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Experiments on channel columns with inclined simple edge stiffeners under compression loading
WANG Chungang, ZHANG Yaochun, ZHANG Zhuangnan
《结构与土木工程前沿(英文)》 2007年 第1卷 第3期 页码 312-321 doi: 10.1007/s11709-007-0041-z
关键词: different post-buckling strength capacity distortional buckling Furthermore
Senping WANG; Xiaolong LIU; Bo YUAN; Minjie SHI; Yanhui WEI
《结构与土木工程前沿(英文)》 2022年 第16卷 第9期 页码 1141-1152 doi: 10.1007/s11709-022-0866-5
关键词: torsional stiffness strength design elastic buckling space truss arches out-of-plane
Thermal buckling behavior of laminated composite plates: a finite-element study
Houdayfa OUNIS,Abdelouahab TATI,Adel BENCHABANE
《机械工程前沿(英文)》 2014年 第9卷 第1期 页码 41-49 doi: 10.1007/s11465-014-0284-z
In this paper, the thermal buckling behavior of composite laminated plates under a uniform temperature distribution is studied. A finite element of four nodes and 32 degrees of freedom (DOF), previously developed for the bending and mechanical buckling of laminated composite plates, is extended to investigate the thermal buckling behavior of laminated composite plates. Based upon the classical plate theory, the present finite element is a combination of a linear isoparametric membrane element and a high precision rectangular Hermitian element. The numerical implementation of the present finite element allowed the comparison of the numerical obtained results with results obtained from the literature: 1) with element of the same order, 2) the first order shear deformation theory, 3) the high order shear deformation theory and 4) the three-dimensional solution. It was found that the obtained results were very close to the reference results and the proposed element offers a good convergence speed. Furthermore, a parametrical study was also conducted to investigate the effect of the anisotropy of composite materials on the critical buckling temperature of laminated plates. The study showed that: 1) the critical buckling temperature generally decreases with the increasing of the modulus ratio EL/ET and thermal expansion ratio αT/αL, and 2) the boundary conditions and the orientation angles significantly affect the critical buckling temperature of laminated plates.
关键词: thermal buckling laminated composite plates anisotropy critical buckling temperature finite-element method high precision rectangular Hermitian element
Experimental investigation and design of aluminum columns with longitudinal welds
Yun WU, Qilin ZHANG
《结构与土木工程前沿(英文)》 2011年 第5卷 第3期 页码 366-373 doi: 10.1007/s11709-011-0101-2
关键词: aluminum alloy longitudinal weld heat-affected zone (HAZ) reduced strength zone (RSZ) buckling column experimental study
Nicholas KEAGE, Christopher MAIOLO, Rebecca PIEROTTI, Xing MA
《结构与土木工程前沿(英文)》 2011年 第5卷 第3期 页码 335-343 doi: 10.1007/s11709-011-0121-y
关键词: compressive buckling thin steel skins unilateral contact rigid constraints
Finding buckling points for nonlinear structures by dynamic relaxation scheme
Mohammad REZAIEE-PAJAND, Hossein ESTIRI
《结构与土木工程前沿(英文)》 2020年 第14卷 第1期 页码 23-61 doi: 10.1007/s11709-019-0549-z
关键词: load factor external work dynamic relaxation static equilibrium path large displacement
基于高等分析的钢结构设计——材料建模与应变极限 Research Article
Leroy Gardner, Xiang Yun, Andreas Fieber, Lorenzo Macorini
《工程(英文)》 2019年 第5卷 第2期 页码 243-249 doi: 10.1016/j.eng.2018.11.026
我们对于钢框架的结构分析通常通过梁单元来进行。然而,由于该类单元无法确切地捕捉钢材截面的局部屈曲行为,因此,传统的钢结构设计规范采用截面分类的概念来确定截面强度以及变形能力受材料局部屈曲影响的程度。而塑性设计方法的使用仅限于 1 级截面,其具有足够的转动能力以形成塑性铰并引发倒塌机制。在更高级截面中,局部屈曲阻止了具有这种转动能力的塑性铰的形成,除非出于计算需求而使用壳单元,否则我们需要对材料进行弹性分析。然而,本文证明了通过将连续强度法(CSM)及其应变极限纳入分析,可以在梁单元中有效地模拟局部屈曲。此外,通过进行几何非线性和材料非线性的高等分析,可确保无需进行额外的设计检查。如果采用适当而精确的应力 - 应变关系,我们在较粗截面中观察到的应变硬化所带来的积极影响亦可以得到有效应用;为此,我们在文详尽地描述了一个用于热轧钢的四元线性材料模型。对于一致的高等分析框架中任意细长比截面的分析问题, CSM 应变极限分析法均适用,同时还可以从荷载重新分配水平的优化中受益。本文所提出的方法可用于单个构件、连续梁单元及相关框架结构,并且在精度与一致性等方面与当前钢结构设计规范相比,本方法具有显著优势。
Flexural-torsional buckling behavior of aluminum alloy beams
Xiaonong GUO,Zhe XIONG,Zuyan SHEN
《结构与土木工程前沿(英文)》 2015年 第9卷 第2期 页码 163-175 doi: 10.1007/s11709-014-0272-8
关键词: flexural-torsional buckling aluminum alloy beams (AAB) finite element method (FEM) theoretical formula
《结构与土木工程前沿(英文)》 页码 179-190 doi: 10.1007/s11709-022-0888-z
关键词: uncertain composite plate stochastic assume mode method Karhunen−Loève theorem polynomial chaos approach plate buckling irregularity in buckling mode shapes
Lokavarapu Bhaskara Rao, Chellapilla Kameswara Rao
《机械工程前沿(英文)》 2013年 第8卷 第3期 页码 291-297 doi: 10.1007/s11465-013-0255-9
This work presents the existence of buckling mode switching with respect to the radius of concentric rigid ring support. The buckling mode may not be axisymmetric as previously assumed. In general, the plate may buckle in an axisymmetric mode but when the radius of the ring support becomes small, the plate may buckle in an asymmetric mode. The optimum radius of the concentric rigid ring support for maximum buckling load is also determined. Introducing internal rigid ring support, when placed at an optimal position increases the elastic buckling load capacity by 149.39 percent. The numerical results obtained are in good agreement with the previously published data.
