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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.The results indicate that increasing rise-span ratio, height-span ratio and cable-stayed segment lengthor reducing the second dead load could increase the cooperation system span.

Keywords： cable-stayed suspension     self-anchored     limit span    

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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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Control mode selection for modal control of long-span arch bridge

Zhengying LI, Zhengliang LI,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 4,   Pages 401-406 doi: 10.1007/s11709-009-0052-z

Abstract: For seismic control of arch bridge, a model reduction of long-span arch bridge was implemented basedThe numerical results show that the method of maximal modal displacement better analyze long-span arch

Keywords： selection     reduced-order     excitation     long-span     simplified    

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State-of-the-art of long-span bridge engineering in China

XIANG Haifan, GE Yaojun

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 4,   Pages 379-388 doi: 10.1007/s11709-007-0051-x

Abstract: introduces the state-of-the-art of longspan bridge engineering in China with emphases on recent long-spanbridge projects, bridge deck configuration and material, design codes of long-span bridges and improvement

Keywords： bridge engineering     state-of-the-art     long-span bridge     configuration     improvement    

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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 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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Research on bolt-cable reducing span support technology in large span roadway of fully-mechanized coal

Zhu Yongjian,Luo Yixin,Zhang Daobing

Strategic Study of CAE 2010, Volume 12, Issue 3,   Pages 51-55

Abstract:

Aiming at the locale facts of difficult roof controlling for large spanA new supporting idea of reducing span supporting function by bolts cooperating with anchor cables isA good result is achieved after the new supporting idea is applied in the large span gateway of Bulianta

Keywords： large span     roadway     roof     bolt—cable     reducing span support    

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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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Design and construction of super-long span bridges in China: Review and future perspectives

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 803-838 doi: 10.1007/s11709-020-0644-1

Abstract: Super-long span bridges demand high design requirements and involve many difficulties when constructedOver the past three decades, a large percentage of the new long-span bridges around the world were builtconstruction practices of the superstructure, the substructure, and the steel deck paving of the long-spanbridges during the past decades as well as the current operation status of the existing long-span bridgestechnology, which is expected to guide the development direction for the construction of future super long-span

Keywords： long-span bridges     steel box girder     design technology     construction technology     review and future perspectives    

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Innovative steel-UHPC composite bridge girders for long-span bridges

Xudong SHAO, Lu DENG, Junhui CAO

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 4,   Pages 981-989 doi: 10.1007/s11709-019-0531-9

Abstract: Steel and steel-concrete composite girders are two types of girders commonly used for long-span bridgesThus, to improve the serviceability and durability of girders for long-span bridges, three new typescoefficient, low risk of cracking, and excellent durability, making them competitive alternatives for long-spanIt is expected that the application of the new steel-UHPC composite girders on long-span bridges will

Keywords： steel-UHPC composite bridge girder     long-span bridge     orthotropic steel deck     fatigue cracking     durability    

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Unified solution of limit loads of thick wall cylinder subject to external pressure considering strain

CHEN Changfu, XIAO Shujun, YANG Yu

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 329-333 doi: 10.1007/s11709-007-0043-x

Abstract: for strain softening materials, such as concrete or rock, was derived, and the elastic and plastic limitIn addition, the influence of some factors on the limit loads of such cylinders as the ratio of the external
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Title Author Date Type Operation

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

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

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

Control mode selection for modal control of long-span arch bridge

Zhengying LI, Zhengliang LI,

Journal Article

State-of-the-art of long-span bridge engineering in China

XIANG Haifan, GE Yaojun

Journal Article

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

Bo GU,Xudong QIAN,Aziz AHMED

Journal Article

Stability analysis of layered slopes in unsaturated soils

Guangyu DAI; Fei ZHANG; Yuke WANG

Journal Article

Research on bolt-cable reducing span support technology in large span roadway of fully-mechanized coal

Zhu Yongjian,Luo Yixin,Zhang Daobing

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

Design and construction of super-long span bridges in China: Review and future perspectives

Journal Article

Innovative steel-UHPC composite bridge girders for long-span bridges

Xudong SHAO, Lu DENG, Junhui CAO

Journal Article

Unified solution of limit loads of thick wall cylinder subject to external pressure considering strain

CHEN Changfu, XIAO Shujun, YANG Yu

Journal Article