Shiraz University
Iranian Journal of Science and Technology Transactions of Civil Engineering
2228-6160
38
C2
2014
08
01
ANALYSIS OF THREE-DIMENSIONAL CONSOLIDATION OF UNSATURATED SOILS
485
493
EN
10.22099/ijstc.2014.2423
This study extends the theory of three-dimensional consolidation to unsaturated soils<br />and formulates the theory for finite element analysis by treating the pore water and pore air as a<br />mixed pore fluid. This formulation considers variations in the permeability and compressibility of<br />the mixed pore fluid with changes in the void ratio and degree of saturation. The compressibility of<br />the mixed pore fluid is derived using Boyle’s Law. An example of the settlement of a vertical<br />drain is investigated and discussed; this example demonstrates that the numerical analysis theory is<br />applicable and reliable. The results indicate that the rate of consolidation of unsaturated soils is<br />clearly slower than that of saturated soils, the rate of dissipation of the pore fluid pressure is<br />considerably slower, and the permeability of the mixed pore fluid decrease during consolidation.<br />This theory is applicable to unsaturated soils with high degrees of saturation and can be used to<br />obtain more reliable predictions of unsaturated soil consolidation.
Unsaturated soils,consolidation theory,pore fluid,finite element,vertical drain
http://ijstc.shirazu.ac.ir/article_2423.html
http://ijstc.shirazu.ac.ir/article_2423_01d99754ba3a8bcb1ab100827566152a.pdf
Shiraz University
Iranian Journal of Science and Technology Transactions of Civil Engineering
2228-6160
38
C2
2014
08
01
NEW CANONICAL FORMS FOR THE ANALYSIS OF SYMMETRIC TRUSS STRUCTURES
495
503
EN
10.22099/ijstc.2014.2424
For a symmetric structure the degrees of freedom (DOFs) in two sides of the axis of<br />symmetry can be either symmetric or anti-symmetric. If there is no active DOF on the axis of<br />symmetry, then we will have the Form II symmetry for the structural matrices, and alternatively if<br />we have some active DOFs on the axis, we will have Form III symmetry. These forms are already<br />developed and employed in structural dynamics and stability analysis of frame structures.<br />However, for the structures having both symmetric DOFs and anti-symmetric DOFs,<br />simultaneously, we will have different canonical forms, defined in this paper as the Form A and<br />Form B symmetry. Thus the main objective is to develop these forms and explore the governing<br />relationships. The presented method is then applied to the analysis of symmetric structures.
canonical forms,symmetry and anti-symmetry,trusses,form A,form B
http://ijstc.shirazu.ac.ir/article_2424.html
http://ijstc.shirazu.ac.ir/article_2424_a3c8ce9aa0102fea5e8efc82d30e013f.pdf