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.
To evaluate the impact resistant performance of reinforced concrete （ RC ） beams strengthened with the High Strength Steel Wire Mesh and Polymer Mortar （HSSWM- PM） , on the basis of experiments on three un-retrofitted RC beams and four retrofitted RC beams in drop-weight impact tests, a finite element model was established by using ANSYS/ LS-DYNA code to simulate and predict the impact resistant behavior of RC beams specimens. Then the process parameters of reinforcement, such as the diameter of steel wire and mortar layer thickness of cement mortar were studied. The results show that the impact resistance performance of RC beams retrofitted with HSSWM-PM is greatly improved; The thickness of cement mortar and the diameter of steel wire have obvious advantages on the improvement of impact resistance performance, and increasing the thickness of mortar layer and diameter of steel wire appropriately is beneficial to alleviate cracks on beam and change the failure mode. It is essential to consider the effect of the thickness of mortar layer and the diameter of steel wire on the impact resistant behavior properly in practical engineering.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第6期63-74,共12页
Journal of Vibration and Shock
基金
国家自然科学基金面上项目资助(51378046
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
关键词
钢筋混凝土梁
高强钢绞线网
聚合物砂浆
抗冲击性能
数值模拟
reinforced concrete beam
high strength steel wire mesh
polymer mortar
impact resistant performance
numerical simulation
