段药量对滞回耗能谱的影响研究

Research on Influence of Charge Quantity in One Delay Time on Hysteretic Energy Spectra

为了研究段药量对滞回耗能谱的影响,进行了不同段药量爆破下的单孔振动试验。基于现场实测数据,利用Newmark-β时程分析方法与双线型恢复力模型对不同段药量爆破地震波作用下弹塑性SDOF结构进行能量反应,并以滞回耗能作为结构塑性累积损伤破坏的指标进行分析。结果表明:段药量是影响滞回耗能的重要因素,随着段药量的增加滞回耗能谱的峰值增大且峰值对应的结构的固有周期增大。因此可认为,段药量越大对结构产生的塑性累积损伤越大,越不利于结构的安全。研究成果可从能量的角度揭示段药量对结构塑性累积损伤破坏的影响,并为从能量的角度进行降振、抗振的深入研究提供分析基础。

In order to study the influence of charge quantity in one delay time on hysteretic energy spectra,a single hole vibration test was carried out under different charge quantity condition.Based on the measured field test data,the energy response of elastic-plastic SDOF structures under seismic waves of different charge quantities in one delay time was analyzed with Newmark-β time-historic analytical method and bilinear restoring force model.Results show that the charge quantity in one delay time was an important influencing factor on hysteretic energy;the peak value of hysteretic energy spectra and corresponding natural period of structure increased with the charge quantity in one delay time.It can be considered that,therefore,the higher charge quantity in one delay time caused greater plastic cumulative damage on structure.Research results revealed the impact of charge quantity on structure plastic cumulative damage and provided analysis basis for in-depth research of reducing vibration and anti-vibration from the viewpoint of energy.