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3D fracture modelling and limit state analysis of prestressed composite concrete pipes

Pengfei HE, Yang SHEN, Yun GU, Pangyong SHEN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1,   Pages 165-175 doi: 10.1007/s11709-018-0484-4

Abstract: In this manuscript, we study fracture of prestressed cylindrical concrete pipes. Such concrete pipes play a major role in tunneling and underground engineering. The structure is modelled fully in 3D using three-dimensional continuum elements for the concrete structure which beam elements are employed to model the reinforcement. This allows the method to capture important phenomena compared to a pure shell model of concrete. A continuous approach to fracture is chosen when concrete is subjected to compressive loading while a combined continuous-discrete fracture method is employed in tension. The model is validated through comparisons with experimental data.

Keywords： cylindrical concrete structures     limit state analysis     3D fracture modelling     prestressed composite pipes    

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Foundations bearing capacity subjected to seepage by the kinematic approach of the limit analysis

Mehdi VEISKARAMI, Ghasem HABIBAGAHI

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4,   Pages 446-455 doi: 10.1007/s11709-013-0227-5

Abstract: The kinematic approach of the limit analysis was employed to find the upper-bound limit of the bearing

Keywords： foundation     bearing capacity     limit analysis     numerical computation     plasticity     seepage    

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Stability analysis of layered slopes in unsaturated soils

Guangyu DAI; Fei ZHANG; Yuke WANG

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 3,   Pages 378-387 doi: 10.1007/s11709-022-0808-2

Abstract: This study presents stability analyses of layered soil slopes in unsaturated conditions and uses a limit

Keywords： slope stability     suction stress     unsaturated soil     layered slope     limit equilibrium    

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Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 478-490 doi: 10.1007/s11709-015-0317-7

Abstract: This paper presents a simple and efficient approach for predicting the plastic limit loads in crackedWe use two levels of mesh repartitioning for the finite element limit analysis.The limit analysis problem is recast into the compact form of a second-order cone programming (SOCP)

Keywords： cracked structure     limit analysis     von Mises criterion     edge-based strain smoothing     second-order cone programming    

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capacities of under-reamed piles in soft clay underlaid by stiff clay using lower-bound finite element limitanalysis

Mantu MAJUMDER, Debarghya CHAKRABORTY

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 537-551 doi: 10.1007/s11709-021-0708-x

Abstract: piles in soft clay underlaid by stiff clay is numerically studied using the lower-bound finite element limitanalysis (LB FELA).radial stress along the pile–soil interface, distribution of axial force in the under-reamed piles, and state

Keywords： bearing capacity     uplift capacity     under-reamed pile     clay     limit analysis    

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Axial compression behavior of CFRP-confined rectangular concrete-filled stainless steel tube stub column

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1144-1159 doi: 10.1007/s11709-021-0762-4

Abstract: bearing capacity prediction method was proposed based on the twin-shear strength theory, combining the limitequilibrium state of the CFRP-confined CFSST stub column under axial compression.

Keywords： CFRP     rectangular CFSST stub column     bearing capacity     limit equilibrium state     twin-shear strength theory    

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Steady-state thermal-hydraulic analysis of SCWR assembly

LIU Xiaojing, CHENG Xu

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 475-478 doi: 10.1007/s11708-008-0093-3

Abstract: A thermal-hydraulic analysis of the SCWR assembly is performed in this paper using the modified COBRA-IV

Keywords： cladding temperature     assembly     temperature     coolant     resistance    

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Effectiveness of state incentives for promoting wind energy: A panel data examination

Deepak SANGROYA,Jogendra NAYAK

Frontiers in Energy 2015, Volume 9, Issue 3,   Pages 247-258 doi: 10.1007/s11708-015-0364-8

Abstract: The Indian government, as well as different state governments, are adopting policy instruments such asThis paper evaluates the effectiveness of state level incentives for the development of wind energy inFixed effect panel data modelling technique of econometric analysis is used to analyse the data of 26

Keywords： India     wind energy development     state incentives     econometric analysis     panel data    

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Modeling and analysis of steady-state vibration induced by backlash in servo rotary table

