Table of Contents
Why do we scale base shear in Etabs?
Hence, ETABS assumes that the response spectrum functions are unitless and that the scale factor converts them into the appropriate units. So the use of a scale factor equal to 9.81 can convert the response spectrum into acceleration (m/s2).
How do you scale in Etabs?
Scaling of Base Shear in ETABS
- An ETABS model should already be available for the project.
- Declare the static load cases in x- and y-direction.
- Define the Response Spectrum function.
- Define the mass source to be used in the seismic analysis specific to the project criteria.
How base shear is calculated using the equivalent static method?
In many seismic codes, the equivalent static lateral force V is used as a reference value of the total seismic design base shear. For instance, the base shear calculated using the modal response spectrum analysis should not be less than 80 \% or 90 \% of the equivalent lateral base shear.
Why do we scale base shear?
The requirement of a base shear scaling for the Response Spectrum Analysis (RSA) procedure is included in the building codes as a means to ensure that the minimum strength of a structure designed using the RSA procedure is similar to the strength that would be required if the structure was designed using the Equivalent …
How do you calculate base shear manually?
The base shear formula is: V = 0.2 (W) V represents the shear force that will be generated at the base of a building. 0.2 represents earthquake force. W represents the weight of the building.
What is base shear?
Base shear is an estimate of the maximum expected lateral force on the base of the structure due to seismic activity. It is calculated using the seismic zone, soil material, and building code lateral force equations (Figure 10.3). Proximity to potential sources of seismic activity (such as geological faults)
What is scale factor in dynamic analysis?
For Response Spectrum Analysis: The spectrum must be converted to the specific set of units used throughout the model by applying a scale factor given as the value of gravity acceleration in the current units of your model.
What is static base shear?
The lateral forces exerted on the structure by ground vibrations may be determined by the static or equivalent lateral force procedure (ASCE 2003a,b, ASCE 2000/FEMA 2000). Base shear is an estimate of the maximum expected lateral force on the base of the structure due to seismic activity.
What is dynamic base shear?
Base shear is an estimate of the maximum expected lateral force that will occur at the base of the structure due to the seismic ground motion. During the analysis, the codes required for the use of the equivalent static force procedure and a dynamic lateral force procedure.
How do you solve base shear?