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ultimate strength of Annular Reinforced Concrete Members Under Combined Actions

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Journal of Shanghai Jiaotong university(Science) 2019年第4期24卷 430-438页

作者： WANG Pu ZHOU Dai HUANG Zhen School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Annular reinforced concrete(RC) members are commonly used in bridge structures and offshore platforms. These RC members often fail under the combined actions of axial force, bending moment, shear force and torsion load in hazards of earthquake and wind. It is very important to study the failure mechanism of annular RC members under combined actions. This study proposes a model to analyze the ultimate strength of annular RC members under combined actions using limit failure theory. A new method is established to determine the geometric parameters of the warped failure surface, and the new calculation model for the ultimate strength is obtained using the equilibrium conditions based on the geometric parameters and the stress distribution on the failure surface. The proposed model calculations are compared with a series of experimental results of annular RC members, and they correspond well with the experimental results. The proposed model is feasible for engineering application.

关键词： combined loads limit failure theory annular reinforced concrete (RC) members ultimate strength

Approach for analyzing the ultimate strength of concrete filled steel tubular arch bridges with stiffening girder

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 682-692页

作者： ZHANG Zhi-cheng XIE Xu ZHANG He CHEN Heng-zhi Department of Civil Engineering Zhejiang University Hangzhou 310027 China

A convenient approach is proposed for analyzing the ultimate load carrying capacity of concrete filled steel tubular (CFST) arch bridge with stiffening girders. A fiber model beam element is specially used to simulate the stiffening girder and CFST arch rib. The geometric nonlinearity, material nonlinearity, influence of the construction process and the contribution of prestressing reinforcement are all taken into consideration. The accuracy of this method is validated by comparing its results with experimental results. Finally, the ultimate strength of an abnormal CFST arch bridge with stiffening girders is investigated and the effect of construction method is discussed. It is concluded that the construction process has little effect on the ultimate strength of the bridge.

关键词： ultimate strength Concrete filled steel tubular (CFST) arch bridge Stiffening girder Fiber model beam element Construction process

A Simple Empirical Formula for Predicting the ultimate strength of Ship Plates with Elastically Restrained Edges in Axial Compression

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China Ocean Engineering 2020年第4期34卷 571-580页

作者： LIU Cong ZHANG Shi-lian State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China

An investigation is conducted on the static ultimate limit state assessment of ship hull plates with elastically restrained edges subjected to axial *** material and geometric non-linearities were considered in finite element(FE)*** initial geometric imperfection of the plate was considered,while the residual stress introduced by welding was not *** ultimate strength of simply supported ship hull plates compared well with the existing empirical formula to validate the correctness of the applied boundary conditions,initial imperfection and mesh *** extensive FE calculations on the ultimate strength of ship hull plates with elastically restrained edges are *** a new simple empirical formula for plate ultimate strength is developed,which includes the effect of the rotational restraint stiffness,rotational restraint stiffness,and aspect *** applying the new formula and FE method to ship hull plates in real ships,a good coincidence of the results between these two methods is obtained,which indicates that the new formula can accurately predict the ultimate strength of ship hull plates with elastically restrained edges.

关键词： ship hull plate ultimate strength axial compression elastically restrained edges empirical formula

A Computational Investigation of the Group Effect of Pits on the ultimate strength of Steel Plates

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China Ocean Engineering 2018年第6期32卷 665-674页

作者： FU Qiang FANG Hui WU Ren-xia YU Xue-hui LI Hua-jun Institute of Coastal and Offshore Engineering School of Engineering Ocean University of China State Key Laboratory for strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi'an Jiaotong University

In this work, we focus on assessing the group effect of localized corrosion on the ultimate strength of the marine structural plates and study the load-deformation behaviors of plates of various slenderness and uniaxial ***, we investigate different corroded patterns from a single circular pit to 25 circular pits distributed over the plate and carry out hundreds of nonlinear finite element simulations by combining the number, depth, distribution of pits with imperfections and slenderness of plate. The distribution of multiple pits causes scattering of stress concentration on the plate, then the plastic section of plate changes with wider distribution of damage simultaneously. The ultimate strength arises when un-loading zone comprised of the yielding strips and holes extends across the plate. It can be concluded that the corroded condition defined as group effect of pits manipulates the deformation state and the loading capacity of plate at the ultimate strength mode that coincides with the proportion of effective loading area and section in the process of post-buckling. To validate the effect of pits group, we perform the numerical experiments of the post-buckling of steel plates containing pits in a row with different orientation.

关键词： group effect localized corrosion post-buckling ultimate strength

Reliability of the ultimate strength of Ship Stiffened Panel Subjected to Random Corrosion Degradation

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China Ocean Engineering 2017年第1期31卷 11-18页

作者： FENG Guo-qing HU Bing-nan REN Hui-long College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China

Attentions have been increasingly paid to the influence of the corrosion on the ultimate strength of ship structures. In consideration of the random characteristics of the corrosion of ship structures, the method for the ultimate strength analysis of the ship stiffened panel structure subjected to random corrosion degradation is presented. According to the measured corrosion data of the bulk carriers, the distribution characteristics of the corrosion data for the stiffened panel on the midship deck are analyzed, and a random corrosion model is established. The ultimate strength of the corroded stiffened panel is calculated by lhe nonlinear finite element analysis. The statistical descriptions of the ultimate strength of the corroded stiffened panel are defined through the Monte Carlo simulations. A formula is proposed on the ultimate strength reduction of the stiffened panel as a function of the corrosion volume. The reliability analysis of the ultimate strength of the corroded deck stiffened panel is performed. It shows that both the corrosion data of the deck stiffened panel and the ultimate strength of the random corroded deck stiffened panel follow the log-normal distribution. The ultimate stress ratio of the stiffened panel is inversely proportional to the corrosion volume ratio.

