Japanese Architectural Standard Specification JASS 6

Japanese Architectural Standard Specification JASS 6 (1996) Structural Steelwork Specification

 The English version of J ASS 6 now available in a book format is the translation of   J ASS 6, Fifth Edition published in 1993. As J ASS 6, Sixth Edition in J apanese was published in 1996, it would have been ideal to publish the English version as before corresponding to the new edition. This booklet however only presents outlines of the important changes in the Sixth Edition of J ASS 6. The readers are thus required to prepare the English version of J ASS 6, Fifth E dition to follow the description of this booklet. Moreover a detailed description of the content of the revisions would be complex and difficult to read, this booklet has been prepared to present the gist of important changes. I t is recommended that the J apanese original shall be referred to for detail s of the revisions. The Sixth Edition includes small changes to the Appendix of the Fifth E dition, but these are not discussed in this booklet. As the enactment of  regulations concerning SN Steel (rolled steel for building structural use, J I S G 3136) now permits its use, the newly included Appendix 7 concerning this material has been included along with tables comparing the SN material with the SS and SM Steels that are already in use. I n this list of revisions, in cases where a passage can be compared with a part of the Fifth Edition, the passage is followed by its section number in parentheses.

LIST OF COMMITTEE MEMBERS Research Committee on Building Materials and Procedure Chairman Secretaries M embers

Katsuro Kamimura Yasukazu Takahashi (Omitted)

Fumiki Tomozawa

Sunao Nakane

T atsuo Y amashita Takeshi Azuma Mamoru K imura Takashi Makishi Moriyuki Matsuoka Masanori M ori Masayuki Okamatsu Masaaki Suko Saburo Terakado K iyoshi U runo

K imio H amano Teruo Kondo Shinji M atsushita Hi rohiko Matsuzaki K oji M orita Masaaki Oshima Yoshiaki Tagoku Hiroshi Terunuma Yoshitaka Yabe

Sub-committee on Steel Work  Chairman Secretaries Members

Atsuhide Hashimoto K azuhiko M ori ya Hirofumi Aoki Mitsuru I zumi K azunori K oshida  Tetsuro Matsubara  Tomoaki Miyano  Tadao Nakagome  Toyokazu Shimizu Atsuo Tanaka I wao Tsuyama

Working Group for Compiling the Outline of Important Changes in JASS 6, 6th Edition

Summary of the 1996 (Sixth E dition) J ASS 6 Revision

Preface

JASS 6 was prepared by carrying out revisions in line with the following policies. 1.

JASS 6 and the Technical Recommendations for Steel Construction for Buildings have been revised simultaneously to harmonize their content. New editions of the Recommendations for Quality Criteria and Inspection Standards of Steel Structures and the Standards for the Ultrasonic Inspection of Weld Defects in Steel Structures have been published.

2.

In JASS 6, the previous title, “Japan Architectural Standard Specification and Commentaries” is revised by removing “and Commentaries” to refer to only the main text in order to clarify its position as a specification for contract use.

3.

The commentaries in JASS 6 and information of special note are all summarized as technical guidelines. The volume concerning Factory Fabrication is, as a technical explanation, expected to serve as criteria for the provision of an autonomous

Section 1 General Provisions

1.

Contract Use Specification JASS 6 and the Technical Guidelines have been simultaneously revised with the commentaries on JASS 6, information worthy of special note, etc. all recorded in technical guidelines. The commentary has also been removed in order to strengthen users' understanding of JASS 6 as a document positioned as a contract use specification. In sum, the goal has been the creation of a practical specification for  contract use.

2.

Inspection Standard Certificate The term “mill sheet” has been replaced by the term “standard quality certificate,” and terms such as certificates including written test results, equivalent quality test certificates, original equivalent standard quality certificates, etc. concerning matters such as the categorization of product certificates as standard quality certificates and as goods certificates, have been defined.

3.

New JIS SN Steel  New JIS SN Steel (rolled steel for building structural use, JIS G 3136) has been incorporated, and the past SS steel (JIS G 3101) and SM Steel (JIS G 3106) eliminated.

4.

Quality Assurance

Organization).

Section 3

Materials

1.

Structural steel products now include not only JIS standard products, but also  products equivalent to JIS standard products and products approved by the Minister  of Construction (3.1 a. Structural Steel Products)

2.

