火电厂钢框排架-支撑结构抗震性能试验研究

发布时间：2018-06-10 13:56

本文选题：框排架 + 火电厂　；参考：《土木工程学报》2017年11期

【摘要】：为研究我国高烈度大容量机组火力发电厂钢框排架-支撑结构的抗震性能,以某典型火电厂主厂房为实例,选取横向某榀结构为研究单元,设计1∶10比例模型,进行了有侧限低周往复加载试验。根据试验现象和所获滞回曲线、骨架曲线、刚度退化曲线、位移延性和等效黏滞阻尼系数等综合评价结构的抗震性能。研究结果表明:钢框排架-支撑模型结构的荷载-位移曲线饱满,结构延性和耗能能力较好,具有良好的抗震能力;结构底部支撑为最初破坏部位,塑性铰发展顺序为先梁端后柱端,最终框架柱呈压弯变形,排架柱呈弯扭变形;框架平面内加载下结构正向最大承载力比反向偏大11.3%,存在不对称性;结构第2层层间位移角达到1/22,为薄弱层所在,设计中应予以加强。钢支撑受压屈曲是局部出现平面外变形、节点连接处变形和残余变形等问题的重要原因。
[Abstract]:In order to study the seismic behavior of steel frame bent bracing structure in high intensity and large capacity thermal power plants in China, taking a typical thermal power plant as an example, a transverse structure is selected as the research unit and a 1:10 scale model is designed. The low cycle reciprocating loading test with side limit was carried out. The seismic behavior of the structures is evaluated according to the experimental phenomena, the obtained hysteretic curves, the skeleton curves, the stiffness degradation curves, the displacement ductility and the equivalent viscous damping coefficient. The results show that the load-displacement curve of the steel frame bent bracing model structure is full, the ductility and energy dissipation capacity of the structure is good, and the structure bottom bracing is the initial failure position. The development order of plastic hinge is first beam end and back column end, finally frame column presents bending deformation, bent column presents bending and torsional deformation, and the maximum forward bearing capacity of the structure under in-plane loading is greater than that of reverse beam end, and there is asymmetry. The displacement angle between the second layer of the structure reaches 1 / 22, which is the weak layer, which should be strengthened in the design. Compressive buckling of steel braces is an important cause of local out-of-plane deformation, joint deformation and residual deformation.
【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;中冶建筑研究总院有限公司;北京电力工程公司;华北电力设计院工程有限公司;
【基金】：北京市自然科学基金重点项目(8141001) 国家自然科学基金面上项目(51378038)
【分类号】：TU352.11

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