Wood elements and anatomical ratio of Dipterocarpus indicus were studied to evaluate variation among populations and to recommend for end selection. The variation of wood element [fibre length (FL), fibre diameter (FD), lumen diameter (LD), cell wall thickness (CWT), double wall thickness (DWT), and lumen volume (LV)] and anatomical ratio [fibre lumen area (FLA), slenderness ratio (SR) and runk...

The curved plate has been extensively used as a structural member in many industrial fields, especially the shipbuilding industry. present study investigated ultimate strength and collapse behavior of simply supported under longitudinal compressive load. To do this, experimental apparatuses for evaluating buckling test plates was developed. Then, series experiments carried out by considering fl...

in this research with using of obtained information from a natural fraxinus the variation of quantities and qualitative measures of current stand in an 8 year period was conducted in chelir part of kheyroud forest. data collection was conducted by full callipering method in two periods of 1384 and 1392. during the period of study the parameters of dominant mean height and relative crown height ...

Tubular structural members with slender cross-sections are susceptible to failure through local buckling of their tube walls. Previous numerical studies steel elliptical hollow sections in compression predicted the modes and ultimate loads particularly specimens, results used calibrate design methods for sections. Although these parametric were conducted across a wide slenderness range, it was ...

In this paper, homotopy perturbation and modified Lindstedt-Poincare methods are employed for nonlinear free vibrational analysis of simply supported and double-clamped beams subjected to axial loads. Mid-plane stretching effect has also been accounted in the model. Galerkin's decomposition technique is implemented to convert the dimensionless equation of the motion to nonlinear ordinary differ...

In this paper, for topology optimization of double layer grids, an efficient optimization method is presented by combination of Imperialist Competitive Algorithm (ICA) and Gravitational Search Algorithm (GSA) which is called ICA-GSA method. The present hybrid method is based on ICA but the moving of countries toward their relevant imperialist is done using the la...

The test results described in Part 1 of this paper (Lee and Bruneau, 2008) on twelve steel built-up laced members (BLMs) subjected to quasi-static loading are analyzed to provide better knowledge on their seismic behavior. Strength capacity of the BLM specimens is correlated with the strength predicted by the AISC LRFD Specifi cations. Assessments of hysteretic properties such as ductility capa...

A model for slender, liquid crystalline, bicomponent fibres at low Reynolds and Biot numbers based on the slenderness ratio as the perturbation parameter, is presented. The model results in one-dimensional equations for the fibre’s radii, axial velocity component and temperature, to which we have added two transport equations for the molecular orientation and crystallization and the effects of ...