SN steel (JIS G 3136, rolled steel for building structures) is added to Table 3.1 as a Japan Industrial Standard for Structural Steel Products, and the SS material (JI S G 3101, rolled steels for general structures) and SM material (JIS G 3106, rolled steels for welded structures) have been removed. Centrifugally cast pipes for welded structures (JIS G 5201) are also removed because they are a product approved by the Minister of Construction; not a JIS standard product.

3.

Steel whose yield ratio, carbon equivalent and cracking parameter comply with the special notes are stipulated for SN steel itself (3.1 a Structural steel products).

4.

Deck plate (JIS G 3352) is added to Table 3.2. (3.1 b Standards for shapes and sizes of structural steel products).

5.

Anchor bolts (previously, SS400) are categorized as structural use anchor bolts (SN400B or SN490B) and as assembly use anchor bolts (unless specially noted,

3.

The paragraph on grooving has been expanded and the grooving shape and scallop  processing are to conform with special notes. In cases where it is not spelled out in the special notes, a scallop may be either provided or not provided. Respective shapes are shown below, and concerning the curve of the arc of the scallop in particular, it is stipulated that, “it shall be processed so that it smoothly contacts the flange.” (4.7 Grooving).

Figure 4.2 Grooving the Scallop

6.

Standards for the temperature used to straighten distortion by heating have been  partially revised. The straightening temperature when the material is water cooled after air cooling shall be changed from “ 800 oC to 900 o C” to “850 oC to 900 oC”, and the temperature at the start of water cooling has been changed from “500 o C” to “650 o C.” (4.10 Straightening of distortion).

7.

The inside radius of bending of plates that must provide plastic deformation capabilities, such as columns and the haunch of beams and brace ends for example, has been required to set at more than 4 times the plate thickness. (4.11 Bending).

8.

A new provision has been added concerning backing strips, and stipulates that a plate thickness is to be equal to or greater than 9 mm, and in case where no scallop is formed, a two-piece type be used to fit to the shape of the corner of the fillet.

9.

A new provision has been added that stipulates that the leg length of the bead of tack  welding shall be a minimum of 4 mm and that at the corners of cold formed square steel pipe and other locations subject to cold plastic processing, tack welding shall be avoided.

Section 5

1.

Welding

A new provision stipulates that even where a qualification test for welders is specially noted, a welder who has already been approved based on an equivalent

3.

Provisions concerning backing strips are added. (5.7 General conditions for welding work)

(1) Tack welding of a backing strip on a beam - column joint using backing strips shall, as shown in Figure 5.2 a, not be performed in a range of 5 to 10 mm from both ends of the beam flange, nor within 5 to 10 mm of the startup point of the web fillet arc or the end of the fillet weld toe. (2) A fillet weld used to assemble a backing strip shall be between 4 mm and 6 mm of  single pass, and shall be between 40 mm and 60 mm long.

One-piece type backing strip (applied when a scallop is formed)

Run-off plate: attached to a backing strip One-piece type backing strip

L ocation where tack welding is permitted for backing Fillet weld S = 4 to 6 mm, 1 pass,

length = 40 to 60

 Tack welding

(a) (a) Section Figure 5.2 b.

Welding is to be avoided.

Case of Backing Strip Attached to the Outside of a Beam Flange

(3) As shown in Figure 5.2 b, when a backing strip is attached to the outside of a beam flange by on-site welding, it shall not be directly tack welded to the base metal such as beam flange or column flange. 4.

The need for a scallop for column - beam joints where a complete penetration weld is  performed on the beam flanges of the beam end welds shall be spelled out in the special notes. When there is no mention of it in the special note, it shall conform with 4.7 Grooving a (2). When a scallop is needed for fabrication, the authorization of the supervisor shall be obtained. (5.7 h. Scallop).

2.

The definitions of the bolt groups in tightening work have been revised from the  previous Figure 6.2 to the following figure. (6.4 Tightening of high strength bolts).

Bolt groups used for tightening work  Tightening sequence  Tightening of each bolt group shall be done from the center of the  joint towards the edge of the plate.

Section 9

1.

Inspection and Delivery of Products

Interim inspections, which are inspections performed by the receiving side, have been introduced and product inspections are categorized as in-house inspections and as receiving / interim inspections. Because it is extremely difficult to uniformly perform interim inspections, the items inspected, methods, quantities, acceptance/rejection criteria, performance timings, etc. shall be spelled out in the special notes.

