ASD and LRFD Major Differences
•Load Combinations and load factors
•ASD results are based on the stresses and LRFD results are based on the forces and moments capacity
•Static analysis is acceptable for ASD but nonlinear geometric analysis is required for LRFD
•Beams and flexural members
•Cb computation
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ROBINSON company is a leader company in seismic isolation in New Zealand.
there is 23 documents , which covers :
brochures
Dampers (LED +PVD +RVD )
Isolators (LRB + roglider + sliders)
Private Note:
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This specification consists of the design and verification of the bearing design properties, manufacture, assembly, testing, supply, and delivery of the isolation system.
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ISOLATOR INSTALLATION SEQUENCES
WITHOUT RETROFIT
a) Form and reinforce column.
b) Position Template Type 1 and fix securely (Sketch 7).
c) Pour concrete to 25mm below underside of plate.
d) Remove Template Type 1.
e) Position bearings on 25mm steel shims (Sketch 8).
f) Grout base of bearing using Conbextra flowable grout with a “flow-through”
technique. Allow to cure (Sketch 9).
g) Cast beams on top of bearings (Sketch 10).
h) Tighten nuts to top and bottom plates.
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ISOLATOR INSTALLATION SEQUENCES
WITH RETROFIT
a) Form and reinforce column (or base structure).
b) Position template and fix securely (Sketch 11).
c) Pour concrete to 25mm below underside of plate.
d) Cast upper beams on top of template (Sketch 12).
e) Leave falsework for beams and slab in place.
f) Remove template (Sketch 13).
g) Apply paintable type epoxy to topside of upper bearing plate. Bolt bearing to
underside of upper beams. Securely tighten bolts (sketch 14).
h) Grout base using Conbextra flowable grout with “flow through” technique.
Allow to cure (Sketch 15).
i) Tighten nuts to lower plate.
j) Remove propping and false-work.
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MIN company is a leader company in seismic isolation in Japan.
there is 1 document , which covers :
THK Base Isolation Catalog - Technical Book
Code:
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MIN company is a leader company in seismic isolation in Singapore.
there is 7 documents , which covers :
ELASTOMERIC BEARING STRIPS
LAMINATED ELASTOMERIC BEARINGS
mechanical pot bearings
PLAIN ELASTOMERIC BEARINGS
PTFE Sliding Bearing catalogue
Stainless Steel Pot Brg catalogue_W
STRUCTURAL SEISMIC RUBBER BASE ISOLATION BEARINGS
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GERB company is a leader company in seismic isolation in Germany.
there is 1 documents , which covers :
Spring Units , with and without Damping , Load Capacity of up to 57 KN
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freyssinet company is a leader company in seismic isolation in UK (England).
there is 6 documents , which covers :
natural rubber bearing pads
General catalogues
Special bearings to BS5400
Tetron Disk bearings
Tetron Spherical bearing
Code:
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FIP company is a leader company in seismic isolation in Italy.
there is 2 documents , which covers :
LRB Isolators.
Code:
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