Failure mechanism of steel arch trusses: Shaking table testing and FEM analysis

2015 ◽  
Vol 82 ◽  
pp. 186-198 ◽  
Author(s):  
Qing-Hua Han ◽  
Ying Xu ◽  
Yan Lu ◽  
Jie Xu ◽  
Qiu-Hong Zhao
Keyword(s):  
Failure Mechanism ◽  
Fem Analysis ◽  
Shaking Table ◽  
Shaking Table Testing

scholarly journals Performance of the CGS six DOF Shaking Table on the Harmonic Signal Reproduction

2017 ◽  
Vol 62 (1) ◽  
pp. 102-111
Author(s):  
Abdelhalim Airouche ◽  
Hassan Aknouche ◽  
Hakim Bechtoula ◽  
Nourredine Mezouer ◽  
Abderrahmane Kibboua
Keyword(s):  
Adaptive Control ◽  
Earthquake Engineering ◽  
Harmonic Signal ◽  
Shaking Table ◽  
Experimental Procedure ◽  
Signal Tracking ◽  
Engineering Research ◽  
Control Techniques ◽  
Shaking Table Testing ◽  
Six Dof

Shaking table testing continues to play an important role in earthquake engineering research. It has been recognized as a powerful testing method to evaluate structural components and systems under realistic dynamic loads. Although it represents a very attractive experimental procedure, many technical challenges, which require attention and consideration, still remain. High fidelity in signal reproduction is the focus of the work presented in this paper. The main objective of this paper is to investigate the capabilities of adaptive control techniques based on Amplitude Phase Control (APC) and Adaptive Harmonic Cancellation (AHC) on the harmonic signal tracking performance of the shaking table. A series of 232 sinusoidal command waveforms with various frequencies and amplitudes were conducted on the shaking table of the laboratory of the National Earthquake Engineering Applied Research Center (CGS, Algeria). Experimental results are reported and recommendations on the use of these adaptive control techniques are discussed.

scholarly journals Failure Characteristics and Mechanism of Multiface Slopes under Earthquake Load Based on PFC Method

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Tao Yang ◽  
Yunkang Rao ◽  
Huailin Chen ◽  
Bing Yang ◽  
Jiangrong Hou ◽  
...  
Keyword(s):  
Moisture Content ◽  
Failure Mechanism ◽  
Failure Modes ◽  
Shear Failure ◽  
Shaking Table ◽  
Tensile Failure ◽  
Particle Flow Code ◽  
Shear Cracks ◽  
Local Shear ◽  
Shear Slip

Understanding the failure mechanism and failure modes of multiface slopes in the Wenchuan earthquake can provide a scientific guideline for the slope seismic design. In this paper, the two-dimensional particle flow code (PFC2D) and shaking table tests are used to study the failure mechanism of multiface slopes. The results show that the failure modes of slopes with different moisture content are different under seismic loads. The failure modes of slopes with the moisture content of 5%, 8%, and 12% are shattering-shallow slip, tension-shear slip, and shattering-collapse slip, respectively. The failure mechanism of slopes with different water content is different. In the initial stage of vibration, the slope with 5% moisture content produces tensile cracks on the upper surface of the slope; local shear slip occurs at the foot of the slope and develops rapidly; however, a tensile failure finally occurs. In the slope with 8% moisture content, local shear cracks first develop and then are connected into the slip plane, leading to the formation of the unstable slope. A fracture network first forms in the slope with 12% moisture content under the shear action; uneven dislocation then occurs in the slope during vibration; the whole instability failure finally occurs. In the case of low moisture content, the tensile crack plays a leading role in the failure of the slope. But the influence of shear failure becomes greater with the increase of the moisture content.

Investigation into dynamic response of regional sites to seismic waves using shaking table testing

2015 ◽  
Vol 14 (3) ◽  
pp. 411-421 ◽  
Author(s):  
Yadong Li ◽  
Jie Cui ◽  
Tianding Guan ◽  
Liping Jing
Keyword(s):  
Dynamic Response ◽  
Seismic Waves ◽  
Shaking Table ◽  
Shaking Table Testing

scholarly journals Analysis of the Effects of Soil on the Seismic Energy Responses of an Equipment-Structure System via Substructure Shaking Table Testing

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Lanfang Luo ◽  
Nan Jiang ◽  
Jihong Bi
Keyword(s):  
Seismic Design ◽  
Seismic Energy ◽  
Shaking Table ◽  
Input Energy ◽  
Test Results ◽  
Element Analysis ◽  
Testing Method ◽  
Shaking Table Testing ◽  
Soil Effects ◽  
Substructure Approach

This study investigated the real-time substructure shaking table testing (RTSSTT) of an equipment-structure-soil (ESS) system and the effects of soil on the seismic energy responses of the equipment-structure (ES) subsystem. First, the branch modal substructure approach was employed to derive the formulas needed for the RTSSTT of the ESS system. Then, individual equations for calculating the energy responses of the equipment and the structure were provided. The ES subsystem was adopted as the experimental substructure, whereas the reduced soil model was treated as the numerical substructure when the RTSSTT was performed on the ESS system. The effectiveness of the proposed testing method was demonstrated by comparing the test results with those of the integrated finite element analysis. The energy responses of the ES subsystem in the case of rigid ground (i.e., the ES system) were compared with those considering the effects of soil (i.e., the ESS system). The input energy responses of the ES subsystem were found to decrease significantly after taking the effects of soil into account. Differences due to the soil effects should be considered in the seismic design for the ES system.

Displacement-Based Seismic Assessment of Low-Height Confined Masonry Buildings

2009 ◽  
Vol 25 (2) ◽  
pp. 439-464 ◽  
Author(s):  
Amador Terán-Gilmore ◽  
Oscar Zuñiga-Cuevas ◽  
Jorge Ruiz-García
Keyword(s):  
Pushover Analysis ◽  
Relative Strength ◽  
Seismic Assessment ◽  
Shaking Table ◽  
Evaluation Procedure ◽  
Masonry Buildings ◽  
Confined Masonry ◽  
Shaking Table Testing ◽  
Displacement Based ◽  
Global And Local

This paper presents a practical displacement-based evaluation procedure for the seismic assessment of low-height regular confined masonry buildings. First, the so-called Coefficient Method established in several FEMA documents is adapted to obtain rapid estimates of inelastic roof displacement demands for regular confined masonry buildings. For that purpose, a statistical study of constant relative strength inelastic displacement ratios of single-degree-of-freedom systems representing confined masonry buildings is carried out. Second, a nonlinear simplified model is introduced to perform pushover analysis of regular confined masonry buildings whose global and local behavior is dominated by shear deformations in the masonry walls. The model, which can be applied through the use of commercial software, can be used to establish the capacity curve of such buildings. Finally, the evaluation procedure is applied to a three-story building tested at a shaking table testing facility.

scholarly journals Scaling laws for shaking table testing of reinforced concrete tunnels accounting for post-cracking lining response

2020 ◽  
Vol 101 ◽  
pp. 103353
Author(s):  
Maria Antoniou ◽  
Nikolaos Nikitas ◽  
Ioannis Anastasopoulos ◽  
Raul Fuentes
Keyword(s):  
Reinforced Concrete ◽  
Scaling Laws ◽  
Shaking Table ◽  
Shaking Table Testing ◽  
Lining Response
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