Vol. 9,No. 2, issue 6

Diyala Journal of Engineering Sciences DJES

Volume 9, No. 2, Pages: 27-37, June 2016

(Received: 20/10/2014; Accepted: 28/4/2015)

THE ANALYSIS BEHAVIOUR OF ARCHED STRIP FOUNDATIONS

Mohammed Ahmed Elaiwi Al- Hamdani

Building and Construction Engineering Department, University of Technology, Baghdad

DOI:https://dx.doi.org/10.24237/djes.2016.09206

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ABSTRACT

The construction of bearing walls structures does not necessarily require for using plane strip reinforce concrete footings. These structures can construct by using present simple arched plain and reinforced concrete strip footings on silty clay and silty sand soil using finite element. This paper aims at analyzing plain and reinforced concrete arched strip footings, as foundation system of bearing walls structures, as an alternative solution to the construction of buildings. The effect of soil type, arched strip footing's height and the bearing walls vertical load on the dimensions and capacity of arched strip footings study in this paper. A numerical model for the non-linear analysis of arched strip footing-soil interaction problem based on the finite and infinite element implement. A computer program develops to model the arched strip footing-soil installation. The material and geometrical non-linearity of the concrete strip footing takes into account the non-linear stress-strain relation of concrete and presence for cracking also considers. In addition, Duncan-Mohr-Coulomb Modified model uses to simulate soil non-linearity. The obtained numerical results were compared with the traditional method in designing of strip footings commonly used by structural engineers.

Design charts propose and presented for structural designers in order to calculate arched P.C & R.C strip footing dimensions according to type of soil and vertical load such strip footings which consider the cost less than traditional bearing walls construction system. The thickness of strip footing expresses in a non-dimensional ratio (t/B), where (B) is the breadth of the strip footing, with three ratios of 0.1, 0.2, and 0.3 respectively. The height of the arched strip footing was expressed in a non-dimensional form (h/B) with three ratios of 0.1, 0.2 and 0.3 respectively. Four different values of vertical load (P = 20t/m', 30t/m', 40t/m' & 50t/m') investigate in the analysis. Two types of soil; silty clay, and silty sand consider in this study to represent the cases of weak and stiff soil. This result leads to exceptionally low cost up to 30% and safe structures than in case of plane strip footing. The present investigation shows some results that the minimum etc.

Keywords: Plain and reinforced concrete, Arched Strip footing, silty clay and silty sand soil, Nonlinear - Finite element

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