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Numerical investigation of the ultimate lateral resistance of piles in soft clay

Konstantinos P. TZIVAKOS,Michael J. KAVVADAS

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 2,   Pages 194-200 doi: 10.1007/s11709-014-0251-0

Abstract: The paper presents a numerical study on the undrained lateral response of a single, free-head, reinforced concrete pile in soft clays. Soil conditions simulating normally consolidated clays are examined—undrained shear strength increasing with depth—and the pile-soil interaction under static lateral loading is analyzed. The nonlinear ? curves proposed in literature for soft clays are imported into a beam-on-nonlinear-Winkler-foundation simulation in order to predict the pile head lateral load—displacement curve and the distribution of the horizontal displacement and bending moment along the pile. The striking differences among these methods require further investigation via 3D finite element analyses. The determination of the ultimate soil resistance from the results of the finite element analyses aims at providing the estimation of a range of values for the ultimate soil resistance coefficient with depth and the comparison of the derived values to the corresponding ones proposed by existing methodologies.

Keywords： laterally loaded     pile     soft clay     p?y curves     finite element method (FEM)    

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PM-support interfacial effect and oxygen mobility in Pt, Pd or Rh-loaded (Ce,Zr,La)O catalysts

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 4, doi: 10.1007/s11783-020-1369-z

Abstract:

• Pt/CZL exhibits the optimum catalytic performance for HC and NOx elimination.

Keywords： Precious metal-loaded (Ce     Zr     La)O2 catalysts     Oxygen mobility     Catalytic performance    

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The cavitation erosion damage process of dynamically loaded journal bearings

MA Yan-yan, CHENG Xian-hua

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 4,   Pages 461-464 doi: 10.1007/s11465-006-0059-2

Abstract: The cavitation damage model was built using finite element analysis software MSC.Marc. This paper attempted to numerically analyze the action process based on damage mechanics when a jet created by bubble collapse acted on the bearing surface in the process of cavitation erosion. The numerical results show that the values of equivalent plastic strain and void volume fraction increase with time. The values of damage scalar are higher on the bearing surface and subsurface, and decrease when it approaches the interface of overlay and nickel layer. The strain history and damage evolvement of bearing material acted on by jet impact load can be calculated efficiently using the proposed method, which develops a new method of analyzing cavitation erosion failure of the bearing surface.

Keywords： bearing     fraction increase     collapse     process     evolvement    

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Numerical study of axial-loaded circular concrete-filled aluminum tubular slender columns

Frontiers of Structural and Civil Engineering 2024, Volume 18, Issue 2,   Pages 272-293 doi: 10.1007/s11709-024-1000-7

Abstract: Aluminum alloys have been widely applied in coastal and marine structures because of their superior sustainability and corrosion resistance. Concrete-filled double-skin aluminum tubular columns (CFDAT) possess higher strength and better ductility than traditional reinforced concrete structures. However, few studies have been conducted on numerical simulation methods for circular CFDATs. Specifically, there has been no experimental or numerical study on intermediate-to-slender circular CFDATs. Here, a comprehensive numerical study was conducted on a modeling method for the first time to simulate the axial behavior of a slender circular CFDAT. This study outlines the development of numerical modeling techniques and presents a series of comparative studies using various material nonlinearities, confinement effects, and nonlinearity of the initial geometric imperfections for a slender column. The numerical results were compared with more than 80 previously available stub and slender experimental test results for verification. It was confirmed that the proposed numerical technique was reliable and accurate for simulating the axial behavior of intermediate and slender circular CFDAT. Furthermore, a parametric study was conducted to investigate the effects of geometric and material properties on the axial capacity of the CFDAT. Additionally, the slenderness and strength-to-width ratio of CFDAT were compared with those of concrete-filled double-skin steel tubular columns (CFDST). The simulated axial strengths were compared with those predicted using AS 5100 and AISC 360. New design equations for the CFDATs should be proposed based on AS 5100.

Keywords： axial behavior     aluminum     concrete-filled     double-skin     slender columns     numerical modelling    

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Metal-organic framework loaded manganese oxides as efficient catalysts for low-temperature selective

Minhua Zhang, Baojuan Huang, Haoxi Jiang, Yifei Chen

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 4,   Pages 594-602 doi: 10.1007/s11705-017-1668-5

Abstract: A mild deposition method was used to fabricate Mn-based catalysts on a UiO-66 carrier for the selective catalytic reduction of NO by NH (NH -SCR). The catalyst with 8.5 wt-% MnO loading had the highest catalytic activity for NH -SCR with a wide temperature window (100–290 °C) for 90% NO conversion. Characterization of the prepared MnO /UiO-66 catalysts showed that the catalysts had the crystal structure and porosity of the UiO-66 carrier and that the manganese particles were well-distributed on the surface of the catalyst. X-ray photoelectron spectroscopy analysis showed that there are strong interactions between the MnO and the Zr oxide secondary building units of the UiO-66 which has a positive effect on the catalytic activity. The 8.5 wt-% MnO catalyst maintained excellent activity during a 24-h stability test and exhibited good resistance to SO poisoning.