Xiao YANG,Dun LU,Sanli LIU,Jun ZHANG,Wanhua ZHAO

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 1,   Pages 43-47 doi: 10.1007/s11465-015-0327-0

Abstract: Steady-state vibration may be induced by backlash in closed loop feed drive systems.as position controller gain, velocity controller gain, load and the magnitude of backlash, on steady-stateThe steady-state vibration amplitude increases with the position controller gain, load and the magnitudeThe steady-state vibration frequency increases with the position controller gain and the velocity controller

Keywords： backlash     servo rotary table     steady-state vibration    

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Modeling limit force capacities of high force to volume lead extrusion dampers

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 609-622 doi: 10.1007/s11709-021-0724-x

Abstract: Lead extrusion dampers are supplemental energy-dissipation devices that are used to mitigate seismic structural damage. Small volumetric sizes and high force capacities define high-force-to-volume (HF2V) devices, which can absorb significant response energy without sacrificial damage. However, the design of such devices for specific force capacities has proven difficult based on the complexities of their internal reaction mechanisms, leading to the adoption of empirical approaches. This study developed upper- and lower-bound force capacity estimates from analytical mechanics based on direct and indirect metal extrusion for guiding design. The derived equations are strictly functions of HF2V device geometric parameters, lead material properties, and extrusion mechanics. The upper-bound estimates from direct and indirect extrusion are denoted as (FUB,1, FUB,2) and (FUB,3, FUB,4), respectively, and the lower-bound estimates are denoted as (FLB, FLB,1) based on the combination of extrusion and friction forces. The proposed models were validated by comparing the predicted bounds to experimental force capacity data from 15 experimental HF2V device tests. The experimental device forces all lie above the lower-bound estimates (FLB, FLB,1) and below the upper-bound estimates (FUB,1, FUB,2, FUB,4). Overall, the (FLB, FUB,2) pair provides wider bounds and the (FLB,1, FUB,4/FUB,1) pair provides narrower bounds. The (FLB,1, FUB,1) pair has a mean lower-bound gap of 36%, meaning the lower bound was 74% of the actual device force on average. The mean upper-bound gap was 33%. The bulge area and cylinder diameter of HF2V devices are key parameters affecting device forces. These relatively tight bounds provide useful mechanics-based predictive design guides for ensuring that device forces are within the targeted design range after manufacturing.

Keywords： extrusion     lead dampers     upper and lower bound     analytical modelling     limit force    

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Setting up a heart rate alarm limit to decrease oculocardiac reflex during strabismus surgery in children

ZHANG Kangkang, GU Enhua, LU Junjie

Frontiers of Medicine 2008, Volume 2, Issue 3,   Pages 295-297 doi: 10.1007/s11684-008-0056-4

Abstract: The aim of this paper is to investigate a method which may decrease the incidence and severity of oculocardiac reflex (OCR) without drugs. One hundred and sixty children undergoing strabismus surgery were allocated to two groups using double-blind randomization. OCR was defined as a decrease of more than 10% from the baseline heart rate during operation. An alarm sounded and a lamp flashed as soon as OCR occurred in group I, and neither of the above happened in group II. OCR occurred (1.151 ± 0.858) times in group I and (2.287 ± 1.371) times in group II ( < 0.05). Heart rate decreased by (23 ± 19) bpm in group I and (35 ± 28) bpm in group II ( < 0.05). The duration of OCR in group I and group II was (4.36 ± 4.26)s and (7.62 ± 6.41)s, respectively ( < 0.05). The recovery time for group I and group II was (15.36 ± 13.28)s and (32.36 ± 19.57)s, respectively ( < 0.05). The numbers of times of interruption were 8 in group I (10%) and 26 in group II (32%) ( < 0.01). This method significantly decreased the incidence and severity of OCR during strabismus surgery in children.
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New model of load transfer function for pile analysis based on disturbed state model

LIU Qijian, YANG Linde, WU Jun

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 4,   Pages 443-447 doi: 10.1007/s11709-007-0060-9

Abstract: Based on the disturbed state concept (DSC), a new model of load transfer function for pile analysis ispile and soil can be treated as a mixture of two constituent parts, which are in intact or critical stateIn the model, shear intensity of elements in an intact state are simulated by Duncan-Zhang model andthat in a critical state by Mohr-Coulomb criterion.

