连柱钢框架结构动力反应分析

发布时间：2018-07-16 14:17

【摘要】：连柱钢框架结构是通过耗能连梁连接钢框架结构的毗邻双柱构成,地震作用下连梁首先屈服耗散地震能量,避免或延缓主体结构的损伤,该结构与支撑框架机构相比可提供更大的自由空间。目前国内外对连柱钢框架结构的动力性能分析较少,没有完全明确结构功能快速恢复的使用范围,未提出连柱钢框架结构耗能连梁可替换的层间位移角范围,对连柱钢框架结构的结构影响系数及位移放大系数的研究较少。鉴于此,本文分析了连柱钢框架的动力性能、耗能连梁可替换层间位移角的范围、结构的影响系数及位移放大系数。(1)对连柱框架结构进行动力分析表明:在多遇、设防及罕遇地震作用下,LCF结构耗能连梁转角、层间位移角随结构跨度的增加而增大,层剪力分布与结构跨度无明显关联。在多遇、设防及罕遇地震作用下,耗能连梁转角随结构层高的增加无明显变化,层剪力分布随结构层高的增加而增大。在设防及罕遇地震作用下,LCF结构的层间位移角随结构层高的增加而增大。在多遇、设防及罕遇地震作用下,LCF结构耗能连梁转角、层间位移角、层剪力分布系数随结构层数的增加而增大。各算例地震作用越强,层剪力分布越均匀。(2)分析不同高跨比,层数及钢材强度等级等参数对连柱钢框架结构的快速恢复使用功能的影响。确定耗能连梁可替换层间位移角的合理范围。连柱钢框架耗能连梁的可替换范围与高跨比无明显关系,随层数的增加而增大,随钢材强度等级的增加而增大。(3)采用改进的能力谱法确定连柱钢框架结构的结构影响系数及位移放大系数。高跨比对结构影响系数的影响程度较小,层数越多结构影响系数越大;位移放大系数dC随跨度的增加而减小,与层高的影响程度较小,随层数的增加而减小。
[Abstract]:The continuous column steel frame structure is composed of two columns adjacent to the steel frame structure connected by energy dissipation beam. Under earthquake, the connecting beam first yields and dissipates seismic energy to avoid or delay the damage of the main structure. Compared with the braced frame mechanism, the structure can provide more free space. At present, there is little analysis on the dynamic performance of the steel frame structure at home and abroad, and the range of interstory displacement angle which can be replaced by the energy dissipation connecting beam of the steel frame structure is not put forward. The influence coefficient and displacement magnification factor of continuous column steel frame structure are seldom studied. In view of this, this paper analyzes the dynamic performance of continuous column steel frame, the range of interstory displacement angle of energy dissipation beam, the influence coefficient of structure and displacement magnification factor. (1) the dynamic analysis of continuous column frame structure shows that: in most cases, Under the action of fortification and rare earthquake, the rotation angle of energy dissipation connecting beam of LCF structure increases with the increase of span of structure, but the distribution of story shear force has no obvious relation with the span of structure. Under the action of frequent, fortification and rare earthquakes, the rotation angle of energy dissipation beam does not change obviously with the increase of the height of the structure, but the shear distribution of the layer increases with the increase of the height of the structure. The interstory displacement angle of LCF structure increases with the increase of structure height under the action of fortification and rare earthquake. Under the action of frequent, fortification and rare earthquakes, the energy dissipation connecting beam rotation angle, the interstory displacement angle and the shear distribution coefficient of the LCF structure increase with the increase of the number of layers of the structure. The stronger the seismic action of each example, the more uniform the layer shear distribution. (2) the influence of different height / span ratio, the number of layers and the grade of steel strength on the rapid recovery function of the continuous column steel frame structure is analyzed. Determine the reasonable range of the displacement angle between the replaceable floors of the energy dissipation beam. There is no obvious relation between the replacement range of energy dissipation connecting beam and the ratio of height to span of continuous column steel frame, but it increases with the increase of the number of layers. (3) the structural influence coefficient and displacement magnification factor of the steel frame structure are determined by the improved capacity spectrum method. The influence of height to span ratio on the influence coefficient of the structure is smaller, and the influence coefficient of the structure with more stories is greater, and the displacement magnification coefficient dC decreases with the increase of span, and with the increase of story height, the influence degree of the displacement magnification coefficient decreases with the increase of the number of stories.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391

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