预应力喷砂玻璃纤维聚合物锚杆的黏结损伤

发布时间：2018-01-09 20:09

本文关键词：预应力喷砂玻璃纤维聚合物锚杆的黏结损伤　出处：《岩石力学与工程学报》2014年08期 　论文类型：期刊论文

【摘要】：纤维增强聚合物(FRP)可替代钢筋用于边坡加固来解决锚杆耐久性问题。FRP筋模量较小,为限制加固体的前期变形,需对其施加预应力。采用预应力施加装置完成循环加荷,光栅传感技术监测杆体应变,研究预应力施加及循环荷载下喷砂GFRP锚杆的黏结性能。研究表明,施加预应力使锚杆结构承受的过载会导致锚杆体界面黏结力损伤,同级荷载多次循环产生的损伤效应相对于过载的影响可以忽略不计;喷砂GFRP锚杆的黏结力损伤仅受过载的影响,与当前运行荷载无关;喷砂GFRP锚杆体上不同位置的界面剪力,在剪力较小时由黏结力承担,剪力较大时黏结力完全丧失转由摩阻力承担;喷砂GFRP锚杆加固结构承受峰值荷载过大后会导致黏结损伤造成锚固结构松动;预应力喷砂GFRP锚杆结构的超张荷载需超过运行荷载一定量值,以保障运行期锚固力稳定。
[Abstract]:Fiber reinforced polymer reinforced polymer (FRP) can be used instead of reinforcing bar to solve the durability problem of anchor rod. It is necessary to apply the prestressing force. The prestressing device is used to complete the cyclic loading. The grating sensing technology is used to monitor the strain of the bar, and the bonding performance of the sandblasting GFRP anchor under the prestressing force and cyclic load is studied. The overload caused by prestress will lead to the damage of the interfacial bond force of the anchor body, and the damage effect caused by the repeated cycles of the same class load can be neglected in relation to the overload. The bond force damage of sandblasting GFRP anchor is only affected by load, and has nothing to do with the current running load. The interfacial shear force at different positions on the sandblasting GFRP bolt body is assumed by the bonding force when the shear force is small, and when the shear force is large, the bonding force is completely lost by the friction resistance. Sand blasting GFRP bolt reinforcement structure will lead to bond damage and loose Anchorage structure when the peak load is too large. In order to ensure the stability of anchoring force, the overtension load of pre-stressed sand blasting GFRP bolt structure should exceed the certain value of running load.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学道路与铁道工程研究所;河海大学岩土工程科学研究所;广东肇阳高速公路有限公司;江苏山水环境建设集团股份有限公司;河海大学工程力学系;
【基金】：广东省教育部科技部产学研项目(2009B09060011) 中央高校基本科研业务费专项资金资助(2014B04914)
【分类号】：U418.52;U414
【正文快照】： 1引言传统锚杆一般选用螺纹钢作为杆体材料。工程中发现锚杆破坏失效最主要的原因是锚杆材料遭受腐蚀而破坏[1-2]。纤维增强聚合物FRP筋是一种由树脂基质和纤维材料复合而成的新型加固材料。相对于钢筋FRP筋材有以下优点:抗拉强度高,等于甚至高于预应力钢筋;耐久性好;自重轻,

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