3D dynamic finite element analyses and 1 g shaking table tests on seismic performance of existing group-pile foundation in partially improved grounds under dry condition

2016 ◽  
Vol 90 ◽  
pp. 196-210 ◽  
Author(s):  
Kheradi Hamayoon ◽  
Yukihiro Morikawa ◽  
Ryosuke Oka ◽  
Feng Zhang
Keyword(s):  
Finite Element ◽  
Seismic Performance ◽  
Pile Foundation ◽  
Shaking Table ◽  
Finite Element Analyses ◽  
Shaking Table Tests ◽  
Dynamic Finite Element ◽  
Group Pile

Seismic performance improvement of ±800 kV UHV DC wall busing using friction ring spring dampers

2020 ◽  
pp. 875529302097098
Author(s):  
Qiang Xie ◽  
Huangbin Liang ◽  
Xiaoyou Wang
Keyword(s):  
Finite Element ◽  
Energy Dissipation ◽  
Performance Improvement ◽  
Seismic Performance ◽  
Direct Current ◽  
Maximum Stress ◽  
Element Model ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Optimum Parameters

Wall bushings that connect converter valves within hall buildings and other electric facilities in a direct current (DC) field are indispensable in substations but vulnerable to earthquakes. A finite element model was developed to evaluate the seismic performance of a real ultra-high-voltage (UHV) DC wall bushing. The numerical results show that the maximum stress of the wall bushing during seismic activity does not satisfy the strength safety factor provisions within Chinese regulations. To improve the seismic performance of the wall bushing, an energy dissipation device composed of eight friction ring spring dampers (FRSDs) was proposed to be installed between the connection plate on which the bushing is mounted and a steel wall frame. In addition, optimum parameters of the FRSDs were researched and determined, then the seismic responses of the wall bushing with and without the FRSDs were compared to evaluate the energy dissipation effects. Full-scale shaking table tests were conducted on a wall bushing with the designed energy dissipation device. The validity of the numerical simulations and effectiveness of the proposed energy dissipation device of the wall bushing were verified by the experimental results in terms of seismic response mitigation.

scholarly journals Seismic performance of group pile foundation with ground improvement during liquefaction

2021 ◽  
Author(s):  
Yasuo Sawamura ◽  
Keita Inagami ◽  
Tomohiko Nishihara ◽  
Takashi Kosaka ◽  
Masahiro Hattori ◽  
...  
Keyword(s):  
Seismic Performance ◽  
Pile Foundation ◽  
Ground Improvement ◽  
Group Pile

Finite element formulation and shaking table tests of direction-optimized-friction-pendulum system

2008 ◽  
Vol 30 (9) ◽  
pp. 2321-2329 ◽  
Author(s):  
C.S. Tsai ◽  
Po-Ching Lu ◽  
Wen-Shin Chen ◽  
Tsu-Cheng Chiang ◽  
Chen-Tsung Yang ◽  
...  
Keyword(s):  
Finite Element ◽  
Shaking Table ◽  
Finite Element Formulation ◽  
Element Formulation ◽  
Shaking Table Tests ◽  
Pendulum System ◽  
Friction Pendulum ◽  
Friction Pendulum System

Computer Simulation of the Shaking Table Tests on Harder Soil-Structure Interaction System

2011 ◽  
Vol 261-263 ◽  
pp. 1619-1624
Author(s):  
Pei Zhen Li ◽  
Jing Meng ◽  
Peng Zhao ◽  
Xi Lin Lu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Soil Structure ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Soil Structure Interaction ◽  
Shaking Table Tests ◽  
Site Condition ◽  
Element Analysis ◽  
Structure Interaction

Shaking table test on soil-structure interaction system in harder site condition is presented briefly in this paper. Three-dimensional finite element analysis on shaking table test is carried out using ANSYS program. The surface-to-surface contact element is taken into consideration for the nonlinearity of the state of the interface of the soil-pile and an equivalent linear model is used for soil behavior. By comparing the results of the finite element analysis with the data from shaking table tests, the computational model is validated. Based on the calculation results, the paper gives the seismic responses under the consideration of soil-structure interaction in harder site condition, including acceleration response, contact analysis on soil pile interface and so on.

scholarly journals Experimental estimation of energy dissipated by multistorey post-tensioned timber framed buildings with anti-seismic dissipative devices

2021 ◽  
Vol 1 (2) ◽  
Keyword(s):  
Seismic Performance ◽  
Environmental Sustainability ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Braced Frame ◽  
Timber Frame ◽  
Experimental Estimation ◽  
Energy Dissipated ◽  
The University ◽  
Post Tensioned

The need to satisfy high seismic performance of structures and to comply with the latest worldwide policies of environmental sustainability is leading engineers and researchers to higher interest in timber buildings. A post-tensioned timber frame specimen was tested at the structural laboratory of the University of Basilicata in Italy, in three different configurations: i) without dissipation (post-tensioning only-F configuration); ii) with dissipative angles (DF- dissipative rocking configuration) and iii) with dissipative bracing systems (BF - braced frame configuration). The shaking table tests were performed considering a set of spectra-compatible seismic inputs at different seismic intensities. This paper describes the experimental estimation of energy dissipated by multistorey post-tensioned timber prototype frame with different anti-seismic hysteretic dissipative devices used in the DF and BF testing configurations. The main experimental seismic key parameters have also been investigated in all testing configurations.

scholarly journals Seismic Protection of Cabinet Stored Cultural Relics with Silicone Dampers

2018 ◽  
Vol 2018 ◽  
pp. 1-15
Author(s):  
Xiaoqing Ning ◽  
Junwu Dai ◽  
Wen Bai ◽  
Yongqiang Yang ◽  
Lulu Zhang
Keyword(s):  
Numerical Simulation ◽  
Seismic Performance ◽  
Shaking Table ◽  
Seismic Protection ◽  
Shaking Table Tests ◽  
Seismic Methods ◽  
Cultural Relics

Cultural relics are precious properties of all humankind, the damage of which is nonresilient. In previous earthquakes, stored cultural relics have shown poor seismic performance, so effective seismic methods are urgently needed. However, due to various restrictions, traditional damping methods are not suitable for the cultural relics stored in the Palace Museum. An efficient damping method, composed of silicone damper and connecting elements, is proposed to protect these stored cultural relics. This novel damping device is very convenient to install and no change or move for the original structures is needed. It is suitable for various kinds of new and existing relic cabinets. In order to validate the effectiveness of this novel damping method, both numerical simulation and shaking table tests are carried out. Results show that this method can effectively enhance the seismic performance of relic cabinet itself and the internal cultural relics. Relic cabinets with damping devices deform significantly less than noncontrol cabinets while the inside relics also have less sliding or overturning. Overall, a damping method, designed for seismic protection of cabinet stored cultural relics, is proposed and its effectiveness has been successfully demonstrated.

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