摘要
选取161条速度脉冲型近断层地震动记录,采用最小二乘法拟合得到近断层地震动抗震设计Newmark三联谱,研究了震级、场地和断层类型对近断层设计谱的影响。结果表明:大震(级)相比小震(级)的影响较为显著,大震(级)下设计谱具有更宽的加速度敏感区段,中长周期段内的反应谱谱值更高;在3类断层类型中,大震(级)下逆斜断层的反应谱加速度敏感区段最宽,谱值最大。对于近断层区域的结构在大震(级)下应该考虑增大特征周期并提高设计谱谱值,还应充分考虑逆斜断层等断层类型的影响。
The 161 near-fault ground motion records containing velocity pulses were selected,by using the least squares method to fit the Newmark triple spectrum of seismic design for near-fault ground motions.The influences of magnitude,site and fault type on near-fault design spectrum were studied.The results show that the effect of large earthquake magnitude is more clear than that of small earthquake magnitude.The design response spectrum under the large earthquake magnitude has a wider acceleration sensitive section,and the response spectrum values in the medium and long periods are higher.Among the three type faults of the near-fault ground motion records,the acceleration sensitive region for the response spectrum of the reverse-oblique fault is the widest and the spectrum value is the largest under the large earthquake.For structures in the near-fault area,it should be considered to increase the characteristic period and improve the design spectrum value under the condition of the large earthquake magnitude.The influence of the earthquake mechanism such as reverse-oblique faults should be fully considered.
作者
石晓彤
王东升
李雨润
SHI Xiaotong;WANG Dongsheng;LI Yurun(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China)
出处
《世界地震工程》
CSCD
北大核心
2022年第3期184-191,共8页
World Earthquake Engineering
基金
河北省自然科学基金资助项目(E2020202038)。
关键词
近断层地震动
Newmark设计谱
震级
断层类型
near-fault ground motions
Newmark design spectrum
earthquake magnitude
fault type
