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《土木工程学报》2015,(10)
波浪腹板工形构件在国内外除了用于工业厂房的梁柱外,还应用于工业厂房中的吊车梁。应用此种构件可以克服采用高而薄的平腹板工形构件必须设置横向加劲肋的缺点。吊车梁直接承受动力荷载,其承载力往往由其疲劳寿命控制。国内外现有对波形腹板构件疲劳性能的试验及理论研究多集中于梯形波折腹板工形构件,对波浪腹板工形构件的研究还很少。通过两根足尺试件的疲劳试验研究以及理论分析给出了波浪腹板工形构件的疲劳设计建议,获得了按照我国目前《钢结构设计规范》中疲劳验算的分类(属于2类)。此外,通过有限元软件详细分析了疲劳破坏位置附近的正应力与剪应力的分布及变化规律,剖析了影响疲劳的主要因素,验证了试验结果。通过比较平腹板、梯形波折腹板、波浪腹板工形截面梁的疲劳性能,指出波浪腹板工形构件的疲劳寿命优于梯形波折腹板构件,略逊于平腹板构件。最后根据一工程设计实例,给出波浪腹板吊车梁疲劳验算的方法。 相似文献
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波纹腹板用于提高钢梁腹板剪切稳定性和避免横向加劲。研究梯形波纹钢腹板的剪切强度,总结了以往梯形钢腹板的剪切强度公式及相应理论。提出新的剪切强度公式,考虑不同剪切失效模式的相互影响。根据相关试验的试件参数,对100多个试验结果进行整理和分析。大多数试验条件都与剪切强度公式中的理论条件假定不一致。将这些公式计算结果与试验结果进行对比,结果表明:新公式更精确。 相似文献
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《建筑钢结构进展》2020,(3):67-75
设计了扭转试验装置,对T形截面波纹腹板H形钢组合梁进行了扭转性能试验,研究波纹腹板H形钢组合梁在扭转作用下的扭矩-扭率特征曲线、各组成部分的应变发展及分布规律、混凝土翼板裂缝的发展与分布规律以及组合梁的受扭破坏形态。研究表明:由于波纹腹板具有褶皱效应,且其上、下部所受混凝土翼板与下翼缘的约束强弱不同,导致上、下部波纹腹板的变形不一致,在截面高度范围内剪应变分布不均匀,这与平钢腹板组合梁腹板剪应变分布均匀明显不同;波纹腹板容易发生翘曲变形,但翘曲应变较小;混凝土翼板裂缝小于45°,与钢筋混凝土构件受扭接近45°显著不同;通过理论分析推导出波纹腹板H形钢组合梁弹性抗扭刚度的计算公式,并与试验结果进行了对比。 相似文献
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与平腹板钢梁相比,梯形波纹腹板钢梁腹板局部剪切屈曲性能有所提高。弹性局部剪切屈曲是梯形波纹腹板钢梁设计计算基础,本文运用ANSYS有限元计算分析梯形波纹腹板钢梁弹性局部剪切屈曲,并与经典公式进行计算对比,发现经典公式计算值与ANSYS有限元计算结果存在较大偏差。由于存在"手风琴效应",腹板承担的弯矩相对较小,以致在腹板局部剪切屈曲计算中通常被忽视,这种方法是否适用于所有梯形波纹腹板钢梁及其所造成的计算偏差值得研究。本文从荷载条件、波折角大小、腹板尺寸以及翼缘尺寸等方面对影响梯形波纹腹板弹性局部剪切屈曲的因素进行计算分析。分析表明,上述影响因素与腹板弯矩相关,而腹板弯矩的存在将影响腹板弹性局部剪切屈曲。 相似文献
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波纹腹板H型钢能以较薄的钢板获得较高的抗剪屈曲能力,从而可以大量节约钢材。但传统的H型钢梁柱刚接节点的构造形式不适用于波纹腹板H型钢梁,为此提出了2种构造形式的波纹腹板H型钢梁柱刚接节点的构造形式。通过静力试验考察这2种节点的承载力以及各截面的内力分布,并对比了试验结果与有限元分析结果及实用设计公式的计算结果,验证了有限元分析的合理性以及实用设计公式的可靠性。使用有限元分析软件ABAQUS对节点进行了参数分析,研究了端板厚度、连接板厚度与波纹断点对节点承载力的影响。 相似文献
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This paper presents the shear buckling strength and design of curved corrugated steel webs for bridges considering material inelasticity. The inelastic buckling strength is determined from buckling curves based on the proposed shear buckling parameter, which is a function of the elastic shear buckling strength of steel web and the material shear yielding strength. A finite element analysis is carried out to study the geometric parameters affecting the shear buckling strength of curved corrugated steel webs for bridges. Based on the numerical results, a shear buckling parameter formula is proposed with no need to calculate either local, global, or interactive buckling parameters. But it depends on the geometric properties of the curved corrugated web profile. Another formula is presented to maximize the shear buckling capacity of curved corrugated web. The proposed formulae agreed well with the published experimental data. The curved corrugated webs produce a tremendous increase in the shear buckling strength