Reinforced Concrete Mat Foundation Design

The difference between strong connection and ductile connection precast design is defined.

Reinforced concrete mat foundation design. 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. 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. 7 seismic design of reinforced concrete mat foundations. For analysis the mat is divided into mutually perpendicular strips.

A discussion is presented. 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. 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. It is used to support storage tanks industrial equipment silos chimneys and various tower structures.

Seismic design philosophy for ductile precast concrete frames is discussed. A guide for practicing engineers published august 15 2012 author s ron klemencic ian mcfarlane neil hawkins. 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. 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.

Nehrp seismic design technical brief no. 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. 4 3 approximate plate analysis. Why mat is used.

The slab is idealized as a mesh of rectangular plate finite elements with four nodes at the corners and three degrees of freedom dz rx and ry per node. The method is generally applicable where columns are more or less equally spaced.