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A Symplectic Method of Numerical Simulation on local buckling for Cylindrical Long Shells under Axial Pulse Loads

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Structural Durability & Health Monitoring 2021年第1期15卷 53-67页

作者： Kecheng Li Jianlong Qu Jinqiang Tan Zhanjun Wu Xinsheng Xu State Key Laboratory of Structure Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian116024China

In this paper,the local buckling of cylindrical long shells is discussed under axial pulse loads in a Hamiltonian *** this system,critical loads and modes of buckling of shells are reduced to symplectic eigenvalues and eigensolutions *** the symplectic method,the solution of the local buckling of shells can be employed to the expansion series of symplectic eigensolutions in this *** a result,relationships between critical buckling loads and other factors,such as length of pulse load,thickness of shells and circumferential orders,have been *** the same time,symmetric and unsymmetric buckling modes have been ***,numerical results show that modes of post-buckling of shells can be Bamboo node-type,bending type,concave type and so *** in this paper provides analytical supports for ultimate load prediction and buckling failure assessment of cylindrical long shells under local axial pulse loads.

关键词： Hamiltonian system symplectic method local buckling buckling analysis cylindrical long shell axial pulse load

Experimental Analysis on local buckling of GFRP?Foam Sandwich Pipe Under Axial Compressive Loading

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第1期37卷 129-142页

作者： CHEN Li CHEN Li PAN Darong ZHAO Qilin NIU Longlong School of Architecture Engineering Nanjing Institute of TechnologyNanjing 211167P.R.China Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of Education Southeast UniversityNanjing 211189P.R.China School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211816P.R.China

To find out the local buckling behaviors of glass fiber reinforced plastic(GFRP)-foam sandwich pipe suffering axial loading,a series of quasi-static axial compression tests are carried out in the *** with the test data,systematic numerical analysis on the local buckling behavior of this sandwich pipe is also conducted,and the buckling failure mechanism is *** influences of the key parameters on bearing capacity of the sandwich structure are *** and numerical results show that the local buckling failure of the GFRPfoam sandwich pipe is dominated basically by two typical modes,i.e.,the conjoint buckling and the layered *** buckling at the end,shear failure at the end and interface peeling failure are less efficient than the local buckling failure at the middle height,and ought to be restrained by appropriate structural *** local buckling bearing capacity increases linearly with the core density of the sandwich pipe *** the core density is relatively high(higher than 0.05 g/cm3),the effect of increasing the core density on improving the bearing efficiency is less on the specimens with a large ratio of the wall thickness to the radius than on those with a small *** layered buckling is another failure mode with lower bearing efficiency than the local conjoint buckling,and it can be restrained by increasing the core density to ensure the cooperation of the inner and the outer GFRP surface *** bearing capacity of the GFRP-foam sandwich pipe increases with the height-diameter ratio;however,the bearing efficiency decreases with this parameter.

关键词： sandwich pipe polyurethane foam glass fiber reinforced plastic(GFRP) local buckling axial compression

Numerical analysis and experimental investigation of wind turbine blades with innovative features:Structural response and characteristics

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Science China(Technological Sciences) 2015年第1期58卷 1-8页

作者： CHEN Xiao QIN ZhiWen YANG Ke ZHAO XiaoLu XU JianZhong National Laboratory of Wind Turbine Blade Research & Development Center Institute of Engineering ThermophysicsChinese Academy of Sciences

Innovative features of wind turbine blades with flatback at inboard region,thick airfoils at inboard as well as mid-span region and transversely stepped thickness in spar caps have been proposed by Institute of Engineering Thermophysics,Chinese Academy of Sciences(IET-Wind)in order to improve both aerodynamic and structural efficiency of rotor *** verify the proposed design concepts,this study first presented numerical analysis using finite element method to clarify the effect of flatback on local buckling strength of the inboard *** models with various loading cases,inboard configurations,and core materials were comparatively ***,a prototype blade incorporated with innovative features was manufactured and tested under static bending loads to investigate its structural response and *** was found that rotor blades with flatback exhibited favorable local buckling strength at the inboard region compared with those with conventional sharp trailing edge when low-density PVC foam was *** prototype blade showed linear behavior under extreme loads in spar caps,aft panels,shear web and flatback near the maximum chord which is usually susceptible to buckling in the blades according to traditional *** inboard region of the blade showed exceptional load-carrying capacity as it survived420%extreme loads in the *** this study,potential structural advantages by applying proposed structural features to large composite blades of multi-megawatt wind turbines were addressed.

