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 soilsand formulates the theory for finite element analysis by treating the pore water and pore air as amixed pore fluid. This formulation considers variations in the permeability and compressibility ofthe mixed pore fluid with changes in the void ratio and degree of saturation. The compressibility ofthe mixed pore fluid is derived using Boyle’s Law. An example of the settlement of a verticaldrain is investigated and discussed; this example demonstrates that the numerical analysis theory isapplicable and reliable. The results indicate that the rate of consolidation of unsaturated soils isclearly slower than that of saturated soils, the rate of dissipation of the pore fluid pressure isconsiderably slower, and the permeability of the mixed pore fluid decrease during consolidation.This theory is applicable to unsaturated soils with high degrees of saturation and can be used toobtain 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 ofsymmetry can be either symmetric or anti-symmetric. If there is no active DOF on the axis ofsymmetry, then we will have the Form II symmetry for the structural matrices, and alternatively ifwe have some active DOFs on the axis, we will have Form III symmetry. These forms are alreadydeveloped and employed in structural dynamics and stability analysis of frame structures.However, for the structures having both symmetric DOFs and anti-symmetric DOFs,simultaneously, we will have different canonical forms, defined in this paper as the Form A andForm B symmetry. Thus the main objective is to develop these forms and explore the governingrelationships. 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