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A toughness based deformation limit for X- and K-joints under brace axial tension

Bo GU,Xudong QIAN,Aziz AHMED

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 3,   Pages 345-362 doi: 10.1007/s11709-016-0333-2

Abstract: This study reports a deformation limit for the initiation of ductile fracture failure in fatigue-crackedThe proposed approach sets the deformation limit as the numerically computed crack driving force in aThe development of the deformation limit includes a normalization procedure, which covers a wide rangedemonstrates the conservative nature of the proposed deformation limit.The proposed deformation limit, when extrapolated to a zero crack depth, provides an estimate on the

Keywords： circular hollow section (CHS)     tubular joint     fracture failure     deformation limit     J-integral    

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Stability and deformation analysis of high slope for tank type of bunker at Donglutian coal mine

Jiang Haibo,Gong Shoucai,Liu Qingxue

Strategic Study of CAE 2012, Volume 14, Issue 2,   Pages 107-112

Abstract: In this paper, the stability calculation and deformation analysis of excavation slope under differentconditions are made, using the limit equilibrium method and the finite element method.The stability and deformation are satisfied with operational requirement, and the layout of reinforcement

Keywords： tank type of bunker     slope     limit equilibrium method     finite element method (FEM)     stability     deformation    

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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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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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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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Resistance of large deformation of the Wushaoling Tunnel F7 soft fault

ZHAO Xufeng, CHEN Haiming, WANG Chunmiao

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 1,   Pages 123-127 doi: 10.1007/s11709-007-0013-3

Abstract: The measurements and techniques are proposed to resist the deformation.

Keywords： F7     deformation     appropriate     construction     mechanical    

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Numerical modeling of nonlinear deformation of polymer composites based on hyperelastic constitutive

Qingsheng YANG, Fang XU

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 284-288 doi: 10.1007/s11465-009-0067-0

Abstract: reinforced polymer (FRP) composites exhibit nonlinear and hyperelastic characteristics under finite deformationhyperelastic behavior of fiber reinforced polymer composites using a micromechanical model and finite deformationThe local stress and deformation of a representative volume element are calculated by the nonlinear finiteNumerical examples are given to demonstrate hyperelastic behavior and deformation of the composites,

Keywords： composites     hyperelastic     finite deformation     homogenization     micromechanics    

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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 limit

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 limit

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

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Limit span of self-anchored cable-stayed suspension cooperation system bridge based on strength

Zhe ZHANG , Huili WANG , Xiaomeng GE , Sifeng QIN ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 286-291 doi: 10.1007/s11709-009-0045-y

Abstract: The limit span of self-anchored cable-stayed suspension bridge is deduced.Based on the material strength and commonly used materials, the limit spans of self-anchored cable-stayedThe corresponding upper limit spans and the effect of the factors on the span are given.

Keywords： cable-stayed suspension     self-anchored     limit span    

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A continuous/discontinuous deformation analysis (CDDA) method based on deformable blocks for fracture

Yongchang CAI, Hehua ZHU, Xiaoying ZHUANG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4,   Pages 369-378 doi: 10.1007/s11709-013-0222-x

Abstract: In the framework of finite element meshes, a novel continuous/discontinuous deformation analysis (CDDACDDA is particularly suitable for modeling the fracture propagation because the switch from continuous deformationanalysis to discontinuous deformation analysis is natural and convenient without additional procedures

Keywords： fracture     crack     propagation     deformable block     continuous/discontinuous deformation analysis (CDDA)    

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Calculation methods of the crack width and deformation for concrete beams with high-strength steel bars

Jianmin ZHOU, Shuo CHEN, Yang CHEN

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3,   Pages 316-324 doi: 10.1007/s11709-013-0211-0

Abstract: groups of concrete beams reinforced with high-strength steel bars were tested, and the crack width and deformation

Keywords： concrete beam     high-strength steel bar     crack width     deformation    

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Calculation method of radial stress and deformation on conic threaded connections with interference fit

Shoujun CHEN, Qiang LI, Qi AN,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 3,   Pages 302-307 doi: 10.1007/s11465-010-0018-9

Abstract: This paper presents a calculation method for radial stress distribution and deformation on conic threadedThe model offers a new way of calculating the radial stress and deformation on conic thread connections

Keywords： conic threaded connections     interference fit     radial stress     deformation     finite element analysis (FEA)    

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Title Author Date Type Operation

A toughness based deformation limit for X- and K-joints under brace axial tension

Bo GU,Xudong QIAN,Aziz AHMED

Journal Article

Stability and deformation analysis of high slope for tank type of bunker at Donglutian coal mine

Jiang Haibo,Gong Shoucai,Liu Qingxue

Journal Article

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

Mehdi VEISKARAMI, Ghasem HABIBAGAHI

Journal Article

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

Pengfei HE, Yang SHEN, Yun GU, Pangyong SHEN

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

Resistance of large deformation of the Wushaoling Tunnel F7 soft fault

ZHAO Xufeng, CHEN Haiming, WANG Chunmiao

Journal Article

Numerical modeling of nonlinear deformation of polymer composites based on hyperelastic constitutive

Qingsheng YANG, Fang XU

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 limit

Mantu MAJUMDER, Debarghya CHAKRABORTY

Journal Article

Limit span of self-anchored cable-stayed suspension cooperation system bridge based on strength

Zhe ZHANG , Huili WANG , Xiaomeng GE , Sifeng QIN ,

Journal Article

A continuous/discontinuous deformation analysis (CDDA) method based on deformable blocks for fracture

Yongchang CAI, Hehua ZHU, Xiaoying ZHUANG

Journal Article

Calculation methods of the crack width and deformation for concrete beams with high-strength steel bars

Jianmin ZHOU, Shuo CHEN, Yang CHEN

Journal Article

Calculation method of radial stress and deformation on conic threaded connections with interference fit

Shoujun CHEN, Qiang LI, Qi AN,

Journal Article