and considerable weight saving in regard to the corresponding trapezoidal corrugated webs. The corrugation angle has a considerable effect on the behavior of curved corrugated webs, where higher corrugation angles produce a tremendous increase in the shear buckling strength of curved corrugated webs. It was found that the proposed approach provides a good prediction for the shear buckling strength of curved corrugated steel webs of bridges. 相似文献
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波折钢腹板相对于平直钢腹板具有优异的抗屈曲性能和良好的局部稳定性.利用ANSYS有限元软件分别建立了波折腹板H形截面梁和平直腹板H形截面梁的有限元模型,通过对比总结分析两种梁在轴压力、弯矩和剪力作用下的截面应力分布情况的差异,得出波折腹板H形截面梁在轴压力和弯矩作用下由翼缘承担大部分荷载,在剪力作用下由腹板承担大部分荷载.得到的结果可以为相关结构设计提供一定的参考. 相似文献
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波纹腹板H型钢梁柱铰接节点静力性能试验研究及有限元分析 总被引:2,自引:0,他引:2
通过对2个波纹腹板H型钢梁柱铰接节点的静力试验,分析了波纹腹板H型钢梁柱铰接节点的静力承载能力,研究了波纹腹板H型钢梁柱铰接节点各截面的内力分布,并将试验结果与传统H型钢梁柱铰接节点设计公式的计算结果进行了对比,验证了传统H型钢梁柱铰接节点设计公式的可靠性。采用有限元分析软件ABAQUS对节点进行了有限元分析,将有限元分析得到的荷载-位移曲线与试验结果进行对比,验证了有限元分析的合理性。采用ABAQUS对节点进行了参数分析,研究了端板厚度、梁连接板、柱连接板厚度与波纹断点对节点承载力的影响。研究结果表明:现有的H型钢梁柱铰接节点实用设计公式在设计波纹腹板H型钢梁柱铰接节点时安全可靠;常用的端板和连接板构造方式适用于波纹腹板H型钢梁柱铰接节点;腹板与端板焊接处波纹的断点不影响波纹腹板H型钢梁柱铰接节点的力学性能。 相似文献
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Nowadays, steel coupling beams are used as an efficient alternative to reinforced concrete (RC) coupling beams. Particularly in the coupled shear walls system, coupling beams are the main members for dissipating seismic energy. In this paper, for the first time the application of corrugated plates as the web of steel coupling beams (rather than flat web and its stiffeners) is studied as a proposition for improving seismic behavior of such beams. The study addresses the linear elastic buckling analysis and non-linear analysis of steel coupling beams with flat and corrugated webs using finite element technique for which ANSYS software is employed. 160 models have been studied, considering parameters such as shape of web plate (flat and three corrugated types, including trapezoidal, curved, and zigzag), web thickness, number of corrugations, and corrugation angle. The finite element results are validated through comparison with the experimental results of a common steel coupling beam, tested by other researchers. In addition to the advantages of eliminating web stiffeners, results of this study show that the application of corrugated web with the proposed geometric criteria makes it possible to achieve further rotation capacity in comparison with common steel coupling beams. Finally, a design approach for corrugated web of steel coupling beams, accompanied by a practical example, is presented. 相似文献
