Table of Contents
What is pseudo-static loading?
In the pseudo-static analysis, the peak ground acceleration is converted into a pseudo-static inertia force and applied as a horizontal incremental gravity load.
What is pseudo-static method?
In the pseudo-static method, the seismic loading is modeled as a statically applied inertial force, the magnitude of which is a product of a seismic coefficient k and the weight of the potential sliding mass.
What is Pseudostatic?
In their most common form, pseudostatic analyses represent the effects of earthquake shaking by pseudostatic accelerations that produce inertial forces which act through the centroid of the failure mass. The results of pseudostatic analyses are critically dependent on the value of the seismic coefficient.
What is the formula for seismic coefficient?
The seismic coefficient represents the maximum horizontal equivalent acceleration (¯ah. max. m a x ) expected in a failure wedge in slip potential and is obtained by averaging the horizontal (instantaneous) forces in the deformable sliding mass, according to the equation: kmax=¯ah. max/g=max¯ah(t)=max(H∑z=0m(z)ah(z,t.
What is seismic coefficient CA?
The seismic coefficients, Cv and Ca are measures of the expected ground acceleration at the site.
What is pseudo dynamic?
The pseudo‐dynamic testing procedure is a simultaneous simulation and control process in which inertia and damping properties are simulated and stiffness properties are acquired from the structure.
How is seismic load measured?
After earthquake zone has been identified, the following steps are followed:
- Calculate design horizontal seismic coefficient, Ah, which is given by (cl.
- Calculate design seismic base shear for the structure (VB).
- Now calculate the distribution of design forces on the structure.
What is seismic zone factor Z?
The area in which a building is located has: a low seismic risk if the area has a Z factor that is less than 0.15; and. a medium seismic risk if the area has a Z factor that is greater than or equal to 0.15 and less than 0.3; and. a high seismic risk if the area has a Z factor that is greater than or equal to 0.3.
How do you calculate effective seismic weight?
We should determine the total area of the floor, then determine the total seismic weight per square foot, and finally multiply them to get the answer. Step 2: Dead Loads. 6” concrete = (6/12)’ x 120pcf = 60psf. Answer: The effective seismic weight for the floor is 62.4 kips.
How is SS and S1 calculated?
The GSHAP values are multiplied by 2 to approximate 2%-in-50-year PGA values, and then multiplied by 2.5 and 1.0, respectively, to estimate SS and S1.
What is CS in seismic design?
Cs = seismic response coefficient determined in Section. 12.8.1.1 and 19.3.1 (dimensionless)
Does seismic weight include live load?
11) Effective Seismic Weight [12.7. 2] defines the effective seismic weight, W. Except for as mentioned below, live load is not included in the inertial force; however, the seismic force is later combined with dead and live loads in the load combinations.