砂浆板冲击破坏试验研究  

Damage tests for a cement mortar plate under shock load

作　　者：顾培英[1,2] 邓昌[1,2] 章道生 汤雷[1,2] 王建[1,2] 

机构地区：[1]南京水利科学研究院,南京210029 [2]水利部水科学与水工程重点实验室,南京210029

出　　处：《振动与冲击》2015年第6期177-182,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51179107)

摘　　要：通过锤击、均匀冲击荷载试验,采用逐级递增循环冲击加载方式,研究冲击荷载下砂浆板的破坏特征及冲击力、冲击能与最大加速度响应间关系。试验表明,二种冲击作用均使砂浆板跨中区域出现贯穿裂缝,呈脆性劈裂破坏形态,均匀冲击作用下破坏位置与跨中有一定偏移;锤击力时程经历主冲击、次冲击、卸载三阶段,加速度响应随锤击力增加而增加,裂缝贯穿后冲击力、加速度响应大幅减小;均匀冲击下加速度有二组响应区,响应随冲击能增加而增加,当冲击能达一定程度时响应大幅减小;继续增加冲击能,响应又会增加,并较快发生劈裂破坏,响应大幅减小;支座螺栓松动能缓冲部分冲击作用。Hammering and uniform shock tests of a cement mortar plate were conducled. The opposite sides of the plate were elastic supports. Through cyclic shocks with amplitude increasing,the failure features,the relationship between shock force and acceleration response,and the relationship between impact energy and acceleration response of the plate were studied. The results showed that a transverse crack nearby the midspan of the plate appears,its failure state is brittle splitting; the location of failure offsets the midspan under uniform shock; time history curves of the hammering force include three stages of major shock,secondary shock and unloading; the acceleration response of the plate increases with increase in the hammering force,however,the hammering force and acceleration response decrease obviously after the transverse crack appears; there are two groups of acceleration response regions under uniform shock; the acceleration response increases with increase in impact energy; once impact energy reaches a certain level,the acceleration response decreases obviously; if impact energy continuously increases,the acceleration response increases again,brittle splitting failure occurs rapidly,and the acceleration response decreases obviously again; furthermore,support bolt loosening can absorb some impact energy.

关 键 词：冲击荷载 振动 破坏 砂浆板 

分 类 号：TV32[水利工程—水工结构工程]