ASTM C1568-2005 Standard Test Method for Wind Resistance of Concrete and Clay Roof Tiles (Mechanical Uplift Resistance Method)《混凝土和粘土屋面瓦抗风性标准试验方法(机械提升阻力法)》.pdf

1、Designation: C 1568 05Standard Test Method forWind Resistance of Concrete and Clay Roof Tiles(Mechanical Uplift Resistance Method)1This standard is issued under the fixed designation C 1568; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re

2、vision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.Note Section 9.3 was corrected and the year date changed on April 14, 2005.1. Scope1.1 This test method cover

3、s a procedure to determine themechanical uplift resistance of concrete and clay roof tiles,which relates to the wind resistance of an air-permeable rooftile system as applied to a roof.1.2 The procedure covers mechanically-fastened attachmentsystems, adhesive-set attachment systems, and mortar-set a

4、t-tachment systems, or combinations of attachment systems, thatare used to apply tile to a roof.1.3 The values stated in inch pound units are to be regardedas the standard. The values in parentheses are given forreference only.1.4 This standard does not purport to address all of thesafety concerns,

5、if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C43 Terminology of Structural Clay ProductsC

6、67 Test Methods for Sampling and Testing Brick andStructural Clay TileC 140 Test Methods of Sampling and Testing ConcreteMasonry UnitsC 1167 Specification for Clay Roof TilesC 1492 Specification for Concrete Roof Tiles2.2 SBCCI Standard:SBCCI SSDT 11 SBCCI Test Standard for DeterminingWind Resistanc

7、e of Concrete or Clay Roof TilesNOTE 1This standard is based on the International Code CouncilsICC/SBCCI SSTD 11 Test Standard for Determining Wind Resistance ofConcrete or Clay Roof Tiles, and work derived from the tile industrystesting programs completed in the Redland Wind Tunnel in the UK.2.3 AS

8、CE Standard:ASCE 7 Minimum Design Loads for Buildings and OtherStructures3. Terminology3.1 DefinitionsFor definitions of terms used in this testmethod refer to Terminology C43, and Specifications C 1167and C 1492.4. Significance and Use4.1 The method of attachment of roof tiles to the roof deck,or s

9、upport structure, is one factor in the resistance of concreteand clay roof tiles to the action of wind. Several systems ofattachment, and even combinations of systems, are used in theapplication of tile to a roof. The mechanical uplift resistance ofthe tile, when applied to the roof by any attachmen

10、t systemapproved by, and in accordance with, the manufacturersinstructions, is a primary factor in the tiles resistance to theaction of wind. This test method determines the mechanicaluplift resistance that is related to resistance to the uplift forcesacting as a result of wind. Natural wind conditi

11、ons differ withrespect to intensity, duration, and turbulence; these conditionsare beyond the means of this test method to simulate.5. Apparatus5.1 A test apparatus shown in Fig. 1 shall be used to test themechanical uplift resistance of roof tiles. The triangulatedframework and loading bar shall be

12、 constructed of tubular steelof sufficient strength to remain rigid when loads of up to 500lbf are applied to the test tile. The frame shall be fixed to thefloor to prevent movement of the frame and to provide a solidreference plane for deflection measurements. The joints of theframe shall be rigid,

13、 however, the loading bar rotates about theframe to facilitate the loading of the test tile. The other end ofthe loading bar is attached to a hydraulic jack, or similarlycontrollable mechanical device, which allows the load to beapplied gradually and to be maintained at any desired loadwhile deflect

14、ions are being measured The load is applied to thetile through a load transfer device (steel bolt with chain1This test method is under the jurisdiction of ASTM Committee C15 onManufactured Masonry Units and is the direct responsibility of SubcommitteeC15.06 on Roofing Tile .Current edition approved

15、April 14, 2005. Published April 2005. Originallyapproved in 2003. Last previous edition approved in 2004 as C 156804.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to

16、 the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.linkage) and is measured by a load cell capable of operating atup to 500 lbf. The roof framing used for the specimens shall beeit

17、her fixed to the floor, anchored to the triangulated frame-work, or weighted to prevent the roof framing from being liftedduring the test. Deflections are measured by dial gages firmlyfixed to a reference plane so that as the tile is loaded and the tileor test frame distorts, the reference position

18、remains static. Adial gage plunger is placed on top of the tile nose in a centralposition to measure the mechanical uplift of the tile.Additionaldial gages are required depending on the method of tileattachment: (a) in mechanically fastened systems, a dial gageat the fastener in the bead of the tile

