1、Designation: C1242 12a1Standard Guide forSelection, Design, and Installation of Dimension StoneAttachment Systems1This standard is issued under the fixed designation C1242; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o
2、f last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTESections 5 through 9 were editorially reordered to follow a logical sequence in April 2013.INTRODUCTIONNatural building sto
3、ne is chosen as a buildings cladding for its beauty which endures with minimalmaintenance. Stone is durable when used properly. Exercising good judgment when selecting theparticular stone, determining the quarrying and fabrication techniques, designing the method ofattachment, and installing all com
4、ponents correctly maximizes these benefits. A properly executedstone cladding is designed and installed within the capabilities and limitations of the stone and supportsystem to resist all forces that work on them.This guide presents design principles that require consideration when designing anchor
5、ages andevaluating exterior stone to be compatible with its proposed use. It is an overview of currenttechniques and a review of minimum requirements for sound stone engineering and construction. Theguide does not list all possible methods of attachment nor does it provide a step-by-step procedure f
6、orstone anchor engineering. Knowledge gained from new engineering designs, testing of applications,and the investigation of existing problems are continually reviewed to update this guide. Commentfrom users is encouraged.Good judgment by architects, engineers, and contractors when specifying, design
7、ing, engineering,and constructing stone and other work that interfaces stone is necessary to use this guide. Users of thisguide should combine known performance characteristics of the stone, the buildings structuralbehavior, and knowledge of materials and construction methods with proven engineering
8、 practice.1. Scope1.1 This guide covers the categories of anchors and anchor-ing systems and discusses the design principles to be consid-ered in selecting anchors or systems that will resist gravityloads and applied loads.1.2 This guide sets forth basic requirements for the designof stone anchorage
9、 and provides a practical checklist of thosedesign considerations.1.3 This guide pertains to:1.3.1 The anchoring of stone panels directly to the buildingstructure for support,1.3.2 The anchoring of stone panels to subframes or tocurtainwall components after these support systems are at-tached to the
10、 building structure,1.3.3 The anchoring of stone panels to subframes or tocurtainwall components with stone cladding preassembledbefore these support systems are attached to the buildingstructure, and1.3.4 The supervision and inspection of fabrication andinstallation of the above.1.4 Observe all app
11、licable regulations, specific recommen-dations of the manufacturers, and standards governing inter-facing work.1.5 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand ar
12、e not considered standard.1.6 This standard does not purport to address all of thesafety concerns, 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 pr
13、ior to use. (See Tables 1 and2.)1This guide is under the jurisdiction of ASTM Committee C18 on DimensionStone and is the direct responsibility of Subcommittee C18.06 on AttachmentComponents and Systems.Current edition approved June 15, 2012. Published July 2012. Originallyapproved in 1993. Last prev
14、ious edition approved in 2012 as C1242 12. DOI:10.1520/C1242-12AE01.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States12. Referenced Documents2.1 ASTM Standards:2C97 Test Methods for Absorption and Bulk Specific Gravityof Dimension Stone
15、C99 Test Method for Modulus of Rupture of DimensionStoneC119 Terminology Relating to Dimension StoneC170 Test Method for Compressive Strength of DimensionStoneC406 Specification for Roofing SlateC482 Test Method for Bond Strength of Ceramic Tile toPortland Cement PasteC503 Specification for Marble D
16、imension StoneC568 Specification for Limestone Dimension StoneC615 Specification for Granite Dimension StoneC616 Specification for Quartz-Based Dimension StoneC629 Specification for Slate Dimension StoneC880 Test Method for Flexural Strength of Dimension StoneC1193 Guide for Use of Joint SealantsC12
17、01 Test Method for Structural Performance of ExteriorDimension Stone Cladding Systems by Uniform StaticAirPressure DifferenceC1354 Test Method for Strength of Individual StoneAnchor-ages in Dimension StoneC1496 Guide for Assessment and Maintenance of ExteriorDimension Stone Masonry Walls and Facades
18、C1526 Specification for Serpentine Dimension StoneC1527 Specification for Travertine Dimension StoneE632 Practice for Developing Accelerated Tests to AidPrediction of the Service Life of Building Componentsand Materials2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact A
