Dynamic behavior and seismic performance of base-isolated structures with electromagnetic inertial mass dampers: Analytical solutions and simulations

2021 ◽  
Vol 246 ◽  
pp. 113072
Author(s):  
Heng Wang ◽  
Wenai Shen ◽  
Yamin Li ◽  
Hongping Zhu ◽  
Songye Zhu
Keyword(s):  
Dynamic Behavior ◽  
Seismic Performance ◽  
Analytical Solutions ◽  
Inertial Mass ◽  
Isolated Structures

Shaking Table Test on Unreinforced Stone Masonry Pagoda

2012 ◽  
Vol 166-169 ◽  
pp. 730-733 ◽  
Author(s):  
Fei Zhu ◽  
Feng Lai Wang ◽  
Xu Jie Sun ◽  
Y. Zhao
Keyword(s):  
Dynamic Behavior ◽  
Seismic Performance ◽  
Seismic Design ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Cultural Value ◽  
Scale Model ◽  
Stone Masonry ◽  
Experimental Program ◽  
Ancient China

Unreinforced stone masonry pagodas have great cultural value and should be detailed investigation its mechanical properties. These buildings were not designed to resist earthquakes in ancient China, at least not in the way of current methods. The objectives of this research were to understand the dynamic behavior of unreinforced stone masonry pagoda and its seismic performance. To accomplish these, a 1/12 scale model of China Dinosaurs Pagoda was constructed and tested on shaking table. The octangle model height is 3.96m, with aspect ratio of height to width is 2.93, both parameters exceed the stipulated limit of Code for Seismic Design of Building. The model built with the stones and motars similar to the prototype materials and the arrangements. Its dynamic behavior and seismic performance were tested on the shaking table towards the free vibration and three earthquake waves. The experimental program adopted in the research is explained in this paper.

Study on Dynamic Behavior and Seismic Performance of Cable-Stayed Bridge with Different Auxiliary Pier Positions

2014 ◽  
Vol 587-589 ◽  
pp. 1655-1658
Author(s):  
Bu Yu Jia ◽  
Xiao Lin Yu ◽  
Kang Huang ◽  
Quan Sheng Yan
Keyword(s):  
Dynamic Behavior ◽  
Seismic Performance ◽  
Bending Moment ◽  
Cable Stayed Bridge ◽  
Pile Caps

Choosing the Panzhong Bridge of the Guangzhongjiang highway as the research object, the dynamic behavior and seismic performance of cable-stayed bridge with different auxiliary pier positions were studied. The results show that the position of the auxiliary pier has limited influence on dynamic behavior. Under the action of the earthquake, auxiliary pier restricts the deformation of side span effectively and reduces the bending moment at bottom of the pile caps.

Experiments on Seismic Performance of Piping Mounted to a Concrete Floor by Post-Installed Anchors

2015 ◽  
Author(s):  
Fabian Dwenger ◽  
Klaus Kerkhof ◽  
Veit Birtel ◽  
Thilo Froehlich
Keyword(s):  
Numerical Simulations ◽  
Dynamic Behavior ◽  
Seismic Performance ◽  
Power Plants ◽  
Failure Modes ◽  
Coupled System ◽  
Contact Problems ◽  
System Response ◽  
Concrete Floor ◽  
Stiffness Reduction

In nuclear power plants, non-structural systems such as piping are often connected to concrete floors by post-installed anchors. During an earthquake, the anchors have to transfer the dynamic loads between the structural and mechanical components of the power plant. The dynamic behavior of the coupled system concrete-anchor-piping is not only governed by the main components but also by the load-bearing behavior of the anchors and the dynamic behavior of pipe supports. Stiffness reduction of supports can lead to contact problems. Impact loads due to gaps between the anchor plate and concrete floor occur when the anchors show significant displacements. Uncertainties concerning possible interactions of the coupled system concrete-anchor-piping can lead to unexpected failure modes during the system response. To investigate these possible interactions, experiments and detailed numerical simulations regarding the dynamic behavior of the coupled system concrete-anchor-piping are carried out. Results of experiments and numerical simulations on the seismic performance of a mock-up consisting of piping, anchors and a structural concrete member subjected to crack cycling are presented.

The Influence of Mexico City Soils on the Seismic Performance of Friction Damped and Base Isolated Structures

1990 ◽  
Vol 6 (2) ◽  
pp. 335-352 ◽  
Author(s):  
A. Filiatrault ◽  
S. Cherry ◽  
P. M. Byrne
Keyword(s):  
Mexico City ◽  
Seismic Performance ◽  
Soil Structure ◽  
Soil Structure Interaction ◽  
Friction Damping ◽  
Framed Structures ◽  
Structure Interaction ◽  
High Rise ◽  
Isolated Structures ◽  
Base Isolators

The seismic performance of hypothetical low and high-rise steel framed structures founded on both soft and stiff soils in Mexico City and equipped with (i) friction damping devices, (ii) base isolators and (iii) a combination of base isolators and friction damping devices is compared. The response of the three structural systems, including soil- structure interaction, is examined for two specific sites in Mexico City: the stiff hills zone and the soft lake bed zone. The results of the study show that although soil-structure interaction can be beneficial for some base isolated structures, friction damping alone provides a more consistent way of protecting structures in Mexico City against earthquakes.

Shaking table and pseudodynamic tests for the evaluation of the seismic performance of base-isolated structures

1999 ◽  
Vol 21 (4) ◽  
pp. 365-379 ◽  
Author(s):  
Woo-Jung Chung ◽  
Chung-Bang Yun ◽  
Nam-Sik Kim ◽  
Ju-Won Seo
Keyword(s):  
Seismic Performance ◽  
Shaking Table ◽  
Isolated Structures

scholarly journals Implementation of a Novel Inertial Mass System and Comparison to Existing Mass-Rig Systems for Shake Table Experiments

2021 ◽  
Vol 11 (2) ◽  
pp. 692
Author(s):  
Alvaro Lopez ◽  
Peter Dusicka
Keyword(s):  
Seismic Performance ◽  
Large Scale ◽  
Inertial Mass ◽  
Setup Time ◽  
Shake Table ◽  
Shake Table Testing ◽  
Earthquake Excitation ◽  
Mass System ◽  
Using Data ◽  
Shake Table Experiments

Shake table testing is one of the more effective experimental approaches used to study and evaluate seismic performance of structures. Reduced-scale models can still result in large-scale specimens where incorporating the required inertial mass effectively and safely can be challenging. This study proposes a new system of arranging the mass in the experiments that combines the realism of mass participation during earthquake excitation when supported by the shake table with laboratory practicality considerations of the mass positioned off the specimen. The characteristics and dynamic motion equations for the proposed system are described and applied to shake table experiments involving large-scale cantilevered columns. Using data from large-scale experiments to validate a numerical model, the proposed approach was numerically compared to two other testing approaches. Based on the measured performance and the validated numerical simulations, it can be concluded that the proposed inertial mass system can result in seismic performance as if the mass was placed directly on top of the specimen. Combined with the advantages of reduced setup time, incorporating safety restraints and direct measurement of inertial loads, the proposed system can be suitably used for effective shake table testing of large-scale specimens taken to non-linear near-collapse performance levels.

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