Dual frame system in etabs according to asce-7-05
Dual frame system in etabs according to asce-7-05
(OP)
A dual system, is a structural system with the following essential features:
1. An essentially complete space frame provides support for gravity loads.
2. Resistance to lateral forces is provided by moment-resisting frames capable of
resisting at least 25 percent of the design base shear and by shear walls
(ASCE 12.2.5.1).
3. The two subsystems (moment-resisting frames and shear walls) are designed to
resist the design base shear in proportion to their relative rigidities
(ASCE 12.2.5.1).
to active the previous rules in etabs we have to make two models
the first model including all elements(slabs+beams+shear walls , etc) and apply all loads including all vertical loads + seismic loads + wind loads + etc...
the second model the shear walls should be removed and 25% of seismic loads obtained from the first model should be applied in the second model my question what is the type of vertical loads should be applied to the second model if any?????
and what is meant by the first rule in dual-frame system ( An essentially complete space frame provides support for gravity loads.)????
best regards.
1. An essentially complete space frame provides support for gravity loads.
2. Resistance to lateral forces is provided by moment-resisting frames capable of
resisting at least 25 percent of the design base shear and by shear walls
(ASCE 12.2.5.1).
3. The two subsystems (moment-resisting frames and shear walls) are designed to
resist the design base shear in proportion to their relative rigidities
(ASCE 12.2.5.1).
to active the previous rules in etabs we have to make two models
the first model including all elements(slabs+beams+shear walls , etc) and apply all loads including all vertical loads + seismic loads + wind loads + etc...
the second model the shear walls should be removed and 25% of seismic loads obtained from the first model should be applied in the second model my question what is the type of vertical loads should be applied to the second model if any?????
and what is meant by the first rule in dual-frame system ( An essentially complete space frame provides support for gravity loads.)????
best regards.





RE: Dual frame system in etabs according to asce-7-05
You define one section cut for base shear wall, and anothere one for base columns. After calculation you can estimate if the ratio for the base shear is in the proportion of 25% or above for the columns using the value obtained for section cut..If not you modify the section of columns and shear wall to aim this values.
RE: Dual frame system in etabs according to asce-7-05
RE: Dual frame system in etabs according to asce-7-05
consists of columns shear walls and flat slabs i want the columns to take all the shear force under seismic load case
(my specific question haw can i prevent the shear walls from carrying any amount of the shear forces?????
RE: Dual frame system in etabs according to asce-7-05
RE: Dual frame system in etabs according to asce-7-05
Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis
http://www.engissol.com/cross-section-analysis-des...
RE: Dual frame system in etabs according to asce-7-05