19、STM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.FIG. 1 Dowel AnchorC1242 12a123. Terminology3.1 General DefinitionsFor definitions of terms used inthis guide, refer to Terminology C119.3.2 S
20、pecific definitions used in the design process are listedin 7.4.4. Significance and Use4.1 This guide is intended to be used by architects,engineers, and contractors who either design or install exteriorstone cladding for architectural structures.4.2 This guide is an industry standard for engineerin
21、gdesign considerations, documentation, material considerations,anchor type applications, and installation workmanship toassist designers and installers to achieve a proper and durablestone cladding.4.3 Stone and its support systems are part of a buildingsskin and shall be compatible with the behavio
22、r and perfor-mance of other interfacing systems, such as the curtainwall andsuperstructure frame.4.3.1 Every stone work application shall comply with ap-plicable building codes.4.3.2 It is not the intent of this Guide to supercede publishedrecommendations for specific stone types. Provisions of othe
23、rdimension stone industry publications should be reviewed andconsidered in addition to this Guides recommendations. Allindustry information should be considered with respect toproject specifications and requirements. If provisions of suchpublications differ from those in this Guide, it is acceptable
24、practice to follow the publications provisions if recommendedby the stone specialist defined in 4.4 for the specific conditionsof the individual project.4.3.3 Because stone properties vary, the range and variabil-ity of pertinent properties of the stone proposed for use shouldbe determined by testin
25、g and statistical methods that areevaluated using sound engineering principles. Use recent testdata where applicable. Always reference proven performanceof relevant existing structures.4.3.4 Changes in properties over time shall be considered.FIG. 2 Kerf AnchorC1242 12a134.3.5 Overall behaviors of a
26、ll building systems and compo-nents including the stone shall be interactively compatible.4.4 Stone SpecialistSome conditions require professionalexpertise to select and plan a proper anchoring system,establish appropriate testing requirements, interpret tests, de-sign and engineer the anchoring sys
27、tem, or monitor its fabri-cation and installation. A specialist is a person that comple-ments the capabilities of the project team by contributingspecific expert experience with the use, selection, design, andinstallation of dimension stone.4.4.1 Particular conditions where special expertise is sug-
28、gested to achieve a reliable installation:4.4.1.1 Where complex connections or anchoring methodsof unknown or questionable performance records are likely tobe considered or specified;4.4.1.2 Where the performance record of the specifiedsystems and materials is not known or questionable;4.4.1.3 When
29、multiple cladding materials occur on the samefacade;4.4.1.4 If the supporting structure or backup is more flexiblethan L/600 in any direction;4.4.1.5 If extreme loading could be caused by seismic,hurricane, tornado, or installation and handling methods;4.4.1.6 When special building code requirements
30、 prevail.4.4.1.7 If provisions of stone industry publications or proj-ect specifications differ from this guide.FIG. 3 Rod and Plug AnchorFIG. 4 Adhesive Embedded Threaded AnchorFIG. 5 Point Loading PreventionFIG. 5 Point Loading Prevention (continued)C1242 12a145. Selection Considerations5.1 Review
31、 the following factors before selecting a stonematerial, an anchoring system and subframe system from thoseoptions being considered:5.1.1 Have the stone materials under consideration per-formed well on existing buildings in similar exposures?5.1.2 Have the different anchoring and subframe systemsund
32、er consideration performed well on existing buildings insimilar exposures?5.1.3 How is the performance of the anchor and its engage-ment into the stone affected by installation and handlingprocedures?5.1.4 How are the performance and appearance of thesubframe, the anchors connection to the subframe,
33、 and thesubframes connections to the building structure affected bydifferential movements?5.1.5 Do the physical characteristics of the stone measuredby standard tests show the material has structural limitations?Which physical properties are important to the application, andwhich test methods measur
34、e those properties and their vari-ability? Refer to Table 2 for standard test methods andproperties they measure.5.1.6 Do the physical characteristics of the stone not mea-sured by standard tests suggest the material may have long-term durability concerns? Other properties, including (but notlimited
