Earthquake Masonry Wall To Concrete Floor Slab

Flexible floor slabs are commonly used to connect different cantilever masonry walls.

Earthquake masonry wall to concrete floor slab.

In effect this cracked mortar bed joint becomes a slip joint with questionable resistance against horizontal earthquake shear forces. The walls of this type of masonry are confined by concrete tie beams and tie columns to ensure satisfactory earthquake performance. The walls in the confined masonry act as the bracing panels which resist horizontal earthquake forces. Masonry walls transmit the gravity load from the slab s above down to the foundation.

The walls act as bracing panels which resist horizontal earthquake forces. And they act to support the walls from out of plane loads. It is much easier than one might expect. For example it is recommended to use flexible floor slabs to joint different cantilever masonry walls rather than employing rigid coupling beams.

These houses do not have crawl spaces and cripple walls. 2002 for calculating earthquake forces b indian concrete code is 456 2000 for design of rc members and c ductile detailing code for rc structures is 13920 1993 for detailing requirements in seismic regions. The walls must be confined by concrete tie beams and tie columns to ensure. Some homes are built directly on concrete slabs.

Nearly all homes with slab foundations that were originally built to code will have anchor bolts or straps. Though this is a task that is more complicated than simply laying new block on the slab as it requires a higher level of thought and preparation. The second floor diaphragm with concrete topping is assumed to act as a rigid diaphragm and distributes the earthquake load to the walls in proportion to their stiffness. Floor and roof systems for use with loadbearing structural concrete masonry walls serve three primary functions.

They function as diaphragms transmitting lateral wind and seismic loading through the walls to the foundation. However if the house is not bolted to the slab you have an earthquake weakness. Masonry foundations are common throughout the united states and around the world. At the brick wall to floor slab interfaces which will result in cracking of the brick walls at adjacent mortar bed joints.

Roles of floor slabs and masonry walls. Providing a conventional slip joint metal strips with grease. They transmit the vertical dead load and live load to the bearing walls. Unfortunately these foundations are liable to break and collapse during an earthquake.

The addition of concrete block to an existing concrete pad is a situation that will most commonly come up during a remodeling project. The engineer should confirm these assumptions by comparing the in plane deflection of the diaphragms to the lateral displacement of the walls.