Two-Stage Design Method for Multi-Story Structures Equipped Metal Dampers, Part I: Theory

The two-stage design method for multi-story structures equipped metal dampers is put forward based on the Code for Seismic Design of Buildings (GB50011-2010) and the Code of Japan Society of Seismic Isolation. For preliminary design stage, simplified method is adopted to estimate added stiffness and damping on each story, offering an approximate requirement of dampers. For detail design, the time history analysis is employed to verify the performance of structure with added dampers and determine number of energy dissipation device. This new method will be valuable for enhancing design quality and reducing design period. This paper describes the theoretical basis of the method.

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Two-Stage Design Method for Multi-Story Structures Equipped Metal Dampers, Part II: Case Study

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.256-259.2212 ◽

2012 ◽

Vol 256-259 ◽

pp. 2212-2215

Author(s):

Jing Xu Song ◽

Wen Pan

Keyword(s):

Seismic Isolation ◽

Design Method ◽

Time History ◽

New Method ◽

Design Stage ◽

Two Stage ◽

Stage Design ◽

Detail Design ◽

Preliminary Design Stage ◽

Two Stage Design

The two-stage design method for multi-story structures equipped metal dampers is put forward based on the Code for Seismic Design of Buildings (GB50011-2010) and the Code of Japan Society of Seismic Isolation. For preliminary design stage, simplified method is adopted to estimate added stiffness and damping on each story, offering an approximate requirement of dampers. For detail design, the time history analysis is employed to verify the performance of structure with added dampers and determine number of energy dissipation device. In this part, a 10-story frame is analyzed by the new method, and the numerical investigation shows that the new method is simple and flexible for application in engineering.

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The Two-Stage Design Method of Isolated Structures Based on New Code for Seismic Design of Buildings

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.275-277.1243 ◽

2013 ◽

Vol 275-277 ◽

pp. 1243-1249

Author(s):

Qiang Qiang Zhang ◽

Wen Pan ◽

Bai Feng Sun

Keyword(s):

Base Isolation ◽

Design Method ◽

Time History ◽

Time History Analysis ◽

Design Stage ◽

Two Stage ◽

Stage Design ◽

Seismic Code ◽

History Analysis ◽

Isolation Device

Two-stage design method for base isolation structures includes simplified estimation and time history analysis. Simplified estimation is used in preliminary design stage for estimating the weight and the first period of an isolated structure, the upper structure is simplified as a SDOF system. According to the expected response reduction goals and response spectrum, the first period of the isolated structure, stiffness of isolation device and number of isolation bearing can be induced. Time history analysis is employed in detail design stage, for determination and optimization of isolation device based on current standards. The author has made it realized based on the old Seismic Code. As there are some changes of provision on base isolation analysis in new code, including the value of bearing stiffness and safety factor, etc., the method mentioned above should be updated. Numerical investigation shows that for regular multi-storey frame structures, the difference of the maxium ratio of floor shear between the old and new Seismic Code increase with fortification intensity.

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