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Coupled Systems Mechanics
  Volume 9, Number 2, April 2020 , pages 183-200

Effect of rigid connection to an asymmetric building on the random seismic response
Hamed Ahmadi Taleshian, Alireza Mirzagoltabar Roshan and Javad Vaseghi Amiri

    Connection of adjacent buildings with stiff links is an efficient approach for seismic pounding mitigation. However, use of highly rigid links might alter the torsional response in asymmetric plans and although this was mentioned in the literature, no quantitative study has been done before to investigate the condition numerically. In this paper, the effect of rigid coupling on the elastic lateral-torsional response of two adjacent one-story column-type buildings has been studied by comparison to uncoupled structures. Three cases are considered, including two similar asymmetric structures, two adjacent asymmetric structures with different dynamic properties and a symmetric system adjacent to an adjacent asymmetric one. After an acceptable validation against the actual earthquake, the traditional random vibration method has been utilized for dynamic analysis under Ideal white noise input. Results demonstrate that rigid coupling may increase or decrease the rotational response, depending on eccentricities, torsional-to-lateral stiffness ratios and relative uncoupled lateral stiffness of adjacent buildings. Results are also discussed for the case of using identical cross section for all columns supporting each plan. In contrast to symmetric systems, base shear increase in the stiffer building may be avoided when the buildings lateral stiffness ratio is less than 2. However, the eccentricity increases the rotation of the plans for high rotational stiffness of the buildings.
Key Words
    rigid link; random vibration; torsion; dynamic properties; response ratio
Hamed Ahmadi Taleshian, Alireza Mirzagoltabar Roshan and Javad Vaseghi Amiri: Department of Civil Engineering, Noshirvani University of Technology, Babol, Iran

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