摘要
爆破地震对房屋结构所产生的连续拉扭及超载作用 ,造成墙面体抹灰脱落、结构裂缝或开裂延伸等现象。在各振动物理量中 ,径向振动速度分量持续时间长、主频低且接近于房屋结构的自振频率 ,是引起结构物破坏的主要因素。通过长期对爆破振动数据采集分析及对结构裂缝现象观测 ,提出了适宜某场区普通民房结构的容许振动速度V =2cm/s。
Half a year's blast monitoring,found that the radial part of blasting vibration velocity lasts longer and its main frequency is close to low rise residential house basic frequency,which results in damage.By analyszing the response of different floors,the radial reponse velocityis magnified in second floor comparing with the ground's and the paramater β=1.5. This paper recommends that the permitted oscillatory velocity of low rise residential house is V=2 cm/s when the main frdquency domain during blasting is 6～15 Hz.
出处
《爆破》
CSCD
2000年第4期8-13,共6页
Blasting
关键词
普通民房
爆破震动
响应分析
安全振动速度
low rise residential house
blasting vibration
dynamic structural analysis
vibration velocity
