Location: California, USA
The objective of the work is to suggest restraints to limit equipment movement and to keep the equipment captive during an earthquake loading. Seismic restraints are not designed to reduce the forces transmitted to the restrained equipment. Instead, the focus is to properly design and install seismic restraints which have necessary strength to withstand the imposed forces. These calculations also check strength of the equipment flange and attachment location to be able to remain attached to the restraint, however no calculations or design are done to ensure that the equipment will be in working condition during a seismic event.
The calculations are done to accommodate the seismic forces on the structure as per UBC (Uniform Building Code) -1997. Apart from UBC-1997, seismic guidelines from FEMA (Federal Emergency and Management Agency) 412 & 413, BS 5950 are also considered during the design.
1) Non-Linear Structural analysis for Seismic Design
2) Wind Load Analysis
3) Buckling Analysis
4) Fatigue Analysis
5) Normal Modal Analysis to determine the natural frequencies.
6) Linear Static analysis
7) Selection of isolators, pads and inertia bases for equipments
8) Suggest Seismic Restraints i.e Brace/Mounting Brackets/Hangers/Anchor Bolts for all Pipelines and Equipments as per applicable Building code like UBC, IBC code
9) Seismic Restraining of Equipments
10) FEA analysis to study Vibration response of an equipment and its foundations
11) Response Spectrum Analysis
12) Provide Design Modification
13) Screw Calculations
14) Weld and Anchor Calculations
15) Calculation of Maximum Deflections due to seismic