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电厂脱硫设施结构为大直径薄壁钢高耸结构,受力较为复杂,参照《烟囱设计规范》(GB50051-2013)中相关计算方法进行分析时,难以对烟囱的自振周期、横风向风振影响、局部开孔应力集中等设计要点计算准确,本文通过对某烟囱及吸收塔进行有限元分析,根据分析结果对原有设计进行安全性校核,并提出优化设计建议,对类似设计有一定的参考价值。 相似文献
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大直径钢管混凝土的加固,存在着新旧混凝土结合,混凝土与钢管表面相结合共同受力的加固难题,通过有限元程序的辅助计算分析能够更好地揭示混凝土与钢管的相互作用。ANSYS中单元Solid65为型钢混凝土结构有限元数值模拟提供了基础,逐渐成为型钢混凝土结构理论研究和工程应用的常用工具软件。但是如何处理型钢和混凝土加载后的共同受力~([1])是一个有限元数值模拟的难点,如何准确的模拟二者的共同受力是有限元分析结果准确与否的关键。 相似文献
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传统单一圆筒型烟囱具有外观及实用性上的缺点,然而异型烟囱结构的研究资料却甚少。鉴于此,本文运用大型有限元计算软件ANSYS对一高耸异型钢筋混凝土烟囱结构建模并进行受力情况分析,同时给出了受控截面的配筋方案;为该类烟囱的设计及施工提供理论依据。 相似文献
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以引洮供水一期工程总干渠4号渡槽为工程背景,采用MIDAS有限元分析软件对扣件式钢管支架进行了有限元分析。分析结果表明,渡槽支架构件均满足强度和稳定要求,并具有足够的安全储备,对同类结构的设计与计算工作具有一定理论指导作用。 相似文献
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应用ANSYS通用程序,对轴压钢管混凝土格构柱进行了有限元参数分析。计算结果表明:除钢材强度、混凝土强度等级以外,钢管混凝土柱肢的含钢率对稳定系数的影响也不可忽略,相同换算长细比的钢管混凝土格构柱,柱肢的含钢率越大,稳定系数越小。借鉴国内钢结构设计规程,在理论推导和工程实例数值分析基础上,给出了综合考虑钢材强度、混凝土强度等级、含钢率的钢管混凝土格构柱稳定计算的材料修正系数γ的计算式,并提供了实用表格以方便查用。算例分析结果表明,材料修正系数γ的计算值与有限元计算结果吻合良好。 相似文献
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通过有限元方法对某工程实例中150m单筒式钢筋混凝土烟囱进行了内力、位移计算及非线性屈曲分析。同时,介绍了钢筋混凝土烟囱的屈曲形式及计算烟囱整体稳定下的临界荷载,得出了单筒式钢筋混凝土烟囱无需计算整体稳定的结论,加强了对烟囱设计规范的理解,为单筒式钢筋混凝土烟囱的设计提供参考。 相似文献
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国家标准《烟囱设计规范》GB50051-2002首次纳入了钢烟囱设计内容,对钢烟囱稳定计算也作出了相应的规定,但在非弹性屈曲情况下,其规定内容还不够完善。现将国内外关于圆柱壳局部屈曲计算规定进行归纳、分析和比较,并对各种计算方法进行评估,以确定钢烟囱局部稳定计算的依据。 相似文献
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PAN Hanming GUO Yanlin LIANG Shuo PEI Shengxing LIANG Weisheng WANG Lewen 《Frontiers of Structural and Civil Engineering》2008,2(2):123
Based on a blind spot in the current design standard of steel structures, the large diameter thin-walled tube beam-columns are analyzed using nonlinear finite element method in this paper. The influence of several factors on stability capacity of the large diameter thin-walled tube beam-columns is taken into account. Thus, according to the correlative design standard of steel structures, and on the basis of the numerical analytical results by the finite element methods, the calculation formulas of the stability bearing capacity are presented for beam-column members of the large diameter thin-walled tubes. Three tests of thin-walled steel tube beam-columns were reported. Test results for deformations and ultimate strength are found to be in a good agreement with the corresponding values predicted by the calculation formulas, and the proposed methods can be used in design practice. 相似文献
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Hanming Pan Yanlin Guo Shuo Liang Shengxing Pei Weisheng Liang Lewen Wang 《Frontiers of Architecture and Civil Engineering in China》2008,2(2):123-132
Based on a blind spot in the current design standard of steel structures, the large diameter thin-walled tube beam-columns
are analyzed using nonlinear finite element method in this paper. The influence of several factors on stability capacity of
the large diameter thin-walled tube beam-columns is taken into account. Thus, according to the correlative design standard
of steel structures, and on the basis of the numerical analytical results by the finite element methods, the calculation formulas
of the stability bearing capacity are presented for beam-column members of the large diameter thin-walled tubes. Three tests
of thin-walled steel tube beam-columns were reported. Test results for deformations and ultimate strength are found to be
in a good agreement with the corresponding values predicted by the calculation formulas, and the proposed methods can be used
in design practice.
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Translated from China Civil Engineering Journal, 2007, 40(3): 11–17 [译自: 土 木 工 程 学 报] 相似文献
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介绍了美国《建筑钢结构规范》(AISC-LRFD)和欧洲《钢-混凝土组合结构设计规范》(Eurocode 4)中关于钢管混凝土柱稳定系数的计算方法。无论钢管混凝土单肢柱或是钢管混凝土格构柱,均可先计算柱的相对长细比,再通过相应公式计算其稳定系数。采用该研究思路,在分析评价国内外各设计规程计算方法的基础上,提出适合工程应用的钢管混凝土柱稳定系数的统一算法。对钢管混凝土单肢柱、哑铃形柱、格构柱分别进行该算法的试验验证,研究结果表明,计算值与试验值均吻合良好。 相似文献
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Changdong Zhou Miaowang Tian Kunpeng Guo 《The Structural Design of Tall and Special Buildings》2019,28(1)
In order to identify the vulnerable parts and areas of the high‐rise reinforced concrete chimney, this paper presents an effective method, which called partitioned fragility analysis. One 240‐m‐high reinforced concrete chimney was selected as the practical project, and its analytical model was created with ABAQUS software. The selected high‐rise chimney structure was divided into 17 parts, and then the damage probability of each part in different damage states was obtained with the fragility analysis considering multidimensional ground motions. Twenty ground motion records were taken from the Next Generation Attenuation database as the input motions, and the peak ground acceleration was selected as the intensity measure. The response of the chimney structure under multidimensional ground motions was obtained based on incremental dynamic analysis. The maximum strains of concrete and steel bars were defined as the damage limit states of the chimney structure. The fragility curves and surfaces obtained from this analysis showed that the vulnerable areas of the chimney structure appear at 0–20 m, 90–130 m, and 150–200 m along the height of the chimney respectively. Based analytical results, these vulnerable parts can be retrofitted to enhance the seismic resistance of existing chimney structures. And the partitioned fragility analysis method can also be used to improve the design of new chimney structures. 相似文献
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在钢结构工程中经常采用等边或不等边单角钢作为轴心受压构件,现行钢结构设计规范(GB50017—2002)提供了等边单角钢压杆的截面类别及稳定计算方法,但对不等边单角钢压杆的规定相对粗糙。本文根据弹性稳定理论和角钢截面特征规律,推导了等边及不等边单角钢轴心受压构件的屈曲条件和长细比简化计算方法,并给出了稳定设计方法。扭转屈曲换算长细比仅与角钢肢宽与肢厚的比值有关,这使得弯扭屈曲换算长细比的计算也进一步简化。经过验证,该方法简单实用,可供工程设计参考。 相似文献