Geometric non-linear analysis of thin plate structures using the harmonic coupled finite strip method

The paper describes a modified finite strip method embracing the harmonic coupled Fourier series treatment. The well known uncoupled formulation, first developed in the context of thin plate bending analysis, represents a semi-analytical finite element process. As far as linear analysis is concerned, it takes advantage of the orthogonality properties of harmonic functions in the stiffness matrix formulation. However in the case of the geometric stiffness matrix calculation, the integral expressions contain the products of trigonometric functions with higher-order exponents, and here the orthogonality characteristics are no longer valid. All harmonics are coupled, and the stiffness matrix order and bandwidth are proportional to the number of harmonics used.     

Elastic buckling analysis of perforated thin-walled structures by the isoparametric spline finite strip method

This paper presents the application of the isoparametric spline finite strip method to the elastic buckling analysis of perforated folded-plate structures. The general theory of the isoparametric spline finite strip method is introduced. The kinematics assumptions, strain–displacement and constitutive relations of the Mindlin plate theory are described and applied to the spline finite strip method. The corresponding matrix formulation is utilised in the equilibrium and stability equations to derive the stiffness and stability matrices. A number of numerical examples of flat and folded perforated plate structures illustrate the applicability and accuracy of the proposed method.     

钢板剪力墙低周反复荷载试验研究

本文进行了6个13比例钢板剪力墙的低周反复荷载试验,重点研究了钢板墙极限承载力和滞回性能,为钢板墙结构利用屈曲后强度及抗震设计提供试验依据;本试验揭示了边柱局部屈曲、加劲肋布置形式、加劲板刚度和板高厚比对钢板墙滞回性能的影响。试验结果表明,边柱不出现局部屈曲是钢板墙发挥极限承载力的重要保证;厚板和较强的加劲肋对提高钢板墙滞回曲线的饱满度和滞回环面积是有利的;三种钢板墙以交叉加劲板的承载力和滞回性能最佳,十字加劲板次之,钢板墙结构耗能能力依赖于钢板与边柱的弹塑性变形和钢板面外鼓曲变形。试验曲线与应用弹塑性大挠度有限元法计算的滞回曲线吻合良好;利用屈曲后强度的钢板墙受剪承载力,其试验值与本课题建议公式及有限元值计算结果基本一致。     

受压波纹板组局部相关屈曲特性研究

拱型波纹钢屋盖结构是一种典型的冷弯薄壁结构,其波纹截面板组的宽厚比远远超过有关规范宽厚比限值的上限要求,结构的极限承载能力既取决于其整体稳定承载能力也取决于其局部相关屈曲承载能力。本文根据拱型波纹钢屋盖结构的成型特点和受力特性,建立了波纹槽形截面板组局部相关屈曲分析的有限元模型,对不同宽厚比的受压波纹槽形截面板组的局部相关屈曲特性进行了理论计算,并与同形状同尺寸平板槽形截面板组的屈曲特性进行了比较分析。研究结果表明,如同平板板组一样,波纹板组也可能发生局部相关屈曲,但其板组屈曲半波长要受制于小波纹的几何尺寸,即屈曲半波应位于波形构造的波节点之间或波峰、波谷之间,而平板槽形截面板组的屈曲波长则可以自由调节,这点与平板板组的屈曲特性存在明显的差异。并且波纹的存在对板组屈曲性能有显著提高。理论研究与相应的试验研究符合很好。     

Elastic/plastic buckling of a composite flat plate subjected to uniform edge compression

A theoretical approach, based on the plastic theory, has been developed for studying the elastic/plastic buckling behavior of a simply supported rectangular anisotropic plate subjected to edge compression. The said approach was employed to determine the critical buckling stresses of three different types of fiber reinforced composite plates, namely, carbon epoxy, glass epoxy and boron aluminum plates. Since the proposed approach is for a preliminary prediction of critical buckling loads of composite plates, the results obtained are deemed acceptable compared with those obtained by other authors experimentally.     

