Multy-story building: Finite element modelling - Essay Example

The results from the analysis of a high-rise frame structure with a concrete core will be used to determine how dependable this process actually is. KEYWORDS: Multi-story buildings, Equivalent cubes 1. INTRODUCTION Finite element modeling is often used to prevail over overcome experimental limitations in forecasting and examining the performance of structures. When planning and examining the performance of high-rise buildings, it is critical that a successful modeling practice is used due to the difficulties of real structural behavior and full scale measurement.

Previously, a number of different modeling techniques have been used to examine the performance of high-rise buildings [1-6]. Pekau et al. [1, 2] introduced the “Finite Story Method,” which can reduce the unknowns of each storey in a high-rise building, thus improving the computing efficiency considerably. A program developed by Oztorun et al. [3] contains a special mesh generation subroutine and graphics program for the finite element analysis of shear walls in buildings. Through this program, beams or columns can be put in or taken out at a moment’s notice; this makes the modeling process suitable.

Mahendran et al. [4] argued that a 2-D modeling analysis was not adequate to forecast the actual performance of the structures; thus, a 3-D modeling method for steel portal frame buildings is required. Poulsen et al. [5] gave information about how to judge the reinforcing bars and tension or compression behavior of concrete in the limit state analysis of reinforced concrete plates subjected to in-plane forces. This is helpful for analysis of single reinforced elements. When modeling high- rise structures, there are regularly fears over node limitations and rising computational time and memory capacity of finite element analysis tools, such as ANSYS.

This technique can be used in the substructure. One method involving substructures is a supper-element method that was introduced by Kim et al [6] to model shear wall structures. Through this method, equal accuracy within a shortened computing time can be reached. It was also discovered that a great deal of modeling work has centered on the seismic or wind behavior of structures [7-16], as these lateral loads are the most serious external loads and have the potential to severely damage high-rise buildings.

Virtually every single one of these models is concerned about a limit state analysis or forecast. There can now be confidence in the seismic or wind analysis of framed [7, 14] and reinforced concrete shear wall structures [8] due to the research that has been carried out in these areas. Despite this, many of these methods are based around 2-D models that entail many simplifications when compared to the real performance of 3-D structures. In spite of the fact that some 3-D models were used in the analysis, these models were restricted to modeling single elements.

It would seem that the situation above is mainly due to the restrictions of current FE analysis tools. Oztorun et al. [3] made the point that due to the great and intricate number of input requirements and node limitations, utilization of other finite element analyzing software, such as SAP90, seems to be unfeasible. Due to the many software restrictions, the 3-D analysis of high-rise buildings is very difficult, particularly when analysis of contributions of non-structural components to the building stiffness is