How can we avoid soft story effect?

In case it is necessary, irregularities can be eliminated by increasing the lateral rigidity of this storey by putting up additional walls between single structural elements on the soft storey; placing diagonals between the columns and shear walls; increasing the rigidity of the soft storey by increasing beam-column …

How do you calculate the stiffness of a story?

First, obtain the inverse of the angle of the inter-story deflection, at each story level, and then compute the numerical average of of all the stories above grade, . The value at each story level is divided by the value, and the result is defined as the stiffness ratio.

Which is better staad or ETABS?

Etabs is better. ETABS is good over STAAD PRO if you are designing a reinforced concrete structure. The user interface is easy and the analysis values of RC structures are better and we get economical steel data from etabs compared to that of staad pro.

What is weak story?

Discontinuity in capacity—weak story: A weak story is one in which the story strength is less than 80% of that in the story above. The story strength is the total strength of all seismic-resisting elements sharing the story shear for the direction under consideration.

What is weak story building?

Weak story configuration is often generated in hotel and hospital buildings, in which not only the first floor is designed less walls than the other floors, but generally, do to its importance, it also has a greater height than the rest of the floors.

What is difference between weak storey and soft storey?

The deficiency that usually makes a storey weak is inadequate strength of frame columns. A soft storey is one in which late al stiffness is less than 70% of that in the storey immediately above, or less than 80% of the combined stiffness of the three stories above.

What causes soft storey?

A soft storey has inadequate shear resistance or inadequate ductility ( energy absorption capacity) to resist earthquake induced building stresses. Usually the location of soft storey is at ground floor of building. Soft storey buildings are characterized by having a storey which has a lot of open space.

How do I check my base shear in Etabs?

Matching base shear in Etabs 2016

1. Define Load cases spec x Modify/show cases Fig-1 Spec y Modify/show cases Fig-2.
2.  After modifying the scale factor now run the model Fig-3  After run analysis go for DISPLAY SHOW TABLES STRUCTURE RESULTS STOREY FORCES EXPORT TO EXCEL.
3. Fig-4 Fig-5.
4. Fig-6.

How do you increase the stiffness of a structure?

1. Central Core. The stiffness of buildings can be increased substantially through the construction of central core.
2. Shear Walls. Shear wall is a structural member used to resist lateral forces.
3. Braced Frame.
4. Tube system.
5. Double Tube System.

Who invented ETABS?

Ashraf Habibullah