An-Najah Blogs :: An-Najah Blogs :: en-us Sat, 24 Oct 2020 04:57:54 IST Sat, 24 Oct 2020 04:57:54 IST Three Dimensional Response Spectrum Soil Structure Modeling Versus Conceptual Understanding To Illustrate Seismic Response Of Structures ArticlesPresent methods of analysis and mathematical modeling contain so many assumptions that separate them from reality and thus represent a defect in design which makes it difficult to analyze reasons of failure Three dimensional 3D modeling is so superior to 1D or 2D modeling static analysis deviates from the true nature of earthquake load which is ``a dynamic punch and conflicting assumptions exist between structural engineers who assume flexible structures on rigid block foundations and geotechnical engineers who assume flexible foundations supporting rigid structures Thus a 3D dynamic soil-structure interaction is a step that removes many of the assumptions and thus clears reality to a greater extent However such a model cannot be analytically analyzed We need to anatomize and analogize it The paper will represent a conceptual analogical 1D model for soil structure interaction and clarifies it by comparing its outcome with 3D dynamic soil-structure finite element analysis of two structures The aim is to focus on how to calculate the period of the structure and to investigate effect of variation of stiffness on soil-structure interaction 2008 SEISMIC ENGINEERING CONFERENCE: Commemorating the 1908 Messina and Reggio Calabria Earthquake AIP Conference Proceedings Volume 1020 pp 1143-1150 2008 http:dxdoiorg10106312963734The effect of shear wall distribution on the dynamics of reinforced concrete structures ArticlesThe inclusion of a soft storey in multistory concrete buildings is a feature gaining popularity in urban areas where land is of exorbitant cost In earthquake prone zones this feature has been observed in post earthquake investigations Although engineers are prepared to accept the notion that a soft storey poses a weak link in Seismic Design yet the idea demands better understanding The following study illustrates the importance of the judicious distribution of shear walls The selected building is analyzed through nine numerical models which address the behavior of framed structures The parameters discussed include inter alias the fundamental period of vibration lateral displacements axial and shear forces It is noticed that an abrupt change in stiffness between the soft storey and the level above is responsible for increasing the strength demand on first storey columns Extending the elevator shafts throughout the soft storey is strongly recommendedA scrutiny of the Equivalent Static Lateral Load method of design for multistory masonry structures ArticlesBuilding structures with a soft storey are gaining widespread popularity in urban areas due to the scarcity of land and due to the pressing need for wide open spaces at the entrance level In earthquake prone zones dynamic analysis based on the Equivalent Static Lateral Load method is attractive to the novice and the design codes leave the choice of the analysis procedure up to the discretion of the designer The following is a comparison of the said method with the more elaborate Response Spectrum Method of analysis as they apply to a repertoire of different structural models The results clearly show that the former provides similar results of response in structures with gradual change in storey stiffness; while it is over conservative for a bare frame structure It is however less conservative for structures with a soft storey