剖分T型钢轴心压杆试验研究

钢结构设计规范对热轧H型钢剖分T型钢轴心受压杆件腹板高厚比的限值做了修订。但其理论推导所做的假设偏于不安全，为了利于热轧H型钢剖分T型钢这种材料的推广利用，有必要做试验验证其修订的合理性。本次试验选取了3类T形截面，每类截面取5种不同的长细比，共15个轴心受压试件，并做了相应的材性试验。通过试验发现，修正后的T型钢腹板宽厚比限值对于大部分情况是安全适用的，但对于长细比较小的试件修订后的限值偏大。     

Strength and behavior of steel plate–concrete wall structures using ordinary and eco-oriented cement concrete under axial compression

The main objectives of this study are to describe the compressive behavior and to determine the squash load of steel plate–concrete (SC) wall structures using ordinary and eco-oriented cement concrete. The major parameters in this research were the material of the concrete and width–thickness (B/t) ratio of surface steel plate. Six SC wall specimens were tested in compression in this test. In the three specimens, to reduce emissions of carbon dioxide (CO₂), some of the cement in weight was replaced by the Hwangtho (red clay) which is traditional and environmental material. The failure behavior, buckling behavior of the surface steel plate, the effective buckling length factors and plate buckling coefficient are discussed. Based on the test results, simplified rule was suggested to evaluate the buckling stress for surface steel plate. Several comparisons were made to evaluate the predicted strengths and test results.     

行走激励下大跨度空腹夹层板结构振动舒适度分析

随着大跨结构的发展,舒适度已成为评价楼盖结构性能的重要指标。针对大跨度空腹夹层板楼盖,考虑行走路线和步行频率影响进行了振动响应计算。分析表明,空腹夹层板的自振特性类似于实心平板,低阶振型主要表现为竖向振动;采用行走路线法评价楼盖舒适度时,应根据实际情况采用较长的路线并使其通过低阶振型中心;定点激励法计算的峰值加速度要低于通过低阶振型中心行走路线的计算结果,据此评价楼盖舒适度是有局限性的;楼盖上不同感受点的加速度响应峰值是不同的,较大的加速度响应峰值只出现在低阶振型中心周围。     

Linear elastic isoparametric spline finite strip analysis of perforated thin-walled structures

This paper describes the application of the isoparametric spline finite strip method to the linear elastic analysis of tri-dimensional perforated folded plate structures. The general theory of the isoparametric spline finite strip method is introduced. Kinematics assumptions and the procedure for combining in-plane (membrane) and bending effects are set out. Particular attention is paid to the procedure for rotating the stiffness matrix and load vector from local to global coordinates. The reliability of the method is demonstrated by comparisons with finely meshed finite element analysis results. Square stiffened perforated plates in compression and bending are analysed.     

Behaviour of composite columns of closed cross-section under in-plane compressive pulse loading

In this work the dynamic stability analysis of composite columns of closed cross-section is performed. The columns are subject to pulse loading of finite duration. The influence of imperfection sensitivity, orthotropy level and lamination angle on the dynamic buckling load are investigated. The effect of material properties in elastic–plastic range is also studied. The numerical results obtained from FEM solution are presented in diagrams. The consequences of application of different dynamic stability criteria are discussed as well.     

拱型折板结构的塑性极限分析

本在献(1)基础上，用单元板力法求出拱型折板结构的棱边弯矩．再用上限定理与下限定理分别求出各折板塑性极限荷载的上限与下限值．     

Strengthening of perforated plates under uniaxial compression: Buckling analysis

This paper focuses on the cutout-strengthening of perforated steel plates subjected to uniaxial compressive loads. The square plates considered each has a centrally placed circular hole and four simply supported edges in the out-of-plane direction. Four types of stiffeners named ringed stiffener (RS), flat stiffener (FS), longitudinal stiffener (LS) and transverse stiffener (TS) are mainly discussed. The finite element method (FEM) has been employed to analyse the elastic and elasto-plastic buckling behaviors of strengthened and unstrengthened perforated plates. The results show that the strengthened perforated plates have higher buckling strengths than those of the unstrengthened ones, while the elevations in elastic buckling stress and elasto-plastic ultimate strength are closely related to stiffener types (i.e., RS, FS, LS and TS) as well as plate geometric parameters (i.e., a plate slenderness ratio and a hole diameter ratio). Furthermore, comparisons of strengthening efficiency considering the variations of buckling stress with stiffener weight are carried out, and recommendations on the most efficient cutout-strengthening methods for the uniaxially compressed perforated square plates with centric circular holes are proposed.     

