Reinforced Concrete Mat Foundation Design

Seismic design of reinforced concrete mat foundations has advanced significantly in the last twenty years.

Reinforced concrete mat foundation design. Basic design criteria concentrically loaded d 2 all sides c critical section for two way shear b critical section for one way shear a critical section for flexure outside face of concrete column or. For analysis the mat is divided into mutually perpendicular strips. Nehrp seismic design technical brief no. 4 3 approximate plate analysis.

The method is generally applicable where columns are more or less equally spaced. A waterproof membrane sheet is placed over the ground surface and then 4 pcc is poured to create a level base for the mat raft foundation. Why mat is used. A mat foundation is a thick reinforced concrete slab supporting arrangements of columns or walls in a row or rows and transmitting the loads to the soil.

Where the differential settlement between columns will be small design the mat as reinforced concrete flat slab assuming planar soil pressure distribution. 7 seismic design of reinforced concrete mat foundations. Spmats program uses the finite element method for the structural modeling and analysis of reinforced concrete slab systems or mat foundations subject to static loading conditions. A discussion is presented.

It can model analyze and design any combination of two way mat raft slabs individual footings pile caps or grade beams. As analytical capabilities have improved primarily in the form of finite element analysis the mathematical modeling of these continuous structural elements has led to seemingly more precise designs. Adapt mat is a versatile three dimensional 3d finite element fem analysis and design software for any configuration of conventionally reinforced or post tensioned foundation system. After the pcc reinforcement steel bars are tied cage in place and then the desired thickness of the concrete according to the design is poured.

Seismic design philosophy for ductile precast concrete frames is discussed. The difference between strong connection and ductile connection precast design is defined.