Section 10

Construction / Site Work 

1.

The Scope of Application has been expanded to include "work related to quality and  precision of structural steel frameworks, and later incidental work." (10.1 Scope of  Application).

2.

To guarantee sound anchorage of column bases, anchor bolts shall be classified as either structural use anchor bolts or assembly use anchor bolts in acc ordance with the  purpose of the anchor bolts, that is, in the case of bolts that are load bearing (A type), attention is drawn for the need to specify the material in the design drawing. (10.3 Anchorage).

a.

Items that must always be spelled out in the special notes 10.3 h

 b.

“Mortar Strength” has been added.

Items that must be spelled out in case of adoption 4.10

Revised to (4) “SN400, SN490.”

8.3

“Treatment other than rust-proof paint” is added.

9.1 c 10.7

(1) “Interim inspection performed/not performed” is added. Deck plate and headed stud a. (3) “Case where used for structural use” is added.

12.4 b. (3) “Test of coating weight” has been moved from the items that must always be spelled out to this category. c.

Items , if not spelled out, shall comply with this JASS 6 specification 5.7 h. “Scallop necessary/unnecessary” is added. 10.7

Deck plate and headed stud e. (1) ii) “Joining method when not used” and “Welding location of   plug weld” have been added. g.. “Preliminary confirmation test (trial weld)” has been added.

Appendix 7. SN Steel Material Identification Codes Category Type of Product Method  Name of type SN 400A   e    d   a   r    G    f   g    K    0    4

  e    d   a   r   g    f   g    K    0    5

SN 400B SN 400C Others (Specially approved material) SN 490B SN 490C Others (Specially approved material) Others Remarks

Case where specification No. material grades are marked by label and/or stencil on every piece of product . (marking is a mill's option) plate and flat Rolled shapes (H, other shapes, flat) All plates shapes Full-length dot-line method *1 Color coding on Full surface stamp method Full-length letter method end * 2 JIS-rolled H Out-to-out Others constant rolled H (FR steel etc.) "SN400A" (Not stipulate d at this time) (Not stipulated at this time) *Note One green line to be displayed Two widely Two continuous Two "SN400B"  Two green separated dots dots discontinuous dots to be displayed lines A combination of the "SN400C" Three green company logo and a • ž  Same as 400B for now to be displayed lines Distinguished identification Company logo to be displayed One widely One continuous One discontinuous "SN490B" Two yellow Combination of the company separated dot dot dot to be displayed lines logo and a • › "SN490C" Three yellow Same as 490B for now. to be displayed lines Distinguished identification Company logo to be displayed Distinguished identification Company logo to be displayed - Stamped with a gauge at a * Note: If necessary, the dot intervals will be surveyed in the Essential Items  pitch of approx. 350 mm. future. A Name of steel type (SN400A, etc.) - When it is a company logo - Dot specifications B Shape Category Code and symbol, arrange Widely separated dots JIS-H: No code alternately. ompany logo

(End)

Outer size: Each company's identification code Continuous dots Others: Each company's identification code Optional items A Company name (code), Discontinuous dots company logo B Others: maker identification code, dimensions, etc. Letter specifications (reference) Dot ameter A Size: Min. 10 mm - To be marked on rolled H with a web height of 100 mm or  B Letter line interval: Max. 1,000 mm   more Example: - Indicated at two locations equidistant from the center  •™ Star Steel SN400A-S-FR: of the web (see Note 1) 600 X 200 X 12 X 22

- 11 -

Other than those on the left All plates and shapes

One o f the marking methods shown on the left is essential.

*1 *2 SN St eel M aterial I dentification Code Arrangements

Type of steel

  s    t   o    d    f   o   r   e    b   m   u    N

*1 Marking for full length dot line method

* 2 Marking for color code on end method

JIS-rolled H

Out to out constant rolled H

Others shapes (miscellaneous shapes, flat, FR steel, etc .)

