The Tilt-Up Buildings are referred to as Non-Ductile Concrete Buildings, mostly one or two story, where the exterior walls consist of concrete panels and the roof and floor diaphragms are wood members.
The popularity of this kind of building is because the construction cost is low with the sub-standard roof system. They mostly serve as warehouses or industrial buildings. Recently due to architectural influence you observe the tilt up buildings as office buildings, car dealerships, wholesale stores such as Costco, Wall-Mart, etc.
The tilt up buildings which were constructed prior to 1976 can be categorized as non-ductile concrete buildings which are subject to seismic retrofitting in most cities in Southern California.
The seismic retrofitting of these types of buildings are a straight forward procedure. Since the concrete walls are attached to the slab on grade and the foundation, therefore it is necessary to tie the top of the wall to floor and roof diaphragms. This can be achieved by anchoring the concrete walls to floor or roof diaphragm and also tying the opposite walls together thru the floor and roof systems.
The cost of retrofitting is low. It is actually based on the number of connections at the ceiling level. You can average the price of the retrofitting between $2.50 to $4.00 per square foot for one story building. The more square the building, the less the construction cost may be.
The construction can be done while the building is occupied. There is no need for relocation of the tenant for seismic retrofitting. The connections can be done under the roof at the ceiling line. There is no need to disturb the roofing materials.
Consult with a Structural (Seismic Retrofit) Engineer for proper design and Value Engineering and avoid the need a for plywood diaphragm nailing check which would disturb the roof.