基于Pushover分析的CFRP网架失效模式及其控制方法
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摘要
空间结构正在向着超大跨度发展,结构自重是限制其实现这种跨越能力的重要因素。碳纤维复合材料(CFRP)具有轻质高强的特点,为这一问题的解决提供了有效的途径。以空间结构中最普遍采用的平板网架为研究对象,采用Pushover分析方法,对CFRP平板网架的抗震能力、失效破坏模式及其控制方法进行了研究。首先,研究了CFRP网架竖向多模态Pushover分析方法;其后,以一个100m跨度正放四角锥CFRP网架为例,研究了考虑支座情况下CFRP网架在单向水平、双向水平、竖向及三向等荷载情况作用下的失效准则、失效模式及其控制方法。分析结果表明,CFRP网架支座的建模方法对网架的Pushover分析结果有很大影响。在水平地震荷载及三向地震荷载作用下,控制CFRP网架失效的关键条件是网架支座水平位移不超过其位移限值。
The self-weight and its induced internal force of a long span space structure remarkably increase with increasing span,thus the spanning ability of these structures is limited.This problem can be solved by using carbon fiber reinforced plastic(CFRP)instead of conventional steel in construction of long span space structures.Thus in this paper,space structure is proposed to be constructed fully by CFRP.The seismic capacity,failure mode of the structure under strong earthquakes and its control method of CFRP grid are investigated based on the pushover analysis.First,the pushover analysis method for the CFRP grid under vertical load and considering multi-mode is addressed.After that,a square pyramid space grid is utilized to address the failure criteria,failure mode and its control method of the CFRP grid under four types of loads,i.e.one directional horizontal load,two directional horizontal load,vertical load and three directional load.The analysis results indicate that the failure modes of CFRP grid are affected by the method modeling the bearings of the grid.The key criteria controlling failure mode of CFRP grid under limit earthquakes is that keeping the horizontal displacement of the grid smaller than the horizontal displacement limit of the bearing.
The self-weight and its induced internal force of a long span space structure remarkably increase with increasing span,thus the spanning ability of these structures is limited.This problem can be solved by using carbon fiber reinforced plastic(CFRP)instead of conventional steel in construction of long span space structures.Thus in this paper,space structure is proposed to be constructed fully by CFRP.The seismic capacity,failure mode of the structure under strong earthquakes and its control method of CFRP grid are investigated based on the pushover analysis.First,the pushover analysis method for the CFRP grid under vertical load and considering multi-mode is addressed.After that,a square pyramid space grid is utilized to address the failure criteria,failure mode and its control method of the CFRP grid under four types of loads,i.e.one directional horizontal load,two directional horizontal load,vertical load and three directional load.The analysis results indicate that the failure modes of CFRP grid are affected by the method modeling the bearings of the grid.The key criteria controlling failure mode of CFRP grid under limit earthquakes is that keeping the horizontal displacement of the grid smaller than the horizontal displacement limit of the bearing.
引文
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[2]侯爽,欧进萍.结构Pushover分析的侧向力分布及高阶振型影响[J].地震工程与工程振动,2004,24(3):89-97.Hou Shuang,Ou Jinpin.Astudy of load pattern selection of pushover analysis and influence of higher modes[J].Journal of Earthquake Engineer-ing and Engineering Vibration,2004,24(3):89-97.
[3]佘师和.竖向地震反应谱[J].哈尔滨建筑工程学院学报,1982,(2):26-39.She Shihe.Response spectrum of vertical seismic waves[J].Journal of Harbin University of Civil Engineering and Architecture,1982,(2):26-39.
[4]张亮泉,李惠,欧进萍.纤维缠绕CFRP圆管力学性能的试验及数值模拟研究[J].土木工程学报,2009,42(8):50-56.Zhang Liangquan,Li Hui,Ou Jinping.Experimental and numerical study on mechanical properties of filament-wound CFRP Tubes[J].China Civil Engineering Journal,2009,42(8):50-56.
[5]严慧,董石麟.板式橡胶支座节点的设计与应用研究[J].空间结构,1995,1(2):33-40.Yan Hui,Dong Shilin.Design and application research of plate-type supporting Joints[J].Space Structure,1995,1(2):33-40.
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