Effect of inertia nonlinearity on dynamic response of an asymmetric building equipped with tuned mass dampers

2020 ◽  
Vol 19 (2) ◽  
pp. 499-513
Author(s):  
Hassan Rezazadeh ◽  
Fereidoun Amini ◽  
Majid Amin Afshar
Keyword(s):  
Dynamic Response ◽  
Tuned Mass Dampers ◽  
Asymmetric Building

scholarly journals Optimal design of tuned mass dampers through differential evolution method for reducing the dynamic response of structures subjected to earthquake loads

ENTRAMADO ◽  
2021 ◽  
Vol 17 (2) ◽  
pp. 244-254
Author(s):  
Daniel Alejandro Caicedo-Díaz ◽  
Luis Augusto Lara-Valencia ◽  
Yamile Valencia-González
Keyword(s):  
Optimal Design ◽  
Dynamic Response ◽  
Differential Evolution ◽  
Selection Process ◽  
Design Parameters ◽  
Tuned Mass Dampers ◽  
Ground Acceleration ◽  
Peak Displacement ◽  
Earthquake Loads

This paper introduces a methodology for the optimal design of passive Tuned Mass Dampers (TMDs) to control the dynamic response of buildings subjected to earthquake loads. The selection process of the optimal design parameters is carried out through a metaheuristic approach based on differential evolution (DE) which is a fast, efficient, and precise technique that does not require high computational efforts. The algorithm is aimed to reduce the maximum horizontal peak displacement of the structure and the root mean square (RMS) response of displacements as well. Furthermore, four more objective functions derived from multiple weighted linear combinations of the two previously mentioned parameters are also studied to obtain the most efficient TMD design configuration. A parallel process based on an exhaustive search (ES) with precision to 2 decimal positions is used to validate the optimization methodology based on DE. The proposed methodology is then applied to a 32-story case-study derived from an actual building structure and subjected to different ground acceleration registers. The best dynamic performance of the building is observed when the greatest weight is given to the RMS response of displacement in the optimization process. Finally, the numerical results reveal that the proposed methodology based on DE is effective in finding the optimal TMD design configuration by reducing the maximum floor displacement up to 4% and RMS values of displacement of up to 52% in the case-study building.

Dynamic response under pedestrian loading of the footbridge “La Belle Liégeoise”

2021 ◽  
Author(s):  
Frédéric Gens ◽  
Yves Duchêne ◽  
Vincent de Ville de Goyet
Keyword(s):  
Dynamic Response ◽  
Vibration Frequency ◽  
Tuned Mass Dampers ◽  
Critical Window ◽  
The City

<p>The particularly slender type of the footbridge "La Belle Liégeoise" is very sensitive to the pedestrian actions. A few days after the opening of the bridge, at the end of a huge spectacle organized in the Boverie park, some thousands of people took, in one way, the footbridge to reach the city. At this time, a lateral pitching of the suspended part of the structure started, making the crossing uncomfortable for users although this vibration frequency is outside the critical window defined by the SETRA guide.</p><p>The purpose of this paper is to detail the sizing of the seven tuned mass dampers equipping the structure to meet the code’s requirements and to explain studies carried out by Greisch to analyse causes of these large vibrations and propose solutions to solve the problem, or even to anticipate it for future works.</p>

Dynamic Response Control of a Wind-Excited Tall Building with Distributed Multiple Tuned Mass Dampers

2019 ◽  
Vol 19 (06) ◽  
pp. 1950059 ◽  
Author(s):  
Said Elias ◽  
Vasant Matsagar ◽  
T. K. Datta
Keyword(s):  
Dynamic Response ◽  
Equations Of Motion ◽  
Tall Building ◽  
Mode Shapes ◽  
Induced Response ◽  
Tuned Mass Dampers ◽  
Response Control ◽  
Modal Amplitude ◽  
Improved Performance ◽  
Multiple Tuned Mass Dampers

