Earthquake Masonry Wall To Concrete Floor Slab

Masonry walls transfer the loads of the upper slabs to the foundation successfully.

Earthquake masonry wall to concrete floor slab. And they act to support the walls from out of plane loads. Floor and roof systems for use with loadbearing structural concrete masonry walls serve three primary functions. For example it is recommended to use flexible floor slabs to joint different cantilever masonry walls rather than employing rigid coupling beams. However if the house is not bolted to the slab you have an earthquake weakness.

The addition of concrete block to an existing concrete pad is a situation that will most commonly come up during a remodeling project. The walls of this type of masonry are confined by concrete tie beams and tie columns to ensure satisfactory earthquake performance. Nearly all homes with slab foundations that were originally built to code will have anchor bolts or straps. They function as diaphragms transmitting lateral wind and seismic loading through the walls to the foundation.

The walls in the confined masonry act as the bracing panels which resist horizontal earthquake forces. At the brick wall to floor slab interfaces which will result in cracking of the brick walls at adjacent mortar bed joints. Some homes are built directly on concrete slabs. Roles of floor slabs and masonry walls.

They transmit the vertical dead load and live load to the bearing walls. Masonry walls transmit the gravity load from the slab s above down to the foundation. It can be used to resist seismic loads if necessary measures are considered. Flexible floor slabs are commonly used to connect different cantilever masonry walls.

The engineer should confirm these assumptions by comparing the in plane deflection of the diaphragms to the lateral displacement of the walls. Masonry foundations are common throughout the united states and around the world. In effect this cracked mortar bed joint becomes a slip joint with questionable resistance against horizontal earthquake shear forces. 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 act as bracing panels which resist horizontal earthquake forces. The walls must be confined by concrete tie beams and tie columns to ensure. These houses do not have crawl spaces and cripple walls. Providing a conventional slip joint metal strips with grease.

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. Unfortunately these foundations are liable to break and collapse during an earthquake.