Seismic behavior of three-leaf stone masonry buildings before and after interventions: Shaking table tests on a two-storey masonry model

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.

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Numerical Simulation of Shaking Table Tests on Full-Scale Stone Masonry Buildings

International Journal of Architectural Heritage ◽

10.1080/15583058.2015.1113338 ◽

2015 ◽

Vol 10 (2-3) ◽

pp. 146-163 ◽

Cited By ~ 18

Author(s):

Andrea Penna ◽

Ilaria Senaldi ◽

Alessandro Galasco ◽

Guido Magenes

Keyword(s):

Numerical Simulation ◽

Full Scale ◽

Shaking Table ◽

Stone Masonry ◽

Masonry Buildings ◽

Shaking Table Tests

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

Canadian Geotechnical Journal ◽

10.1139/cgj-2020-0505 ◽

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.

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

Journal of Earthquake and Tsunami ◽

10.1142/s1793431120500116 ◽

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.

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Shaking table tests on seismic behavior of the underground loess cave of earth building of traditional dwellings

Engineering Structures ◽

10.1016/j.engstruct.2020.110221 ◽

2020 ◽

Vol 207 ◽

pp. 110221

Author(s):

Jianyang Xue ◽

Xiangbi Zhao ◽

Fengliang Zhang ◽

Dan Xu ◽

Xiaofeng Hu ◽

...

Keyword(s):

Seismic Behavior ◽

Shaking Table ◽

Shaking Table Tests

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PERFORMANCE COMPARISON BETWEEN UNREINFORCED AND CONFINED MASONRY BUILDINGS SUBJECTED TO SHAKING TABLE TESTS

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015) ◽

10.7712/120119.6921.19284 ◽

2019 ◽

Cited By ~ 1

Author(s):

Chiara Pepi ◽

Nicola Cavalagli ◽

Matteo Ciano ◽

Massimiliano Gioffrè ◽

Vittorio Gusella

Keyword(s):

Performance Comparison ◽

Shaking Table ◽

Masonry Buildings ◽

Shaking Table Tests ◽

Confined Masonry

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Shaking Table Tests of a Typical Mexican Colonial Temple: Evaluation of Two Retrofitting Techniques

Earthquake Spectra ◽

10.1193/030512eqs064m ◽

2013 ◽

Vol 29 (4) ◽

pp. 1209-1231 ◽

Cited By ~ 1

Author(s):

Marcos Chávez ◽

Roberto Meli

Keyword(s):

Energy Dissipation ◽

Research Program ◽

Maximum Intensity ◽

Shaking Table ◽

Scale Model ◽

Stone Masonry ◽

Significant Source ◽

Second Phase ◽

Shaking Table Tests ◽

Displacement Capacity

This paper reports the results of the second phase of a research program that carried out shaking table tests on a scale model of a typical stone masonry temple. This second phase evaluates the efficacy of two different retrofitting techniques by comparing the response of the retrofitted models with that of the original unreinforced model. It was found that both retrofitting schemes substantially enhanced the performance of the model temple. The maximum intensity of the base motion for which damage was considered to be still repairable increased by 80% and 120% for the first and the second levels of retrofitting, respectively. In terms of displacement capacity, the response of the model with the second level of retrofit reached a maximum drift of 0.4%. The initial damping ratios were found to be in the range of 7% to 9%, both in the original and the retrofitted models. These ratios constitute a significant source of energy dissipation for this kind of structure.

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