公路双曲拱桥结构爆破拆除数值模拟

Numerical Simulation of Explosive Demolition of Highway Double Curved Arch Bridge

为了确保双曲拱桥的爆破拆除能够按照设计方案顺利进行,采用共节点分离式钢筋混凝土模型,对典型公路双曲拱桥结构爆破拆除过程进行了数值模拟,方案选择桥拱顶部预切缝0.5 m以及副拱立柱爆破范围1.6 m。模拟结果表明:对混凝土和钢筋单元的受力过程进行分析,共节点分离式模型可以体现混凝土和钢筋材料的力学性能差异;预切缝采用0.5 m足以保证桥身相互叠加彻底倒塌,副拱立柱爆破范围采用1.6 m可使得桥体解体比较完全,并且可以减小整体倒塌时间和爆堆高度。研究认为结构倒塌过程的数值模拟,将成为研究结构爆破拆除力学过程的重要手段并辅助指导结构爆破拆除设计,具有重要的工程实用价值。

To ensure the demolition blasting of double curved arch bridge smoothly, a numerical simulation on typical highway double curved arch bridge structure blasting demolition process was carried out based on common node separate reinforced concrete model with 0.5 m wide pre-eutting seam and vice-arch column blasting range I. 6 m. Results show that the common node separate model reflects mechanical properties difference of concrete and reinforcement based on their loading process. The 0.5 m wide pre-cutting seam is sufficient to ensure the superposition and collapse fully. The scheme of vice-arch blasting range of 1.6m can make the bridge disintegrated much more, which also decreased the whole collapse time and the height of muck pile, The simulation of the structure collapse will be an important means to study the mechanical process of structure blasting demolition.