ASTM E564-2006(2018) 6250 Standard Practice for Static Load Test for Shear Resistance of Framed Walls for Buildings.pdf

1、Designation: E564 06 (Reapproved 2018)Standard Practice forStatic Load Test for Shear Resistance of Framed Walls forBuildings1This standard is issued under the fixed designation E564; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,

2、 the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice describes methods for evaluating the shearcapacity of a typical section of a framed wall, s

3、upported on arigid foundation and having load applied in the plane of thewall along the edge opposite the rigid support and in a directionparallel to it. The objective is to provide a determination of theshear stiffness and strength of any structural light-frame wallconfiguration to be used as a she

4、ar-wall on a rigid support.1.2 LimitationsThis practice is not intended to be used asa basis for classifying sheathing shear capacity or as anevaluation of combined flexure and shear resulting from thewall being loaded on a flexible foundation.1.2.1 The effect of sheathing variations is assessed byh

5、olding all other variables constant. Permitted variations inframing configuration and boundary conditions, however, re-quire accurate documentation of the test setup to validateacross-study comparisons of sheathing contribution to wallshear capacity.NOTE 1A wall tested on a flexible foundation is ev

6、aluated bycomparing shear stiffness and strength results to those of an identical walltested on a rigid foundation, following this practice. However, no methodsare given for the measurement of wall bending displacements or assess-ment of stress distribution resulting from foundation flexure.Any extr

7、apo-lation of wall racking behavior from the foundation conditions specifiedby this practice to flexible conditions shall be done with the support of acomparative test on a representative foundation.1.3 The values stated in SI units are to be regarded asstandard. The values given in parentheses are

8、mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.1.4 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

9、 safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopmen

10、t of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2E4 Practices for Force Verification of Testing MachinesE575 Practice for Reporting Data from Structural Tests ofBuild

11、ing Constructions, Elements, Connections, and As-sembliesE631 Terminology of Building Constructions3. Terminology3.1 DefintionsFor definitions of terms used in thisstandard, see Terminology E631.3.2 Definitions of Terms Specific to This Standard:3.2.1 rackingwhen applied to shear walls, refers to th

12、etendency for a wall frame to distort from rectangular torhomboid under the action of an in-plane force applied parallelto the wall length.3.2.2 shear wallstructural subassembly that acts as acantilever/diaphragm to transfer horizontal building loads tothe foundation in the form of horizontal shear

13、and an overturn-ing moment.3.2.3 upliftthe vertical displacement measured at theloaded end stud with respect to the test apparatus.3.3 Symbols:3.3.1 aheight of cantilevered shear wall, in metres (feet).3.3.2 blength of cantilevered shear wall, in metres (feet).3.3.3 Cinitial length of the diagonal =

14、a21b2, in metres(feet).3.3.4 diagonal elongation, in millimetres (inches).1This practice is under the jurisdiction of ASTM Committee E06 on Perfor-mance of Buildings and is the direct responsibility of Subcommittee E06.11 onHorizontal and Vertical Structures/Structural Performance of Completed Struc

15、tures.Current edition approved July 1, 2018. Published July 2018. Originally approvedin 1976. Last previous edition approved in 2012 as E564 06 (2012). DOI:10.1520/E0564-06R18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. Fo

16、r Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internation

17、ally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13.3.5 total horizontal displacement of the top of the

18、wallmeasured with respect to the test apparatus, in millimetres(inches). This value includes effects due to panel rotation,translation, and shear.3.3.6 Gglobal shear stiffness of the assembly, includesrotation and translational displacements as well as diaphragmshear displacement.3.3.7 Gintinternal

19、shear stiffness of the assembly, includesonly the shear displacement of the wall in calculation.3.3.8 Pconcentrated load applied at the top edge of thewall at the selected reference displacement, in newtons (pound-force).3.3.9 Puhighest load level held long enough to recordgage measurements, in newt

