SECTION 05121
STRUCTURAL CAST STEEL COMPONENTS
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Copyright 2016 - 2017 ARCAT, Inc. - All rights reserved
** NOTE TO SPECIFIER ** Cast Connex Corporation; Steel components, architecturally exposed structural steel.
This section is based on the products of Cast Connex Corporation, which is located at:
366 Adelaide Street East, Suite 425
Toronto ON Canada M5A 3X9
Tel: (416) 806-3521
Email:
Web: www.castconnex.com
Cast Connex is the industry leader in the use of cast steel structural components in the design and construction of buildings and bridge structures. Products include pre-engineered connectors that simplify the design and enhance the performance of structures and custom designed cast steel nodes and components. Cast Connex takes pride in collaborating in the creation of safer, innovative, and more beautiful built environments.
PART 1 GENERAL
1.1 SECTION INCLUDES
** NOTE TO SPECIFIER ** Structural cast steel components are typically part of the structural system of the building and can be specified in their own specification section (i.e. Section 05121) or added to Section 05120 - Structural Steel. Provide this section to the structural engineer for the project so that relevant items can be included in the project specifications.
Delete any components below not relevant to this project.
A. Structural cast steel components including:
1. Universal pin connectors.
2. Architectural tapers.
3. Universal pin connectors and architectural tapers, where used together.
4. Diablo bolted splices.
5. High strength connectors.
6. Kaiser bolted brackets.
7. Custom designed castings.
8. Timber end connectors.
1.2 RELATED SECTIONS
** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
A. Section 03300 - Cast-In-Place Concrete.
B. Section 05120 - Structural Steel.
C. Section 06130 - Heavy Timber Construction.
D. Section 06180 - Glue-Laminated Construction.
E. Section 09900 - Painting and Coating.
1.3 REFERENCES
** NOTE TO SPECIFIER ** Delete references from the list below that are not required by the text of the edited section.
Item A.3. is specific to Kaiser Bolted Brackets.
Item C. is specific to Timber End Connectors.
Items D and E are specific to Custom Designed Castings.
A. American Institute of Steel Construction (AISC):
1. AISC 360 - Specification for Structural Steel Buildings.
2. AISC 341 - Seismic Provisions for Structural Steel Buildings.
3. AISC 358 - Prequalified Connections for Special and Intermediate Steel Moment Frames for Seismic Applications.
B. American Welding Society (AWS):
1. AWS D1.1 - Structural Welding Code - Steel.
2. AWS D1.8 - Structural Welding Code - Seismic Supplement.
C. American Wood Council (AWC):
1. AWC NDS - National Design Specification for Wood Construction
D. ASTM International (ASTM):
1. ASTM A802 - Standard Practice for Steel Castings, Surface Acceptance Standards, Visual Examination.
E. Castings Technology International (Cti):
1. SCRATA Surface Comparators.
1.4 SUBMITTALS
** NOTE TO SPECIFIER ** Delete items as required: Item C is specific to Custom Designed Castings.Item D is required when structural steel elements are to be welded to the structural cast steel components.
A. Submit under provisions of Section 01300.
B. Product Data: Casting material test reports and non-destructive test reports.
C. Shop Drawings for custom designed castings: Provide project specific, scaled, stamped engineered shop drawings and calculations including:
1. Design, detail and engineer castings including establishing interior and exterior dimensions and the preparation of casting specifications including material selection, non-destructive examination requirements, and all casting production parameters.
D. Welding Procedure Specifications (WPS) prepared in accordance with Section 1704.3.1, Table 1704.3 and Section 1708 of the IBC. WPS shall be developed by the Steel Fabricator for the welded joints between the steel castings and the attaching structural steel elements for each welding position, welding process, electrode manufacturer, filler metal trade name for the electrode type selected, and for all essential variable changes in the procedure qualification record (PQR) that exceed allowable tolerances. Each WPS shall be qualified by a documented PQR in accordance with Section 4 of AWS D1.1.
1.5 QUALITY ASSURANCE
** NOTE TO SPECIFIER ** Delete items as required: Item B is specific to Custom Designed Castings.
A. Casting Inspector Qualifications: in accordance with American Society for Nondestructive Testing, Inc. (ASNT), TC-1A, or equivalent independent qualified agency.
B. Engineer Qualifications: Professional engineer licensed in the jurisdiction of the project.
C. Manufacturer Qualifications: Specializing in structural cast steel components and having demonstrable experience in engineering, detailing, and supplying structural steel castings of a similar size as required for this project and for use in architecturally exposed structural steel. Member of the following organizations:
1. Associate Member of the American Institute of Steel Construction.
2. Affiliate Member of the National Council of Structural Engineers Associations.
3. Associate Supplier Member of the Canadian Institute of Steel Construction.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Deliver, store and handle materials to avoid damage. Protect materials from corrosion, deterioration, and damage.