19、 to measure withdrawal ofthe fastener; (b) when a clip is used, a dial gage at the clip tomeasure deflection and permanent set of the clip; and (c) whena barrel tile is used, a dial gage at the roll of the tile to measurethe deflection of the roll due to the rotation of this type of tile.6. Procedur

20、e6.1 Drill the test tile and install the steel-bolt load-transferdevice into to the tile as follows:6.1.1 Drill a hole along the centerline of the exposed widthof the tile at 0.76 times the tile length from the head of the tileusing a14 in. (6 mm) non-percussion, cutting carbide bit.Discard any tile

21、 that, after drilling, exhibits spalling or chip-ping around the hole in excess of14 in. (6 mm). Installa4in.(100 mm) long,14 in. (6 mm) diameter steel bolt witha1in.(25 mm) diameter steel washer under the tile through the hole.It is not prohibited to shape the washer to match the contour ofthe unde

22、rside of the tile. It is also not prohibited to omit thewasher.6.2 Install the tile in the same manner as on a roof, inaccordance with the manufacturers instructions, on a smallsection of roof deck constructed to fit within the frame of thetest apparatus as shown in Fig. 1. The rafters shall be secu

23、relyanchored to the frame or the floor and the sheathing firmlynailed to the rafters. If the roofing underlayment transfersloads, the underlayment shall be installed and, if required,battens shall be nailed to the sheathing. The tile to be testedshall then be installed onto the roof deck section. Ti

24、les in thecourse below the test tile shall be installed to ensure that the tilebeing tested is at the correct angle to the sheathing with thenose of the test tile at the correct angle to the tile course below.6.3 The loading shall be applied through a chain linkageattached to the load transfer bolt

25、at a rate that will causedeflection of the tile nose of approximately 1 in.(25 mm) perminute.6.3.1 The load cell shall be zeroed to take out the weight ofthe load transfer bolt and chain linkage.6.4 Each type of tile installation shall be tested three (3)times with a new tile and fixing. The positio

26、n of the tile shallbe moved each time so that new fixings will not be affected byany damage caused by previous tests. The sheathing, under-layment, and battens shall be replaced when damage is suchthat the test result is compromised. If the failure of any of thethree (3) tests varies from the averag

27、e failure by more thantwenty percent (20 %), then three (3) additional tests shall beperformed to provide a total of six (6) tests.7. Conditioning7.1 See the conditioning specified for each specific instal-lation system.8. Failure8.1 The failure criteria are described for each specificinstallation s

28、ystem and tile.9. Calculation of Mechanical Uplift Resistance9.1 The reported mechanical uplift resistance shall be thefailure load corresponding to the failure criteria described foreach specific attachment system, and adjusted as in 9.2.9.2 The failure load shall be adjusted when the attachmentsys

29、tem is used to provide resistance to more than one (1) tile byFIG. 1 Mechanical Uplift Resistance Test ApparatusC1568052dividing the failure load by a load factor of two (2). If theattachment system provides resistance for only one (1) rooftile, the load factor is one (1).9.3 The mechanical uplift r

30、esistance is the net result of theAttachment resistance minus the tiles gravity moment.W = average weight of tile (lbf).u = test roof deck slope (degrees).a = installed tile angle with respect to the test roof deck(degrees).Lg= tile gravitational moment arm (ft). The tile gravita-tional moment arm,

31、Lg, is the orthogonal distancefrom the tiles center of gravity to the tiles axis ofrotation.Lf= tile attachment moment arm (ft). The tile attachmentmoment arm, Lf, is the orthogonal distance from thepoint of load application to the tiles axis of rotation.F = failure load as determined under 9.2 (lbf

32、).S.F. = safety factor = 2.0.Mg= tile gravitational moment (ft-lbf). The gravitationalmoment, Mf, is the moment created by the deadweight of the tile for the roof deck slope.Mg5 W cos u2a! Lg!Mf= fastening system attachment moment (ft-lbf). Theattachment moment, Mf, is the allowable uplift resis-tan

33、ce for the attachment resistance for the roof deckslope.Mf5 F cos u2a! Lf Mf, S.F.!10. Tile Installation Using Mechanically-FastenedSystems10.1 Tile shall be installed in accordance with the manufac-turers instructions, using supplementary clips if so specified.10.2 It is not prohibited to omit the

34、tile underlaymentsystem.10.3 When a hot-mopped underlayment system is used, theunderlayment shall be left to reach ambient temperature beforetile installation.10.4 For a tile fixed without a clip, one dial gage shall bemounted to measure the upward deflection of the tile34 in. (19mm) from the nose o

