某锅炉钢架结构局部坍塌原因分析
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摘要
对某锅炉钢架局部坍塌事故展开调查和分析。理论计算和数值分析结果表明,省煤器支承结构承压式支座节点的设计缺陷是结构坍塌的主要原因,承压节点传力路径不合理,加劲构造不足,节点区箱梁腹板在局部压力和箱梁扭矩的作用下发生弹塑性屈曲失效。加固方案改变了节点的传力路径,使之以腹板抗剪为主,受力模式清晰,理论计算强度充足,数值分析也表明该方案安全合理。
The paper conducted the investigation and analysis on a local collapse of the steel frame in a boiler. The analytical calculation and numerical analysis confirmed that the design defect of the connection for the supporting structure of coal saving device was the major cause of the collapse. The connection which was mainly subjected to compression had an unreasonable force path,and the stiffening configuration was also insufficient. The web of the box girder at the connection exhibited elastic-plastic buckling failure under the local compression and the torsion of the box girder. The reinforcement design changed the force path of the connection so that the web mainly subjected to shear force. It had a clear force path and sufficient theoretical bearing capacity. In addition, the numerical analysis also confirmed that the reinforcement design was reasonable and safe.
The paper conducted the investigation and analysis on a local collapse of the steel frame in a boiler. The analytical calculation and numerical analysis confirmed that the design defect of the connection for the supporting structure of coal saving device was the major cause of the collapse. The connection which was mainly subjected to compression had an unreasonable force path,and the stiffening configuration was also insufficient. The web of the box girder at the connection exhibited elastic-plastic buckling failure under the local compression and the torsion of the box girder. The reinforcement design changed the force path of the connection so that the web mainly subjected to shear force. It had a clear force path and sufficient theoretical bearing capacity. In addition, the numerical analysis also confirmed that the reinforcement design was reasonable and safe.
引文
[1]秦权.发电锅炉钢架的抗震问题[J].工程抗震,1993(4):26-29.
[2]刘树新.振型分解反应谱法在锅炉钢架抗震计算中的应用[J].钢结构,2012,27(增刊):41-45.
[3]中国国家标准化管理委员会.锅炉钢结构设计规范:GB/T22395—2008[S].北京:中国标准出版社,2008.
[4]庄茁,张帆,岑松,等.ABAQUS非线性有限元分析与实例[M].北京:科学出版社,2005.
[5]陶慕轩,聂建国.面向体系非线性分析的钢管混凝土柱-组合梁节点多尺度高效数值模型[J].土木工程学报,2014,47(9):57-69.
[2]刘树新.振型分解反应谱法在锅炉钢架抗震计算中的应用[J].钢结构,2012,27(增刊):41-45.
[3]中国国家标准化管理委员会.锅炉钢结构设计规范:GB/T22395—2008[S].北京:中国标准出版社,2008.
[4]庄茁,张帆,岑松,等.ABAQUS非线性有限元分析与实例[M].北京:科学出版社,2005.
[5]陶慕轩,聂建国.面向体系非线性分析的钢管混凝土柱-组合梁节点多尺度高效数值模型[J].土木工程学报,2014,47(9):57-69.