1.7 SEQUENCING
A. Ensure that products of this section are supplied to affected trades in time to prevent interruption of construction progress.
1.8 COORDINATION OF TOLERANCES BETWEEN CASTINGS AND STRUCTURAL FRAMING
** NOTE TO SPECIFIER ** Delete items as required: Item B is specific to Custom Designed Castings. In cases where castings are to connect to heavy timber or glue-laminated timber, "Steel Fabricator" would typically be replaced with "Timber Supplier" in both items below.
A. The steel fabricator shall assume responsibility for the final coordination between cast steel product tolerances and the overall structural geometry, including allowances for fabrication and erection tolerances.
B. The steel fabricator shall notify the manufacturer of any discrepancies between the custom casting design and the overall structural geometry in a timely manner so that these discrepancies can be resolved prior to the creation of casting tooling.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. Acceptable Manufacturer: CAST CONNEX, which is located at: 366 Adelaide St. E. Suite 425; Toronto, ON, Canada M5A 3X9; Tel: 416-806-3521; Email: request info (); Web: www.castconnex.com
** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
B. Substitutions: Not permitted.
C. Requests for substitutions will be considered in accordance with provisions of Section 01600.
2.2 STRUCTURAL CAST STEEL COMPONENTS
** NOTE TO SPECIFIER ** Cast Connex Universal Pin Connectors are sleek, clevis-type standardized fittings designed to connect to hollow structural section (HSS) elements for use in architecturally exposed structural steel (AESS) applications. The connectors have been sculpted to provide smooth transitional geometry that cannot be achieved using standard fabrication processes. Fabrication of true-pin connections to HSS members is difficult, particularly where aesthetics is a concern for exposed steel. The use of Universal Pin Connectors simplifies design, detailing, and fabrication of critical exposed structural connections to ensure consistent and reliable architectural appearance including smooth, curving transitions from every view point. Delete if not required.
A. Universal Pin Connectors (UPC): Provide as shown on the drawings, as manufactured by Cast Connex Corporation, including:
1. Materials shall comply with manufacturer's current published data for dimensions.
2. Connectors shall be supplied with hot-dip galvanized carbon steel pins, carbon steel spacers, and electropolished stainless steel cap plates, countersunk retaining screws, and washers.
3. Carbon steel spacers shall be tack welded to and coated with the gusset plate to which the connector is pin connected.
4. Welds between the connectors and the attaching structural member shall be ground flush and smooth to the exterior of the connector or, if loading allows and the steel assembly incorporating the connectors will be within the building envelope, the welded joints may be prepared with a concave finish and an automotive body filler material that is compatible with the steel coating system may be used to mask the welded joint.
** NOTE TO SPECIFIER ** Cast Connex Architectural Tapers are hollowed, cast structural steel conical tapers designed to connect to hollow structural section (HSS) elements for use in architecturally exposed steel (AESS) application. Fabrication of hollow conical steel tapers is difficult and often necessitates forming and welding of plates which can result in an unsightly finished product. Incorporating cast architectural tapers will ensure availability, cost effectiveness, and consistent quality and appearance. Delete if not required.
B. Architectural Tapers (ART): Provide as shown on the drawings, as manufactured by Cast Connex Corporation, including:
1. Materials shall comply with manufacturer's current published data for dimensions.
2. Welds between the connectors and the attaching structural member shall be ground flush and smooth to the exterior of the connector or, if loading allows and the steel assembly incorporating the connectors will be within the building envelope, the welded joints may be prepared with a concave finish and an automotive body filler material that is compatible with the steel coating system may be used to mask the welded joint.
C. Architectural Tapers (ART) and Universal Pin Connectors (UPC), where used together: Provide as shown on the drawings, as manufactured by Cast Connex Corporation, including:
1. Universal pin connector and architectural taper shall be welded by fabricator to form the connection assembly. Strengths are governed by the Universal Pin Connector.
2. Materials shall comply with manufacturer's current published data for dimensions.
3. Connectors shall be supplied with hot-dip galvanized carbon steel pins, carbon steel spacers, and electropolished stainless steel cap plates, countersunk retaining screws, and washers.
4. Carbon steel spacers shall be tack welded to and coated with the gusset plate to which the connector is pin connected.
