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<br />C.l <br />.... <br />\..1') <br />C'J <br /> <br />c <br /> <br />4 <br /> <br />MODEL TESTS OF BOULDER DAM <br /> <br />SECTION <br /> <br />PAGE <br /> <br />77 First deflection measurements....no..................uu.....___n.. <br />78 Movement of unsupported base............................ <br />79 Deflection of supported baae.............___....___......___........ <br /> <br />""""",,,,'''''''''''''''''''''' 119 <br />...................,................ 119 <br />......................................... 122 <br /> <br />ALTEIlATIONS TO MODEL <br /> <br />80 New mercury bag....__................... ...............- <br />81 Revision of instrument stand__..m....____........__.... <br />82 Loading canyon walls___......_.... .................................... <br /> <br />........................' .................... 124 <br />""",,""""""'''''''''''''' 124 <br />...............h.....h,""h"","'"'' 124 <br /> <br />,ADDITIONAL TESTS <br /> <br />83 Movement of bas6.............._...........................................................-.............,............. 125 <br />84 Tangential deflection measurements.....m........._n....................................m.....no- 127 <br />85 Measurements of twists and strMus....mhn..........................._m...........__h._____..... 128 <br />86 Elastic conditions of modeL......................................................... .......................... 129 <br /> <br />CHAPTER V--DEFLECTIONS, STRAINS, AND STRESSES <br /> <br />RADlAL DEFLECTIONS <br /> <br />87 Normal load tests................."..................................................................................... 131 <br />88 Partial load and overload tests...................-.... ................ .................................... 137 <br /> <br />TANGENTIAL DEFLECTIONS <br /> <br />89 Methods of making tests..,............ m...'''''''' .. <br />90 Results of tests.................... ................ ....-................ <br /> <br />....... 137 <br />................ 142 <br /> <br />SLOPE DEFLECTIONS <br /> <br />91 Apparatus ......................................................................... ..................................m..... 142 <br />92 Principle of operation....................................................... ......m....................... 146 <br />93 Results of tests.......................................................................................................... 146 <br /> <br />MATHEMATICAL BASIS FOR STRAIN MEASUREMENTS <br /> <br />94 Stress-strain relations ............................................................................................ 150 <br />95 IDquations for principal strains............................................................................ 151 <br />96 Stress.strain equations ............................................................................................ 161 <br /> <br />APPARATUS FOR STRAIN MEASUREMENTS <br /> <br />97 Strain gages m.............................................................. <br />98 Mounting str.in g.ge............. ...................... <br />9-9 Gage lines ........................................................ <br /> <br />......................... .................... 153 <br />......................................... 154 <br />............................................... 154 <br />