Keywords： metal-organic framework     selective catalytic reduction     manganese oxides     deNOx     SO2 resistance    

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Preparation of a Pb loaded gas diffusion electrode and its application to CO

Ang LI, Hua WANG, Jinyu HAN, Li LIU

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 4,   Pages 381-388 doi: 10.1007/s11705-012-1216-2

Abstract: A Pb loaded gas diffusion electrode was fabricated and used for the electroreduction of CO to formic

Keywords： electroreduction     carbon dioxide     lead catalyst     gas diffusion electrode     formic acid    

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Selective targeted adsorption and inactivation of antibiotic-resistant bacteria by Cr-loaded mixed metal

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 6, doi: 10.1007/s11783-021-1502-7

Abstract:

• LDHs and MMOs was synthesized by ultrasound-assisted one-step co-precipitation.

Keywords： Heavy metal adsorption     Magnetic hydrotalcite     ARBs removal     Cr(VI)-MMOs combined antibacterial activity    

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Long acting carmustine loaded natural extracellular matrix hydrogel for inhibition of glioblastoma recurrence

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 4,   Pages 536-545 doi: 10.1007/s11705-021-2067-5

Abstract: the ratio of lactic acid groups to glycolic acid groups is 75/25) nanoparticles were simultaneously loaded

Keywords： BCNU     glioblastoma recurrence     tumor resection     nanoparticles     hydrogel    

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Cooling performance of grid-sheets for highly loaded ultra-supercritical steam turbines

Dieter BOHN , Robert KREWINKEL , Shuqing TIAN ,

Frontiers in Energy 2009, Volume 3, Issue 3,   Pages 313-320 doi: 10.1007/s11708-009-0036-7

Abstract: Collaborative research centre 561 “Thermally Highly Loaded, Porous and Cooled Multi-Layer Systemsfor Combined Cycle Power Plants” at RWTH Aachen University proposes cooling the highly loadedTo protect the thermally highly loaded components, a sandwich material consisting of two thin face sheets

Keywords： steam turbines     700&     deg     C-technology     numerical inverstigation     cooling    

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Application of high-turning bowed compressor stator to redesign of highly loaded fan stage

LI Shaobin, SU Jiexian, WANG Zhongqi

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 534-540 doi: 10.1007/s11708-008-0066-6

Abstract: A redesign of a highly loaded fan stage by using high-turning bowed compressor stator was conducted.The original tandem stator was replaced by the highly loaded bowed stator which was applicable to highlyThe results show that the highly loaded bowed stator can be used not only to improve the structure andIt is believed that the highly loaded bowed stator can advance the design of high-performance compressor

Keywords： off-design     different     numerical     contouring technique     high-performance compressor    

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A simplified method for the determination of vertically loaded pile-soil interface parameters in layered

Jiu-jiang WU,Yan LI,Qian-gong CHENG,Hua WEN,Xin LIANG

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 1,   Pages 103-111 doi: 10.1007/s11709-015-0328-4

Abstract: The numerical analysis of pile-soil interaction commonly requires a lot of trial works to determine the interface parameters and the accuracy cannot be ensured normally. Considering this, this paper first conducts a sensitivity analysis to figure out the influence of interface parameters on the bearing behavior of a single pile in sand. Then, a simplified method for the determination of pile-soil interface parameters in layered soil is proposed based on the parameter studies. Finally, a filed loading test is used for the validation of the simplified method, and the calculated results agree well with the monitoring data. In general, the simplified method proposed in this paper works with higher accuracy and consumes less time compared with the traditional trial works, especially on the determinations of interfacial cohesive and interfacial friction angle.

Keywords： determination of interface parameters     pile-soil interaction     FLAC3D     sensitivity analysis     layered soil    

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Preparation of biomass-derived carbon loaded with MnO2 as lithium-ion battery anode for improving

Likai Zhu;Huaping Lin;Wenli Zhang;Qinhui Wang;Yefeng Zhou

Frontiers of Chemical Science and Engineering 2024, Volume 18, Issue 1,   Pages 10-10 doi: 10.1007/s11705-023-2376-y

Abstract: Biomass-derived carbon materials for lithium-ion batteries emerge as one of the most promising anodes from sustainable perspective. However, improving the reversible capacity and cycling performance remains a long-standing challenge. By combining the benefits of K2CO3 activation and KMnO4 hydrothermal treatment, this work proposes a two-step activation method to load MnO2 charge transfer onto biomass-derived carbon (KAC@MnO2). Comprehensive analysis reveals that KAC@MnO2 has a micro-mesoporous coexistence structure and uniform surface distribution of MnO2, thus providing an improved electrochemical performance. Specifically, KAC@MnO2 exhibits an initial charge-discharge capacity of 847.3/1813.2 mAh·g–1 at 0.2 A·g–1, which is significantly higher than that of direct pyrolysis carbon and K2CO3 activated carbon, respectively. Furthermore, the KAC@MnO2 maintains a reversible capacity of 652.6 mAh·g–1 after 100 cycles. Even at a high current density of 1.0 A·g–1, KAC@MnO2 still exhibits excellent long-term cycling stability and maintains a stable reversible capacity of 306.7 mAh·g–1 after 500 cycles. Compared with reported biochar anode materials, the KAC@MnO2 prepared in this work shows superior reversible capacity and cycling performance. Additionally, the Li+ insertion and de-insertion mechanisms are verified by ex situ X-ray diffraction analysis during the charge-discharge process, helping us better understand the energy storage mechanism of KAC@MnO2.