20、ons (pound-force).3.3.10 Suultimate shear strength of the assembly, in new-tons per metre (pounds per foot).4. Significance and Use4.1 This practice is used to determine static load capacityand deflection of framed wall sections. This practice is used toestablish a load deflection curve. It is used

21、to evaluate variousframed systems representative of those intended for use inactual building constructions.5. Summary of Practice5.1 The shear strength and stiffness of a wall assembly andits connections are determined by forcing a racking deforma-tion. This is accomplished by anchoring the bottom e

22、dge of thewall assembly and applying a force to the top edge orientedperpendicular to the wall height dimension and parallel to thewall length dimension. Wall distortion is restricted to the planeof the unstressed wall. The forces required to rack the wall andthe corresponding displacements at each

23、load interval aremeasured.6. Wall Test Assembly6.1 GeneralA wall assembly consists of frame elementsincluding any diagonal bracing members or otherreinforcements, sheathing elements, and connections. The wallassembly tested in accordance with this practice shall representthe minimum acceptable stiff

24、ness using the targeted frame andsheathing materials.6.2 ConnectionsThe performance of the wall test assem-bly is influenced by the type and spacing of framingconnections, sheathing-to-frame connections and the wall as-sembly anchorage connection to the test fixture, floor, orfoundation.6.2.1 All co

25、nnections used in the test shall be representativeof those used in the actual building construction.6.2.2 Connector size and location on the frame shall corre-spond to specifications.6.3 Frame RequirementsThe frame is an integral part ofthe wall test assembly. The test wall shall consist of the same

26、number, size, and grade of framing members as are intended tobe used in service.6.4 Test SetupProvisions shall be made to resist rigid-body rotation in the plane of the wall where this reflects the useof the assembly in actual building constructions. This shall bedone by application of relevant grav

27、ity or other loadingssimultaneously with the racking loads. The bottom of theassembly shall be attached to the test base with anchorageconnections simulating those that will be used in service. Loaddistribution along the top edge of the wall shall simulate flooror roof members that will be used in t

28、he actual buildingconstruction. When required to minimize distortion,reinforcement, such as a strong-back attached along the lengthof the top plate or a steel bearing plate attached to the end ofthe top plate shall be installed. The wall test assembly shall belaterally supported along its top with r

29、ollers or equivalentmeans so as to restrict assembly displacement outside the planeof loading. Lateral support rigidity shall not exceed thatprovided in the actual building construction.6.5 Wall SizeTest wall size will vary with the studyobjectives. Tests conducted to assess the structural perfor-ma

30、nce of actual building construction shall have dimensionscommensurate with those of the shear walls being simulated.6.6 Curing and ConditioningFor framed wall construc-tions containing elements whose structural performance is afunction of age, curing conditions, moisture content, ortemperature, the

31、wall test assembly shall be conditioned priorto the test in accordance with the appropriate voluntaryconsensus standards, manufacturer specifications, or industrycuring practices for the various products used, or as needed tomeet the intent of the test. Care shall be taken to ensure thatcuring and c

32、onditioning are representative of that expected inthe actual building construction and that all elements of thewall test assembly at the time of the test are approximately atthe equilibrium conditions expected in service.6.7 Environmental EffectWhen required to evaluate wallassembly performance for

33、simulated environmental conditions,preconditioned specimens shall be tested in an environmentalchamber.7. Procedure7.1 Number of TestsTest a minimum of two wall assem-blies to determine the shear capacity of a given construction.For unsymmetrical shear walls, run the second test with thespecimen ori

34、entation reversed with respect to the direction ofthe load application used in the first test. If the strength or shearstiffness of the second test is not within 15 % of the results ofthe first test, test a third wall assembly with the wall orientedin the same manner as the weaker of the two test va

35、lues. Thestrength and stiffness values reported shall be the average ofthe two weakest specimen values if three or more tests areperformed.7.2 Loading Procedure:7.2.1 GeneralRacking loads shall be applied parallel toand at the top of the wall, in the central plane of the frame,using a hydraulic jack