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对波形钢腹板-钢管混凝土翼缘组合梁进行了多点约束界面连接及多尺度有限元建模,通过计算分析和理论公式对比,验证了疲劳寿命预测精度和计算分析效率。采用多尺度模型对波形钢腹板钢管翼缘连接部位应力特性进行了分析,比较了波形角以及波形转角曲率半径与波形高度比值对连接部位应力特性的影响。结果表明:采用多尺度模型可在不影响疲劳寿命预测精度的前提下,较为有效地提高波形钢腹板 钢管组合梁疲劳分析的计算效率,其计算分析时间比精细化模型可节约28.9%,而寿命预测相对误差可控制在2%以内;对于梁结构建模,采用多尺度模型计算分析时间比精细化模型可节约40.7%,而寿命预测相对误差可控制在5%以内;多尺度模型模拟连接部位主应力分布规律与精细化模型一致,最大主应力值相对误差在5%以内;该方法可较好地实现对波形钢腹板与钢管混凝土翼缘连接部位不利应力状态的模拟,可为波形钢腹板 钢管混凝土翼缘组合梁的相关疲劳损伤分析提供参考。 相似文献
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工字钢与波折腹板H型钢梁的有限元分析 总被引:1,自引:0,他引:1
本文采用有限元的分析方法,分别建立了实腹式工字钢梁和波折腹板H型钢梁的有限元模型。通过有限元分析对比,说明了普通工字钢梁与波折腹板H型钢梁的承载力、变形曲线的差异。分析结果表明,在钢梁上翼缘(受压区翼缘)无可靠约束时,盲目采用波折腹板H型钢梁可能会带来一定的安全隐患,在实际工程设计时应予以注意。 相似文献
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Fatigue strength evaluation of welded structural details is of practical significance in the design of corrugated steel web girders in highway bridges and industrial structures. In this paper, the fatigue strengths of corrugated steel web girders with several welded structural details and welding methods are analytically examined by fatigue tests of corrugated web beams and small-size welded joints. The stress concentration & distribution characteristics of corrugated web beams were analysed using finite element analysis. The beam test results showed that the structure with scallops or notches in the flange has lower fatigue strength and that with butt joints is prone to suffer from shear crack on the corrugated web. Within the inside range of the scallop, the stress concentration becomes greater with the increase of scallop radius and the tension flange contributes significantly to the bending capacity of corrugated steel web beams. The tests for small-size welded joints indicated their applicability in the analysis and prediction of S-N relationship of the test corrugated steel web beams. Finally, the fatigue crack propagation lives of weld joints were compared with those of test corrugated steel web beams with respect to related design Categories of the AASHTO LRFD Bridge Design Specifications. 相似文献
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《Thin》2012
A three dimensional finite element model of PC box-girder with corrugated steel webs taking material nonlinearity into consideration is established to investigate the behavior under pure torsion. The torque–twist curves and ultimate torsional strength predicted by FEM show good agreement with test data. Results obtained from finite element model indicate that specimens go through three stages subjected to pure torsion and the shear flow in concrete top or bottom flange is not equal to that in corrugated steel webs. Parametric study is carried out including effect of corrugation, effect of thickness of web, effect of strength of concrete, and effect of prestressed tendons. It is shown that the ultimate torsional strength of specimens is in linear proportion to shear modulus and thickness of corrugated steel webs and to compressive strength of concrete. 相似文献