建筑结构爆破振动响应应变率大小讨论  

Discussion of Strain Rate of Building Structure under Blasting Vibration Response

作　　者：张安康[1] 陈士海[1] 魏海霞[1] 张宪堂[1] 

机构地区：[1]山东科技大学土木建筑学院,青岛266510

出　　处：《爆破》2010年第3期9-12,共4页Blasting

基　　金：国家自然科学基金(50878123);山东省"泰山学者"建设工程专项经费;山东省土木工程防灾减灾重点实验室资助

摘　　要：为了计算应变率对材料性质的影响,需首先讨论应变率大小的求解问题。首先推导了简单应力波作用下一点应变率的求解公式,并提出了利用爆破测振的实验数据求解应变率的方法。根据现场爆破测振的数据,求解出不同结构构件中质点的应变率时程曲线和最大应变率。并根据爆破安全规程中规定的一般砖房、非抗震的大型砌块建筑物的爆破振动安全允许速度值计算出其对应的最大应变率。计算结果表明最大应变率的值保持在10-3量级以上,属于中等应变率,一般应变率效应不能再忽略。In order to calculate the effect on materials′ properties,the solving of strain rate should be discussed first.In this paper,the strain rate computation formulae of one point were given under simple stress wave,and the way was put forward for calculating strain rate using blasting vibration experimental data.Using these data,the strain rate-time curve and maximum strain rate of points in different structural members were calculated.The corresponding maximum strain rate of allowable maximum velocity of general brick building and non-seismic large masonries under blasting vibration defined in Blasting Safety Code was also calculated.The results indicate that all the maximum strain rates are around 10^-3,materials have enter rate-sensitive region,and strain rate effects can not be neglected generally.

关 键 词：建筑结构 爆破振动 应变率 动力强度 应力波 

分 类 号：O389[理学—流体力学]