Widely separated dots

Continuous dots

Discontinuous dots

All plates and shapes Color Number 

Coloring code on end Flat Steel

  n   e   e   r    G

Can be at either  edge. Channel steel

  n   e   e   r    G

 Near the center of the web Angle stee l

Center  of web

Center  of web

Center  of web Center of  width

  n   e   e   r    G

Integrated on either  the left or right flange and near the center of the flange

Bulb flats ste el  Near the center of  the web or near  the spherical part

  w   o    l    l   e    Y

H or I steel  Near the center of the web

Center  of web

Center  of web

Center  of web Center of  width

- 12 -

  w   o    l    l   e    Y

Angle steel with unequal sides or  une ual thickness

 Near the ce nter  of the web or  near the center  of the short side

Table 1. Comparison in Application of SN Stee l with Conventional SS/SM S teel Before Strength Category 400 N/mm2

JIS JIS G 3101

Standard SM 400

JIS G 3106

SM 400A SM 400B SM 400C

Uses Buildings, bridges, ships, cars, and other structures . Buildings, bridges, ships, cars, oil tanks, vessels, and other structures.

JIS G 3136 (SN Steel)

Standard SM 400 SM 400A SM 400B SM 400C SN 400A

SN 400B

SN 400C 490 N/mm2

JIS G 3101

SS490

JIS G 3106

SM 490A SM 490B SM 490C SM490YA SM490YB

Buildings, bridges, ships, cars, and other structures . Buildings, bridges, ships, cars, oil tanks, vessels, and other structures.

SS490 SM 490A SM 490B SM 490C SM490YA SM490YB

JIS G 3136 (SN Steel)

 Note 1 . Descrip tion with in shade (

After the Enactment of SN Steel Uses Buildings, bridges, ships, * After "Rolled steel for building structural use" has been cars, and other structures . firmly established, "buildings" will be eliminated from JIS G Buildings, bridges, ships, 3101 and 3106 (anticipated). cars, oil tanks, vessels, and other structures. Building structural use For secondary beams, studs, trusses, etc. ‡@Non -aseismic that are based on elastic design and are members. Non primarily connected w ith bolt s. welded structure. ‡AFor aseismic Materials intended to guarantee plastic deformation performance and welding members.  proper ties. For welded Used primarily as members necessary structure. for aseismic structure. ‡BFor through the Materials emphasizing type B  performance plus special properties in thickness strength the plate thickness direction. UT in addition to ‡A inspection required. Buildings, bridges, ships, * After "Rolled steel for building structural use" has been firmly cars, and other structures . accepted, "buildings" will be eliminated from JIS G 3101 and Buildings, bridges, ships, 3106 (anticipated). cars, oil tanks, vessels, and other structures. Building Structural Use.

SN 490B

‡AFor aseismic members. For welded structure.

SN 490C

‡BFor through the thickness strength in addition to ‡A

) indic ate the si tuation a fter the en actment o f SN Steel.

- 13 -

Materials intended to guarantee plastic deformation performance and welding  proper ties. Used primarily as members necessary for aseismic structure. Materials emphasizing type B  performance plus special properties in the plate thickness direction. UT inspection required.

Table 2-1 Comparison of the Properties of Rolled Steel for Building Structural Use (SN Steel) With those of SS Steel and SM Steel - Chemical CompositionStrength Category 400 N/mm2

 J IS

Standard

 J I S G 3101

SS400

 J I S G 3106

SM400A

SM400B SM400C  J I S G 3136 (SN Steel)

SN400A

SN400B

SN400C

490 N/mm2

 J I S G 3101  J I S G 3106

SM490A

SM490C SN490B

SN490C

 Notes :

t ≤  50 50 < t ≤ 200 t ≤  50 50 < t ≤ 200 t ≤  100 6

≤

t ≤  100

t ≤  50 50 < t ≤ 100  6

≤

t ≤  50 50 < t ≤ 100 16 ≤

SS490

SM490B

 J I S G 3136 (SN Steel)

