隧道爆破地震波下砌体建筑物滞回耗能特性研究

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。

Research on Hysteresis Energy of Masonry under Tunnel Blasting Wave

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 en-ergy 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 ampli-tude,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 line-ar 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.