应力波效应对爆炸作用下RC桥损伤特性的影响  

Damage Characteristics of Stress Wave Effect on RC Bridge under Blast Loading

作　　者：李营[1] 李晓彬[1] 吴卫国[1] 李俊[1] 孔祥韶[1] 朱海清[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《爆破》2013年第3期15-19,103,共6页Blasting

基　　金：国防基础研究项目(A142008018);中央高校自主创新基金项目(2010 II002);中央高校基本科研业务费专项资金资助(2011YB08)

摘　　要：为了研究RC桥梁抗爆性能,分析了应力波传播的基本原理,采用AUTODYN软件建立了有限元计算模型,验证了计算方法的有效性,对空中爆炸作用下方形空心RC桥动态响应进行数值仿真,分析了方形截面RC桥应力波的传递路径和不同位置的损伤特点。得到以下结论:爆炸作用下RC桥损伤特性受应力波效应影响明显,且主要为自由面反射引起的拉应力;梁体上缘下表面损伤最为严重,须重点防护;梁体两缘上部形成"耳状"损伤;梁体下缘上表面中部出现明显损伤。In order to investigate performance of RC bridge under blast loading, the AUTODYN finite-element model was used to analyze the propagation principle of the stress wave, and verified the validity of the calculate method. The dynamic response of the hollow beam to the explosion in air was studied by numerical simulation, and the stress wave spreading path and the different damage characteristics on different parts of the rectangular beam were also analyzed. Results indicates that the RC beam will be damaged by the stress wave obviously, and mostly due to the tensile stress produced by the reflected wave; the lower-surface of the superior border and the upper-surface of the inferior border will be damaged seriously; and two Oars will be shaped on the other borders of the beam unex- pected.

关 键 词：应力波效应 爆炸作用 损伤特性 RC桥 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]