Design Example Of Ribbed Mat Foundation Pdf

Compensated foundation the net pressure increase in the soil under a mat foundation can be reduced by increasing the depth d f of the mat.

Design example of ribbed mat foundation pdf. Reinforced ribbed mat slabs 1. For example the flat slab analogy which has been very successfully used in many cases has also led to structural failures in many other cases due to lack of understanding of the basics. A mat foundation also may be used to resist hydrostatic pressures or to bridge over small soft spots in the soil provided the mat is adequately reinforced. The bearing capacity increased by combining all individual footings in to one mat since bearing capacity is proportional to width and depth of foundations.

The properties used in the analysis and the design of this raft foundation are shown in table 4. Example 8 3 4 see example 8 3 4 in textbook page 363. Chapter 5 introduces the design steps for both a post tensioned ribbed mat foundation and a mild reinforced ribbed mat foundation. For the purpose of this document rrms is defined as a system of stiffening beams and slab constructed of.

Mat or raft foundation is a large concrete slab supporting several columns in two or more rows. Although mat foundations are more difficult and more costly to design than individual spread footings they can be used effectively. Design of raft foundation page 13 3 3 0 why raft should be used. This foundation will be used for a loose sand soil.

Additionally the design steps list the soil properties that are needed to complete the design and also the appropriate analysis procedures used for both methods. This document provides guidance for the design and construction of conventionally reinforced ribbed mat slab rrms foundation systems. This approach is generally referred to as the compensated foundation design and is extremely useful when structures are to be built on very soft clays. For a successful design the layout of mat foundation should be carried out with due consideration of both settlements and bearing capacity.