35、 to) resistance to chemical attack, weather-relatedstrength reduction, and dimensional changes, might be evalu-ated by special laboratory tests designed to obtain data undersimulated conditions.5.1.7 Does the project location or shape develop exceptionaldesign wind, or seismic loads, or does the sto
36、ne materialrequire higher safety factors than other stones not anticipatedby statutory codes?5.1.8 Do the anchor and subframe system accommodatebuilding dimensional changes caused by wind and seismicsway, thermal and elastic deformation, creep and shrinkage,and their combined effects?5.1.9 Will cont
37、iguous facade elements such as windows,other claddings, window supports, or window-washing andwall maintenance provisions influence the stone cladding, itsanchoring or subframe system?5.1.10 Do the anchor or subframe systems penetratewaterproofing, facilitate internal moisture collection, or pen-etr
38、ate wall insulation and cavity ventilation?5.1.11 Do the materials used resist corrosion, galvanic andchemical reactions?FIG. 6 Disc AnchorFIG. 7 Combined AnchorTABLE 1 Dimension Stone SpecificationsStone Type ASTM SpecificationCalciteAC503DolomiteAC503Granite C615LimestoneBC568Marble (exterior)BC50
39、3Quartz-BasedBC616QuartziteAC616Quartzitic SandstoneAC616SandstoneAC616SerpentineAC503Serpentine C1526Slate (roof) C406Slate (walls) C629TravertineAC1527AThis stone type is a subclassification.BThis stone type has subclassifications or grades.TABLE 2 Dimension Stone Test MethodsMeasures ASTM Test Me
40、thodliquid porosity and relative density C97combined shear with tensile unit strength from bending C99ultimate crushing unit strength C170primary tensile unit strength from bending C880capacity and deflections of panels assembled withtheir anchors onto their supporting backup structureC1201individua
41、l anchor strength C1354accelerated production of service life E632C1242 12a155.2 The following general rules are helpful in the design ofanchors and connections:5.2.1 The simplest connections are usually the best.5.2.2 Make connections with the fewest components.5.2.3 Use the fewest possible anchor
42、connection types inany particular project.5.2.4 Provide for adjustability in connections to accommo-date tolerances in materials and construction.5.2.5 Distribute the weight of stone or panel systems on nomore than two points of connection where possible.5.2.6 Make anchor connection locations access
43、ible to thecraftsman.5.2.7 Design connection components and stone sinkages toavoid entrapping moisture.5.2.8 At friction connections with slotted holes parallel tothe direction of load, specify proper bolts, washers, slot size,and bolt installation procedure.5.3 Safety FactorsIn order to design an a
44、nchoring system,the variabilities of the materials being considered should beknown and compensated. This is accomplished through the useof an appropriate safety factor to be applied to the stone, theanchorage, and the backup structure.5.3.1 Table 3 shows generally accepted Safety Factors forstone cl
45、adding by stone type. These factors are recognized byindustry specialists and publications and are based upon pastsuccessful practice. These factors are based on a maximumcoefficient of variation of 20 % when project samples are testedin accordance with Test Methods C99 or C880 for sedimentarystones
46、 in thicknesses of 2 in. (50 mm) or greater. Safety factorscould be changed when conditions listed under 5.3.2 or 5.3.3exist in the project.5.3.2 Exemplar Availability: A safety factor could be modi-fied if the long-term performance of the stone material, anchorand backup system cannot be verified b
47、y well-performingexemplars. Consult a stone specialist as defined in 4.4 for theappropriate change in safety factor.5.3.3 Structural Variables: A safety factor could be modi-fied if specific conditions exist on the project different fromthose upon which Table 3 values are based. Consult a stonespeci
48、alist as defined in 4.4 for the appropriate change in safetyfactor. Some specific conditions are:5.3.3.1 Critical material strength tests show increased vari-ability;5.3.3.2 Life expectancy of project exceeds forty years;5.3.3.3 Stone material loses significant strength over time;5.3.3.4 When design
49、ing stone at anchors;5.3.3.5 Anchor capacity tests show increased variability;5.3.3.6 Anchors will not be inspected in final position onbuilding;5.3.3.7 Anchors require varied installation techniques orvaried positions;5.3.3.8 Panel is used in higher-risk position such as a soffit,overhang, liner block, assembled on backup before beingerected or other similar position.6. Anchor Types6.1 Precast Anchors (see Fig. 8):6.1.1 Smooth dowels, wire hairpins (preformed wire spring-type anchors), threaded rods or bolts are used as anchors toattach stone cladding to prec
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