钢筋混凝土简支板梁桥爆破拆除数值模拟研究

发布时间：2019-04-02 08:37

【摘要】：数值模拟为桥梁爆破拆除的关键步骤之一,为了实现对钢筋混凝土简支板梁桥爆破拆除过程的有限元数值模拟,运用动力分析软件——ANSYS/LS-DYAN建立了分离式共节点模型。首先,比较分析了在板梁两侧切口与跨中切口采用微差爆破与不采用微差爆破两种方案下的爆破效果;其次,对跨中裸露钢筋的受力过程进行了分析;最后,对板梁的下落速度进行了对比分析。结果表明:分离式共节点模型可以体现出钢筋和混凝土的力学性能差异;采用微差爆破的爆破效果更好。
[Abstract]:The numerical simulation is one of the key steps of bridge blasting demolition. In order to realize the finite element numerical simulation of the blasting demolition process of reinforced concrete simply supported slab girder bridge, a separated co-node model is established by using the dynamic analysis software-ANSYS/LS-DYAN. First of all, the blasting effects of two kinds of blasting schemes are compared and analyzed, and then, the stress process of the exposed steel bars in the span is analyzed, and the blasting results are compared between the two kinds of schemes: one is using the differential blasting on both sides of the slab beam and the other on the other is using the non-differential blasting method. Finally, the falling velocity of plate beam is compared and analyzed. The results show that the separated common node model can reflect the difference of mechanical properties between steel bar and concrete, and the blasting effect with differential blasting is better.
【作者单位】：长安大学公路学院;山东高速股份有限公司;
【基金】：国家自然科学基金面上项目(51278064);国家自然科学基金(51208056) 云交科教[2011]355号;云交科201117-a
【分类号】：U445.6

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