灌浆套筒连接装配式剪力墙爆炸响应及参数分析

为了研究采用灌浆套筒连接装配式剪力墙结构的抗爆性能，应用显式动力分析软件LS-DYNA建立了现浇剪力墙和装配式剪力墙的有限元模型，对不同爆炸荷载下剪力墙的破坏形态和动态响应进行了模拟分析；扩充影响参数范围，进一步研究了墙体厚度和混凝土强度等级等因素对装配式剪力墙结构抗爆性能的影响。数值分析表明:对于装配式剪力墙，由于坐浆层处存在新旧混凝土的薄弱粘结面，爆炸作用下首先发生破坏，爆炸应力波聚集于坐浆层周围的墙体内部，导致局部发生脆性破坏；现浇剪力墙刚度分布比较均匀，爆炸作用下背爆面的混凝土首先被拉裂，最终发生弯曲破坏；增加墙体厚度、提高混凝土强度等级和改变炸药爆炸位置均可改善装配式剪力墙的抗爆性能。

Explosive response and parameters analysis of prefabricated shear wall connected by grouting sleeve

In order to study the antiknock performance of the prefabricated shear wall structure connected by grouting sleeve. The finite element model of the cast-in-place shear wall and the prefabricated shear wall connected by grouting sleeve was established by using explicit dynamic analysis software LS-DYNA. The failure pattern and dynamic response of shear wall was simulated and was analyzed under different explosion loads. The influence parameter range was expanded to further study the influence of factors such as thickness of the wall, concrete strength grade and other factors on the antiknock performance of the prefabricated shear wall structure. The numerical analysis showed that the grouting layer of the prefabricated shear wall was firstly failed under the effect of explosion, which was due to the weak bonding surface of new and old concrete at the grout layer. The explosion stress wave was concentrated inside the wall around the grout layer, which led to brittle failure in the local area of the prefabricated shear wall. The stiffness distribution of the cast-in-place shear wall was relatively uniform. The concrete at the back of the shear wall was firstly cracked under the effect of explosion, which led to bending failure of the cast-in-place shear wall. The antiknock performance of the prefabricated shear wall can be improved by increasing the thickness of the wall, increasing the strength level of the concrete and changing the explosive position.