5. Welds between the connectors and the attaching structural member shall be ground flush and smooth to the exterior of the connector or, if loading allows and the steel assembly incorporating the connectors will be within the building envelope, the welded joints may be prepared with a concave finish and an automotive body filler material that is compatible with the steel coating system may be used to mask the welded joint.
** NOTE TO SPECIFIER **Cast Connex Diablo Bolted Splices are cast steel fittings that enable unobtrusive field bolted splices between circular hollow sections. The fittings are designed such that the bolted connection is inboard of the outer diameter of the connected elements. Splices made with Diablo Bolted Splices can be sheathed in thin-gauge plate to completely conceal the splice or can be left uncovered for a sleek, technical connection aesthetic. Delete if not required.
D. Diablo Bolted Splices (DBS): Provide as shown on the drawings, as manufactured by Cast Connex Corporation, including:
1. Materials shall comply with manufacturer's current published data for dimensions and connection strengths.
2. Unless otherwise noted, the steel fabricator shall supply cover plates to conceal the bolted portion of the splice. Cover plates shall be stitch welded to the splices and shall be coated using the same coating system as applied to the attaching structural steel elements.Unless otherwise noted, seams shall be calked or filled with an automotive body filler material that is compatible with the steel coating system and touched up with paint.
3. Welds between the connectors and the attaching structural member shall be ground flush and smooth to the exterior of the connector or, if loading allows and the steel assembly incorporating the connectors will be within the building envelope, the welded joints may be prepared with a concave finish and an automotive body filler material that is compatible with the steel coating system may be used to mask the welded joint.
** NOTE TO SPECIFIER ** Cast Connex High Strength Connectors simplify and improve connections to round hollow structural section (HSS) brace members in seismic-resistant concentrically braced frames. High Strength Connectors are modular, capacity-designed brace end connectors that accommodate bolted double-shear connection between round HSS braces and corner gusset plates. By eliminating shear lag in the brace connection and standardizing connection details, use of the connectors vastly simplifies connection design, and eliminates the need to field weld braces to frames, speeding up installation and reducing the cost of special inspection. Delete if not required.
E. High Strength Connectors (HSC): Provide as shown on the drawings, as manufactured by Cast Connex Corporation, including:
1. Materials shall comply with manufacturer's current published data for dimensions.
2. Meet requirements in ICC-ES ESR 3031 for Cast Connex High Strength Connectors.
3. The welded joint between the connectors and the round HSS or pipe member shall be a complete joint penetration (CJP) weld and shall comply with the requirements set forth for demand critical welds in AISC 341, AISC 360, AWS D1.1, and AWS D1.8 for welded connections in seismic-resistant applications.
4. Where High Strength Connectors are bolted to gusset plates, bolts must be pre-tensioned.
** NOTE TO SPECIFIER **Cast Connex Kaiser Bolted Brackets are a prequalified connection for Special and Intermediate Steel Moment Frames per AISC 358 and can be used in the retrofit of seismically deficient steel moment framed buildings or in new construction. The KBB moment connection is designed to eliminate field welding and, when used in new construction, to facilitate frame erection. There are two types of KBB available - those accommodating bolted connection to the beam flange (B-series) and those accommodating welded connection to the beam flange (W-series). Both types are designed to enable field bolting of the beam to the column, thus eliminating field welding. The B-series KBB are particularly well-suited to retrofit, as they offer a weld-free option for addressing seismically deficient steel moment frames.Delete if not required.
F. Kaiser Bolted Brackets (KBB): Provide as shown on the drawings, as manufactured by Cast Connex Corporation, including:
1. Materials shall comply with manufacturer's current published data for dimensions and shall meet the requirements set out for Kaiser Bolted Brackets in AISC 358.
G. Custom Designed Castings: Provide as shown on the drawings, as manufactured by Cast Connex Corporation, including:
1. Structural Requirements:
a. The steel castings shall be engineered to resist the forces indicated on the structural drawings and shall have general out-and-out dimensions as shown on the structural drawings.
2. Architectural Requirements:
a. The exterior shaping of the steel castings shall generally conform to that shown on the drawings. All edges shall be radiused and the Manufacturer may draft flat surfaces away from parting lines.
b. Castings shall be furnished with visual inspection of exterior surfaces to confirm compliance with ASTM A802 Level 1.
c. Welds between the connectors and the attaching structural member shall be ground flush and smooth to the exterior of the connector or, if loading allows and the steel assembly incorporating the connectors will be within the building envelope, the welded joints may be prepared with a concave finish and an automotive body filler material that is compatible with the steel coating system may be used to mask the welded joint.