结构近场地震作用及人字形中心支撑钢框架近场地震反应分析

发布时间：2018-01-12 18:33

本文关键词：结构近场地震作用及人字形中心支撑钢框架近场地震反应分析　出处：《苏州科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：相关文献表明,近年来的强震中损毁严重的结构主要位于近断层区(极震区),即紧邻震中带附近。近断层区的地面运动带有长周期速度脉冲,近场地面运动的速度和位移峰值均远高于远场地面运动,对结构提出了更高要求。相对而言,各国学者针对中远场地面运动特性及结构抗震设计方法的研究已比较成熟和完善,但对近场地面运动特性及近断层区结构抗震设计方法的研究尚不够成熟和完善,有必要对近断层区结构抗震设计方法进行深入研究。本文按照《建筑抗震设计规范》GB50011-2010,对处于发震断裂两侧5km以内结构采用近场地震作用放大系数1.5,分别设计了10、15、20层人字形中心支撑钢框架；选取了16条近场地震记录,采用Pushover方法和弹塑性时程方法分析了所设计结构在近场地震波作用下的反应；分析了结构损伤、结构位移响应、结构剪力和耗能构件支撑杆的弹塑性反应；评价了《建筑抗震设计规范》GB50011-2010近场地震作用放大系数方法的合理性。弹塑性时程分析结果表明：近场多遇地震下3个结构的层间位移角基本满足规范要求,但在近场设防和罕遇地震下结构均出现较大变形,不满足规范层间侧移限值要求；地震加速度峰值、结构层数、近场地震动的频谱特性以及不同的脉冲效应均对结构反应产生一定的影响。
[Abstract]:The related literatures show that the structures damaged seriously in recent strong earthquakes are mainly located in the near fault area (near the epicenter zone or near the epicentral zone.) the ground motion in the near fault area has long period velocity pulse. The velocity and displacement peak of near-field ground motion is much higher than that of far-field ground motion, which puts forward higher requirements for the structure. The research on the characteristics of ground motion and seismic design of structures in the far and middle field has been mature and perfect by scholars all over the world. However, the study of near-field ground motion characteristics and seismic design method of near-fault structure is not mature and perfect. It is necessary to study the seismic design method of structures near faults. According to the Code for Seismic Design of buildings (GB50011-2010). The near-field seismic magnification factor 1.5 is adopted for the structures within 5 km of both sides of the seismogenic fault, and the 10101520 story herringbone central braced steel frame is designed respectively. Sixteen near-field seismic records are selected and the responses of the designed structures to near-field seismic waves are analyzed by using Pushover method and elastic-plastic time-history method. The elastic-plastic responses of structural damage, structural displacement response, structural shear and energy dissipation members are analyzed. The rationality of GB50011-2010 near field seismic magnification factor method is evaluated. The results of elastic-plastic time-history analysis show that:. The interstory displacement angles of three structures under near-field frequent earthquakes basically meet the requirements of the code. However, under the near-field fortification and rare earthquakes, the structure has a large deformation, which does not meet the limit requirement of the lateral displacement between the code layers. The peak value of seismic acceleration, the number of structure layers, the spectral characteristics of near-field ground motion and the different pulse effects all have certain effects on the structural response.
【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】：TU311.3;TU391

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