地震作用下高架桥梁碰撞应力波测量与分析
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摘要
地震作用下高架桥梁相邻主梁之间、主梁与墩台以及主梁与挡块之间会由于相对位移过大而发生碰撞。碰撞不仅会使结构内力增加而引发损伤,还会由于冲击作用产生应力波。碰撞应力波会加剧结构的损伤,也会对桥梁碰撞试验的数据采集例如加速度信号造成影响。本文基于声发射传感器构建了桥梁碰撞应力波采集系统,并通过振动台试验采集得到了碰撞应力波信息,结合波动理论,分析了应力波的特性和传播规律;利用时频分析理论,研究了桥梁不同位置处碰撞应力波的时频特性和应力波能量分布规律。
Structural pounding may occur between adjacent decks,deck and abutment or blocks of highway bridges under strong earthquakes. Pounding could not only result in the increase of structural internal force,but also generate stress waves. Pounding stress wave will increase the structural damage,and also has effect on the data acquisition system such as acceleration signals. This study focuses on the acquisition system of pounding stress wave based on the Acoustic Emission( AE) sensors. The stress wave signals are obtained through shaking table test of highway bridges. Then,the properties and propagation of the stress wave are investigated based on wave theory. The correlation analysis of pounding waveforms of bridge is carried out according to the time-frequency analysis methods. Finally,the energy distribution of pounding stress waves in the highway bridge are analyzed.
Structural pounding may occur between adjacent decks,deck and abutment or blocks of highway bridges under strong earthquakes. Pounding could not only result in the increase of structural internal force,but also generate stress waves. Pounding stress wave will increase the structural damage,and also has effect on the data acquisition system such as acceleration signals. This study focuses on the acquisition system of pounding stress wave based on the Acoustic Emission( AE) sensors. The stress wave signals are obtained through shaking table test of highway bridges. Then,the properties and propagation of the stress wave are investigated based on wave theory. The correlation analysis of pounding waveforms of bridge is carried out according to the time-frequency analysis methods. Finally,the energy distribution of pounding stress waves in the highway bridge are analyzed.
引文
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[5]Masroor A,Mosqueda G.Experimental simulation of base-isolated buildings pounding against moat wall and effects on superstructure response[J].Earthquake Engineering and Structural Dynamics,2002,41:2093-2109.
[6]吴斌,韩强,李忱.结构中的应力波[M].北京:科学技术出版社,2001.WU Bin,HAN Qiang,LI Chen.Stress waves in structures[M].Beijing:Science Press,2001.(in Chinese)
[2]Chouw N,Hao H.Significance of SSI and non-uniform near-fault ground motions in bridge response II:effect on response with modular expansion joint[J].Engineering Structures,2008,30(1):154-162.
[3]卢玉斌,武海军,赵隆茂.混凝土类材料动态拉伸强度的微观力学模型[J].爆炸与冲击.2013,33(3):275-281.LU Yubin,WU Haijun,ZHAO Longmao.A micro-mechanical model for dynamic tensile strength of concrete-like materials[J].Explosion and Shock Waves.2013,33(3):275-281.(in Chinese)
[4]Malhotra P K,Moth J H,Anthong F S.Seismic interaction at separation joints of an instrumented concrete bridge[J].Earthquake Engineering and Structural Dynamics,1995,24(3):1055-1067.
[5]Masroor A,Mosqueda G.Experimental simulation of base-isolated buildings pounding against moat wall and effects on superstructure response[J].Earthquake Engineering and Structural Dynamics,2002,41:2093-2109.
[6]吴斌,韩强,李忱.结构中的应力波[M].北京:科学技术出版社,2001.WU Bin,HAN Qiang,LI Chen.Stress waves in structures[M].Beijing:Science Press,2001.(in Chinese)
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