- Tuesday, January 1, 2008
- Published at:Not Found
- The inclusion of a soft storey in multistory concrete buildings is a feature gaining popularity in urban areas where the cost of land is exorbitant. 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 and bending moment. 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 recommended.
An-Najah University Journal
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- Tuesday, January 1, 2008
- Published at:Not Found
- The 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 recommended.
2008 SEISMIC ENGINEERING C
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- Tuesday, January 1, 2008
- Published at:2008 SEISMIC ENGINEERING CONFERENCE COMMEMORATING THE 1908 MESSINA AND REGGIO CALABRIA EARTHQUAKE, PARTS 1 AND 2, Volume: 1020 Pages: 1151-1158 Part: Part 1-2 Published: 2008
- Building 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.
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- Monday, January 1, 1996
- Published at:An-Najah J. Res., Vol. 4, No. 10, (1996)
- For an existing reinforced concrete or steel structure the evaluation of the stiffness matrix may be hampered by certain physical limitations such as material deterioration resulting from prolonged use an adverse or in a corrosive environment. The following is a method that allows the determination of the member stiffness of an indeterminate truss through a minimization technique of a properly constructed Error Function. Thus exact sectional and material properties do not have to be known a priori.
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- Saturday, January 1, 1994
- Published at:An-Najah J. Res., Vol. II, No. 8 (1994)
- In a submerged rigid oil storage tank it is possible to evaluate the internal and external hydrodynamic forces separately. Internally the forces are due to internal waves generated at the oil-water interface. Externally, they are due to radiated waves. When such a tank is made of steel, at it is usually the case, the internal and external forces get coupled through the flexibility of the shell, hence their solutions become inseparable. The following is an analytical treatment for the case of a flexible tank it expands the solution of the rigid tank to include the shell flexibility effect. The submerged tank is assumed to be subject to a harmonic lateral ground excitation.
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