35、f the tile and in line with the point ofapplication of the load.10.5 For a tile fixed with a clip, load the tile in such amanner that the load and deflection can be measured at severallevels of deflection up to a maximum of14 in. (6 mm). At adeflection of14 in. (6 mm), the load shall be removed and

36、thepermanent set of the clip measured, then the loading shall betaken to ultimate failure of either the fixing or the tile. For a tilefixed with a clip, one dial gage shall be mounted to measure thedeflection at the clip position.10.6 Failure Criteria:10.6.1 For a tile without clips, failure of the

37、tilesmechanically-fastened attachment system shall be consideredas the load required to deflect the nose of the tile by two (2) in.(51 mm), or to break the tile, or to cause14 in. (6 mm)withdrawal of the fastener (nail, screw, etc.) at the tile head.For a tile with clips, failure of the tiles mechan

38、ically-fastenedattachment system shall be considered as the lower of the loadsrequired to develop a permanent set at the clip of18 in. (3 mm),or a14 in. (6 mm) withdrawal of the fastener (nail, screw, etc.)at the tile head. For a barrel tile with clips, failure of the tilesmechanically-fastened atta

39、chment system shall be consideredas the lower of the loads required to develop a permanent setat the clip of18 in. (3 mm), or a14 in. (6 mm) withdrawal ofthe fastener (nail, screw, etc.) at the tile head, or a deflection oftwo (2) in. (51 mm) at the roll of the tile. In all cases, if theultimate fai

40、lure of the mechanically-fastened attachment sys-tem or the tile occurs before any one of the above criteria aremet, then the load at ultimate failure shall be considered asfailure of the tiles mechanically-fastened attachment system.10.6.2 The mechanical uplift resistance of themechanically-fastene

41、d tile is the lowest load corresponding toany of the failure criteria described in 10.6.1, adjusted inaccordance with Section 9.11. Tile Attachment Using Adhesive-Set Systems11.1 The adhesive system shall be installed in accordancewith the manufacturers instructions using supplementary clipsif so sp

42、ecified.11.2 When a hot-mopped underlayment system is used, theunderlayment shall be left to reach ambient temperature beforetile installation.11.3 Tiles shall be at a temperature of 1000F (380C) plusor minus 50F (6 30C) when installed. The adhesive systemshall be cured in accordance with the manufa

43、cturers instruc-tions. Testing must be completed within 28-days of installation.11.4 Specimens shall be tested at a surface temperature of750F (210C) plus or minus 50F (6 30C) measured with asurface-mounted thermocouple and recorded on a chart toconfirm that the surface temperature meets the require

44、d testtemperature.11.5 One dial gage shall be mounted to measure the upwarddeflection of the tile34 in. (19 mm) from the nose of the tileand in line with the point of application of the load.11.6 For a tile fixed with a clip, load the tile in such amanner that the load and deflection can be measured

45、 at severallevels of deflection up to a maximum of14 in. (6 mm). At adeflection of14 in. (6 mm), the load shall be removed and thepermanent set of the clip measured, then the loading shall bere-applied and increased until ultimate failure of either theattachment system or the tile. For a tile fixed

46、with a clip, onedial gage shall be mounted to measure the deflection at the clipposition.11.7 Failure Criteria:11.7.1 Failure of the tiles adhesive-set attachment systemshall be considered as the load required to cause deflectionwithout any further increase in the load, or to cause aseparation of th

47、e system, or to cause the tile to break. Anadhesive-set attachment system that includes mechanical fas-teners and/or clips shall use the failure criteria of this sectionand 10.6 for the fasteners and/or clips.11.7.2 The mechanical uplift resistance of the adhesive-settile is the lowest load correspo

48、nding to any of the failurecriteria in 11.7.1, adjusted in accordance with Section 9.C156805312. Tile Installation Using Mortar-Set Systems12.1 The mortar-set system shall be mixed and installed inaccordance with the manufacturers instructions.12.2 When a hot-mopped underlayment system is used, theu

49、nderlayment shall be left to reach ambient temperature beforetile installation.12.3 Tiles shall be at a temperature of 1000F (380C) plusor minus 50F (30C) when installed. It is not prohibited tobegin testing 1-day (24-h) after installation Testing must becompleted within 28-days of installation.12.4 Tile shall be tested at a surface temperature of 75F(240C) plus or minus 50F (6 30C) measured with asurface-mounted thermocouple and recorded on a chart toconfirm that the surface temperature meets the required testtemperature.12.5