圆形截面玻璃纤维筋混凝土桩体抗剪承载力研究

发布时间：2018-03-21 12:55

本文选题：GFRP筋混凝土围护桩　切入点：圆形截面　出处：《土木工程学报》2016年09期 　论文类型：期刊论文

【摘要】：用GFRP筋来部分代替钢筋或预应力钢筋用于混凝土结构中,国内外已有大量研究和应用。目前对玻璃纤维(GFRP)筋混凝土结构受剪性能的研究,主要都是尺寸较小的矩形截面梁,关于圆形截面构件的斜截面受剪承载力的研究却极少。根据实际工程桩尺寸首次制作了比例为1∶1的试件,进行了二集中力三分点加载试验,试验中发现玻璃纤维筋混凝土梁具有剪切破坏的特征,通过对试验结果的分析并结合美国ACI规范与中国混凝土设计规范中抗剪承载力公式,推导出圆形截面GFRP筋混凝土梁的抗剪承载力公式,采用该公式计算的结果与实测值非常相近。进一步将上述理论应用在北京某地铁车站的基坑围护桩中,校核计算了盾构接收过程中围护桩的安全性,据此提出增大配筋率的建议。
[Abstract]:There has been a great deal of research and application in the use of GFRP bars to partially replace steel bars or prestressed bars in concrete structures at home and abroad. At present, the shear behavior of concrete structures reinforced with glass fiber reinforced concrete bars is mainly studied on rectangular beams with small size. However, little research has been done on the shear capacity of circular cross-section members. According to the actual engineering pile size, the specimen with a ratio of 1: 1 has been made for the first time, and the three-point loading test of two concentrated forces has been carried out. It is found that glass fiber reinforced concrete beams have the characteristics of shear failure. Through the analysis of the test results and combined with the shear bearing capacity formula of the American ACI code and the Chinese concrete design code, The shear bearing capacity formula of circular section GFRP reinforced concrete beams is derived. The calculated results are very close to the measured values. The above theory is further applied to the foundation pit retaining piles of a subway station in Beijing. The safety of retaining pile in shield receiving process is calculated and the suggestion of increasing reinforcement ratio is put forward.
【作者单位】：北京建筑大学;清华大学;南宁轨道交通集团有限责任公司;
【基金】：北京市自然科学基金北京市教育委员会科技计划重点项目(KZ201310016016) 北京市属高等学校创新团队建设与教师职业发展计划项目(IDHT20130512)
【分类号】：TU377.9

【相似文献】