5. Lateral Shear Resistance
Where existing walls lack sufficient shear strength to resist seismic loading, a traditional reinforced shotcrete method may be utilized to increase the in-plane shear strength of URM structures. Although effective, this method takes up space and adds a lot of weight to the structure which increases the seismic load on the structure. An option for increasing the in-plane shear strength of the URM wall assembly, without significantly increasing the structure weight and adding to the seismic demand, is to utilize Fiber Reinforced Polymer (FRP) material.
Special detailing is required when attaching an impermeable element, such as FRP, to a porous URM wall.
Another option is to use Fabric-Reinforced Cementitious Matrix (FRCM). FRCM consists of a carbon grid which is adhered to the existing wall with a cementitious matrix. Although installation is similar to shotcrete, the layers are much thinner and no rebar is required resulting in a quicker and lighter installation.
In areas where there is little wall space (such as retail frontage with large openings), one should consider the installation of a Special Moment Frame (SMF). These frames can be designed to resist large forces and have minimal impact on open space.
Lateral Shear Resistance Gallery
- In-Plane Lateral Resistance Strengthening with FRP
- In-Plane Lateral Resistance Strengthening with FRCM
- In-Plane Lateral Resistance Strengthening with Reinforced Concrete Shear Wall
- In-Plane Lateral Resistance Strengthening with Concrete or CMU Infill
- In-Plane Lateral Resistance Strengthening with Steel Special Moment Frame
