SANS 10120-3 HA-1990 Code of practice for use with standardized specifications for civil engineering construction and contract documents Part 3 Guidance for design Section HA Struc.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. SABS 0120 : Part L Section HA-1990 Structural steelwork (sundry items) PART 3 : GUIDANCE FOR DESIGN SECTION HA CONTENTS Page Number Clause PRE-TENDER CON

4、SIDERATIONS . Investigations Administration . Documentation . General requirements . DESIGN REQUIREMENTS General Minor Structures . Handrailing Systems Selection Tubular handrail stanchions Open Grid Flooring . General Floorplate Flooring Materials Loading Floor strength . Floor stiffeners . Floorpl

5、ate joints Removable floorplates Built-in Items . APPLICABILITY OF OTHER CODES . TEST PROCEDUKES QUALITY CONTROL AND OTHER CONSIDERATIONS . DRAW 1 NGS Drawing HA.3.1 . Typical Handrail Dimensions . First Revision August 1990 Thi s section of tile code supersedes SABS 0120 : Part 3 : Section HA-1984

6、Approved by the COUNCIL OF THE SOUTH AFRICAN BUREAU OF STANDARDS SABS 0120 : Part 3 Section HA-,1990 Strv :tural stee; work (sundry i terns) SABS 1200 HA : STRUCTURAL STEELWORK (SUNDRY ITEMS) NOTE: The clause nurnber(s) given at the beginning or af,Ler the heading of a cl ause islare, unless otherwi

7、se stated, the number(s) of the relevant clause(s) of SABS 1200 HA. PRE-TENDER CONSIDERATIONS INVESTIGATIONS. No specific recommendations. ADMINISTRATION. No specific recommendations. DOCUMENTATION Genra-?e!iremenJs. Except where ructural steelwork constitutes a minor portion f f 3 a conrac.E Wwfiic

8、h SABS 1200 A forms part of the contract document, SABS 1200 AH) in the contract document in preference to either SABS 1200 AIyC:Fde SABS 1200 AA). DESIGN REQUIREMENTS GENERAL. In addition to the recommendations given below, and to those given in Section 12 of the South African Institute of Steel Co

9、nsructions Handbook Metal Flooring, Stairways, Ladders, Platf rms and Handraillng , take into account the recommendations given in Section H47 that have a bearing on the design of the work to be executed in accordance with SABS 1200 HA and apply those details, with the appropriate alteration to the

10、details, to the project in hand. MINOR STRUCTURES (Subclause 3.1). Be conservative in the design of members for structures to be fabricated from commercial quality steel and use a yield stress of not more than 225 MPa . Note particularly the recommendations given in Subclauses 2.2.4 and 3.2.1.2 of S

11、ection H of Part 5 of the code. HANDRAILING SYSTEMS (Subclause 5.2.6) Selection. Except in the case of stainless steel, which may be less than the fa1 loiiTig, the minimum wall thickness of tubular handrails and tubular kneerai l s should be 2,5 mm . Choose a system with slip joints (ferrules) to el

12、iminate site welding. Handrail ing components shall not be welded after having been galvanized. The accepted height from the underside of the stanchion baseplate to the centre of the handrail is 1,O m . A two-rail system is the norm for industrial applications. For domestic use, a balustrade with op

13、ening sizes in accordance with the National Building Regulations is recommended, having due regard for the safety of small children. Stair angles to the horizontal lie between 20“ and 50“. Ramps are less than 20“ and ladders are in excess of 50“. Except for stainless steel or other corrosion-resista

14、nt materials, the minimum wall thickness of tubular stanchions should be 2,5 mm . Ensure that the system offers the hand a free, continuous and smooth passage on the top rail with no obstructions that require the removal of the hand from the handrai l . The handrail system is only as strong as the f

15、oundation to which the stanchion is bolted, e.g. bolting the stanchion to brickwork or inferior concrete or kickplates can be hazardous. In general, handrailing stanchions should not be bolted to kickplates that are welded to flooring. In a highly corrosive environment, select a corrosion-resi stant

16、 material such as stain1 ess steel . Galvanizing usually suffices for outdoors or medium corrosive areas such as coastal areas. The use of tubular stanchions in a corrosive environ- ment can lead to internal corrosion, which cannot easily be detected. Internal corrosion might reach the stage where t

17、he stanchion fai l S. Regular maintenance checks are required in this instance. A1 ternatively, open type, structural steel or solid forged stanchions with no internal surfaces may be used. All surfaces are then visible and can be checked for corrosion. Tubular Handrail Stanchions. The following typ

