地震作用下相邻建筑结构碰撞反应分析
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摘要
地震作用下,相邻建筑结构由于不同动力特性的差异,并且没有足够的间距,容易遭受碰撞破坏。相邻结构间的碰撞作用是导致结构破坏甚至倒塌的重要原因之一。将相邻结构简化为多自由度楼层处碰撞模型,采用简化的Hertz-Damp模型,以相邻15层与8层钢筋混凝土框架结构为例,研究结构在地震作用下的碰撞反应,分析两相邻结构间不设置防震缝及按规范设置防震缝时,在不同加速度峰值情况下,碰撞作用对结构层间位移角和层间剪力的影响。研究表明,碰撞作用显著放大较高结构碰撞层及以上楼层的层间位移角和剪力,对较低结构具有总体抑制作用,但对顶层可能会产生不利影响;按规范设置防震缝时,7度设防结构在遭受7度罕遇地震时无碰撞发生,但遭遇8度和9度罕遇地震时发生碰撞,碰撞作用对结构反映的抑制作用比结构间无防震缝时明显降低。
Earthquake-induced structural pounding may result in considerable damage or even lead to collapse of colliding structures during severe ground motions if the separation between two buildings is not enough.The adjacent 15-storey and 8-storey structures are considered as Multi-Degree of Freedom(MDF) structural system.A simplified Hertz-damped model is adopted to analyze the pounding-involved response under ground motions with different peak acceleration.The different collision responses of structures with and without seismic joint are discussed.It concludes that pounding can increase the responses of the 15-storey structure and decrease the response of the 8-storey structure,but can be harmful to the top storey of the low building.The adjacent structures with seismic joint set in accordance with seismic code may not collide under the frequent earthquake,but the collision may happen under the severe earthquake and the pounding response may be less restrained than that in the case of without seismic joint.
Earthquake-induced structural pounding may result in considerable damage or even lead to collapse of colliding structures during severe ground motions if the separation between two buildings is not enough.The adjacent 15-storey and 8-storey structures are considered as Multi-Degree of Freedom(MDF) structural system.A simplified Hertz-damped model is adopted to analyze the pounding-involved response under ground motions with different peak acceleration.The different collision responses of structures with and without seismic joint are discussed.It concludes that pounding can increase the responses of the 15-storey structure and decrease the response of the 8-storey structure,but can be harmful to the top storey of the low building.The adjacent structures with seismic joint set in accordance with seismic code may not collide under the frequent earthquake,but the collision may happen under the severe earthquake and the pounding response may be less restrained than that in the case of without seismic joint.
引文
[1]邹宏德,蓝宗建.相邻建筑结构碰撞问题的探讨[J].工业建筑,2002,32(4):49-52(Zou Hongde,Lan Zongjian.Discussion on structural collision between adjacent buildings[J].Industrial Construction,2002,32(4):49-52(in Chinese))
[2]Kasai K,Maison B F.Dynamics of pounding when two buildings collide[J].Earthquake Engineering and Structural Dynamics,1992,21:771-786
[3]Anagnostopoulos A,Spiliopoulos K V.An investigation of earthquake induced pounding between adjacent building[J].Earthquake Engineering and Structural Dynamics,1992,21:289-302
[4]Karayannis C G,Favvata M J.Earthquake-induced interaction between adjacent reinforced concrete structures with non-equal heights[J].Earthquake Engineering and Structural Dynamics,2005,34:1-20
[5]Papadrakakis M.Three dimensional simulation of structuralpounding during earthquakes[J].Joumal of Engineering Mechanics,1996,122(5):423-431
[6]Jankowski R.Earthquake-induced pounding between equal height buildings withsubstantially different dynamic properties[J].Engineering Structures,2008,30:2818-2829
[2]Kasai K,Maison B F.Dynamics of pounding when two buildings collide[J].Earthquake Engineering and Structural Dynamics,1992,21:771-786
[3]Anagnostopoulos A,Spiliopoulos K V.An investigation of earthquake induced pounding between adjacent building[J].Earthquake Engineering and Structural Dynamics,1992,21:289-302
[4]Karayannis C G,Favvata M J.Earthquake-induced interaction between adjacent reinforced concrete structures with non-equal heights[J].Earthquake Engineering and Structural Dynamics,2005,34:1-20
[5]Papadrakakis M.Three dimensional simulation of structuralpounding during earthquakes[J].Joumal of Engineering Mechanics,1996,122(5):423-431
[6]Jankowski R.Earthquake-induced pounding between equal height buildings withsubstantially different dynamic properties[J].Engineering Structures,2008,30:2818-2829
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