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

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.

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

2012 ◽  
Vol 256-259 ◽  
pp. 2102-2105
Author(s):  
Jing Xu Song ◽  
Wen Pan
Keyword(s):  
Seismic Isolation ◽  
Design Method ◽  
Time History ◽  
Design Stage ◽  
Design Quality ◽  
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. This new method will be valuable for enhancing design quality and reducing design period. This paper describes the theoretical basis of the method.

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

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.

Key Points Analysis for Seismic Design of Super High-Rise Building

2013 ◽  
Vol 423-426 ◽  
pp. 1230-1233
Author(s):  
Ting Yu Mei ◽  
Lang Wu
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Response Spectrum ◽  
Time History ◽  
Stage Design ◽  
High Rise ◽  
High Rise Building ◽  
History Analysis ◽  
Key Points ◽  
And Performance

In recent years, high-rise buildings have developed very rapidly in our country. Because of the particularity of the high-rise building, more strictly technical measures should be taken in seismic design to ensure security. Three level fortifications, two stage design method have been used for seismic design in our country. Combined with the practical, the key points of response spectrum, time history analysis and performance design which related to seismic design of high-rise buildings were analyzed.

Research on Elastic-Plastic Seismic Response of Inclined Mega-Structures

2011 ◽  
Vol 255-260 ◽  
pp. 2532-2540
Author(s):  
Nan Zhao ◽  
Lei Xin Jiang
Keyword(s):  
Bearing Capacity ◽  
Seismic Response ◽  
Design Method ◽  
Time History ◽  
Time History Analysis ◽  
Elastic Plastic ◽  
Limit Value ◽  
History Analysis ◽  
Performance Based Seismic Design ◽  
Seismic Design Method

With a special structure system and architectural shape, Kelamayi Exhibition Building has a quite complicated seismic response and dynamic behavior. Based on performance-based seismic design method, vibration characteristics and seismic response under different earthquakes are researched in this paper. Elastic-plastic model is made, and elastic-plastic time history analysis of structure subjected to strong earthquake is carried out, to verify the bearing capacity of the structure according to aseismic behavior indexes. The results of static analysis and elastic-plastic time history analysis show that, the maximum storey drift angle is less than the limit value 1/100. Parts of the structure is in plastic, but not deep, and can be put into use after some repairment. In a word, Kelamayi Exhibition Building can meet the requirement of seismic fortification and fixed aseismic behavior indexed, and have enough seismic bearing capacity.

scholarly journals Seismic Retrofit of an Existing Reinforced Concrete Building with Buckling-restrained Braces

2021 ◽  
Vol 15 (1) ◽  
pp. 203-225
Author(s):  
Massimiliano Ferraioli ◽  
Angelo Lavino ◽  
Carmine Molitierno ◽  
Gennaro Di Lauro
Keyword(s):  
Reinforced Concrete ◽  
Uniform Distribution ◽  
Design Method ◽  
Time History ◽  
Seismic Retrofit ◽  
Time History Analysis ◽  
Performance Criteria ◽  
Ductility Demand ◽  
History Analysis ◽  
Buckling Restrained Braces

Background: The seismic retrofitting of frame structures using hysteretic dampers is a very effective strategy to mitigate earthquake-induced risks. However, its application in current practice is rather limited since simple and efficient design methods are still lacking, and the more accurate time-history analysis is time-consuming and computationally demanding. Aims: This paper develops and applies a seismic retrofit design method to a complex real case study: An eight-story reinforced concrete residential building equipped with buckling-restrained braces. Methods: The design method permits the peak seismic response to be predicted, as well as the dampers to be added in the structure to obtain a uniform distribution of the ductility demand. For that purpose, a pushover analysis with the first mode load pattern is carried out. The corresponding story pushover curves are first idealized using a degrading trilinear model and then used to define the SDOF (Single Degree-of-Freedom) system equivalent to the RC frame. The SDOF system, equivalent to the damped braces, is designed to meet performance criteria based on a target drift angle. An optimal damper distribution rule is used to distribute the damped braces along the elevation to maximize the use of all dampers and obtain a uniform distribution of the ductility demand. Results: The effectiveness of the seismic retrofit is finally demonstrated by non-linear time-history analysis using a set of earthquake ground motions with various hazard levels. Conclusion: The results proved the design procedure is feasible and effective since it achieves the performance objectives of damage control in structural members and uniform ductility demand in dampers.

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