| 边界条件对平板网架结构抗火性能的影响 |
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| 引用本文： | 蒋舒,杜咏,胡夏闽. 边界条件对平板网架结构抗火性能的影响[J]. 建筑钢结构进展, 2011, 13(4) |
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| 作者姓名： | 蒋舒 杜咏 胡夏闽 |
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| 作者单位： | 1. 南京工业大学,土木工程学院,南京,210009
2. 南京工业大学,土木工程学院,南京,210009;南京工业大学,建筑与城市规划学院,南京,210009 |
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| 摘 要： | 在正放四角锥网架结构抗火性能研究的基础上,进一步分析了两向正交正放网架、斜放四角锥网架和正放抽空四角锥网架在大空间建筑火灾中的热力耦合反应。基于有限元程序ANSYS建立了网架结构上弦压杆应力比一致的结构分析模型,按温度增量加载的方法,对不同支座布置、温度场及荷载条件下的网架结构全过程反应进行了分析。结果表明,温度场非均匀性是导致网架结构杆件相互约束的主要因素,随着温度场非均匀性系数η的减小,各型网架结构的临界温度呈下降的趋势;在相同的温度场和支座布置条件下,随着荷载比的减小各型网架结构临界温度呈升高趋势;根据不同类型网架的传力特点,释放网架结构在主要传力方向的约束,可以提高网架结构的抗火承载力。上述边界条件对网架结构抗火性能的影响规律,为确定网架结构抗火性能关键参数分析方案提供了理论依据。
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| 关 键 词： | 网架结构 边界条件 热力耦合效应 临界温度 |
Effects of Boundary Conditions on Fire-Resistance of Space Trusses |
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| JIANG Shu,DU Yong,HU Xia-min. Effects of Boundary Conditions on Fire-Resistance of Space Trusses[J]. Progress in Steel Building Structures, 2011, 13(4) |
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| Authors: | JIANG Shu DU Yong HU Xia-min |
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| Affiliation: | JIANG Shu1,DU Yong1,2,HU Xia-min1(1.School of Civil Engineering,Nanjing University of Technology,Nanjing 210009,China,2.School of Architecture and Urban Planning,China) |
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| Abstract: | Analysis of thermo-mechanical coupling effects is moving from regular pyramidic space trusses towards two-way orthogonal space trusses,diagonal square pyramidic space trusses and orthogonal extracted pyramidic space trusses.Based on finite element software ANSYS a series of space truss models with the same bearing capacity level of upper chord members were developed for analysis of the whole structural response of space trusses by step-by-step method throughout the whole temperature history.The finite eleme... |
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| Keywords: | space truss boundary condition thermo-mechanical coupling effect critical temperature |
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