高强不锈钢筋UHPC梁受弯性能试验研究
Experimental study on flexural properties of high-strength stainless steel UHPC beams
李海云 1韩金良 1李然 1王远航 1赵晶 2黄群广3
作者信息
- 1. 石家庄铁道大学,河北石家庄 050043
- 2. 广州地铁设计研究院股份有限公司,广东广州 510000
- 3. 中国铁建大桥工程局集团有限公司,天津 300300
- 折叠
摘要
本次试验设计了6根超高性能混凝土(Ultra-High Performance Concrete,UHPC)梁,4根配置双相体不锈钢筋、1根配置奥氏体不锈钢筋、1根配置普通钢筋作为对照组,通过三分点加载的方式对梁进行受弯试验.通过钢筋直径、钢筋种类、截面尺寸等参数的变化来研究高强不锈钢筋UHPC梁的承载力的变化.通过试验发现,UHPC梁在配置双相体不锈钢筋时比配置普通钢筋时在承载力上有所提升.配置奥氏体不锈钢筋的梁比配置双相体不锈钢筋的梁在承载力方面也有一定程度提升.随着配筋率增加可减缓裂缝的发展速度,根据平截面假定、UHPC与不锈钢筋的应力-应变关系式提出了不锈钢筋UHPC梁受弯承载力表达式,可以较好地反映梁受弯性能.引入了最大裂缝宽度修正系数,经修正的最大裂缝宽度计算式可较准确地计算不锈钢筋UHPC梁的最大裂缝宽度.
Abstract
In this experiment,six UHPC beams are designed,four with duplex stainless steel bars,one with austenitic stainless steel bars,and one with ordinary steel bars as the control group.The beams are subjected to bending tests by three-point loading.The change of bearing capacity of high strength stainless steel reinforced UHPC beam is studied by the changes of parameters such as steel bar diameter,steel bar type,and section size.Through experiments,it is found that the bearing capacity of UHPC beams configured with duplex stainless steel bars is higher than that of ordinary steel bars.The bearing capacity of beams equipped with austenitic stainless steel bars is also improved to a certain extent than that of beams configured with duplex stainless steel bars.With the increase of reinforcement ratio,the development speed of cracks can be slowed down.According to the assumption of plane section,the stress of UHPC and stainless steel bars-The strain relationship is proposed to express the flexural bearing capacity of the stainless steel UHPC beam,which can better reflect the flexural performance of the beam.The maximum crack width correction factor is introduced,and the revised maximum crack width formula can more accurately calculate the maximum crack width of stainless steel UHPC beams.
关键词
高强不锈钢筋/超高性能混凝土/受弯承载力/裂缝宽度Key words
high strength stainless steel rebar/Ultra High Performance Concrete(UHPC)/bending capacity/crack width引用本文复制引用
出版年
2024
NETL
NSTL
万方数据