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1、Designation:D4945–00StandardTestMethodfor1High-StrainDynamicTestingofPilesThisstandardisissuedunderthe®xeddesignationD4945;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapprova
2、l.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.ScopeD1143TestMethodforPilesUnderStaticAxialCompres-siveLoad41.1Thistestmethodcoverstheprocedurefortestingverti-calorbatterpilesindividuallytodeterminetheforceand3.Terminologyvelocityresponseofthepiletoanimpactf
3、orceappliedaxiallybyapiledrivinghammerorsimilardevicethatwillcausea3.1Exceptasde®nedin3.2,theterminologyusedinthislargestrainimpacttothetopofthepile.ThistestmethodistestmethodconformswithTerminologyD653.applicabletodeepfoundationunitsthatfunctioninamanner3.2De®nitionsofTermsSpeci®ctoThisStandard
4、:similartofoundationpiles,regardlessoftheirmethodof3.2.1capblockÐthematerialinsertedbetweenthehammerinstallationprovidedthattheyarereceptivetohighstrain--``,,,,,`,````,,,````,`,-`-`,,`,,`,`,,`---strikerplateandthedrivecapontopofthepile(alsocalledimpacttesting.hammercushion).1.2Thisstandarddoesno
5、tpurporttoaddressallofthe3.2.2cushionÐthematerialinsertedbetweenthedrivecapsafetyconcerns,ifany,associatedwithitsuse.Itistheontopofthepileandthepile(alsocalledpilecushion).responsibilityoftheuserofthisstandardtoestablishappro-3.2.3impacteventÐtheperiodoftimeduringwhichthepriatesafetyandhealthpra
6、cticesanddeterminetheapplica-pileismovinginapositiveand/ornegativedirectionofbilityofregulatorylimitationspriortouse.Foraspeci®cpenetrationduetotheimpactforceapplication.SeeFig.1.precautionarystatement,seeNote5.3.2.4momentofimpactÐthe®rstmomentoftimeafterthestartoftheimpacteventwhentheaccelerati
7、oniszero.SeeFig.NOTE1ÐHigh-straindynamictestingrequiresastrainatimpactwhich1.isrepresentativeofaforceinthepilehavingthesameorderofmagnitude,3.2.5pileimpedanceÐindicatestheresistanceapilehastoorgreater,thantheultimatecapacity