关键词： wind energy rotor blade flatback local buckling extreme loads

Quantitative investigation on collapse margin of steel high-rise buildings subjected to extremely severe earthquakes

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Earthquake Engineering and Engineering Vibration 2018年第3期17卷 445-457页

作者： Lin Xuchuan Mikiko Kato Zhang Lingxin Masayoshi Nakashima Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbinChina Nikken Sekkei LTD. OsakaJapan Kyoto University KyotoJapan Kobori Research Complex TokyoJapan

Reponses of structures subjected to severe earthquakes sometimes significantly surpass what was considered in the *** is important to investigate the failure mechanism and collapse margin of structures beyond design,especially for high-rise *** this study,steel high-rise buildings using either square concrete-filled-tube（CFT） columns or steel tube columns are designed.A detailed three-dimensional（3 D） structural model is developed to analyze the seismic behavior of a steel high-rise towards a complete *** effectiveness is verified by both component tests and a full-scale shaking table *** collapse margin,which is defined as the ratio of PGA between the collapse level to the design major earthquake level（Level 2）,is quantified by a series of numerical simulations using incremental dynamic analyses（IDA）.The baseline building using CFT columns collapsed with a weak first story mechanism and presented a collapse margin ranging from 10 to *** significant variation in the collapse margin was caused by the different characteristics of the input ground *** building using equivalent steel columns collapsed earlier due to the significant shortening of the locally buckled columns,exhibiting only 57% of the collapse margin of the baseline *** influence of reducing the height of the first story was quite *** shortened first story not only enlarged the collapse margin by 20%,but also changed the collapse mode.

关键词： collapse quantification steel high-rise building numerical models local buckling collapse mechanism

Bending Failure Mode and Prediction Method of the Compressive Strain Capacity of A Submarine Pipeline with Dent Defects

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China Ocean Engineering 2024年第4期38卷 636-647页

作者： HOU Fu-heng JIA Lu-sheng CHEN Yan-fei ZHANG Qi ZHONG Rong-feng WANG Chun-sha School of Mechanical and Transportation Engineering China University of PetroleumBeijingBeijing 102249China CNOOC Research Institute Ltd.Beijing 100028 China

A dent is a common type of defects for submarine *** submarine pipelines,high hydrostatic pressure and internal pressure are the main *** pipelines bend due to complex subsea conditions,the compression strain capacity may be *** into the local buckling failure and accurate prediction of the compressive strain capacity are important.A finite element model of a pipeline with a dent is *** buckling failure under a bending moment is investigated,and the compressive strain capacity is *** effects of different parameters on pipeline local buckling are *** results show that the dent depth,external pressure and internal pressure lead to different local buckling failure modes of the pipeline.A higher internal pressure indicates a larger compressive strain capacity,and the opposite is true for external *** the ratio of external pressure to collapse pressure of intact pipeline is greater than 0.1,the deeper the dent,the greater the compressive strain capacity of the *** as the ratio is less than 0.1,the opposite is *** the basis of these results,a regression equation for predicting the compressive strain capacity of a dented submarine pipeline is proposed,which can be referred to during the integrity assessment of a submarine pipeline.

关键词： submarine pipeline dent defect bending load local buckling compressive strain capacity

buckling ANALYSIS UNDER COMBINED LOADING OF THIN-WALLED PLATE ASSEMBLIES USING BUBBLE FUNCTIONS

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Acta Mechanica Solida Sinica 2000年第2期13卷 125-133页

作者： Gao Xuanneng Zou Yinsheng ZHOU Xuhong Department of Civil Engineering Nanchang UniversityNanchang 330029China Institute of Structural Engineering Hunan UniversityChangsha 410082China

Bubble functions are finite element modes that are zero on the boundary of the element but nonzero at the other point. The present paper adds bubble functions to the ordinary Complex Finite Strip Method(CFSM) to calculate the elastic local buckling stress of plates and plate assemblies. The results indicate that the use of bubble functions greatly improves the convergence of the Finite Strip Method(FSM) in terms of strip subdivision, and leads to much smaller storage required for the structure stiffness and stability matrices. Numerical examples are given, including plates and plate structures subjected to a combination of longitudinal and transverse compression, bending and shear. This study illustrates the power of bubble functions in solving stability problems of plates and plate structures.

