灌浆套筒连接装配式框架-剪力墙爆炸响应与破坏

为了探究采用灌浆套筒连接的装配式框架-剪力墙结构的爆炸响应与破坏模式,运用LS-DYNA软件建立一榀两层的现浇框架-剪力墙和装配式框架-剪力墙的有限元模型,分别模拟分析了不同位置处发生爆炸时两种框架-剪力墙结构的动态响应及破坏模式,并对灌浆套筒连接的装配式框架-剪力墙进行了抗爆性能评估。研究结果表明:灌浆套筒连接的装配式框架-剪力墙结构整体性差,主要原因是预制构件和坐浆层、现浇带之间存在新旧混凝土的薄弱粘结面,粘结面的界面接触在爆炸荷载下首先发生断开,然后爆炸冲击力在结构局部区域发生聚集,使得结构的变形较为集中,容易造成结构局部发生严重的脆性破坏;现浇框架-剪力墙结构具有较好的整体性,爆炸冲击力在结构内能够有效地传递,而且构件之间具有良好的协同作用,结构变形较为均匀,现浇框架-剪力墙的破坏为延性破坏;炸药在结构中不同位置发生爆炸时,爆炸冲击波直接作用的构件损坏严重,其它构件损坏较轻。

Explosion Response and Failure Modes of Prefabricated Frame-shear Wall Connected by Grouting Sleeve

In order to study the explosion response and failure modes of the prefabricated frame-shear wall connected by grouting sleeve.A two-layer finite element model of cast-in-place frame-shear wall and assembled frame-shear wall was established by using software LS-DYNA.The dynamic response and failure modes of two kinds of frame-shear wall structures were simulated and analyzed,and the anti-explosion performance of the prefabricated frame-shear wall connected by grouting sleeve was evaluated.The results showed that the performance frame-shear wall connected by grouting sleeve was poor in the integral performance.The main reason is that there are some weak bonding surfaces of the old and new concrete between prefabricated components,slurry layer and cast-in-place area.The interface contact of the bonding surface is broken at first,and the explosion impact force is concentrated in the local area of the structure,and the deformation of the structure is relatively concentrated,which is easy to cause serious brittle failure in the local area of the structure.The cast-in-place frame-shear wall structure has a good integral performance.The explosion impact force can be transferred effectively within the structure and there is a good synergy between the components,which makes the deformation of the structure more uniform.The cast-in-place frame-shear wall occur ductile failure.When the explosives explode at different positions in the structure,the components directly affected by the blast wave are seriously damaged,while the other components are less damaged.