Keywords： biomass-derived carbon     MnO2     lithium-ion batteries     anode material     high reversible capacity    

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em>Escherichia coli and bacteriophage MS2 in water using a copper and silver loaded

Guiying RAO, Kristen S. BRASTAD, Qianyi ZHANG, Rebecca ROBINSON, Zhen HE, Ying LI

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 4, doi: 10.1007/s11783-016-0854-x

Abstract: In this study, a new material with a novel structure, silver and copper loaded TiO nanowire membrane

Keywords： Photo-activated disinfection     Titanium dioxide     Nanowire membrane     Silver     Copper    

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A MEMS Micro Force Sensor Based on a Laterally Movable Gate Field-Effect Transistor (LMGFET) with a Novel Article

Wendi Gao, Zhixia Qiao, Xiangguang Han, Xiaozhang Wang, Adnan Shakoor, Cunlang Liu, Dejiang Lu, Ping Yang, Libo Zhao, Yonglu Wang, Jiuhong Wang, Zhuangde Jiang, Dong Sun

Engineering 2023, Volume 21, Issue 2,   Pages 61-74 doi: 10.1016/j.eng.2022.06.018

Abstract:

This paper presents the development of a novel micro force sensor based on a laterally movable gate

Keywords： Force sensor     Laterally movable gate     Field-effect transistor     Photoresistive SU-8     Biomedical micromanipulation    

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Sagittal SLIP-anchored task space control for a monopode robot traversing irregular terrain

Haitao YU, Haibo GAO, Liang DING, Zongquan DENG

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 2,   Pages 193-208 doi: 10.1007/s11465-019-0569-3

Abstract: that captures the essential dynamical behaviors of legged locomotion on sagittal plane, the spring-loaded

Keywords： legged robots     spring-loaded inverted pendulum     task space control     apex return map     deadbeat control     irregular    

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Title Author Date Type Operation

Numerical investigation of the ultimate lateral resistance of piles in soft clay

Konstantinos P. TZIVAKOS,Michael J. KAVVADAS

Journal Article

PM-support interfacial effect and oxygen mobility in Pt, Pd or Rh-loaded (Ce,Zr,La)O catalysts

Journal Article

The cavitation erosion damage process of dynamically loaded journal bearings

MA Yan-yan, CHENG Xian-hua

Journal Article

Numerical study of axial-loaded circular concrete-filled aluminum tubular slender columns

Journal Article

Metal-organic framework loaded manganese oxides as efficient catalysts for low-temperature selective

Minhua Zhang, Baojuan Huang, Haoxi Jiang, Yifei Chen

Journal Article

Preparation of a Pb loaded gas diffusion electrode and its application to CO

Ang LI, Hua WANG, Jinyu HAN, Li LIU

Journal Article

Selective targeted adsorption and inactivation of antibiotic-resistant bacteria by Cr-loaded mixed metal

Journal Article

Long acting carmustine loaded natural extracellular matrix hydrogel for inhibition of glioblastoma recurrence

Journal Article

Cooling performance of grid-sheets for highly loaded ultra-supercritical steam turbines

Dieter BOHN , Robert KREWINKEL , Shuqing TIAN ,

Journal Article

Application of high-turning bowed compressor stator to redesign of highly loaded fan stage

LI Shaobin, SU Jiexian, WANG Zhongqi

Journal Article

A simplified method for the determination of vertically loaded pile-soil interface parameters in layered

Jiu-jiang WU,Yan LI,Qian-gong CHENG,Hua WEN,Xin LIANG

Journal Article

Preparation of biomass-derived carbon loaded with MnO2 as lithium-ion battery anode for improving

Likai Zhu;Huaping Lin;Wenli Zhang;Qinhui Wang;Yefeng Zhou

Journal Article

em>Escherichia coli and bacteriophage MS2 in water using a copper and silver loaded

Guiying RAO, Kristen S. BRASTAD, Qianyi ZHANG, Rebecca ROBINSON, Zhen HE, Ying LI

Journal Article

A MEMS Micro Force Sensor Based on a Laterally Movable Gate Field-Effect Transistor (LMGFET) with a Novel

Wendi Gao, Zhixia Qiao, Xiangguang Han, Xiaozhang Wang, Adnan Shakoor, Cunlang Liu, Dejiang Lu, Ping Yang, Libo Zhao, Yonglu Wang, Jiuhong Wang, Zhuangde Jiang, Dong Sun

Journal Article

Sagittal SLIP-anchored task space control for a monopode robot traversing irregular terrain

Haitao YU, Haibo GAO, Liang DING, Zongquan DENG

Journal Article