Showing 6 results for Kazemi
H. Haji-Kazemi and M. Arab,
Volume 17, Issue 1 (7-1998)
Abstract
In this paper a new element for analysis of thin-walled structures is presented, and the effects of secondary shear stresses on longitudinal displacements are examined. Since the Interpolation Functions are based on non-uniform torsional differential equations, the analysis of stiffness matrix is facilitated. Therefore, its ability to produce accurate results with the least number of elements is considerably improved. Furthermore, this element can be used in the analysis of all kinds of thin-walled, straight or curved beams with open or closed sections.
M. T. Kazemi,
Volume 18, Issue 1 (4-1999)
Abstract
Realistic prediction of concrete shrinkage and creep requires the calculation of the distributions of relative humidity at various times. Although the distributions of the relative humidity can be computed by numerical methods from the differential equation for diffusion, simple prediction formulas can facilitate structural analysis. The purpose of this paper is to present a simple formula for slabs and walls, which agrees with the shrinkage prediction formula and with the measurements of pore relative humidity. The drying process may be considered as one-dimensional in space for walls and slabs. A simple explicit formula with three parameters is formulated. In a more simplified version, a single parameter formula is developed. The parameter can be estimated from the existing empirical relations for shrinkage time parameter.
R. Kazemi and B. Hamedi,
Volume 19, Issue 2 (1-2001)
Abstract
This paper presents the results of a recent project of IKCo’s research center to modify Paykan 1600’s rear suspension mechanism with the purpose of improving comfort, stability and handling qualities. The car was originally equipped with a solid rear axle with leaf springs. By replacing the original mechanism with a three-link mechanism with panhard bar and coil springs, the ride comfort and handling characteristics of the car were noticeably improved. 7DOF ride and 3DOF handling models were developed and analyzed to determine the important kinematic and dynamic effects of the new mechanism such as Roll Center and Roll Stiffness on vehicle responses. To verify analytical results, subjective tests were carried out on the vehicle. The results demonstrated remarkable improvement of the car’s dynamic behavior.
K. Eshgee and M. Kazemi,
Volume 23, Issue 1 (7-2004)
Abstract
In this paper, a new algorithm for solving the single loop routing problem is presented. The purpose of the single loop routing problem(SLRP) is to find the shortest loop for an automated guided vehicle covering at least one edge of each department of a block layout. First it shown that this problem can be represented as a graph model. Then a meta-heuristic algorithm based on and colony system is developed for ALRP by using the properties of the graph model. Computational results show the efficiency of the proposed algorithm in comparison with other techniques for solving SLRP.
M. Sheikhi and H. Haji-Kazemi,
Volume 25, Issue 2 (1-2007)
Abstract
Jacketing of reinforced concrete columns is a common and useful strengthening method. This method substantially improves mechanical properties of the column, such as flexural strength as well as shear and ductility. In this paper, the behavior of confined reinforced concrete columns are investigated. The results indicate that the method is more effective for slender columns in the region of their failure zone.
F. F. Heidargheitaghi, M. H. M. H. Ghadiri Rad, M. Kazemi,
Volume 40, Issue 2 (1-2022)
Abstract
Continuously varying cross-section members have found wide applications in engineering for cost and resistance optimization. Since steel structures generally have more slender members compared to concrete structures, buckling analysis of steel members is of more importance. Determining the critical load of functionally varying cross-section columns using the analytical solution is a time-consuming process. In this paper, buckling analysis of non-prismatic steel columns is conducted using the meshless local Petrov-Galerkin (MLPG) method. In meshless methods, the scattered nodes are used rather than the elements to model the problem domain and its boundaries. The change of the inertia moment within the length of a column is characterized by introducing a power function with variable taper ratio and exponent. The radial basis function is used to discretize the differential equation governing the buckling. The penalty method is used for the imposition of the boundary conditions. Numerical examples of the critical buckling load for prismatic and non-prismatic columns using the proposed method are compared with the analytical solution, and the effectiveness of the MLPG method for buckling analysis of non-prismatic columns is validated. Also, buckling analysis of muscle column members subjected to non-uniform axial load is carried out to show the efficiency of the proposed method. The effect of several parameters such as non-uniformity of the load and variation of the cross-section on the buckling load of the column is discussed in details.