 Thickness Category

C

Si

Mn

−

−

−

≤ 23

t ≤  50 50 < t ≤  200 t ≤  100 t ≤  50 50 < t ≤ 100 6

≤

t ≤  50 50 < t ≤ 100 16 ≤

2.5C ≤

≤35

Chemical Composition x 10-2 (* x 10-3) S* Cu Cr Mo Ni ≤50 − − − − ≤35

≤ 25 ≤ 20

≤35

≤ 22 ≤ 18 ≤ 24

• ≤ 20 ≤ 22 • ≤ 20 ≤ 22 • −

t ≤  50 50 < t ≤  200

−

P* ≤50

≤ 20

≤35 − ≤35

60∼ 140 ≤140 −

•

60∼ 140 • 60∼ 140 •

−

−

• ≤35

≤55

≤160

≤35 ≤35

≤35 ≤35

≤55

≤160

≤ 18

≤55

≤160

P CM

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

− −

−

−

−

−

−

−

−

• ≤30

• ≤15

−

−

−

−

−

−

−

−

−

−

−

−

−

−

≤ 36

≤ 26

−

−

−

−

−

−

• ≤20

• ≤ 8

−

−

−

−

−

−

−

−

−

−

−

−

• ≤50

• ≤50

•

•œ

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

≤ 44

≤ 29

−

−

−

−

−

−

(≤ 46) •

−

−

−

−

−

−

≤ 44

−

−

−

−

−

−

(≤ 46) •

≤35

≤35

≤35

≤35

≤35

≤35

≤55

≤160

≤30

≤15

• ≤55

• ≤160

• ≤20

• ≤ 8

•

•

•

•

≤ 20

• ≤ 18 ≤ 20 •

Ceq

−

≤50

≤ 20 ≤ 18

B

−

≤50

≤ 22 ≤ 18

V

•

1. Descr iptio n wi thin shade ( ) indic ate for S N Steel. Descr ipti ons with o e ers  indicate the noteworthy items for SN Steel. 2 2. t > 100 for JIS G 3101 and 3106 are omitted. Those in strength categories other than 400 N/mm  and 490 N/mm2  for JIS G 3101 and 3106 are omitted. 3. Those whose standard values are stipulated on the table are all recorded on mill sheets. 4. Concerning the chemical compositions, all items marked with the symbol •  are to be recorded on mill sheets whether stipulated or not. (When P CM has been adopted, it is recorded along with items marked with a • œ.) 5. Ceq = C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14 6. P CM = C +Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B

- 14 -

 Those in (

≤ 36

•œ

≤ 26

•œ

≤ 29 •œ

) are for thickness more than 40 mm.

For TM CP steel Pl ate thickness of 50 mm or less: Ceq ≤. Plate thickness over 50 mm: Ceq ≤. 40,

38, PCM ≤. PCM ≤. 26

24

Table 2-2 Comparison of the Properties of Rolled Steel for Building Structural Use (SN Steel) With those of SS Steel and SM Steel -Mechanical Properties-

Strength Category

JIS

400N/mm2

JIS G 3101 (SS Steel) JIS G 3106 (SM Steel)

Standard

SS400 SM400A SM400B SM400C

JIS G 3136 (SN Steel)

SN400A SN400B SN400C

490N/mm2

JIS G 3101 (SS Steel) JIS G 3106 (SM Steel)

SM490A

SM490C SN490B SN490C

 Notes:

Mechanical Properties Yield Point or Strength (N/mm2) 6 or greater, 12 or greater, less than 12 less than 16

t ≤ 50 50 < t ≤200 t ≤ 50 50 < t ≤200 t ≤ 100 6

≤

235 ≤ 215 ≤

235 ≤ 235 ≤  

t ≤ 50 50 < t ≤200 t ≤ 50 50 < t ≤200 t ≤ 100

 

275 ≤ 275 ≤

490∼610

315 ≤ 295 ≤

325∼445  

325∼445

295 ≤ 415 295 ≤ 415

Elongation Yield Steel Thickness Specimen Ratio YR  mm % t ≤ 5  No. 5  5 < t ≤ 16  No. 1A 16 < t ≤ 50  No. 1A   40 < t  No. 4



400∼510

235∼355

325 ≤

325 ≤

400∼510

215∼ 335 215∼ 335

235∼355  

Tensile Strength  N/mm2 400∼510

215 ≤

285 ≤

6 ≤ t ≤ 50 50 < t ≤100 16 ≤ t ≤ 50 50 < t ≤100

Over 16, Over 40, max. 40 max. 100

235 ≤ 215 ≤

245 ≤

t ≤ 100

6 ≤ t ≤ 50 50 < t ≤100 16 ≤ t ≤ 50 50 < t ≤100

16

245 ≤

 

SS490

SM490B

JIS G 3136 (SN Steel)

Thickness Category

490∼610

490∼610

≤ 80



 

≤ 80

5 16 40 6 16 40

< < < < < <

t t t t t t t

6