Abstract:
Mat foundation is widely used for high-rise buildings where presence of shear wall is
very common. But the available analysis and design methods do not properly focus on
the effect of shear wall on the behaviour of mat foundation. Shear Wall resists a major
portion of the lateral load of high-rise buildings. So, presence of shear wall on mat
foundation causes significant change in pattern and intensity of loading on mat
foundation. Proper understanding of shear wall effect on mat foundation has not been
duly addressed in the past. This gap in knowledge brings some uncertainty in analysis
of mat foundation and may result in its over design or unsafe design. For economy in
design of mat with shear wall requires comprehensive understanding of the influence
of shear wall on mat. This work involved an extensive investigation of shear wall
effect on mat foundation using finite element program, ANSYS, Effects of different
locations and different numbers of shear walls have been studied.
A parametric study has been made in order to identitY the sensitivity of some
parameters for the presence of shear wall on mat. Variation in response of different
parameters to shear wall loading has been compared with past parametric studies of
mat without shear wall.
Non-uniform thickness of mat has received some attention among design engineers
for economy. Shear Wall effects on both uniform and non-uniform thickness have,
therefore, also been studied. For non-uniform mat analysis, the configuration
suggested by Rahman and Morshed has been followed.
Shear wall presence on mat foundation has significant effect on the behaviour of mat
in some cases. Presence of shear wall on edge of mat foundation has been found to be
very significant. Behaviour of mat foundation with and with out shear wall has been
compared. Based on the type and magnitude of variation, design recommendations for
mat foundation with shear wall have been suggested.
