Shaking Table Tests Determining Frequency and Stiffness Before and After Strengthening of a Confined Masonry Wall Without an Opening

2021 ◽  
pp. 129-145
Author(s):  
Emin Mahmud ◽  
Emad Abdulahad
Keyword(s):  
Masonry Wall ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Confined Masonry ◽  
Before And After

Shaking Table Tests on Multi-Leaf Stone Masonry Structures: Analysis of Stiffness Decay

2010 ◽  
Vol 133-134 ◽  
pp. 647-652 ◽  
Author(s):  
Nicola Mazzon ◽  
Cano M. Chavez ◽  
Maria Rosa Valluzzi ◽  
F. Casarin ◽  
Claudio Modena
Keyword(s):  
Dynamic Behaviour ◽  
Shaking Table ◽  
Stone Masonry ◽  
Mode Shapes ◽  
Masonry Structures ◽  
Shaking Table Tests ◽  
Grout Injection ◽  
Hydraulic Lime ◽  
Natural Hydraulic Lime ◽  
Before And After

The influence of the natural hydraulic lime-based grout on the dynamic behaviour of injected multi-leaf stone masonry elements is discussed in the paper. Shaking table experiments on two stone masonry buildings, tested before and after grout injection, have been performed. The paper focuses on the analysis of both the recorded accelerations and related displacements, at the bottom and at each further storey. This leads to evaluate the stiffness of the unstrengthened and injected structures. The input at increasing PGA allowed the stiffness decay to be studied, simulating a gradual damaging of the structures. These results were also interpreted in the light of both computed frequencies and mode shapes. Finally, the comparison among these results, obtained from all the models, allows to deepen the knowledge concerning the effects induced by the lime-based grout injection and on its capability to modify the dynamic behaviour, when intervening on a damaged (repairing) or on an undamaged (strengthening) structure.

Seismic Response of Concrete-Canvas Reinforced Slopes: Influence of Tilt Degrees for Reinforcement

2020 ◽  
Vol 14 (03) ◽  
pp. 2050011
Author(s):  
Lin Zhou ◽  
Guangya Ding ◽  
Jie Tan ◽  
Xiaoxia Zhao ◽  
Jun Wang
Keyword(s):  
Seismic Response ◽  
Threshold Level ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Slope Surface ◽  
Reinforcing Effect ◽  
Failure Patterns ◽  
Coral Sand ◽  
Before And After ◽  
Reinforced Slopes

A series of shaking table tests were conducted on reinforced slopes to study the slope dynamic characteristics. The influence of concrete-canvas tilt degrees on the seismic response was studied. By considering the effects of different concrete-canvas tilt degrees, the seismic responses of the reinforced slopes were analyzed, along with the accelerations, crest settlements, and horizontal displacements. The failure patterns of different model slopes were compared using white coral sand marks placed at designated elevations to monitor the internal slide of the reinforced slopes. Several round markers were placed on the slope surface to compare the deformation before and after shaking with different amplitudes. The results indicated that with the increase in concrete-canvas tilt degrees, a better reinforcing effect was obtained, and 30° reinforcement reached a threshold level, the slide-out point shifts from the crest of the slope to the middle of the reinforced model. The bottom 2/7th zone of the slope was relatively stable during the earthquake and the reinforcement was ineffective at the bottom of the slope. When both considered the influence of reinforcing effect and construction difficulty, 20° is the suitable tilt degree in concrete-canvas reinforced slopes. The characteristics of increasing strength of the concrete canvas make it suitable for the application in slope protection.

scholarly journals Experimental Study on Out-of-Plane Seismic Performance of New Type Masonry System

2021 ◽  
Vol 11 (24) ◽  
pp. 11736
Author(s):  
Ho Choi ◽  
Kang-Seok Lee
Keyword(s):  
Seismic Performance ◽  
Masonry Wall ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Preliminary Calculation ◽  
Four Point Bending ◽  
Out Of Plane ◽  
New Type ◽  
Block Wall ◽  
Joint Mortar

The authors developed two types of block systems, consisting only of main and key blocks, without joint mortar, to improve the in- and out-of-plane seismic performances and enhance the workability. Two types of block systems have different key block shapes. One is the peanuts shape, and the other is the H shape. The proposed block systems have a half-height difference between the main and key blocks, to significantly improve seismic performance in in- and out-of-plane directions, compared to typical masonry wall with joint mortar. In this study, in order to evaluate the out-of-plane seismic performance of the proposed block systems, two types of block walls are experimentally investigated, including the typical block wall. Firstly, the shaking table tests are carried out to investigate the fundamental out-of-plane behaviors of three specimens. Next, four-point bending tests are planned to evaluate the out-of-plane seismic performance, since all specimens do not occur the out-of-plane collapse in the shaking table tests from the preliminary calculation. In this paper, the development of predominant period, profiles of acceleration and displacement, and maximum tensile strength of each specimen are discussed in detail. As a result, the maximum loads of the proposed block walls were about three to four times that of the typical block wall. This result means that the proposed block system has significantly improved seismic performance in the out-of-plane direction.

scholarly journals NUMERICAL SIMULATIONS AND SHAKING TABLE TESTS OF BLOCK MASONRY WALL DURING EARTHQUAKE

2017 ◽  
Vol 73 (2) ◽  
pp. I_181-I_187
Author(s):  
Toshikazu IKEMOTO ◽  
Masakatsu MIYAJIMA ◽  
Takao HASHIMOTO ◽  
Susumu NAKAJIMA ◽  
Torajiro FUJIWARA ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Masonry Wall ◽  
Shaking Table ◽  
Shaking Table Tests

scholarly journals Passive 3D motion optical data in shaking table tests of a SRG-reinforced masonry wall

2016 ◽  
Vol 10 (1) ◽  
pp. 53-71 ◽  
Author(s):  
Gerardo De Canio ◽  
Gianmarco de Felice ◽  
Stefano De Santis ◽  
Alessandro Giocoli ◽  
Marialuisa Mongelli ◽  
...  
Keyword(s):  
Masonry Wall ◽  
Shaking Table ◽  
Optical Data ◽  
Shaking Table Tests ◽  
3D Motion ◽  
Reinforced Masonry

Characteristics of Earthquake Damage for High Core and Concrete-Faced Rock-Fill Dams by Shaking Table Tests

2013 ◽  
Vol 680 ◽  
pp. 194-199
Author(s):  
Lin Juan Yuan ◽  
Xiao Sheng Liu ◽  
Xiao Gang Wang ◽  
Chen Dai
Keyword(s):  
Large Scale ◽  
Residual Deformation ◽  
Horizontal Displacement ◽  
Earthquake Damage ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Earthquake Simulation ◽  
Rock Fill ◽  
Downstream Slope ◽  
Before And After

The pattern and characteristics of seismic damage for Shuangjiangkou ECRD and Houziyan CFRD models were studied through large-scale earthquake simulation shaking table tests in this work. The test results showed that the main earthquake damage pattern of rock-fill dam is permanent residual deformation and shallow slide on the downstream slope. Seismic residual deformation of rock-fill dam, which is filled and compacted well, is very small. Regardless of ECRD or CFRD, the horizontal displacement and settlement on downstream slope are significantly larger than upstream slope under empty reservoir. The analysis of residual deformation and vibration frequency before and after failure indicated that aseismic performance of CFRD is superior to ECRD. Because of the remarkable whipping effect in the high rock-fill dam, the key parts of aseismic design is downstream slope near the dam top, where appropriate aseismic measures should be taken.

Sign in / Sign up

Export Citation Format

Share Document