||Opens the Seismic Parameter
dialog, which is used to populate the parameter fields with appropriate
values for the IS 1893 - 2002 code based on a more simplified set of general
|Include IS 1893 Part 4
(IS 1893 - 2002/2005 only) Set this option to
specify loads per IS 1893 (Part 4) 2005 for industrial or stack-like
structures. When set, the a value for ST is required (1
5). When set and ST of
5 is used, CV and DV are also required.
If this check
box is clear, then IS 1893 (Part 1) 2002 is used.
||Seismic zone coefficient. Refer
to Table 2 of IS:1893 (Part 1)-2002.
|Response reduction Factor (RF)
||Response reduction factor. Refer
Table 7 of IS: 1893 (Part 1) -2002 or Table 3 of IS: 1893 (Part 4) -2005.
|Importance factor (I)
||Importance factor depending upon
the functional use of the structures, characterized by hazardous consequences
of its failure, post-earthquake functional needs, historical value, or economic
importance. Refer Table 6 of IS: 1893(Part 1)-2002 or Table 2 of IS: 1893 (Part
|Rock and soil site factor (SS)
Rock or soil sites factor. Depending on type of
soil, average response acceleration coefficient Sa/g is calculated
corresponding to 5% damping. Refer Clause 6.4.5 of IS: 1893 (Part 1) -2002 or
Clause 8.3.2 of IS: 1893 (Part 4) -2005.
- 1 = hard soil
- 2 = medium soil
- 3 = soft soil
site conditions. If both parameters are specified,
|Type of structure (ST)
For IS 1893 Part 1, the program will calculate natural period as per
Clause 7.6 of IS:1893(Part 1)-2002.
- 1 = RC frame building
- 2 = Steel frame building
- 3 = All other buildings
For IS1893 Part 4, the program will calculate period as per Clause
14.1 of IS:1893(Part 4)-2005 for stack-like structures. For Category 1
Industrial Structures base shear is calculated as twice the base shear of other
structures as per Clause 8.3 of IS:1893(Part 4)-2005.
- 1 = Category 1
industrial structure (Part 4)
- 3 = All other
- 5 = stack-like
parameter is optional for Part 1, but is required for Part 4.
|Damping ratio (DM)
||Damping ratio to obtain
multiplying factor for calculating Sa/g for different damping. If no
damping is specified 5% damping (default value 0.05) will be considered
corresponding to which multiplying factor is 1.0. Refer Table 3 of IS:1893(Part
damping. If both parameters are specified,
This should be a value between 0 (zero) and 1.0, inclusive. For example, 7% damping should be specified as 0.07.
|*Period in X Direction (PX)
||Optional period of structure (in sec) in X
direction. If this is defined this value will be used to calculate
Sa/g for generation of seismic load along X direction.
|*Period in Z Direction (PZ)
||Optional period of structure (in sec) in Z direction. If this is defined this value will be used to calculate Sa/g for generation of seismic load along Z direction.
|Depth of Foundation (DT)
||Depth of foundation below ground level. It should
be defined in current units. If the depth of foundation is 30 m or more, the
value of Ah is taken as half the value obtained. If the foundation
is placed between the ground level and 30 m depth, this value is linearly
interpolated between Ah and 0.5Ah.
to specify foundation depth. If both
parameters are specified, DT
|*Ground level (GL)
||Y coordinate of ground level. A reduced lateral force is applied to
levels below this height, per Clause 6.4.4.
|*Spectral acceleration (SA)
||Average response spectral
acceleration coefficient corresponding to site specific spectra.
|*Multiplying factor for SA (DF)
||Multiplying factor for
||Coefficient as given in Table 6
of IS:1893(Part 4)-2005. Valid only for stack-like structures for calculating
fundamental time period per Cl. 14.1.
|*Area of cross-section (AX)
||Area of cross-section at the
base of stack-like structures for calculating fundamental time period per Cl.
14.1 of IS:1893(Part 4)-2005.
|*Modulus of elasticity (ES)
||Modulus of elasticity of
material of stack-like structures for calculating fundamental time period per
Cl. 14.1 of IS:1893(Part 4)-2005.
|*Coefficient of shear force (CV)
||Coefficient of shear force given
in Table 6 of IS:1893(Part 4)-2005. Required for stack-like structures (ST 5).
|*Distribution factor (DV)
||Distribution factor for shear
force given in Table 11 of IS:1893(Part 4)-2005. Required for stack-like
structures (ST 5).