Case Studies for Shaking Table Tests on Seismic Soil-Pile Group-Bridge Structure Interaction in Liquefiable Ground

ICCTP 2009 ◽  
2009 ◽  
Author(s):  
Liang Tang ◽  
Xianzhang Ling ◽  
Pengju Xu ◽  
Xia Gao ◽  
Liquan Wu
Keyword(s):  
Case Studies ◽  
Pile Group ◽  
Shaking Table ◽  
Bridge Structure ◽  
Shaking Table Tests ◽  
Structure Interaction

Seismic Response of Pile Groups Improved with Deep Cement mixing Columns in Liquefiable Sand: Shaking Table Tests

2021 ◽  
Author(s):  
Dingwen Zhang ◽  
Anhui Wang ◽  
Xuanming Ding
Keyword(s):  
Seismic Behavior ◽  
Lateral Displacement ◽  
Bending Moment ◽  
Pile Group ◽  
Shaking Table ◽  
Excess Pore Pressure ◽  
Shaking Table Tests ◽  
Pile Groups ◽  
Acceleration Response ◽  
Table Model

A series of shaking table model tests were performed to examine the effects of deep cement mixing (DCM) columns with different reinforcement depths on the seismic behavior of a pile group in liquefiable sand. Due to the DCM column reinforcement, the fundamental natural frequency of the model ground increases noticeably. The excess pore pressure of soils reduces with the increase of reinforcement depths of the DCM columns. Before liquefaction, the acceleration response of soils in the improved cases is obviously lower than that in the unimproved case, but the acceleration attenuation is greater after liquefaction in the unimproved case. Moreover, the lateral displacement of the superstructure, the settlement of the raft, and the bending moment of the piles in the improved cases are significantly reduced compared to those in the unimproved case, and the reduction ratios rise with the increase of reinforcement depth of the DCM columns. However, reinforcement by the DCM columns may result in the variation of the location of the maximum moment that occurs in the pile.

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 Dynamic Seismic Response of Nonlinear Displacement Dependent Devices versus Testing Required by Codes: Experimental Case Studies

2020 ◽  
Vol 10 (24) ◽  
pp. 8857
Author(s):  
Antonio Di Cesare ◽  
Felice Carlo Ponzo ◽  
Nicla Lamarucciola ◽  
Domenico Nigro
Keyword(s):  
Case Studies ◽  
Production Control ◽  
Shaking Table ◽  
Cyclic Behavior ◽  
Shaking Table Tests ◽  
Ground Acceleration ◽  
Testing Procedures ◽  
Shaking Table Testing ◽  
Number Of Cycles ◽  
Hysteretic Dampers

Passive energy dissipation systems are one of the most resilient solutions to mitigate the seismic risk of structures. In case of strong motions, they can confine the eventual damages into easily replaceable anti-seismic devices. The performance characteristics of nonlinear displacement dependent devices (NLD) shall be defined by the force-displacement cyclic behavior, as well as the expected number of cycles related to both the duration of the earthquake and to the fundamental frequency of the structural systems. The aims of this paper are the comparison between the dynamic results of two different experimental campaigns performed on NLDs included in dissipative bracing systems and the assessment of the reliability of quasi-static testing procedures proposed by current seismic codes for type tests and factory production control tests. The number of cycles under the design earthquake of hysteretic dampers were experimentally evaluated through shaking table testing. Two experimental case studies of a two-story steel frame and of a three-story post-tensioned timber frame both with bracing systems including flexural steel dampers, hysteretic dampers (HDs), and U-shaped flexural plates (UFPs) respectively, were analyzed. Controlled-displacement tests of NLDs were performed considering quasi-static loading procedures specified by codes. Shaking table tests were carried out considering almost the same seismic sequence composed by a set of seven natural earthquakes at increasing peak ground acceleration (PGA) levels. More than one hundred inelastic cycles were experimentally recorded from dynamic tests before the failure of devices in both cases. In line with American standards testing requirements, the number of cycles at the design PGA level, estimated from shaking table tests and from non-linear dynamic analyses, shows a decreasing trend with the increase of ductility demand.

Representation of Soil-Foundation Systems and Its Application to Shaking Table Tests by Constructing a Mechanical Interface

2013 ◽  
Vol 29 (2) ◽  
pp. 547-571
Author(s):  
Masato Saitoh ◽  
Tomoya Saito ◽  
Toshifumi Hikima ◽  
Makoto Ozawa ◽  
Keiichi Imanishi
Keyword(s):  
Experimental Studies ◽  
Pile Group ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Soil Medium ◽  
Lumped Parameter ◽  
Mechanical Interface ◽  
Foundation Model ◽  
Soil Foundation ◽  
Impedance Functions

Experimental studies on the dynamic response of structures comprising soil-foundation systems require an appropriately constructed soil-foundation model below the superstructures in order to properly estimate structural responses. In most studies, applying a small scaling is necessary for constructing the entire structural system, since there is limited space on shaking tables. This constraint has been a hindrance in experimental studies. Thus this study proposes a mechanical interface (MI) that represents the impedance characteristics of a 3 × 5 pile group embedded in a layered soil medium. The MI is constructed on the basis of lumped parameter models with gyro-mass elements. This element is mechanically realized in the MI using a rotational mass in combination with coupling gears. The results show that the MI properly simulates the impedance functions with frequency-dependent oscillations, and shaking table tests using the MI for an inelastic structure are demonstrated.

scholarly journals Responses of Liquefiable Soils in Pile Group Foundations of Tall Buildings from Shaking Table Tests

2016 ◽  
Vol 15 (2) ◽  
pp. 311-318 ◽  
Author(s):  
Peizhen Li ◽  
Jinping Yang ◽  
Zheng Lu ◽  
Xilin Lu
Keyword(s):  
Tall Buildings ◽  
Pile Group ◽  
Shaking Table ◽  
Shaking Table Tests

scholarly journals Seismic behavior of pile group in soil slope

2021 ◽  
Author(s):  
Mehdi Zadehmohamad ◽  
Majid Moradi ◽  
Abbas Ghalandarzadeh
Keyword(s):  
Relative Density ◽  
Seismic Behavior ◽  
Pile Group ◽  
Slope Movement ◽  
Shaking Table ◽  
Soil Slope ◽  
Shaking Table Tests ◽  
Pile Groups ◽  
Constant Frequency

Seismic behavior of pile group in slope is interested for many years by researchers .Inthis research Shaking table tests were conducted by means of a rigid-box with 1.8m in length,0.8 in width and 1.2 in height in order to investigate the effects of the location of pile group insand slope on its seismic behavior .A cap supported by a pile group was set in a dry sandslope, and subjected to sinusoidal base motion with constant frequency. Soil used in this studywas firoozkuh sand 161 with 60% relative density. The tests were scaled at 1/10th and the pileswere made from aluminum with 95cm in length and they have fixed head condition.Discussions are focused on the behavior of pile groups in different situations. Main interestsare recognition the effect of slope movement and location of pile group on bending behaviorof piles.

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