Dynamic response control of a wind-excited tall building installed with distributed multiple tuned mass dampers (d-MTMDs) is presented. The performance of d-MTMDs is compared with those of single tuned mass damper (STMD) and MTMDs installed at top of the building. The modal frequencies and mode shapes of the building are first determined. Based on the mode shapes of the uncontrolled and controlled building, the most suitable locations are identified for the dampers, in that the TMDs are placed where the modal amplitude of the building is the largest/larger in a particular mode, with each tuned to the modal frequency of the first five modes. The coupled differential equations of motion for the system are derived for the cases with the STMD, MTMDs, and d-MTMDs and solved numerically. Extensive parametric studies are conducted to compare the effectiveness of the three control schemes using STMD, MTMDs, and d-MTMDs by examining the variations in wind-induced responses. The mass ratios, damping ratios of the devices, number of TMDs, and robustness of the TMDs are the parameters of investigation. It is concluded that the MTMDs exhibit improved performance when compared with the STMD. The use of d-MTMDs is most efficient among the three schemes because it can effectively control wind-induced response of the building, while reduced space is required in the installation of the TMDs, as they are placed at various floors.

Copenhagen Inner Harbour Bridge

2016 ◽  
Author(s):  
Amar Bahra ◽  
Ian Firth
Keyword(s):  
Dynamic Response ◽  
Cross Sections ◽  
Service Condition ◽  
Design Criteria ◽  
The Novel ◽  
Unique Form ◽  
Box Girders ◽  
Tuned Mass Dampers ◽  
Simply Supported ◽  
Structural Aspects

<p>The new Inner Harbour Bridge in Copenhagen is innovative both in its method of opening and a number of its design features. The moving bridge comprises two steel box girders that retract by sliding between fixed concrete approach spans. The steel box girders are of a highly unusual form involving plan curvature, continually changing cross sections and a faceted – or triangulated – inner web. Furthermore, because of the support arrangement, the girders go from cantilevering to simply-supported conditions over the course of an opening cycle.<p>The dynamic response of the box girders, with 35 m cantilevering spans in the service condition, presented a challenge which was addressed in the design by a combination of rationalised design criteria and the application of a series of tuned mass dampers.<p>The project has been delayed for a variety of reasons, not least due to the original contractor going into liquidation part way through, and the fixed concrete spans were modified by adding a new composite top layer of reinforced concrete following the original casting.<p>This paper touches briefly on the unique form and opening mechanism of the bridge and then turns to the details of some of the novel structural aspects.

Vibration Control Analysis of High-Rise Cantilevered Floors under Pedestrian Walking Loads

2011 ◽  
Vol 94-96 ◽  
pp. 1110-1114
Author(s):  
Man Yi Qi ◽  
Zhi Qiang Zhang ◽  
Fei Ma ◽  
Ai Qun Li
Keyword(s):  
Dynamic Response ◽  
Vibration Control ◽  
Dynamic Characteristics ◽  
Human Activities ◽  
Vertical Vibration ◽  
Control Analysis ◽  
Tuned Mass Dampers ◽  
Human Comfort ◽  
High Rise ◽  
Normal Human

Aimed at the human comfort problem with cantilevered floors arising from normal human activities, the Tuned Mass Dampers are used to control the vibration of the steel cantilevered floors which span 16.3m. Based on studies on the dynamic characteristics of the overall structure, with the position of TMDs optimized and the parameters set reasonably, the vertical vibration response of the cantilevered floors under different cases of pedestrian walking loads is calculated. The results show that the TMD system can effectively reduce the dynamic response of the cantilevered floors, in order to meet the requirements of human comfort.

Human pilot dynamic response in flight and simulator.

1958 ◽  
Author(s):  
Edward Seckel ◽  
Ian A. M. Hall ◽  
Duane T. McRuer ◽  
David H. Weir
Keyword(s):  
Dynamic Response
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