水泥砂浆加固RC梁的抗冲击性能模拟分析

发布时间：2018-04-26 16:50

本文选题：钢筋混凝土梁 + 高强钢绞线网　；参考：《振动与冲击》2017年06期

【摘要】：为研究高强钢绞线网-聚合物改性水泥砂浆(简称聚合物砂浆)加固钢筋混凝土梁的抗冲击性能,在3根未加固梁和4根加固梁的落锤冲击试验的基础上,采用显式有限元分析软件ANSYS/LS-DYNA,建立了包括混凝土梁、冲击锤头在内的有限元模型,对在冲击荷载作用下加固前、后混凝土梁的抗冲击性能进行了数值分析。之后,对采用不同直径钢绞线和不同厚度聚合物砂浆加固层的钢筋混凝土加固梁进行了参数分析。研究结果表明:高强钢绞线网-聚合物砂浆加固能显著提高钢筋混凝土梁的抗冲击性能;合理增加砂浆加固层厚度有利于改善梁身裂缝和破坏模式;选用恰当直径的钢绞线加固钢筋混凝土梁有助于钢绞线承载能力的发挥;工程实际中,需合理考虑砂浆层厚度和钢绞线直径对加固效果的影响。
[Abstract]:In order to study the impact resistance of reinforced concrete beams strengthened with high strength steel wire mesh and polymer modified cement mortar (polymer mortar), the impact tests of 3 unstrengthened beams and 4 strengthened beams were carried out. An explicit finite element analysis software ANSYS- LS-DYNA is used to establish a finite element model including concrete beams and impact hammers. The impact resistance of concrete beams before and after strengthening under impact load is analyzed numerically. Then, the parameters of reinforced concrete strengthened beams with different diameter steel strands and different thicknesses of polymer mortar strengthened layer are analyzed. The results show that high strength steel wire mesh reinforced polymer mortar can significantly improve the impact resistance of reinforced concrete beams, reasonable increase of the thickness of mortar reinforcement layer is conducive to improve the beam body crack and failure mode. The selection of steel strands with proper diameter to reinforce reinforced concrete beams is helpful to exert the bearing capacity of steel strands. In engineering practice, the influence of mortar layer thickness and steel strand diameter on reinforcement effect should be considered reasonably.
【作者单位】：北京建筑大学工程结构与新材料北京市高等学校工程研究中心;中直管理局物业中心;中化方兴置业(北京)有限公司;中国人民解放军61517部队防爆减灾与环境控制研究中心;
【基金】：国家自然科学基金面上项目资助(51378045;51278490;50908010) 北京市属高等学校人才强教资助项目(067135300100) 北京市属高等学校高层次人才引进与培养计划项目资助北京节能减排关键技术协同创新中心(2011计划)资助
【分类号】：TU375.1

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