徐鹏飞;王磊;张何;刘乐乐;
XU Peng-fei;WANG Lei;ZHANG He;LIU Le-le;College of Civil Engineering, Henan University of Technology;Zhongjiao Road Bridge North China Engineering Co., Ltd.;

• 1:河南工业大学土木工程学院
• 2:中交路桥华北工程有限公司

摘要(Abstract)：

为提高拆除爆破的精确性、可控性和可预测性,理论分析钢筋混凝土力学行为,建立钢筋混凝土本构关系计算方法,借助各向同性弹塑性模型,构建综合考虑配筋率对钢筋混凝土开裂载荷的影响、钢筋混凝土拉压损伤、受拉刚化效应、受压箍筋约束效应、应变率效应以及塑性应变失效准则的钢筋混凝土本构模型。在试验验证的基础上,基于纤维梁、分层壳单元和钢筋混凝土本构模型,对某一冷却塔爆破拆除预处理稳定性与倒塌过程进行数值模拟,数值模拟结果较好地吻合了实际结果。研究结果为钢混本构模型在拆除爆破中的应用提供了理论依据。
In order to improve the accuracy, controllability and predictability of demolition blasting, the mechanical behavior of reinforced concrete was theoretically analyzed, and the calculation method of constitutive relationship of reinforced concrete was established. With the aid of isotropic elastic-plastic model, constitutive model of reinforced concrete considering the effect of reinforcement ratio on cracking load, damage of reinforced concrete under tension and compression, tension stiffening effect, confinement effect of stirrups in compression, strain rate effect and failure criterion of plastic strain was constructed. On the basis of experimental verification, the stability and collapse process of a cooling tower demolished by blasting were simulated by using the constitutive model of reinforced concrete, fiber beam and layered shell element. The numerical simulation results are in good agreement with the actual results.The research results provide a theoretical basis for the application of the steel-concrete constitutive model in demolition blasting.

关键词(KeyWords)： 拆除爆破;钢筋混凝土本构模型;纤维梁和分层壳单元;稳定性分析;数值仿真
demolition blasting;reinforced concrete constitutive model;fiber beam and layer shell element;stability analysis;numerical simulation

Abstract:

Keywords:

基金项目(Foundation): 河南省科技攻关资助项目(182102210397);; 河南工业大学博士基金资助项目(31401103)

作者(Authors): 徐鹏飞;王磊;张何;刘乐乐;
XU Peng-fei;WANG Lei;ZHANG He;LIU Le-le;College of Civil Engineering, Henan University of Technology;Zhongjiao Road Bridge North China Engineering Co., Ltd.;

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