基于反应谱分析的建(构)筑物爆破振动响应安全评估方法研究

利用大量爆破振动实际监测数据,对爆破振动速度反应谱谱面积SR与爆破地震波信号各特征量进行了关联分析,研究了SR对建筑结构振动损伤的影响和关联。研究发现SR值能较全面地反映爆破振动的综合作用效果,以及结构动力特性对结构振动破坏的影响。根据研究结果,提出了用SR作为爆破振动安全评估特征值的爆破地震效应评估新方法。132组爆破振动数据的计算与分析表明,SR>5.5时爆破地震波将对一般民房结构产生破坏的概率显著增加,可将SR2]≤5.5作为二类建(构)筑物爆破振动破坏安全判据标准的补充。在此研究的基础上,通过引入建(构)筑物爆破振动反应谱安全系数Prs的概念,初步建立了以SR为特征值,考虑爆破振动综合作用效应和结构振动特性的爆破振动安全统一判据。

STUDY ON SAFETY ASSESSMENT METHOD OF BLASTING VIBRATION RESPONSE BASED ON RESPONSE SPECTRUM

Through monitoring data of blasting vibration,relations between velocity response spectrum area of the blasting vibration(SR) and characteristic quantities of the blasting earthquake wave signal were analyzed.The influence of SR to vibration damage of the building structure and relations between them were studied.The results show that SR can comprehensively reflect the general effect of the blasting vibration and influences of structural dynamic characteristics to structural vibration damage.Then,a new method of the blasting seismic effect assessment was put forward that the SR was used as the blasting vibration safety assessment eigenvalue.The computation and the analysis of 132 groups blasting vibration data indicate that damage probability of general civil houses caused by blasting vibration increases significantly.≤5.5 can be used as a supplementary of blasting vibration damage safety criterion of the type II building.On this basis,the unified security criterion of blasting vibration was initially founded through introducing blasting vibration response spectrum safety factor of the building(Prs).In the unified security criterion,SR was as the blasting safety assessment eigenvalue and comprehensive effect of blasting vibration and vibration characteristics of the building structure were considered.