A Direct Displacement-Based Design Method Based on Chinese Code of Base Isolated Structures

Abstract:

A simple and efficient direct displacement-based design (DDBD) method is introduced to base isolated (BI) structures. Assuming the vibration mode of superstructure to be the shear type and considering the BI structure to be an equivalent single degree of freedom (ESDOF) system with spring and damper at the seismic isolation layer. The acceleration response spectrum in Chinese code is converted to displacement response spectrum. Corresponding to the design displacement, the equivalent period is obtained. The relationship of the deign displacement, equivalent period, equivalent stiffness and base shear of the system can be derived from the given formulations. Then, the distribution of the base shear along the floors is obtained. This method has been applied to the design of a 12-story BI structure with lead rubber bearings in high intensity zone in Suqian city, Jiangsu province. The results show that the method is feasible for the design of BI structures.

• Periodical: Advanced Materials Research (Volumes 255-260)
• Pages: 2555-2559
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.255-260.2555
• Online since: May 2011
• Authors: Zhen Sun, Wei Qing Liu, Shu Guang Wang, Ding Zhou, Dong Sheng Du
• Keywords: Base-Isolated Structure, Direct Displacement-Based Design, Lead Rubber Bearing

References

[1] M.J.N. Priestley, M.J. Kowalsky, G. Ranzo and G. Benzoni, Preliminary development of direct displacement-based design for multi-degree of freedom systems. In: Proceedings of the 65th Annual Convention, SEAOC, Maui, Hawaii, (1996).

[2] A.B. Court, M.J. Kowalsky, Performance-based engineering of buildings - a displacement design approach. Structural Engineering World Wide, SEAOC, Paper No. T109-1, (1998).

[3] P. Fajfar, Capacity spectrum method based on inelastic demand spectra. Earthquake Engineering Structure Dynamics 28 (1999) 979-993.

DOI: 10.1002/(sici)1096-9845(199909)28:9<979::aid-eqe850>3.0.co;2-1

[4] D. Cardone, M. Dolce and G. Palermo, Force-based vs. direct displacement-based design of buildings with seismic isolation. In: The 14th world conference on earthquake engineering, Beijing, October (2008).

DOI: 10.1080/13632460903086036

[5] M. Midorikawa, M. Liba and N. Koshika, Seismic performance evaluation of seismically isolated buildings introduced to the building code of Japan. ASCE 126 (2004) 18-24.

DOI: 10.1115/1.1638390

[6] M.J.N. Priestley, G.M. Calvi and M.J. Kowalsky, Displacement-based seismic design of structures. IUSS Press, (2007).

[7] A.K. Chopra, R.K. Geol, Capacity-demand-diagram methods for estimating seismic deformation of inelastic structures: SDF systems. Report No. PEER-1999/02. Pacific Earthquake Engineering Research Center, University of California, Berkeley, April (1999).

[8] Code for seismic design of buildings (GB50011-2010). China Building Industry Press, (2010).