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Behavior of braced wall embedded in saturated liquefiable sand under seismic loading

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Earthquake Engineering and Engineering Vibration 2021年第2期20卷 361-375页

作者： Sanku Konai aniruddha sengupta Kousik Deb Department of Civil Engineering Indian Institute of Technology KharagpurKharagpur 721302India

It is well known that the generation of excess pore water pressure and/or liquefaction in foundation soils during an earthquake often cause structural *** paper describes the behavior of a small-scale braced wall embedded in saturated liquefiable sand under dynamic *** table tests are performed in the laboratory on embedded retaining walls with single *** tests are conducted for different excavation depths and base *** influences of the peak magnitude of the ground motions and the excavation depth on the axial forces in the bracing,the lateral displacement and the bending moments in the braced walls are *** shake table tests are simulated numerically using FLAC 2D and the results are compared with the corresponding experimental *** pore water pressures developed in the soil are found to influence the behavior of the braced wall structures during a dynamic *** is found that the excess pore water pressure development in the soil below the excavation is higher compared to the soil beside the ***,the soil below the excavation level is more susceptible to the liquefaction compared to the soil beside the walls.

关键词： braced wall FLAC 2D liquefaction seismic analysis shake table test

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Seismic behavior of cantilever wall embedded in dry and saturated sand

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Frontiers of Structural and Civil Engineering 2020年第3期14卷 690-705页

作者： Sanku KONAI aniruddha sengupta Kousik DEB Department of Civil Engineering Indian Institute of Technology KharagpurKharagpur 721302India

The embedded cantilever retaining walls are often required for excavation to construct the undergroundfacilities. Significant numbers of numerical and experimental studies have been performed to understand the behavior ofembedded cantilever retaining walls under static condition. However, very limited studies have been conducted on thebehavior of embedded retaining walls under seismic condition. In this paper, the behavior of a small scale modelembedded cantilever retaining wall in dry and saturated sand under seismic loading condition is investigated by shaketable tests in the laboratory and numerically using software FLAC2D. The embedded cantilever walls are subjected tosinusoidal dynamic motions. The behaviors of the cantilever walls in terms of lateral displacement and bending momentare studied with the variation of the two important design parameters, peak amplitude of the base motions and excavationdepth. The variation of the pore water pressures within the sand is also observed in the cases of saturated sand. Themaximum lateral displacement of a cantilever wall due to seismic loading is below 1% of the total height of the wall in drysand, but in case of saturated sand, it can go up to 12.75% of the total height of the wall.

关键词： embedded cantilever wall shake table test FLAC2D seismic loading,saturated and dry sand

Behavior of braced excavation in sand under a seismic condition: experimental and numerical studies

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 311-324页

作者： Sanku Konai aniruddha sengupta Kousik Deb Department of Civil Engineering Indian Institute of Technology Kharagpur

The behavior of braced excavation in dry sand under a seismic condition is investigated in this paper.A series of shake table tests on a reduced scale model of a retaining wall with one level of bracing were conducted to study the effect of different design parameters such as excavation depth,acceleration amplitude and wall *** analyses using FLAC 2D were also performed considering one level of *** strut forces,lateral displacements and bending moments in the wall at the end of earthquake motion were compared with experimental *** study showed that in a post-seismic condition,when other factors were constant,lateral displacement,bending moment,strut forces and maximum ground surface displacement increased with excavation depth and the amplitude of base *** study also showed that as wall stiffness decreased,the lateral displacement of the wall and ground surface displacement increased,but the bending moment of the wall and strut forces *** net earth pressure behind the walls was influenced by excavation depth and the peak acceleration amplitude,but did not change significantly with wall *** force was the least affected parameter when compared with others under a seismic condition.

关键词： braced excavation shake table test seismic FLAC 2D displacement

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Performance of sand and shredded rubber tire mixture as a natural base isolator for earthquake protection

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Earthquake Engineering and Engineering Vibration 2015年第4期14卷 683-693页

作者： Srijit Bandyopadhyay aniruddha sengupta G.R.Reddy Indian Institute of Technology Kharagpur Structural & Seismic Engineering Section Homi Bhaba National Institute

The performance of a well-designed layer of sand, and composites like layer of sand mixed with shredded rubber tire (RSM) as low cost base isolators, is studied in shake table tests in the laboratory. The building foundation is modeled by a 200 mm by 200 mm and 40 mm thick rigid plexi-glass block. The block is placed in the middle of a 1m by 1m tank filled with sand. The selected base isolator is placed between the block and the sand foundation. Accelerometers are placed on top of the footing and foundation sand layer. The displacement of the footing is also measured by LVDT. The whole setup is mounted on a shake table and subjected to sinusoidal motions with varying amplitude and frequency. Sand is found to be effective only at very high amplitude (> 0.65 g) of motions. The performance of a composite consisting of sand and 50% shredded rubber tire placed under the footing is found to be most promising as a low-cost effective base isolator.

关键词： shake table test base isolation shredded rubber tire model test

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Golgi localization and dynamics of hyaluronan binding protein 1 (HABP1/p32/C1QBP) during the cell cycle

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Cell Research 2005年第3期15卷 183-186页

作者： aniruddha sengupta,Bhaswati BANERJEE,Rakesh K. TYAGI,Kasturi DATTA Biochemistry Laboratory School of Environmental Sciences Jawaharlal Nehru University New Delhi-110067 India Biochemistry Laboratory School of Environmental Sciences Jawaharlal Nehru University New Delhi-110067 India Special Centre for Molecular Medicine Jawaharlal Nehru University New Delhi India Biochemistry Laboratory School of Environmental Sciences Jawaharlal Nehru University New Delhi-110067 India2Special Centre for Molecular Medicine Jawaharlal Nehru University New Delhi India

Hyaluronan binding protein 1 (HABP1) is a negatively charged multifunctional mammalian protein with a unique structural fold. Despite the fact that HABP1 possesses mitochondrial localization signal, it has also been localized to other cellular compartments. Using indirect immunofluorescence, we examined the sub-cellular localization of HABP1 and its dynamics during mitosis. We wanted to determine whether it distributes in any distinctive manner after mitotic nuclear envelope disassembly or is dispersed randomly throughout the cell. Our results reveal the golgi localization of HABP1 and demonstrate its complete dispersion throughout the cell during mitosis. This distinctive distribution pattern of HABP1 during mitosis resembles its ligand hyaluronan, suggesting that in concert with each other the two molecules play critical roles in this dynamic process.

关键词： Hyaluronan Binding Protein 1 (HABP1) hyaluronan sub-cellular localization golgi mitosis.