance with the Florida Building Code and applicable Miami-Dade County HVHZ (High-Velocity Hurricane Zone) requirements.

1.2 Design Loads

Gravity Loads

Level Space / Room Type Live Load

(psf)

Dead Load

(psf)

Notes

Roof Typical roof areas 30 (rain) 15 Excludes equipment and screens.

Level 3

Offices, command, chief’s office, admin 50 25 Add 15 psf partition load for flexibility.

Conference, executive, briefing rooms 100 25 Assembly without fixed seats.

Restrooms and storage 60 25 Includes toilet and janitor rooms.

File/copy rooms with shelving 125 25 Increase if compact shelving is added.

IT/telecom or server rooms 150 25 Add rack loads if heavier.

Level 2 General offices, patrol, detectives, analysts, investigation

50 25 Add 15 psf partition load.

Level 2

Conference, training, roll call, classroom

100 25 Assembly without fixed seats.

Storage or file rooms 125 25 Upgrade to 300 psf for compact shelving.

Evidence or record storage (if present) 300 25 Verify post reactions for high-density shelving.

IT, comms, and real-time operations rooms

150 25 Verify concentrated rack loads.

Restrooms, locker areas 60 25 Includes toilet rooms.

Corridors and circulation 100 25 Major corridors per ASCE 7

Table 4.3-1.

Level 1

Public lobby, reception, waiting 100 20 Assembly use at grade.

Corridors and queuing 100 20 Heavy public circulation.

Offices, admin, interview, conference 50 20 Add 15 psf partition load.

Gym, multipurpose, briefing, community rooms

100 20 Assembly without fixed seats.

Evidence and property storage 125–300 20 Verify compact shelving loads.

High-bay storage and armory 250 20 Check rack post reactions.

Sally port, vehicle storage 40 20 Design for passenger vehicle loading.

Motorcycle garage 40 20 Passenger-type vehicle area.

Level 1

Mechanical, electrical, IT rooms 150 20 Add equipment weights as needed.

Restrooms and locker rooms 60 20 Includes toilet and shower areas.

Loading, package delivery 125 20 Increase if forklift or pallet loading occurs.

Wind Loads

Ultimate Wind Speed Vult = 195 mph

Service Wind Speed Vasd = 151 mph Risk Category IV (3,000 year MRI) Wind Exposure C Internal Pressure Coefficient Gcpi = +/- 0.18 (enclosed)

Mean Roof Height h = 44 ft

1.3 Current Project

Description

The proposed project consists of constructing a new three-level Police Station Headquarters in Doral, Florida. The facility will serve as the primary command and administrative center for the city’s law enforcement operations and will include patrol and investigation units, evidence and property storage, briefing and training rooms, armory, sally port and vehicle storage, and associated support areas. The structure will be designed as an essential facility (Risk Category IV) in accordance with the Florida Building Code 2023 and ASCE 7-22, located within the Miami-Dade County High Velocity Hurricane Zone (HVHZ).

Proposed Superstructure

The proposed three-level police headquarters in Doral will be constructed using a reinforced concrete structural system consisting of cast-in-place concrete columns, concrete girders, and a precast joist floor system. The floor and roof framing will comprise of precast concrete joists spanning between main girders, with a cast-in-place concrete slab placed over removable formwork to create a composite floor system. This configuration provides an efficient and constructible system with enhanced stiffness and vibration control.

Gravity loads will be supported by concrete columns and girders arranged on a regular grid to accommodate architectural planning and circulation. The joist system will span primarily in the east-west direction, transferring loads to the main girders and subsequently to the vertical column lines. Beam and joist depths will be coordinated with mechanical and architectural requirements to maintain ceiling clearances and achieve efficient structural performance.

Lateral load resistance will be provided by a system of tilt-up concrete walls and will be designed in accordance with ASCE 7-22 and the Florida Building Code 2023 requirements for Risk Category IV essential facilities in the Miami-Dade County HVHZ region.

Connections between precast joists and cast-in-place girders will be designed to ensure proper composite action and diaphragm continuity. The cast-in-place slab will act as a horizontal diaphragm transferring lateral forces to the moment frames and providing in-plane rigidity across each level. Reinforcement details at joist ends, bearing seats, and slab-to-beam interfaces will be configured to ensure reliable force transfer and prevent differential movement under service and ultimate loads.

Concrete strengths are anticipated to be 5,000 psi for columns and girders and 6,000 psi for precast joists, with low water-cement ratios and corrosion-resistant reinforcement suitable for South Florida exposure conditions. All embedded hardware and connection elements will be galvanized to meet durability requirements.

Preliminary sections are as follows:

1. Concrete Columns are 18” x 18”

2. Tilt-up walls are 9-1/4” thick

3. Floor joists are 24” deep spaced at 6’-8” O.C.

4. CIP slab is 4-3/4” for a 2-hour fire rating

Proposed Foundations

A new geotechnical investigation will be performed for the Doral Police Station Headquarters site to confirm subsurface conditions, groundwater elevation, and the recommended type of foundations (shallow/deep). Based on regional experience in the Doral area, the near-surface soils are expected to consist of loose to medium-dense sand and silty sand with variable limestone layers at depth, underlain by denser strata suitable for deep foundations. The groundwater table is anticipated to be within 3 to 5 feet below grade.

A 6-inch soil-supported slab-on-grade is planned for the first-floor level. Reinforcement will consist of welded wire fabric or deformed bars, with thickened slab areas provided at heavy-load locations such as evidence storage, sally port, and vehicle bays. Subgrade preparation will include compaction to 95% of modified Proctor density, installation of a vapor barrier, and fine grading to achieve uniform slab support.

If existing utilities or underground structures are found to conflict with proposed foundations, coordination will be carried out with the civil and utility design teams to resolve conflicts. The final foundation layout, spacing, and load distribution will be coordinated between the structural and geotechnical engineers during Design Development to confirm allowable capacities, settlement tolerances, and construction sequencing.

1.4 Materials

Reinforced Concrete Strength

ELEMENTS COMPRESSIVE STRENGTH

Footings 4,000 psi Columns 5,000 psi Elevated beams & slabs 4,000 psi Slabs on grade 3,500 psi Tilt up walls 5,000 psi

All concrete shall be normal weight. Reinforcing steel will be 60 ksi for all bar sizes.

Steel Grades

ELEMENTS GRADE

Rolled W, WT, C and MC Shapes ASTM A992, Grade 50 Rolled M, and S Shapes and Angles ASTM A572, Grade 50 Plates and Bars ASTM 572, Grade 50 Round HSS ASTM A500, Grade C Square and Rectangular HSS ASTM A500, Grade C Steel Pipe ASTM A53, Grade B Steel Deck ASTM A653, Grade 80

Reinforced Masonry

Concrete masonry unit (CMU) walls, should they be required, will have a design compressive strength will be f’m=2,000 psi. All masonry walls are proposed to be fully grouted, except partially grouted masonry walls may be specified for unloaded interior partitions.

Glazing and Fenestration

All exterior glazing systems, including windows, storefronts, curtain walls, and entry assemblies, will be designed and specified for compliance with the High Velocity Hurricane Zone (HVHZ) requirements of the Florida Building Code (FBC 2023). Products will be selected from systems that hold a current Florida Product Approval or a Miami- Dade Notice of Acceptance (NOA). Glazing assemblies will be impact-resistant and pressure-rated for the site design wind speed of 195 mph (Risk Category IV) in accordance with ASCE 7-22. Laminated safety glazing will be used throughout occupied areas, and framing systems will be anchored to the structural elements to transfer both positive and negative design pressures.

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