eric johnston (98768299@MAIL.WSU.EDU)
Sun, 19 Apr 1998 13:39:35 -0700
Message-ID: <199804192039.NAA26021@cheetah.it.wsu.edu> Date: Sun, 19 Apr 1998 13:39:35 -0700 From: eric johnston <98768299@MAIL.WSU.EDU> Subject: base isolation systems for seismic designs To: CIVIL-L@hermes.csd.unb.ca Last Friday I was in a seminar given by the structural engineer who designed the seismic retrofit of the historic San Fransisco city hall. Part of the design was the installation of about 500 rubber base isolators. I thought that was that was pretty neat Anyways I got thinking and have a couple questions 1) Are there problems with differential settlements with base isolators? 2) Are there problems with diffential movement of isolators? 3) What are the best ones to use, rubber, lead core rubber, or friciton pendelums? Are there others? Here at WSU we are doing some research on shock absorbers attached to bracing members. Questions, comments, or threats are welcome P.S. thanks for the great comments on the LRFD-USD topic Eric and Linda Johnston 98768299@mail.wsu.edu