摘要
为了研究灌注桩施工过程中残留的泥皮厚度及不同钢管径厚比对钢管混凝土界面力学性能的影响,采用模拟水下浇筑混凝土的方法制备了6根钢管混凝土组合桩试件,对其进行了推出试验.通过试验分析了不同泥皮厚度及钢管径厚比下试件的荷载-滑移及黏结应力-滑移规律,研究了黏结强度计算方法.基于现有黏结强度计算模型,提出了考虑泥皮的极限黏结强度计算方法,将黏结应力-滑移本构关系简化为双线性模型,给出了相应的本构计算模型,并将简化模型计算值与试验数据做了对比分析.结果表明:泥皮的存在会降低钢混组合桩的黏结强度约10%～20%;径厚比对黏结性能的影响没有明显规律;简化模型计算的极限黏结强度值与实测值误差在20%以下,证明了简化模型的合理性.
In order to study the influence of residual mud during construction process and steel pipe with different radius-thickness ratios on the interface mechanical behavior of concrete filled steel tube,six steel tubular composite pile specimens were prepared by simulating underwater pouring of concrete for push-out tests.Through the tests,the load-slip and bond stress-slip curves were analyzed,and the bond strength calculation method was studied.Considering the influence of mud,the calculation method of ultimate bond strength is presented based on the existing bond strength calculation model.The bond stress-slip curve is simplified to be a bilinear model,and the corresponding constitutive relationship model equation is presented.And the experimental data is compared with the simplified bond stress-slip model.Experimental results show that the existence of mud weakens the bond strength of concrete-filled steel tube by approximately 10%to 20%.The influence of the radius-thickness ratio on the bond performance does not follow obvious rules.The results show that the error between the simplified model and the experimental value is smaller than 20%,which proves that the simplified constitutive relationship model is reasonable.
作者
冯升明
戴国亮
钮佳伟
龚维明
曹小林
Feng Shengming;Dai Guoliang;Niu Jiawei;Gong Weiming;Cao Xiaolin(School of Civil Engineering,Southeast University,Nanjing 210096,China;Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University, Nanjing 210096,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第6期987-995,共9页
Journal of Southeast University：Natural Science Edition
基金
国家重点研发计划重点专项资助项目(2017YFC0703408)
国家自然科学基金资助项目(51478109
51678145)
关键词
钢管混凝土
钢混组合桩
泥皮
径厚比
黏结强度
黏结滑移
concrete filled steel tube
steel tubular composite pile
mud
radius-thickness ratio
bond strength
bond-slip
