加腋钢框架结构的静力弹塑性性能研究
发布时间：2018-11-27 18:04
【摘要】：美国北岭和日本阪神地震后,为避免传统钢框架梁柱连接节点焊缝处过早的产生脆性破坏,人们提出了加强型和削弱型两类新型钢结构梁柱连接,它们的本质都是迫使塑性铰出现远离柱表面的梁上。本文中的加腋节点是加强型节点中的一种。国内只是单独的对加腋型梁柱节点进行地震响应对比和内部应力状态的研究,而对整个框架加腋后的力学性能研究较少。 本文运用SAP2000程序对普通钢框架和对其进行加腋后的框架进行模态分析和Pushover分析。模态分析得出两类钢框架的周期。Pushover分析得出两类钢框架在多遇和罕遇地震作用下性能点的基底剪力和顶点位移,然后分别以第一次Pushover分析得到的顶点位移为监测位移再进行Pushover分析,得到多遇和罕遇地震作用下两类钢框架的层位移、层间位移角和各杆件的塑性铰数量及塑性铰出现的顺序。分析 结果表明： 加腋措施使得钢框架在单位质量下的振型刚度发生变化,从而影响振型周期； 加腋措施使得钢框架在多遇和罕遇地震下的层位移有减小的趋势； 加腋措施使得钢框架在多遇地震下的层间位移角减小的趋势,而在罕遇地震下的层间位移角有增大的趋势,但是这两种影响的幅度不大； 加腋措施显著改善了钢框架在罕遇地震下结构杆件的塑性铰数量和塑性铰出现的顺序,但是加腋后的首层柱底达到C阶段,为薄弱构件,加腋设计时需要加强。
[Abstract]:In order to avoid premature brittle failure at the weld joint of the traditional steel frame Liang Zhu connection after the earthquake in North Ridge and Hanshin, Japan, two new types of strengthened and weakened steel structures Liang Zhu connection were proposed. Their essence is to force plastic hinges to appear on beams far from the surface of the column. The axillary node in this paper is one of the enhanced nodes. In China, the seismic response and internal stress state of Liang Zhu joints with axillary type are studied separately, but the mechanical properties of the whole frame after adding axillary are less studied. In this paper, the modal analysis and Pushover analysis of the ordinary steel frame and the post-axillary frame are carried out by using SAP2000 program. The period of two kinds of steel frames is obtained by modal analysis. Pushover analysis shows the base shear force and vertex displacement of the two kinds of steel frames under rare and rare earthquakes. Then, using the vertex displacement obtained from the first Pushover analysis as the monitoring displacement, the Pushover analysis is carried out, and the floor displacement, interstory displacement angle, the number of plastic hinges of each member and the order in which plastic hinges appear are obtained under the action of frequent and rare earthquakes. The results show that the vibration stiffness of steel frame under unit mass is changed by adding axillary measures, which affects the mode period. The addition of axillary measures makes the floor displacement of steel frame decrease under frequent and rare earthquakes. The addition of axillary measures makes the interstory displacement angle of the steel frame decrease under frequent earthquakes, while the interstory displacement angle increases under rare earthquakes, but the amplitude of these two kinds of effects is not significant. The addition of axil significantly improves the number of plastic hinges and the emergence order of plastic hinges in steel frames under rare earthquakes, but the bottom of the column with the first layer after the axil reaches the C stage, which is a weak member and needs to be strengthened in the design of axil.
【学位授予单位】：内蒙古工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391;TU313
本文编号：2361619
[Abstract]:In order to avoid premature brittle failure at the weld joint of the traditional steel frame Liang Zhu connection after the earthquake in North Ridge and Hanshin, Japan, two new types of strengthened and weakened steel structures Liang Zhu connection were proposed. Their essence is to force plastic hinges to appear on beams far from the surface of the column. The axillary node in this paper is one of the enhanced nodes. In China, the seismic response and internal stress state of Liang Zhu joints with axillary type are studied separately, but the mechanical properties of the whole frame after adding axillary are less studied. In this paper, the modal analysis and Pushover analysis of the ordinary steel frame and the post-axillary frame are carried out by using SAP2000 program. The period of two kinds of steel frames is obtained by modal analysis. Pushover analysis shows the base shear force and vertex displacement of the two kinds of steel frames under rare and rare earthquakes. Then, using the vertex displacement obtained from the first Pushover analysis as the monitoring displacement, the Pushover analysis is carried out, and the floor displacement, interstory displacement angle, the number of plastic hinges of each member and the order in which plastic hinges appear are obtained under the action of frequent and rare earthquakes. The results show that the vibration stiffness of steel frame under unit mass is changed by adding axillary measures, which affects the mode period. The addition of axillary measures makes the floor displacement of steel frame decrease under frequent and rare earthquakes. The addition of axillary measures makes the interstory displacement angle of the steel frame decrease under frequent earthquakes, while the interstory displacement angle increases under rare earthquakes, but the amplitude of these two kinds of effects is not significant. The addition of axil significantly improves the number of plastic hinges and the emergence order of plastic hinges in steel frames under rare earthquakes, but the bottom of the column with the first layer after the axil reaches the C stage, which is a weak member and needs to be strengthened in the design of axil.
【学位授予单位】：内蒙古工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391;TU313
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