关键词: buckling circular plate elastically restrained edge rigid ring support mode switching
Experimental study on slender buckling-restrained knee braces with round steel bar cores
《结构与土木工程前沿(英文)》 2023年 第17卷 第1期 页码 99-121 doi: 10.1007/s11709-022-0875-4
关键词: weld-free beam-to-column connections moment-resisting frame cyclic and compression loading tests buckling-restrained knee brace cover tube
Yasser SHARIFI,Sajjad TOHIDI
《结构与土木工程前沿(英文)》 2014年 第8卷 第2期 页码 167-177 doi: 10.1007/s11709-014-0236-z
关键词: steel I-beams lateral-torsional buckling finite element (FE) method artificial neural network (ANN) approach
拓扑优化中采用增材制造填充构件的结构屈曲荷载提升设计 Artical
Anders Clausen, Niels Aage, Ole Sigmund
《工程(英文)》 2016年 第2卷 第2期 页码 250-257 doi: 10.1016/J.ENG.2016.02.006
增材制造可实现优质多功能构件所具有的高度复杂几何构型的制备。可以直接制备内含多孔填充的结构部件是其独有特征的一个例证。现有的设计方法还难以充分利用这一设计自由度,直接获得类似结构的设计。本文将展示涂层方法 (coating approach) 的拓扑优化方法来作为多孔填充构件的设计方法,所设计的构件具有显著改进的临界屈曲载荷,从而使得整体结构部件的稳定性增强。传统的柔顺性拓扑优化方法极少在数学模型中考虑构件的屈曲约束,稳定性要求通常要经过后续的校核与改进过程满足。这一后续过程往往只能获得次优设计。本文所展示的方法弥补了传统柔顺性拓扑优化模型中难以考虑构件屈曲约束的缺陷。利用涂层拓扑优化方法与传统柔顺性拓扑优化同时对经典的MBB 梁进行设计,并采用熔丝增材制造技术对设计结果进行了制备。实验结果验证了涂层方法的数学模型的正确性。由于填充材料的性质,在相同条件下,涂层优化得到的多孔填充结构的屈曲载荷比传统优化得到的实体结构高四倍以上。
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《医学前沿(英文)》 2016年 第10卷 第4期 页码 437-443 doi: 10.1007/s11684-016-0472-9
A phase II study (A2202) was performed to evaluate the efficacy and safety of JAK inhibitor ruxolitinib in 63 Chinese MF patients. Ruxolitinib was given twice a day (bid) at a starting dose of 15 mg (n=25) or 20 mg (n=38) based on a baseline platelet count. About 94.7% of the patients achieved a reduction in spleen size, 27.0% of which exhibited significant reduction (≥35%) at week 24. Significant improvement in debilitating constitutional symptoms, as assessed by MFSAF v2.0, was observed in patients treated with ruxolitinib. Ruxolitinib treatment was generally well tolerated by Chinese patients. Although the treatment was associated with an increase in certain adverse events (AEs) that were established as identified risks (anemia and thrombocytopenia), these AEs were considered manageable in this clinical setting. Ruxolitinib provided substantial reductions in splenomegaly and improvements in symptoms, and was well-tolerated by Chinese patients with MF.
Proposing two new methods to decrease lateral-torsional buckling in reduced beam section connections
Samira EBRAHIMI; Nasrin BAKHSHAYESH EGHBALI; Mohammad Mehdi AHMADI
《结构与土木工程前沿(英文)》 2022年 第16卷 第12期 页码 1581-1598 doi: 10.1007/s11709-022-0886-1
关键词: RBS RBS-ST RW-RBS lateral-torsional buckling cyclic performance
标题 作者 时间 类型 操作
Experiments on channel columns with inclined simple edge stiffeners under compression loading
WANG Chungang, ZHANG Yaochun, ZHANG Zhuangnan
期刊论文
Out-of-plane elastic buckling load and strength design of space truss arch with a rectangular section
Senping WANG; Xiaolong LIU; Bo YUAN; Minjie SHI; Yanhui WEI
期刊论文
Thermal buckling behavior of laminated composite plates: a finite-element study
Houdayfa OUNIS,Abdelouahab TATI,Adel BENCHABANE
期刊论文
Experimental investigation and design of aluminum columns with longitudinal welds
Yun WU, Qilin ZHANG
期刊论文
Experimental study and numerical simulation on compressive buckling behavior of thin steel skins in unilateral
Nicholas KEAGE, Christopher MAIOLO, Rebecca PIEROTTI, Xing MA
期刊论文
Finding buckling points for nonlinear structures by dynamic relaxation scheme
Mohammad REZAIEE-PAJAND, Hossein ESTIRI
期刊论文
Probabilistic stability of uncertain composite plates and stochastic irregularity in their buckling mode
期刊论文
Fundamental buckling of circular plates with elastically restrained edges and resting on concentric rigid
Lokavarapu Bhaskara Rao, Chellapilla Kameswara Rao
期刊论文
Lateral-torsional buckling capacity assessment of web opening steel girders by artificial neural networks
Yasser SHARIFI,Sajjad TOHIDI
期刊论文
Efficacy and safety of JAK inhibitor INC424 in patients with primary and post-polycythemia vera or post-essential
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期刊论文