02660nas a2200241 a 450000500170000000800410001703500150005810000160007324500960008926000670018530000240025249000270027650001700030350200590047352015170053265000320204970000360208170000470211770000420216471000870220681000590229385600660235220260818085706.0160801s2015    th uu m rtt   0|  a1eng d  a.b121671501 aDas, Amrita10aCylindrical wedge-type compression free bracing system for moment resisting frame structure  aPathum Thani, Thailand :bAsian Institute of Technology,c2015  a101 leaves :bill. 1 aThesis ;vno. ST-15-05  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology  aThesis (M. Eng.) - Asian Institute of Technology, 2015  aIn  order  to  make  the  structure  safe  during  seismic  vibration,  t he  structure  can  be  strengthening by using different kinds of bracing system. If ordinary brace is used for this  purpose, it will be buckled under lateral compressive load.  This study will investigate the performance of the  cylindrical wedge - type  non - comp ressive  bracing system.  The whole experimental investigation has been done into two  main phases:  p reliminary  test and  final  test.  A  9mm  bar  has  been  tested  by  UTM  for  preliminary  test.  Furthermore, in the  first  phase of  final  test ,  total  six  specimens  of  1 2mm  diameter  have  been  used  for  uniaxial  experiment. In  the  second  phase,  the  test  has  been  performed  by  applying cyclic load through the  hydraulic  actuator on a half portal frame. The cylindrical wedge grip worked properly under compression by releasing  the sacrificial  steel, which prevent buckling of steel core. The hysteretic loops from tension load are not  stable  in  size  and  slope  even  the  same  load.  It  is  anticipated  that  non - linearity  from  the  device  itself  or  from  the  gripping  device  of  the  universa l  testing  machine  may  cause  this  unstable hysteresis. The developed device needs  some improvement to use in the inclined  configuration.  Pre - loaded  spring  as  well  as  the  improvement  in  steel  casing  for  perfect  alignment of both wedge and steel core might re solve problem from inclined configuration. 0aEarthquake resistant design0 aPunchet Thammarak,eChairperson0 aPennung Warnitchai,eExamination Committee1 aAnwar, Naveed,eExamination Committee2 aAsian Development Bank - Japan Scholarship Program (ADB - JSP),eScholarship donor2 aAsian Institute of Technology.tThesis ;vno. ST-15-06  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B04032