钢板-砖砌体组合短柱轴心受压性能试验研究与理论分析

为了研究钢板-砖砌体组合柱中对拉螺栓间距、钢板厚度与结构胶侧向黏结力对钢板局部屈曲的影响,对6个钢板-砖砌体组合短柱试件进行轴心受压试验。结果表明,随着钢板厚度的增加、螺栓间距与钢板厚度之比的减小,钢板局部屈曲变形程度相对降低;可见屈曲荷载与极限荷载的比值为70%~85%左右;在有结构胶侧向黏结力作用下,钢板的局部屈曲发展受到一定程度的约束,使得采用应变片读数判断的钢板局部屈曲临界点与钢板发生可见屈曲变形时对应的荷载值可能存在差异。基于试验数据,通过拟合分析得到钢板发生可见屈曲变形时的钢板应力计算模型,提出轴心受压钢板-砖砌体组合柱钢板发生可见屈曲变形时的承载力计算式。通过与试验结果的对比可知,提出的计算方法可以用于指导类似构件的设计。     

蒙皮板整体剪切屈曲性能试验及有限元分析

在蒙皮体的各种破坏形式中,整体剪切屈曲破坏是具有控制作用的破坏形式之一。对目前国内常用的YX20-166-830型压型钢板组成的6个不同边界连接的蒙皮板进行了抗剪试验研究,探讨边界连接形式对整体屈曲荷载的影响。在试验的基础上进行了有限元分析,将试验结果、有限元计算结果和理论结果进行了比较。屈曲荷载的试验值与有限元计算值相差较小,可见有限元计算模型可以作为进行蒙皮体抗剪性能分析的辅助手段。另外,通过屈曲荷载的试验值和简化公式值比较,得到了边界连接形式对整体屈曲荷载的影响,进一步完善了蒙皮板整体剪切屈曲的计算公式。     

设直肋方形薄壁钢管混凝土短柱的试验研究与有限元分析

为改善薄壁钢管混凝土柱的力学性能,提出了设冷弯直肋方形薄壁钢管混凝土柱的新型结构形式。进行了无肋、单向设直肋和双向设直肋的3种截面形式、200mm×200mm和300mm×300mm两种截面尺寸的18个薄壁钢管混凝土轴压短柱的试验。结果表明:设肋的薄壁钢管混凝土短柱以剪切破坏模式为主;肋与混凝土在试件破坏之前,均能保持良好粘结。截面为200mm×200mm设直肋的短柱能达到较高的极限承载力,与无肋的试件相比,单向设直肋短柱的极限承载力提高了15%,双向设直肋的提高了26%。采用有限元程序ABAQUS 6.4进行了模拟计算,计算结果与试验结果吻合良好;通过数值计算,研究了截面尺寸相同的素混凝土短柱及无肋、单向、双向设直肋薄壁钢管混凝土轴压短柱的柱中截面混凝土纵向应力的分布规律,为深入开展设肋薄壁钢管混凝土短柱的研究提供了依据。     