Keywords： hardening     homogenization     displacement     engineering     Duncan-Zhang    

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Development of Finite Element Limit Analysis Method and Its Applications in Geotechnical Engineering

Zheng Yingren,Zhao Shangyi,Deng Chujian,Liu Weiming,Tang Xiaosong,Zhang Liming

Strategic Study of CAE 2006, Volume 8, Issue 12,   Pages 39-61

Abstract:

Finite element limit analysis method has the advantage of combining numerical analysis method withtraditional limit equilibrium methods.It is particularly applicable to the analysis and design of geotechnical engineering.In the early 20th century, finite element limit analysis method has been developed vigorously in domestic

Keywords： limit analysis method     finite element method     geotechnical engineering     slope     foundations     tunnel    

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Undrained seismic bearing capacity of strip footing adjacent to a heterogeneous excavation

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 566-583 doi: 10.1007/s11709-023-0905-x

Abstract: The analysis of the bearing capacity of strip footings sited near an excavation is critical in geotechnicsfooting resting on an excavation were evaluated using the lower and upper bounds of the finite element limitanalysis method.

Keywords： excavation     finite element limit analysis     heterogeneous soil     strip footing     undrained bearing capacity    

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Modeling considerations in seismic assessment of RC bridges using state-of-practice structural analysis

Ricardo MONTEIRO, Miguel ARAÚJO, Raimundo DELGADO, Mário MARQUES

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 1,   Pages 109-124 doi: 10.1007/s11709-017-0389-7

Abstract: restrictive performance requirements hence, many times, to the need of using new and more accurate methods of analysispreferred choice of the majority of design codes, as an alternative to complete nonlinear time-history analysiscontribute to this need by providing further insight with respect to the use of commonly employed structural analysissoftware tools in nonlinear analysis of bridge structures.The adopted structural analysis program proved to be accurate, yielding reliable estimates, both in terms

Keywords： nonlinear analysis     pushover     RC bridges     structural modelling software    

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Title Author Date Type Operation

3D fracture modelling and limit state analysis of prestressed composite concrete pipes

Pengfei HE, Yang SHEN, Yun GU, Pangyong SHEN

Journal Article

Foundations bearing capacity subjected to seepage by the kinematic approach of the limit analysis

Mehdi VEISKARAMI, Ghasem HABIBAGAHI

Journal Article

Stability analysis of layered slopes in unsaturated soils

Guangyu DAI; Fei ZHANG; Yuke WANG

Journal Article

Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

Journal Article

capacities of under-reamed piles in soft clay underlaid by stiff clay using lower-bound finite element limitanalysis

Mantu MAJUMDER, Debarghya CHAKRABORTY

Journal Article

Axial compression behavior of CFRP-confined rectangular concrete-filled stainless steel tube stub column

Journal Article

Steady-state thermal-hydraulic analysis of SCWR assembly

LIU Xiaojing, CHENG Xu

Journal Article

Effectiveness of state incentives for promoting wind energy: A panel data examination

Deepak SANGROYA,Jogendra NAYAK

Journal Article

Modeling and analysis of steady-state vibration induced by backlash in servo rotary table

Xiao YANG,Dun LU,Sanli LIU,Jun ZHANG,Wanhua ZHAO

Journal Article

Modeling limit force capacities of high force to volume lead extrusion dampers

Journal Article

Setting up a heart rate alarm limit to decrease oculocardiac reflex during strabismus surgery in children

ZHANG Kangkang, GU Enhua, LU Junjie

Journal Article

New model of load transfer function for pile analysis based on disturbed state model

LIU Qijian, YANG Linde, WU Jun

Journal Article

Development of Finite Element Limit Analysis Method and Its Applications in Geotechnical Engineering

Zheng Yingren,Zhao Shangyi,Deng Chujian,Liu Weiming,Tang Xiaosong,Zhang Liming

Journal Article

Undrained seismic bearing capacity of strip footing adjacent to a heterogeneous excavation

Journal Article

Modeling considerations in seismic assessment of RC bridges using state-of-practice structural analysis

Ricardo MONTEIRO, Miguel ARAÚJO, Raimundo DELGADO, Mário MARQUES

Journal Article