§ 27-588 Use of used and unidentified materials.

The utilization of used materials and unidentified or ungraded materials shall be limited to non-structural elements, except:

   (a)   Such materials (or elements) may be reused, or continued in use, at stress levels to which the materials or elements were subjected in the previous construction, or at load capacity as demonstrated by load test procedures as described in subdivision (a) of section 27-599 of article three of this subchapter.

   (b)   Unidentified materials may be graded by the recovery and test of representative samples, or by other means satisfactory to the commissioner.

   (c)   Used materials shall be considered to be graded where the grade is clearly indicated on the approved plans for the existing construction and may be used at the allowable stress levels for that grade of like material as established in the building code in force at the time the plans for the existing construction were approved.

TABLE 10-1
Inspection of Materials and Assemblies

Materials	Elements That Shall Be Subject to Controlled Inspection a, b, d	Elements That Are Not Subject to Controlled Inspection a, c, d
Steel	None	All structural elements and connections
Concrete	Materials for all structural elements proportioned on the basis of calculated stresses seventy per cent or greater, of basic allowable values. See article five for specific requirements relating to "quality control of materials and batching."	(1) All materials for structural elements proportioned on the basis of calculated stresses less than seventy per cent of basic allowable values.(2) Concrete materials for:(a) Short span floor and roof construction proportioned as per section 27-610.(b) Walls and footings for buildings in occupancy group J-3.(3) Metal reinforcement.
Aluminum	None	All structural elements and connections.
Wood	None	All structural elements and connections.
Reinforced gypsum concrete	None	All structural elements.
Masonry	None	All structural elements.
Other	Requirements as may be established in other subchapters of this code or by the commissioner.

 

Notes for Table 10-1:

a For general provisions relating to inspection see section 27-132.

b All structural materials and assemblies subject to controlled inspection shall be tested and/or inspected at their place of manufacture and evidence of compliance with the provisions of this subchapter shall be provided as stipulated in articles four through twelve.

c Mill, manufacturer's and supplier's inspection and test reports will be accepted as evidence of compliance with the provisions of this code for all structural materials and assemblies not subject to controlled inspection.

d Basic allowable stress values as referenced herein shall denote allowable stress value without increase for infrequent stress conditions as established in this code or in the applicable reference standard for the material or element in its proposed use.

TABLE 10-2
Inspection of Methods of Construction

Materials	Operations on Structural Elements That Shall Be Subject to Controlled Inspection a, b, d	Operations on Structural Elements That Are Not Subject to Controlled Inspection a, c, d
Steel	(1) Welding operations and the tensioning of high strength bolts in connections where the calculated stresses in the welds or bolts are fifty per cent or more of basic allowable values.	(1) Welding operations and the tensioning of high strength bolts in connections where the calculated stresses in the welds or bolts are less than fifty per cent of basic allowable values.
	(2) Connection of fittings to wire cables for suspended structures, except where cables together with their attached fittings are proof-loaded to not less than fifty-five per cent of ultimate capacity.	(2) All other fabrication and erection operations not designated for controlled inspection.
Concrete	Except for those operations specifically designated in this table are not subject to controlled inspection, for all concrete, the operations described in subdivision (a) of section 27-607 shall be subject to controlled inspection.	(1) All operations relating to the construction of members and assemblies (other than pre-stressed members) which involve the placement of a total of less than fifty cubic yards of concrete and wherein said concrete is used at levels of calculated stress seventy per cent or less of basic allowable values.
		(2) Placing and curing of concrete for all:(a) Short span floor and roof construction as per section 27-610(b) Walls and footings for buildings in occupancy group J-3.
		(3) Size and location of reinforcement for walls and footings for buildings in occupancy group J-3.(4) All other operations not described in subdivision (a) of section 27-607.
Aluminum	Welding operations in connections where the calculated stresses in the welds are fifty per cent or more of the basic allowable values.	(1) Welding operations in connections where the calculated stresses in the welds are less than fifty per cent of basic allowable values.
		(2) All other fabrication and erection operations not designated for controlled inspection.
Wood	Fabrication of glued-laminated assemblies and of plywood components.	All other operations not designated for controlled inspection.
Reinforced Gypsum Concrete	None	All operations incident to the fabrication and placement of structural elements.
Reinforced Masonry	(1) Fabrication of prefabricated units.	(1) All masonry work for buildings in occupancy group J-3.
	(2) Placement and bedding of units; sizes of members, including thickness of walls and wythes; sizes of columns; the size and position of reinforcement, in place, and provisions for curing and protection against freezing for all reinforced masonry construction unless such operations are specifically not designated for controlled inspection.	(2) All mixing of mortar.
		(3) All other operations not designated for controlled inspection.
Unreinforced Masonry	Placement and bedding of units and sizes of members including thickness of walls and wythes; sizes of columns; cleanouts; and provisions for curing and protection against freezing for all masonry construction proportioned on the basis of structural analysis as described in section four of reference standard RS 10-1B, unless such operations are specifically not designated for controlled inspection.	(1) All masonry work for buildings in occupancy group J-3.
		(2) All mixing of mortar.
		(3) All other operations not designated for controlled inspection.