设对拉片方形薄壁钢管混凝土短柱的试验研究与有限元分析

为改善薄壁钢管混凝土柱的力学性能,提出了内部设置横向对拉片的薄壁钢管混凝土柱的新型结构形式。通过对无对拉片、单向和双向设置对拉片3种截面形式、2种对拉片纵向设置间距为100mm和200mm的15个薄壁钢管混凝土轴压短柱的试验研究,比较和分析了构件的试验现象、破坏形式、荷载-位移曲线等。结果显示:设对拉片的薄壁钢管混凝土短柱以剪切破坏模式为主,对拉片与混凝土的粘结在短柱压溃之前均能保持共同工作;设置间距为100mm时,对拉片能有效改善薄壁钢管混凝土短柱的工作性能,与无对拉片试件相比,设置单向对拉片短柱的极限承载力提高了22.5%,设置双向对拉片的提高了27.4%;设置间距为200mm时,对拉片对短柱的极限承载力提高的作用不大。因此对拉片的间距是影响试件承载力的主要因素,间距越密承载力越高。采用有限元程序ABAQUS 6.4对试件进行了分析,计算与试验结果吻合较好;通过研究各试件柱中截面混凝土的纵向应力分布情况,阐述了设对拉片短柱的受力机理。     

纵向变厚度钢板焊接工字形截面受压短柱的局部稳定试验研究

纵向变厚度(LP)钢板是一种沿轧制方向具有不同厚度钢板的钢材,可用于优化结构的力学性能和提高材料利用率。为研究其局部稳定性能,设计了6根LP翼缘焊接工字形截面短柱,6根LP腹板焊接工字形截面短柱和4根传统等厚度焊接工字形截面短柱,并进行了轴向受压试验。试验研究中确定板临界屈曲荷载的两个主要屈曲准则,同时分析了破坏模式、荷载-侧向变形曲线、荷载-应变曲线和极限荷载,研究LP短柱的局部屈曲行为,得到试件更容易在LP钢板的薄端发生屈曲破坏。将试验结果与现有等厚度板设计规范计算结果进行比较可得,现有等厚度板的设计规范预测腹板变厚度短柱的极限荷载偏于危险,而对于翼缘变厚度短柱欧规EN 1993-1-5能较为准确预测,但需要进一步的数值模拟去验证,从而进一步提出修正公式或者修正系数来指导设计。     

A new approach for free vibration analysis of nonuniform tall building structures with axial force effects

Dynamic analysis of beam‐like structures is significantly important in modeling actual cases such as tall buildings and several other related applications as well. This article studies free vibration analysis of tall buildings with nonuniform cross‐section structures. A novel and simple approach is presented to solve natural frequencies of free vibration of cantilevered tall structures with variable flexural rigidity and mass densities. These systems could be replaced by a cantilever Timoshenko beam with varying cross‐sections. The governing partial differential equation for vibration of a nonuniform Timoshenko beam under variable axial loads is transformed with varying coefficients to its weak form of integral equations. Natural frequencies can be determined by requiring the resulting integral equation, which has a nontrivial solution. The presented method in this study has fast convergence. Including high accuracy for the obtained numerical results as well. Numerical examples including framed tube as well as tube‐in‐tube structures are carried out in the study and compared with available results in the literature, and also with the results obtained from finite element analysis in order to show the accuracy of the proposed method in the study. Obtained results indicate that the presented method in this study is powerful enough for the free vibration analysis of tall buildings.     

钢结构集成房屋模块间十字形板-端板连接节点轴压性能研究

现有钢结构模块化建筑的连接节点大多难以用于集成房屋模块间的连接,为此,提出一种十字形板.端板连接件.通过对两个节点试件进行轴压试验,研究节点在轴压荷载作用下的破坏模式和承载力.采用ABAQUS建立试件的有限元模型,有限元分析结果与试验结果吻合较好,验证了有限元模型的正确性.采用该有限元模型分析了十字形板厚、端板厚和柱壁...     

钢筋网架-砼组合结构夹芯墙板受剪试验研究

研究了钢筋网架—砼组合结构夹芯墙板(简称ZW夹芯墙板)平面内偏压受剪的性能.试验制作了2个相同的ZW夹芯墙板构件,采用建筑抗震试验方法规程中的拟静力法进行了试验研究,得出了ZW体系夹芯墙板平面内偏压受剪时钢筋及砼板的应力应变、滞回曲线、承载力、裂缝开展及破坏形态,验证合厚度砼墙板模型的成立;最后给出ZW体系夹芯墙板的偏压受剪承载力公式.