EFFECT OF HORIZONTAL COMPONENT OF EARTHQUAKE ON HANGED ROOFS LOADED WITH HEAVY WALLS
Loading...
Date
2022-05-17
Authors
Motaz Mohammad Ibrahim Abu Aladas
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Background: It can be clearly seen that most of today's buildings contain cantilevers, and in most cases these cantilevers are loaded by moderate to heavy masonry loads. The effect of earthquake components on the loaded cantilevers is not clearly described in the design codes, which is a research interest. The main objective of this research is to understand the behavior of cantilevers when subjected to a horizontal earthquake component under different conditions, since the codes do not give the necessary attention to the weakness of cantilevers and their effects on the vulnerability of structures.
Methods: Some of the most sensitive properties of cantilevers were selected to study the behavior of cantilevers and their effects on the response of structures. The literature review included the investigation and collection of information on the most important factors affecting the behavior of cantilevers, such as direction, length, and loading of cantilevers. In order to study each of these parameters, a series of models with specific parameters were analyzed in the Extended 3D (Three Dimensional) Analysis of Building Systems (ETABS) software after being verified and adopted.
Results: the results of the forces and stresses in the presence of masonry have an increase of 152% for axial forces and 13.4% for shear forces and bending moments due to the horizontal component of the earthquake. On the other hand the vertical earthquake component does not have an axial effect on the cantilevered sections and the effect of axial stress due to the horizontal earthquake component on the shear capacity of sections does not exceed 2% for beams and 1% for ribs. And critical cantilever length to successive span length can reach 22% in some cases.
Conclusion: The research indicate that it’s recommended to avoid an irregular structure to minimize the inherent torsion. On the other hand, a regular structure, where the center of mass coincides with the center of stiffness, may have a torsional response in some cases. Research has also shown that the horizontal earthquake component does not cause a significant decrease in shear capacity and that the vertical earthquake component is not worse than the horizontal one.
Keywords: loaded cantilever, torsional mode, horizontal earthquake component, vertical earthquake component, site seismicity.