18、es of stanchions are in use: 1) General . 2) General structural ). 3) eneral srnal l works). 4) Structural steel work. SABS 0120 : Part 3 Section HA-1990 Structural steel work (sundry i toms) a) Top mounted, with horizontal base. b) Top mounted, with sloping base and attached to sloping surface. c)

19、Side mounted, wlth handrail sloping. NOTE: Left side of stairs, going up = Left-hand stanchion Right side of stairs, going up = Right-han d) Peg-mounted removable stanchion with base paral l el to handrai l and kneerai l . e) Peg-mounted removable stanchion with horizontal base and sloping handrail

20、- not recommended for loads. f) Side-mounted goose neck stanchion with fixing hoTts at right angles to stanchion. g) Top mounted, with horizontal base but with handrail and kneerail on slope (mounted on treadj. It is essential to specify the distance “X“ from the underside of the base to the interse

21、ction of the pitch line of the stair treads and the centre1 i ne of the stanchions. (See Drawing HA-3.1. ) OPEN GRID FLOORING (Subclause 5.2.8) General. Open grid flooring should be designed and detailed to have a depth and - spacing of span-bars that ensure that the deflection of any bar under full

22、 design load does not exceed 11200th of the clear span, or 10 mm, whichever is the lesser. FLOORPLATE FLOORING (Subclause 5.2.9) Materials. Almost exclusively, patterned plate, known as “Vastrap“, is used for plZTZ-irfioring in South Africa. This plate is rolled in four standard thicltnesses 3,0; 4,

23、5; 6,O and 8,O mm measured under pattern. Pattern projections are rdised 1,6 mm above the plain plate. The majority of p1al.e used is of commercial quality but Grade 43A or 3OOW steel quality plates could be ordered. Corrosion-resistant steel 3CR12 could be used in special applications. Loading. Flo

24、ors should b designed to carry, as a minimum, the superimposed load sfipuTated in SABS 016053. Higher loadings might be required by the employsr. Floor Stren th. The governing design criteriori for floorplates supported on two - -+ si6s onTy an bolted or welded to the floor beams, is that the deflec

25、tion due to the uniformly distributed load and the superimposed load g, should not excsed L/150. Plate thickness t, in mm, and load q, In kN/m2, can be calculated from the formula: - 3 t = 4,85 X 10 .L. q l/J or converse1 y: 206. t = -77-3 q A1 lowabl e stress resistances of floorpl ates are provSde

26、d in Section 3 of the South African Institute of Steel Constructions Handbook. Floor Stiffeners. Where the expected deflection is likely to be excessive, or where TTcXoof point loads is anticipated, the resistance of these floors can be significantly enhanced by the proper design and application of

27、approprie!te floor stiffeners such as flats or angles welded to the urrderside of tile floorplat.es. F1 oorpl ate Joi rits Supported by thc b) corner protection angles for columns in warehouses, garages, factories, etc.; 5) General procedures and loadings to be adopted for the design of buildings. S

28、ABS 0120 : Part 3 Section HA-1990 Structural steel work (sundry i terns) c kerb angles; d seating angles for cable trench covers, etc. The design of the anchoring tangs or lugs, particularly in the case of (a) above, is important. If possible, flanges or splays should be provided to obtain a suf- fi

29、cient length of fillet weld to the parent member because butt welds at the ends of the tangs are often poorly executed. Be sure to provide sufficient bond length, including fish tails at the free end. Check for congestion and interference with reinforcement and that concrete can be easily placed. Pr

30、ovide air escape holes where necessary. Anchorages for corner protection angles, kerbing and the like are generally at f 600 mm centres. In cases such as inverted channels cast into the wearing surfaces of floor slabs, stagger the anchorages on each flange. Regarding seating angles for “Vastrap“ pla

31、te cable trench covers, a narrow strip of flat bar welded along the top at the toe of the angle of the same thickness as the cover- plate is a convenient and neat means of positioning the coverplates. Embedded sur- faces are not painted and exposed areas can be prepared, primed and painted in the us

32、ual way on completion of the work. In regard to built-in items generally, it is imperative to ensure that levels or alignment/straightness (or both) are accurately mairitai nedlensured at a1 l times. 3. APPLICABILITY OF OTHER CODES 3.1 Regard the appl icabl e provisions of SABS 01626) as mandatory.

33、4. TEST PROCEDURES 4.1 The requirements of Clause 7 of SABS 1200 HA are applicable. 5. QUAL.ITY CONTROL AND OTHER CONSIDERATIONS 5.1 Apply the relevant provisions of SABS 01577) to the design of structural steelwork. 6) The structural use of steel. 7) Qual i ty systems. SABS 0120 : Part 3 Section HA-1990 Structural steel work (sundry i terns) 6abs pta