Download - Seismic Effect on TMP Support
-
8/2/2019 Seismic Effect on TMP Support
1/13
Seismic Analysis of
TMP Support
ByDheeraj Kumar Sharma
(IPR)
-
8/2/2019 Seismic Effect on TMP Support
2/13
Problem
The height of the TMP support is increased by 330mm. Hence, this is the assessment of
seismic event on the increased height of TMP Support.
Figure describes the position of the equipment in the lab wrt vessel.
BOLTED
SIMPLY
RESTING ON
RUBBER PADS
(and hence on floor)
14.5m
7m
TMP
vessel
-
8/2/2019 Seismic Effect on TMP Support
3/13
Assumptions:
As the task could be difficult for calculating (manually) simultaneously the seismic effect ofvessel on TMP support as well as seismic effect on TMP itself. Hence for simplifying the problem
few assumptions are considered:
1. The vessel is considered as the rigid part and its considered that it will not deform
at the time of earthquake as our objective is not to analyze the vessel for earthquake. It means
that anchor bolts of vessel are rigid enough and wont get deformed at the time of earthquake.
2. Hence the only load that will be acting on the legs is the weight of TMP.
3. However in the case of rigid vessel-elbow-TMP connection, vessel will not allow TMP
to move but in analysis, it is considered that the TMP deflects because of the horizontal force
caused by earthquake. Hence its a conservative approach to calculate the stress on legs.
4. As the CAD model or the information about the inner part is not available hence the
CG of the TMP is considered at the mid of the TMP as shown in fig.
-
8/2/2019 Seismic Effect on TMP Support
4/13
Seismic analysis of non structural components is provided in IS 1893(part 1) and IBC 2006.
But in below mentioned calculations, Fp (seismic horizontal force) is calculated according
to IS 1893(part1).
Different factors used in the calculations are taken from the tables mentioned in IS (1893).
The applied approach is static in nature and conservative.
Few Words Before Calculations
-
8/2/2019 Seismic Effect on TMP Support
5/13
support
CG
-
8/2/2019 Seismic Effect on TMP Support
6/13
-
8/2/2019 Seismic Effect on TMP Support
7/13
-
8/2/2019 Seismic Effect on TMP Support
8/13
3 3=215kN (For Aluminium
(E=69GPa,
For Al.)
(From
MATWEB)
-
8/2/2019 Seismic Effect on TMP Support
9/13
Conclusion
Hence, from the calculations, we can see that the amount of stress coming onTMP supports (1.92MPa in shear and 0.9MPa in compression ) is very less as compared
to the allowable strength of the material ,26MPa, at room temperature.
(allowable strength for Aluminium is 2/3Sy or 1/3Su whichever is minimum )
-
8/2/2019 Seismic Effect on TMP Support
10/13
References:
1. Formula for assessing the horizontal seismic load is taken from IS 1893.
3. Other dimensions of TMP and TMP support are taken from manual of the equipment.
-
8/2/2019 Seismic Effect on TMP Support
11/13
Thank You
-
8/2/2019 Seismic Effect on TMP Support
12/13
Definitions
Amplification factor
The component amplification factor (ap) represents the dynamic amplification of the
component relative to the fundamental period of structure. In most situations, the
non-structural element may need to be designed without fundamental period of the
structure being available. Further, one may need to carry out experimental studies
(e.g., shake table study) to evaluate fundamental period of the non-structuralelement which may not be feasible.
Component response modification factor
The component response modification factor (Rp) represents ductility, redundancy,
and energy dissipation capacity of the element and its attachment to the structures.
Importance factor
Importance factor is determined according to the importance of the structure.For
highly important structures such as hospitals, schools, emergency buildings,
structures containing hazardous materials etc the value of Ip is 1.5 otherwise it is 1.
Additional Information
-
8/2/2019 Seismic Effect on TMP Support
13/13
Zone factor
According to the seismic zones ,zone factor is decided . There are I to V seismic zones
defined . Ahmedabad comes in the seismic zone III.