36、 or similar loading device capable ofmaintaining a constant displacement rate for continuous load tofailure or holding a static load in the case of incrementalE564 06 (2018)2loading. Loads shall be applied at a constant rate of displace-ment to reach the target limit (that is, limiting displacement

37、ofultimate load) in no less than 5 min.7.2.2 Gravity loads, when required, shall be applied alongthe top of the wall in a manner consistent with floor or roofframe loading.7.2.3 Static Load TestMaintain the duration of load appli-cation at each increment at least 1 min before load anddeflection read

38、ings are recorded. Apply preload of approxi-mately 10 % of estimated ultimate load and hold for 5 min toseat all connections. Remove the load, wait 5 min, and read allgages as the initial readings. At load levels approximately onethird and two thirds of the estimated ultimate load, remove theload an

39、d record the recovery of the wall after 5 min. Reload tothe next higher load level above the backoff load. Continueloading and unloading in this manner until ultimate load isreached.7.3 Data AcquisitionThe objectives of a study determinethe data required from this test. These generally includequanti

40、fication of the shear strength and stiffness of the walldiaphragm. Shear strength is denoted as the maximum load perunit length of the wall. Shear stiffness requires measurement ofthe racking load and corresponding shear displacement. Shearstrain is determined as the angular displacement (/a, see Fi

41、g.1).7.3.1 Racking load shall be monitored using either the linepressure to a calibrated loading ram or a load cell mounted inseries with the loading device. When load measurement isaccomplished by monitoring hydraulic line pressure, the loadversus pressure calibration shall have been developed at t

42、hesame, or greater, hydraulic flow rate as occurs in the test toreduce chances of overestimating load due to drag effects. Theloading measurement shall be accurate to 61 % of themaximum measured load. The load measuring instrumentationshall be calibrated in accordance with Practices E4.7.3.2 Displac

43、ement MeasurementsShear displacementmeasurement of a wall frame shall be accurate to 0.25 mm(0.01 in.). Two approaches to estimating the shear stiffness areprovided in this practice: direct measurement and that esti-mated by measuring the diagonal elongation of the frame.7.3.3 Direct MeasurementFour

44、 (numbered in Fig. 2) dis-placement measurements are used to evaluate shear deforma-tion by the direct measurement. The measurement is compli-cated by the fact that the assembly tends to rotate and translateas a rigid body, as the frame is deformed from a rectangle to askewed parallelogram. In addit

45、ion, the individual elements ofthe shear diaphragm rotate with respect to the frame as theshear load is applied.7.3.3.1 Slip at the BaseFor this reading, the displacementis measured at the centroid of the bottom plate with respect tothe test machine in a direction parallel to the length of the wall.

46、7.3.3.2 Uplift of the Stud at the Loaded EndThe distancewhich the bottom of the stud at the loaded end of the wall islifted off the base of the test machine indicates the degree ofrigid body rotation. This displacement divided by the horizon-tal distance along the base from the vertical-displacement

47、-measurement reference point to the opposite end of the bottomplate is the tangent of the angle of rotation of the wall. As theNOTE 1Horizontal shear displacement calculated on the basis of thediagonal elongation simplifies the test by eliminating the need to measurerigid body rotation and horizonta

48、l translation of the wall.C1!25 b1!21a22 2!substituting:a21b25 c2gives:2 c 122 2 b 5 0and: 52 c 12!2 bFIG. 1 Horizontal MeasurementNOTE 1The horizontal load is measured using a load cell in serieswith the loading ram. Wall shear displacement is determined using eitherfour gages to separate shear fro

49、m uplift, rotation, and horizontal slip of thewall or by measuring diagonal elongation to measure wall rackingdeformation directly. To restrain rigid-body rotation, apply boundaryconditions to simulate those that control wall performance in service.FIG. 2 Test Wall ConfigurationE564 06 (2018)3end stud is rotating as well as being lifted, the uplift readingshall be taken as close as possible to the centerline of the stud.7.3.3.3 Top Plate Horizontal DisplacementThismeasurement, taken at the centroid of the top plate, gives totalh