scholarly journals Displacement-based Behavior Design Method for High-rise Seismic Isolation

2020 ◽  
Vol 768 ◽  
pp. 032010
Author(s):  
XiaoHuan Wang
Keyword(s):  
Seismic Isolation ◽  
Design Method ◽  
High Rise ◽  
Behavior Design ◽  
Displacement Based

Seismic Rehabilitation of Existing Reinforced Concrete Buildings with Seismic Isolation: A Case Study

2014 ◽  
Vol 30 (4) ◽  
pp. 1619-1642 ◽  
Author(s):  
Donatello Cardone ◽  
Giuseppe Gesualdi
Keyword(s):  
Seismic Isolation ◽  
Residential Building ◽  
Existing Buildings ◽  
Isolation System ◽  
Rehabilitation Process ◽  
Seismic Rehabilitation ◽  
High Rise ◽  
System Type ◽  
Displacement Based

The use of seismic isolation for the seismic rehabilitation of existing buildings is very attractive but often very tricky due to several aspects related to its implementation. In this paper, a case study of seismic rehabilitation of a high-rise residential building with seismic isolation is presented. The building under consideration is located in southern Italy and it is placed next to another building from which it is separated by a gap of 400 mm. In the paper, all the steps of the seismic rehabilitation process are described. First, the target objective of the seismic rehabilitation and the choice of isolation system type and location are discussed. The design of the isolation system, carried out following a direct displacement-based approach, is then examined. Finally, the main phases followed in the installation of the isolation system are described. Some comments on costs and time needed to complete the intervention are also reported.

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

2011 ◽  
Vol 255-260 ◽  
pp. 2555-2559
Author(s):  
Zhen Sun ◽  
Wei Qing Liu ◽  
Shu Guang Wang ◽  
Ding Zhou ◽  
Dong Sheng Du
Keyword(s):  
Seismic Isolation ◽  
Design Method ◽  
Response Spectrum ◽  
Base Shear ◽  
Direct Displacement Based Design ◽  
High Intensity Zone ◽  
Lead Rubber Bearings ◽  
Displacement Based ◽  
Rubber Bearings ◽  
Relationship Of

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.

Direct Displacement Based Seismic Design of High Rise Structures with Strengthened Stories (II) - Application

2011 ◽  
Vol 250-253 ◽  
pp. 2186-2195
Author(s):  
Ke Jia Yang ◽  
Lin Zhu Sun ◽  
Lian Meng Chen
Keyword(s):  
Seismic Design ◽  
Mechanical Characteristics ◽  
Design Method ◽  
Design Procedure ◽  
High Rise ◽  
New Ideas ◽  
Earthquake Action ◽  
Displacement Based ◽  
Seismic Design Method ◽  
Displacement Based Seismic Design

Based on mechanical characteristics of high rise structures with strengthened stories, the author performed direct displacement based seismic design on a high rise structure with 2 strengthened stories according to the direct displacement based seismic design principle. The performance levels are set to be “serviceability” under medium earthquake and “life safety” under major earthquake, respectively. The design procedures are with the following features: (1) Definition and selection of “key” stories are based on mechanical characteristics of high rise structures with strengthened stories; (2) Determination of mode number and calculation of horizontal earthquake action verified the availability of the design procedure; (3) some new ideas are proposed to improve the earthquake action calculation and structural performance control. The design procedure verified the effectiveness, feasibility and availability of the proposed direct displacement based seismic design method.

A Displacement-Based Optimal Design Method of RC Frames Subjected to Minor Earthquakes

2012 ◽  
Vol 594-597 ◽  
pp. 795-799
Author(s):  
Gui Tao Chen ◽  
De Min Wei
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Virtual Work ◽  
Design Method ◽  
Horizontal Displacement ◽  
Target Displacement ◽  
Programming Technique ◽  
Direct Displacement Based Design ◽  
Rc Frames ◽  
Displacement Based

A displacement-based optimization design method of RC structure was proposed by combining direct displacement-based design method with nonlinear programming technique. To avert the influence of target displacement, the stationary constraint displacement was presented, and the target displacement can be updated during the optimal design process. Principle of virtual work and Gaussian integral method was employed to simplify the explicit relationship between horizontal displacement and the section dimension. Comparison analysis of the local optimal results corresponding to different displacement shapes was conducted to achieve global optimal design. The numerical tests presented demonstrate the computational advantages of the discussed methods and suggesting that the proposed method is a reliably and efficiently tool for displacement-based optimal design.

scholarly journals Seismic Analysis Method for Underground Structure in Loess Area Based on the Modified Displacement-Based Method

2021 ◽  
Vol 11 (23) ◽  
pp. 11245
Author(s):  
Ruijie Zhang ◽  
Dan Ye ◽  
Jianting Zhou ◽  
Dengzhou Quan
Keyword(s):  
Design Research ◽  
Seismic Analysis ◽  
Design Method ◽  
Underground Structure ◽  
Time History ◽  
Shaking Table ◽  
Underground Structures ◽  
Loess Area ◽  
Geological Conditions ◽  
Displacement Based

At present, the seismic design research of underground structures in loess areas is lagging behind compared with practical engineering requirements. The selection of seismic calculation methods and parameters does not consider the influences of the special geological conditions in various regions, so their usefulness is limited. Based on the above problems, a modified displacement-based method (DBM) was proposed and its application was compared with the most commonly used methods of analysis (force-based design method, displacement-based design method, detailed equivalent static analysis numerical method, and the full dynamic time-history method). The results were also validated by considering data from shaking table tests conducted on a case study involving the underground Feitian Road subway station in Xi’an. The results show that compared with DBM, the average accuracy of the modified DBM technique is improved by 41.65%. The modified DBM offers good accuracy, simplicity in its model, a rapid analysis time, and easy convergence.

Seismic Isolation Devices Based on Sliding between Surfaces with Variable Friction Coefficient

2016 ◽  
Vol 32 (4) ◽  
pp. 2291-2315 ◽  
Author(s):  
Paolo M. Calvi ◽  
Matteo Moratti ◽  
Gian Michele Calvi
Keyword(s):  
Seismic Isolation ◽  
Base Isolation ◽  
Time History ◽  
Absorption Capacity ◽  
Sliding Isolation ◽  
Variable Friction ◽  
Displacement Based ◽  
Nonlinear Time History ◽  
High Level ◽  
Base Isolators

Base isolators are effective tools to favor a high level of building performance under lateral load, providing protection to both structural and nonstructural elements. In this context, this paper discusses the possibility of employing materials with different frictional properties to enhance the response of flat and curved-surface base isolators. Two innovative devices, referred to as “BowTie” and “BowC,” are introduced and discussed in some detail. A series of nonlinear time history analyses are then conducted using a customized computer program and considering a number of case study structures, designed applying a displacement-based approach. The results of the analyses are used to discuss the key differences between variable friction and constant friction sliding isolation devices. It is shown that the newly proposed isolators may represent an improvement on classic base-isolation solutions, in light of their higher energy absorption capacity, which contributes to significantly enhance their performance.

Sign in / Sign up

Export Citation Format

Share Document