What is earthquake time period?
The time taken by the wave to complete one cycle of motion is called period of the earthquake wave. In general, earthquake shaking of the ground has waves whose periods vary in the range 0.03-33sec. Even within this range, some earthquake waves are stronger than the others.
What is the difference between Etabs and staad?
Etabs is better. ETABS is good over STAAD PRO if you are designing a reinforced concrete structure. STAAD PRO is good over ETABS for the analysis of steel structures frames as the codes and user interface is better integrated in staad pro.
How do you calculate the time period of a building?
Tn =2π√(m/k) where,
- Tn is a natural period of building.
- m is mass.
- k is stiffness.
What are the different types of seismic analysis?
Three basic methods are available for analyzing the responses of a structure subjected to seismic ground wave: Static analysis. Response spectra analysis. Time history analysis.
What is time period in Etabs?
Time period formula as per IS codes relates overall height of the building and the base dimension of the building. Time period plays an important role in design of earthquake resistant structures.
What determines the duration of an earthquake?
The duration of an earthquake is related to its magnitude but not in a perfectly strict sense. So the larger the area of the fault that ruptures, the longer the duration of the earthquake. And larger magnitude earthquakes have larger fault areas. So there is a general relationship between duration and magnitude.
How do you calculate the time period of building in Etabs?
As per the formula provided in IS code (IS 1893(part1):2002), the time period value obtained, . = 0.7475 sec Where h=height of the building in the model provided h=21.45m The above calculation is done manually just considering the overall height of the building.
What is natural time period and frequency?
Period refers to the time it takes something to happen. Frequency is a rate quantity. Period is a time quantity. Frequency is the cycles/second. Period is the seconds/cycle.
Why seismic analysis is important?
Seismic hazard analysis is important in coming up with a reliable risk assessment. Seismic hazard analysis is principally used to produce seismic hazard maps. These maps provide important information used in putting in place mitigation measures against the effects of destructive earthquakes.
What are the parameters we considered in seismic analysis in Etabs?
A study is done to carry out seismic analysis of multi-storied buildings using ETABS. The different parameters taken are mass irregularity, different building shapes etc. As storey number decreases, torsion irregularity coefficients increases[2].
How precise are the results from ETABS?
And, if you are referring for code-specified analysis, the results from Etabs are very precise. 1) Approximate: Calculate the approximate period, T, based on the formula discussed in various codes, such as Section 7.6.1 of IS:1893 Code where the period is calculated using the following equations:
How does ETABS calculate the period of a building?
The manual calculation is approximate. Etabs uses the actual mass and stiffness of your model to calculate the period of the building, hence more closer to the reality. 8 clever moves when you have $1,000 in the bank.
What is the difference between ETABS 2017 and is 1893?
The time period (the one-story model of the structure is below) calculated manually by using the equation in IS 1893: 2016 is 0.170963 and that given by Etabs 2017 is 0.171 (highlighted in the picture below). If we round off the result from the manual calculation to three digits, after decimal, the results are exactly equal.
What is the importance of time period in seismic assessment?
Time period plays an important role in estimating the lateral loads and hence contributes to the seismic assessment of a structure. Time period depends on mass and stiffness. Based on the time period which is purely dependent on stiffness and mass, the behaviour of building under lateral loads can be evaluated.