关键词： stiffened panel corrosion ultimate strength time variant reliability corrosion volume /:~no- ~T (~ ~11 R NI R^n l-I I. 9017 Rollnhilltvnftho.ltlmnto ~trontrth nf^hl

Restoration of ultimate strength of Dented Hemispheres Under External Hydrostatic Pressure

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China Ocean Engineering 2022年第3期36卷 500-507页

作者： HUANG Chen ZHANG Jian WANG Fang DI Chen-yang School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Shanghai Engineering Research Center of Hadal Science and Technology Shanghai Ocean UniversityShanghai 201306China

This study aimed to restore the ultimate strength of dented stainless-steel hemispheres with a radius of 90 mm and a thickness of 0.86 *** of the hemispheres were subjected to external hydrostatic *** stainless-steel stiffened caps were used to eliminate the effect of indention on the ultimate *** caps had a radius of 36 mm,a thickness of 0.76 mm,and a height of 10.44 *** hemispherical samples,including two intact hemispheres,two dented hemispheres without stiffening,and two dented hemispheres with stiffening,were *** hemi-sphere was geometrically measured for shape and thickness,hydrostatically tested for destruction,and numerically evaluated for *** experimental and numerical data agreed well with each *** a result,a spherical cap can effectively restore the ultimate strength of dented hemispheres under external hydrostatic *** proposed restoration approach can be used to strengthen underwater pressure hulls with large local geometric imperfections.

关键词： hemisphere restoration ultimate strength hydrostatic pressure buckling

Numerical analysis of ultimate strength of concrete filled steel tubular arch bridges

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第8期6卷 859-868页

作者：谢旭陈衡治李辉宋世锐 Department of Civil Engineering Zhejiang University Department of Civil Engineering Ningbo University Centre for Civil & Construction Engineering University of Manchester Manchester

The calculation of ultimate bearing capacity is a significant issue in the design of Concrete Filled Steel Tubular (CFST) arch bridges. Based on the space beam theory, this paper provides a calculation method for determining the ultimate strength of CFST structures. The accuracy of this method and the applicability of the stress-strain relationships were validated by comparing different existing confined concrete uniaxial constitutive relationships and experimental results. Comparison of these results indicated that this method using the confined concrete uniaxial stress-strain relationships can be used to calculate the ultimate strength and CFST behavior with satisfactory accuracy. The calculation results are stable and seldom affected by concrete con-stitutive relationships. The method is therefore valuable in the practice of engineering design. Finally, the ultimate strength of an arch bridge with span of 330 m was investigated by the proposed method and the nonlinear behavior was discussed.

关键词： Concrete Filled Steel Tubular (CFST) Confined concrete Stress-strain relationship ultimate strength

Effect of Strain Rate on ultimate strength and Fractograph in Tungsten Alloy

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Rare Metals 1998年第3期17卷 39-43页

作者：唐长国朱金华周惠久东华大学材料科学与工程系上海西安交通大学陕西西安

The effect of strain rate on ultimate strength and fractograph was investigated for tungsten alloy with four different technologies. As the strain rate rises, the ultimate strength increases and morphology of fracture surface gradually transits from detachment of interface between W pellets and matrices to cleavage of W pellets. Meanwhile, low strength tungsten alloy has higher sensitivity to strain rate.

关键词： Strain rate Tungsten alloy ultimate strength Fractograph

A useful guide of effective mesh-size decision in predicting the ultimate strength of flat-and curved plates in compression

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Journal of Ocean Engineering and Science 2023年第4期8卷 401-417页

作者： Do Kyun Kim Imjun Ban Bee Yee Poh Sung-Chul Shin Department of Naval Architecture and Ocean Engineering College of EngineeringSeoul National UniversitySeoulSouth Korea Research Institute of Marine Systems Engineering Seoul National UniversitySeoulKorea Group of Marine Offshore and Subsea Technology(MOST)School of EngineeringNewcastle UniversityNewcastle upon TyneUK Department of Naval Architecture and Ocean Engineering Pusan National UniversityBusanSouth Korea Ocean and Ship Technology Research Group Department of Civil and Environmental EngineeringPETRONAS University of TechnologySeri IskandarPerakMalaysia

The present study aims to determine the appropriate size of mesh or the number of the element(NoE)for flat-and curved plates,which is suggested to assess its safety subjected to axial compression based on the ultimate limit state(ULS)design and analysis *** unstiffened panel(=plate)and stiff-ened panel,considered primary members of ships and ship-shaped offshore structures,are subjected to repeated axial compression and tension caused by continued vertical bending moments applied to the hull *** are attached with stiffeners by welding,and 6,8 or 10 elements are generally rec-ommended to allocate in flat-plate’s breadth direction in between stiffeners for finite-element(FE)mod-elling,which enables the presentation of the shape of initial deflection applied to the *** the case of the load-shorting curve for curved plate,it is reported that the nonlinear behaviour characteristics,i.e.,snap-through,snap-back,secondary buckling and others,appear in typical flank *** take this into account,we investigated the preferred number of elements(6,8 or 10)generally applied to the flat plate whether it is an appropriate or more fine-sized element(or mesh)that should be considered.A useful guide is documented based on obtained outcomes which may help structural engineers select optimised mesh-size to predict ultimate strength and understand its characteristic of the flat and curved plates.

关键词： ultimate strength Unstiffened panel Longitudinal compression Mesh convergence Finite-element method