 

Notes for Table 10-2:

a For general provisions relating to inspection see section 27-132.

b All construction operations designated for controlled inspection shall be inspected by the architect or engineer designated for controlled inspection during the performance of such operation.

c Certification by the fabricator or erector, as applicable, will be accepted as evidence of compliance with the provisions of this code for all construction operations not subject to controlled inspection.

d Basic allowable stress values as referenced herein shall denote allowable stress value without increase for infrequent stress conditions as established in this code or in the applicable reference standard for the material or element in its proposed use.

Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 1995/017.

§ 27-589 Equivalent systems of design.

Nothing in this subchapter shall be construed to prohibit the use of any system of design, alternate to those indicated, provided that it can be demonstrated to the satisfaction of the commissioner that such system of design will provide a factor of safety against structural failure consistent with the requirements of articles four through twelve of this subchapter, fire safety in consonance with the requirements of subchapters three through eight of this chapter, and such other characteristics pertinent to the safety of life, health, and property as prescribed in this subchapter or as may be required by the commissioner. Alternate or equivalent materials or methods of construction shall be subject to the provisions of section 27-133 of article seven of subchapter one of this chapter.

§ 27-590 Deferred detailing.

Where structural elements are normally detailed on shop or working drawings, the application for the permit shall so state, and issuance of the permit shall be conditioned upon future submission of such shop or working drawings showing the approval of an architect or engineer with regard to such elements, or of a signed statement by an architect or engineer to the effect that such drawings were prepared to his or her satisfaction. In cases where the detailing of structural elements has been made on the basis of fire-resistance ratings, load tables, or similar data as given in manufacturer's catalogues, the application for approval of the plans shall so state and issuance of such acceptance shall be conditional upon submission of a statement by the manufacturer, or of other supporting documentary evidence of accreditation furnished by the manufacturer, attesting to the accuracy of the data and stating that such data were derived in conformance with the provisions of this code. Where the detailing of structural elements has been made on the basis of data published in technical documents of recognized authority issued by, or accredited by, the agency or association promulgating the applicable reference standard cited in this code, such statements will not be required.

Article 2: Structural Design – General Requirements

§ 27-591 Stability.

Except as provided in article twelve of subchapter eleven of this chapter with regard to foundation elements, a building, or any element thereof shall be proportioned to provide a minimum factor of safety of 1.50 against failure by sliding or overturning. The required stability shall be provided solely by the dead load plus any permanent anchorages which may be provided.

§ 27-592 Bracing.

Unless otherwise specified in the reference standards, members used to brace compression members shall be proportioned to resist an axial load of at least two per cent of the total compressive design stress in the member braced, plus any transverse shear therein.

§ 27-593 Secondary stresses.

Secondary stresses in trusses shall be considered and where of significant magnitude, their effects shall be provided for in the design.