The design and detailing requirements for special reinforced concrete shear walls have undergone significant changes from aci 318 11 to aci 318 14.
Ordinary reinforced concrete shear wall.
However these older shear walls were typically designed for combined actions of gravity loads and wind loading.
Ordinary reinforced masonry shear walls ordinary reinforced masonry shear walls which are designed using reinforced masonry procedures rely on the reinforcement to carry and distribute anticipated tensile stresses and on the masonry to carry compressive stresses.
The changes are a result of the unsatisfactory performance of many shear walls in the chile earthquake of 2010 and the christchurch new zealand earthquake of 2011.
A structural reinforced concrete shear wall in a 5 story building provides lateral and gravity load resistance for the applied load as shown in the figure below.
Two possible seismic resisting systems using reinforced concrete are moment frames and shear walls.
The prescriptive seismic detailing requirements for each of three reinforced masonry shear walls types ordinary intermediate and special are explained with particular attention to special reinforced shear walls.
In asce 7 10 table 12 2 1 two types of shear walls can be used ordinary reinforced concrete shear walls and special reinforced concrete shear walls what is it the difference between these walls.
Both the design for overturning and the design for shear are explained.
21 1 of aci 318 for ordinary reinforced concrete structural walls.
Detailed plain concrete shear walls are walls conforming to the requirements for ordinary plain concrete shear walls and shall have reinforcement as follows.
Figure 1 reinforced concrete shear wall geometry and loading.
Shear wall section and assumed reinforcement is investigated after analysis to verify suitability for the applied loads.
Vertical reinforcement of at least 0 20 square inch 129 mm 2 in cross sectional area shall be provided continuously from support to support at each corner at each side of each opening and at the ends of walls.
Reinforced concrete shear walls have long been recognized as suitable structural systems providing both lateral resistance and drift control in rc buildings.
5 bars required by.
Although such walls contain some reinforcement the msjc also mandates prescriptive reinforcement to ensure a minimum level of performance during a design level earthquake.
The continuous vertical bar required beside an opening is permitted to substitute for one of the two no.
The design process is illustrated with examples.
Precast walls can be used however they will not be addressed in detail in this lecture.
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