关键词： local buckling bubble functions finite strip method(FSM) complex finite strip method (CFSM) plates and plate assemblies longitudinal(transverse) compression bending and shear

Seismic performance of double-skin steel-concrete composite box piers: Part Ⅱ—Nonlinear finite element analysis

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Journal of Southeast University(English Edition) 2016年第1期32卷 346-355页

作者：夏坚宗周红徐焯然李明鸿福州大学土木工程学院福州350116 福建省建筑科学研究院福州350025 东南大学土木工程学院南京210096

An accurate finite element （ FE） model was constructed to examine the hysteretic behavior of double-skin steel-concrete composite box （ DSCB） piers for further understanding the seismic performance of DSCB piers; where the local buckling behavior of steel tubes, the confinement of the in-filled concrete and the interface action between steel tube and in-filled concrete were considered. The accuracy of the proposed FE model was verified by the bidirectional cyclic loading test results. Based on the validated FE model, the effects of some key parameters, such as section width to steel thickness ratio, slenderness ratio, aspect ratio and axial load ratio on the hysteretic behavior of DSCB piers were investigated. Finally, the skeleton curve model of DSCB piers was proposed. The numerical simulation results reveal that the peak strength and elastic stiffness decrease with the increase of the section width to steel thickness ratio. Moreover, the increase of the slenderness ratio may result in a significant reduction in the peak strength and elastic stiffness while the ultimate displacement increases. The proposed skeleton curve model can be taken as a reference for seismic performance analyses of the DSCB piers.

关键词： double-skin steel-concrete composite box(DSCB) pier finite element analysis local buckling hysteretic behavior skeleton curve model

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Structural Integrity Assessment of Offshore Jackets Considering Proper Modeling of buckling in Tubular Members-a Case Study of Resalat Jacket

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Journal of Marine Science and Application 2022年第4期21卷 145-167页

作者： Mohammad Hadi Erfani Department of Mechanical Engineering Sharif University of TechnologyTehran ***Iran

In the present research,results of buckling analysis of 384 finite element models,verified using three different test results obtained from three separate experimental investigations,were used to study the effects of five parameters such as D/t,L/D,imperfection,mesh size and mesh size ***,proposed equations by offshore structural standards concerning global and local buckling capacity of tubular members including former API RP 2A WSD and recent API RP 2A LRFD,ISO 19902,and NORSOK N-004 have been compared to FE and experimental *** of the most crucial parts in the estimation of the capacity curve of offshore jacket structures is the correct modeling of compressive members to properly investigate the interaction of global and local buckling which leads to the correct estimation of performance levels and *** of the proper compressive behavior of tubular members validated by experimental data is the main purpose of this *** of compressive braces of offshore jacket platforms by 3D shell or solid elements can consider buckling modes and deformations due to local *** FE software is selected for FE *** scope of action of each of elastic buckling,plastic buckling,and compressive yielding for various L/r ratios is ***,the most affected part of each parameter on the buckling capacity curve is *** pushover results of the Resalat Jacket with proper versus improper modeling of compressive members have been compared as a case *** to the results,applying improper mesh size for compressive members can under-predict the ductility by 33%and under-estimate the lateral loading capacity by up to 8%.Regarding elastic stiffness and post-buckling strength,the mesh size ratio is introduced as the most effective ***,imperfection is significantly the most important parameter in terms of critical buckling load.

关键词： Critical buckling load Compressive behavior Post-buckling strength local buckling Tubular members Jacket type offshore platforms

Effect of Web Opening on buckling Instability of Simply Supported Steel I-Beam

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Journal of Civil Engineering and Architecture 2011年第9期5卷 809-818页

作者： Mohammed Hassanien Serror Department of Structural Engineering Faculty of Engineering Cairo University Egypt

The lateral torsional buckling phenomenon often governs design of steel I-beams. Although web opening is often used to accommodate the required mechanical and piping works in buildings, its effect on the buckling instability is not considered in the design codes. In this paper, the effect of web opening on both lateral torsional buckling and local buckling behaviors has been investigated. A simply supported steel I-beam has been studied under uniform bending moment around the major axis. buckling analysis has been performed using the finite element method. Linear regression analysis has been conducted for output data to formulate an equation for the critical moment including web opening effect. The results have shown a limited reduction in the lateral torsional buckling capacity and a significant reduction in the local buckling capacity.

关键词： Lateral torsional buckling local buckling simply supported I-Beam uniform bending web opening