فهرست مقالات Fundamental period

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  1 - A Mathematical Formulation to Estimate the Fundamental Period of High-Rise Buildings Including Flexural-Shear Behavior and Structural Interaction
  E Noroozinejad Farsangi H Melatdoust A Bin Adnan
  The objective of the current study is to develop a simple formula to estimate the fundamental vibration period of tall buildings for using in equivalent lateral force analysis specified in building codes. The method based on Sturm-Liouville differential equation is pres چکیده کامل

  The objective of the current study is to develop a simple formula to estimate the fundamental vibration period of tall buildings for using in equivalent lateral force analysis specified in building codes. The method based on Sturm-Liouville differential equation is presented here for estimating the fundamental period of natural vibration. The resulting equation, based on the continuum representation of tall buildings with various lateral resisting systems for natural vibration of the buildings, is proved to be the forth-order Sturm-Liouville differential equation, and a quick method for determining the fundamental period of natural vibration of the building is presented. Making use of the coupled wall theory for natural vibration, the method is extended to deal with vibration problem of other buildings braced by frame, walls or/and tube. The proposed formulation will allow a more consistent and accurate use of code formulae for calculating the earthquake-induced maximum base shear in a building. Use of the method is economical with respect to both computer time and equipment and can be used to verify the results of the finite element analyses where the time-consuming procedure of handling all the data can always be a source of errors. پرونده مقاله
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  2 - Presentation of Empirical Relation for the Fundamental Period of Irregular Steel Frames with EBF Steel Braces
  F. Omidinasab S. Baharipour
  Developments in the field of Structure and Earthquake Engineering and also consequences of earthquakes have been led to develop some continually changes and improvement of seismic regulations around the world. In regards to seismicity of Iran, it is necessary and also p چکیده کامل

  Developments in the field of Structure and Earthquake Engineering and also consequences of earthquakes have been led to develop some continually changes and improvement of seismic regulations around the world. In regards to seismicity of Iran, it is necessary and also possible to review and edit the Seismic Regulations of Iran and compare it with the other countries; so it seems that a comparative study of relations of the fundamental period based on various regulations is required. This debate is regarded to change all kinds of structures; for example, here the irregular structures with varieties of irregularities on height can be mentioned. The irregular structures are more observable than the other ones because of their unique form and creative ideas of architectures. Then, in regards to extend and grow of usage these structures around the country we shall collect and present a correct study based on an accurate planning because investigation of the fundamental period of irregular steel frames on height is required. By this research the investigation of the fundamental period of three-opening irregular steel frames with divergent bracing along with irregularities on height is studied. Models of three-bay frames with 2-15 storeys have been modeled by Etabs Software; also a series of short, middle and high frames have been modeled by Opensses Software, and then they are compared together, finally the analyzed periods have been compared with the different relations in Regulation; then by the use of MATLAB-2013 Software some coefficients of formula of the fundamental period have been determined for three-bay frames with one-sided-stepped on the height and divergent bracing. پرونده مقاله