Estimation of the seismic energy demands of two-way asymmetric-plan building systems |
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| Authors: | Jui-Liang Lin Keh-Chyuan Tsai |
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| Institution: | (1) National Center for Research on Earthquake Engineering, 200, Sec.3, Xinhai Rd., Taipei, 10668, Taiwan;(2) National Taiwan University, Taipei, Taiwan |
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| Abstract: | This paper proposes a method for the estimation of the seismic energy demands of two-way asymmetric-plan buildings under bi-directional
ground excitations. The modal absorbed energies of asymmetric-plan buildings are estimated by using the three-degree-of-freedom
(3DOF) modal systems. The 3DOF modal system represents the two roof translations versus the two base shears and the roof rotation
versus the base torque relationships of each vibration mode of two-way asymmetric-plan buildings. Not only the total absorbed
energy but also the portions of the total absorbed energy contributed from translational and rotational deformations can be
respectively estimated. This study verifies the relationship between the signs of modal eccentricities and the trend of uneven
distribution of modal absorbed energy on floor-plan edges of asymmetric-plan buildings. The accuracy of the proposed method
was verified by analyzing one 3-storey and one 20-storey two-way asymmetric-plan buildings subjected to bi-directional ground
motions. The computational efficiency of the proposed method is confirmed by comparing the computation time with that required
by using the nonlinear response history analysis. |
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