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\1r rrrununrnJ ih;�t P(l ��;nrincm. inrur��m;iir cun.tructi�m juint. an�l i�r nack unurul juint� thal :�rc <br /> .p:ircJ m;i�inmm Ji�tnnce� uf I'_ fcct ap:ut, crntcr-lu-ccntcr. in hu�h thc IungituJin;d nnd Iran>rcrsc <br /> dircctinns. ('rack cuntrul juints inay hc crcalcd by pl;�cing :m inscrt ur groucc into �hc Gcsh concrctc <br /> surfncc Juring tini,hinE. ur hy ,a��cuuin�; ihc cuncrctc alicr it has iniiially sc�-up. 1\'c rcconnncnJ th:u <br /> ihe dcpih ul ihc crack contrul i��ints hc ;�ppruzim:ilclv '; tho tlticknctiti uf lho cuncrcic: ur nhou� I'i: indt�� <br /> Jccp fur Ihc rcrnmmcnJcJ runer:ic thi:kncs. uf 6 inehc.. 11'r also rceummcnJ Ih:u tlic cr;ick contru� <br /> juints bc scalcJ teilh an nppn�pri:ur sr:d:mt ti, help rc,uirt ��atcr intiltr;itiun intu Ihr juiN�. <br /> 4.8.4 Asphalt•Treated Base <br /> lierouse p;i�ement. ma}' he rumtrucicJ during the �cr� �r;uuns. cunsidrr;itiun may br gi�en lu cu�erinp <br /> Ihc ;uras tu hc p;nrJ ��'i�h a.ph;ill-urmcd basc IA'I'BI li�r pruiccliun. Lighl-Juty p;��cmcnl arcas shoulJ <br /> he wrf:�ccJ ��idi ? inchcs ul':1'I'B. and hca�y-duty p:��cmcnt :ucas tihuulJ hc surfaccd �ciih G inchc, nl <br /> A'I I4. Priur to pl.irrmcnt ul thc linal pa�cnunt srciiuns, �cc rccommcnd diai arcas uf A'1'13 paccmcni <br /> �;iilure hc rcmoccd anJ Ihc suh�radc rcpaircd. II A"fH is uscd anJ is scniccablc ��licn tinal pa�'cnunts <br /> arc cunsiniricJ. ihc crutihcd xurfacing basc cuursc r,m hc climin,ucJ. anJ ihc dcsign punlanJ ccnicn� <br /> cuncrc�c ur,isphalt rnncrcic p.iccmcnt �hickncss can hc pl;iccJ Jircc�ly u�cr Ihc ATH. <br /> 4.8.5 Cement•treated Soll <br /> In licu ul A'I'H. cunsidcraliunti ahuuld alsn hc gi�cn �u prcparing :md protccting paecmrm arc:is ��i�h <br /> rcmcnl-�rcatcd suil. 8ascd on our espericnrc.��c anlicipatcd thal:�����,.��,,:���i> s �„ ���«��,� «�»��u �,> <br /> �eci�ht �sill hc nccJcJ �i�r ux ��ith ihr on si�c hll suils. '1'hc trcauncnt dcpth shuulJ hc al Icast IR inchc+. <br /> II ccmrnl-trca�cJ suil i. uxd ;mJ is ,cniccaMr �chcn p;ncmcnts ;irc cnnstructcd. thc planncd p;��cmcnt <br /> � s�etiun ma�� hc cunstrueicd dirrrd�� un thc ��ntrnl-trc;ilyd snil subgr;idc a�lcr it is prup�nlV rlcan�d u( <br /> I��u,c drhris. 'fhc rcmcnl ratio and dcpth��f trrauncnl �hould bc ccalu;ucJ priur lu cunalrurti��n. <br /> 4.9 EARTH�UAKE ENGINEERING <br /> 4.9.1 Selsmlclfy <br /> l hc Pugcl SuunJ ;u.a iti ;i .ti�mic;ill� arti�c rcgion and h;is c�pericnccd �huus:md� uf canhyuakcs in <br /> hisiurical iimc. tiri.miriiy in ihis rc�i�m is anrihwcJ prim:irily tu thc inicractiun bct��ccn thc Pacitic. <br /> luan Jc fur.i �md North Amcriran platcs. 'fhc Juan dc Fuca platc i+ subducling bencath Ihc Norih <br /> Amcrir:m Platc. I{;�ch �'car I.0011 iu 'UUU carlhyunkcs orrur in Orcgun and \Vashinglun. Ila�ccccr. Ic�+' <br /> ��I' thrsc arc t�pie:dl� fch hccausc ihc m;ijority of thc cnrthyuakcs arc rclati�cly minor. smallcr ihan <br /> Richlci tna�nituJc i. <br /> In r�ccni �cars, tl�rcc I:uEc r;uthyu;ikcs urcwmJ �chirh resuhcd in sui�c liyucfaction in loosc allu�ial <br /> drpusii, anJ sipniticam damagc w somc siructures. 'flicsc wcrr ❑ 19a9 carthquakc �aiih u Richtcr <br /> m;iEni�uJc nl 7J ih;u urrurrcd in thc Ol�mpia :u'ca; a 1965 canhyu.�kc ��ith a Richtcr magnitudc uf G.5 <br /> that urcurrcd ruughl� h;df ��:n hchrccn Scattic nnd 1'ncuma: anJ thc Pcbnmq '8. 20b1 Nisyually <br /> r:nthyuakc�eith a Kich�rr ma�nituJc uf6.8 th;n occurrcd nonh ufOI�'mpia. <br /> Ur��l:n�inrcr. ha> c�alu:ncJ ihc .itc fur scisinir hazarJ� incluJinc liyucfxtion, latcr;�l sprcaJing. Gwl� <br /> rupiurr anJ cmthyuakc inJuccJ IandsliJinE. (ltu' ccahiatiun inJic:ucs �hal Ihc si�c Jucs no� ha�c <br /> liyurliahlc ..�ils prn.•nt :md �hcrcti�rc al.0 has nu risk uf liyucfac�ion-induccd I.ucral spic�iding. In <br /> aJJni��n ihr .uc ha. :i I�,�� ii.4, u(r;uihyuoF,r-inJucrd I;mJ.lidin�. <br /> - --- --— - -------- <br /> I ,;, •. . , , ,,,,� „„ PaAC 11 GlOEMGIM![Rf� <br /> i, . .� . - 'ij <br />