CSI ETABS - 03 - Load Pattern (Gravity Loads + Earthquake (seismic) Loads | Part 3
In this lecture , Load patterns are defined for dead ,superdead, live and earthquake(seismic) loads.
LOAD PATTERN:
A load pattern is a set of forces, temperatures, displacements and other effects, which act on a structure. Each load pattern is assigned a design load type (DEAD, LIVE, SNOW, WIND, QUAKE, etc.) which classifies the simulate the real computational requirements for structures. Designer can define as many as he required for the design of structures.
--) Add New Load Pattern button.
Step-1: Type the name of the load pattern in the Load Pattern Name edit box.
Step-2:Select a load pattern type from the Type drop-down list.
Note (i): Self Weight Multiplier
The self-weight multiplier controls whether or not structural self-weight is included within a given load pattern. Typically, a self-weight multiplier of 1.0 is only assigned to the load pattern which represents the self-weight of the structure and multiplier of zero is assigned to all other load patterns.
Note (ii): If the load Type specified is Quake, Wave or Wind, select an option from the Auto Lateral Pattern drop-down list.
Step-3:Click the Add New Load Pattern button. If the load pattern type specified is Quake, Wave or Wind, note the text for the Modify Lateral Load Pattern button.
--) For Seismic Load Pattern
Step-1:Direction and Eccentricity options. Choose to specify the X or Y direction of the seismic loading, or to specify the direction with a percentage of eccentricity that is applicable to all diaphragms. Use the Ecc Ratio (All Diaph) edit box to specify a value for eccentricity. Five percent is the default and is entered as 0.05.
Step-2:Story Range options. Choose the Top Story and Bottom Story to specify the elevation range over which the automatic static lateral loads are to be calculated. By default the bottom story is the base of the building and the top story is the uppermost level of the building.
Step-3:Factors options. Use these edit boxes to specify the Base Shear Coefficient and the Building Height Exponent, K.
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