外壳预制核心现浇装配式T型节点抗爆性研究

Research on Anti-explosion Performance of T-type Joint with Precast External Shell and Cast-in-place Concrete Core

目的研究外壳预制核心现浇装配式结构体系在爆炸环境下的变形及力学性能,分析其在爆炸情况下的可靠性.方法建立了相同配筋率的整体现浇和外壳预制核心现浇T型节点有限元模型,进行相同爆炸荷载下的节点结构数值模拟及损害特征程度分析.结果两种不同施工工艺的T型节点钢筋应力和位移变化基本一致;新型T节点预制外壳提升了对核心混凝土的保护作用,与现浇T节点相比其损坏情况较弱;爆炸冲击波对新型T节点虽也造成了局部破坏,但未出现大面积混凝土碎裂.结论外壳预制核心现浇装配式结构具有良好的整体性和抗爆性.

The construction technology of precast external shell and cast-in-place core prefabricated concrete has the advantages of convenient construction and template saving.A finite element model was developed to simulate the T type joints made by the integral prefabricated shell core cast-in-place under the same reinforcement ratio.The developed model was validated by the experimental data,and it was used to conduct the numerical simulation of the joint structure and analysis of the damage features under the same blast loading.The simulation results reveal that the stress and displacement variation of the bar in the T type joints were almost the same despite the employment of the different construction techniques.Moreover,the new T type joint made by the precast external shell method enhanced the protection of the core concrete.Compared with the integral cast-in-place,the new type joint also featured low damage of the core concrete.Although the blast wave incurred a tiny local damage,concrete fragmentation in large area were not observed.Structural system of precast external shell and cast-in-place core concrete has good antiknock ability.