隧道爆破地震波下砌体建筑物滞回耗能特性研究
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摘要
通过研究隧道爆破地震波下砌体建筑物的滞回耗能特性,为爆破安全提供更充分的指导依据。对隧道爆破地震波下SDOF体系的某砌体建筑物的滞回耗能进行了相关性研究。基于不同爆心距下隧道爆破地震波实测振速,基于MATLAB编程,研究了爆心距对滞回耗能的影响,同时通过改变加载到模型上地震波荷载的振幅、频率及持时特性,研究了隧道爆破地震波三要素以及结构参数(固有周期、阻尼比)对滞回耗能的影响,并与天然地震波下滞回耗能进行了对比。结果表明:爆心距对滞回耗能有着显著影响,二者近似成反比例关系。不论是高频高振幅的爆破地震波还是低频低振幅的天然地震波对砌体建筑物滞回耗能有着相似的影响规律,但天然地震波下更注重的频率的影响,而爆破地震波下需更注重的是振幅的影响。结构物阻尼比对滞回耗能的影响较为显著,具体表现为阻尼比越大,滞回耗能值就越小,建议适当改变建筑材料物理力学性能进而增大其阻尼,提高其抗震性能。
In order to provide more sufficient guidance for blasting safety,the energy dissipation characteristics of hysteretic behavior of masonry buildings under tunnel blasting seismic waves was studied. The effect of hysteresis energy in SDOF masonry building has also been researched. Based on the measured blasting velocity of tunnel blasting seismic waves under different burst distances and the programming of MATLAB,the influence of different blasting center distances on hysteretic energy was researched firstly. Moreover,the influence of three factors of blasting wave and structure parameters( natural period,damping ratio) on the hysteretic energy was studied by changing the amplitude,frequency and time-dependent characteristics of the seismic wave load applied to the model and compared with natural seismic wave. The results show that the distance has a significant impact on hysteretic energy and shows linear relationship between inversely proportionality. Whether high frequency and high amplitude of blasting seismic wave or low frequency and low amplitude of natural seismic wave,has similar effect on the hysteretic energy,but frequency should be payed more attention under the natural seismic wave,and the amplitude under blasting wave. The effect of structural damping ratio on hysteretic energy dissipation is more obvious. The larger the damping ratio is,the smaller the hysteresis energy dissipation value is. Therefore,it is suggested that the physical and mechanical properties of building materials should be changed appropriately to increase damping and seismic performance.
In order to provide more sufficient guidance for blasting safety,the energy dissipation characteristics of hysteretic behavior of masonry buildings under tunnel blasting seismic waves was studied. The effect of hysteresis energy in SDOF masonry building has also been researched. Based on the measured blasting velocity of tunnel blasting seismic waves under different burst distances and the programming of MATLAB,the influence of different blasting center distances on hysteretic energy was researched firstly. Moreover,the influence of three factors of blasting wave and structure parameters( natural period,damping ratio) on the hysteretic energy was studied by changing the amplitude,frequency and time-dependent characteristics of the seismic wave load applied to the model and compared with natural seismic wave. The results show that the distance has a significant impact on hysteretic energy and shows linear relationship between inversely proportionality. Whether high frequency and high amplitude of blasting seismic wave or low frequency and low amplitude of natural seismic wave,has similar effect on the hysteretic energy,but frequency should be payed more attention under the natural seismic wave,and the amplitude under blasting wave. The effect of structural damping ratio on hysteretic energy dissipation is more obvious. The larger the damping ratio is,the smaller the hysteresis energy dissipation value is. Therefore,it is suggested that the physical and mechanical properties of building materials should be changed appropriately to increase damping and seismic performance.
引文
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[2]张振浩,陈威,唐逸葵,等.基于MATLAB的地震作用下SDOF体系能量响应时程分析[J].应用基础与科学学报,2017,25(1):114-127.ZHANG Zhen-hao,CHEN Wei,TANG Yi-kui,et al.Energy response time course analysis of SDOF system under seismic action based on MATLAB[J].Journal of Applied Basic and Science,2017,25(1):114-127.(in Chinese)
[3]罗晓碧,赵明生,池恩安,等.爆破震动特性对滞回耗能谱影响研究[J].爆破,2012,29(4):28-37.LUO Xiao-bi,ZHAO Ming-sheng,CHI En-an,et al.Study on influence of blasting vibration characteristics on hysteretic energy dissipation spectrum[J].Blasting,2012,29(4):28-37.(in Chinese)
[4]王亚勇.关于设计反应谱,时程法和能量法的探讨[J].建筑结构学报,2000,21(1):21-28.WANG Ya-yong.Discussion on design response spectrum,time course method and energy method[J].Journal of Building Structures,2000,21(1):21-28.(in Chinese)
[5]周云,郭照阳,杨冠男,等.阻尼砌体填充墙框架结构抗震性能试验研究[J].建筑结构学报,2013,34(7):89-96.ZHOU Yun,GUO Zhao-yang,YANG Guan-nan,et al.Experimental study on seismic behavior of damped masonry filled wall frame structure[J].Journal of Building Structures,2013,34(7):89-96.(in Chinese)
[6]赵明生,池恩安,梁开水,等.段药量对滞回耗能谱的影响研究[J].爆破,2013,30(2):21-24.ZHAO Ming-sheng,CHI En-an,LIANG Kai-shui,et al.Study on the influence of the dose on hysteresis energy spectrum[J].Blasting,2013,30(2):21-24.(in Chinese)
[7]郭仕群.工程结构抗震设计[M].成都:西南交通大学出版社,2013.
[8]盛明强.基于滞回耗能的结构抗震性能评价方法研究[D].上海:同济大学,2008.SHENG Ming-qiang.Study on seismic performance evaluation of structures based on hysteretic energy consumption[D].Shanghai:Tongji University,2008.(in Chinese)
[9]柳国怀.结构地震差动输入理论、模型和方法[M].北京:科学出版社,2015.
[10]郑山锁,薛建阳,王斌.砌体结构抗震[M].北京:中国建材工业出版社,2008.
[11]PARK Y,ANG A H,WEN Y K.Seismic damage analysis of reinforced concrete buildings[J].Journal of Structural Engineering.1985,111(4):740-757.