型钢-钢纤维混凝土局部组合梁性能试验与能耗研究  

Experimental Study on the Performance and Energy Dissipation of Locally Composite Steel and Steel Fiber Reinforced Concrete Beams

作　　者：伍凯[1] 张雁杰 刘晓艺 陆荟宇 徐超 WU Kai;ZHANG Yanjie;LIU Xiaoyi;LU Huiyu;XU Chao(College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China;Institute of Civil and Architectural Engineering,Tongling University,Tongling 244000,China)

机构地区：[1]河海大学土木与交通学院,南京210024 [2]铜陵学院建筑工程学院,安徽铜陵244000

出　　处：《建筑钢结构进展》2023年第10期16-27,共12页Progress in Steel Building Structures

基　　金：国家自然科学基金(51208175);中央高校基本科研业务费专项项目(B200202067)。

摘　　要：为解决型钢混凝土结构的施工难题,充分发挥材料性能优势,采用钢纤维代替钢筋笼并将钢纤维混凝土集中应用于受压区,形成型钢-钢纤维混凝土局部组合梁。以组合梁长度、型钢规格、钢纤维掺量和钢纤维混凝土厚度为设计参数,完成了18个梁试件的性能试验,研究了破坏形态和荷载-挠度曲线,定量分析了试件的总能耗及能耗分布。结果表明:受到弯剪扭耦合影响,型钢-钢纤维混凝土局部组合梁的破坏形态可分类为界面破坏、弯扭破坏和弯曲破坏。多数试件的破坏对称性较好,跨中挠度的增长速率快于分载点处挠度的增长速率;少量试件的破坏严重不对称,破坏集中在单侧弯剪段,导致该侧的挠度增长速率甚至快于跨中的挠度增长速率。发生弯扭破坏的试件的平均能耗不仅小于发生弯曲破坏的试件的平均能耗,甚至小于发生界面破坏的试件的平均能耗。其他设计参数相同的情况下,当钢纤维掺量由0增加到1%时,试件的能耗明显增强,而钢纤维掺量由1%增加到2%时,能耗的增强效果并不明显。弯剪段的能耗更容易受到试件长度的影响,随着弯剪段长度的增加,虽然能耗的范围增大,但试件的峰值荷载降低,弯剪段承受的剪切作用减弱,单位长度的能耗反而有所降低。In order to solve the problems of steel reinforced concrete structure during construction and take advantage of material properties,steel fibers instead of rebar cages are used to make a locally composite steel and steel fiber reinforced concrete(LCSSFRC)beams,in which steel fiber reinforced concrete is mainly used in the compression zone.Beam length,structural steel specification,steel fiber content and concrete cover thickness are considered as design parameters.18 beam specimens were tested to study the failure modes and load-deflection curves,and the total energy dissipation and energy dissipation distribution were quantitatively analyzed.Results show that the specimens exhibit interfacial failure,bending-torsion failure and bending failure under the coupling effect of bending moment,shear force and torsion.Most specimens failed symmetrically,and the growth rate of deflection at midspan is faster than that at the loading point.A small number of specimens failed asymmetrically,and the failure is concentrated at the unilateral bending-shear zone,resulting in a faster growth rate of deflection at the bending-shear zone compared with that at midspan.The average energy dissipation of specimens with bending-torsion failure is not only less than that of specimens with bending failure,but also less than that of specimens with interface failure.The energy dissipation of the specimen increases significantly when the steel fiber content increases from 0%to 1%,while the enhancement is not obvious when the steel fiber content increases from 1%to 2%.The energy dissipation of the bending-shear zone is more affected by the specimen length.With the increase of the length of the bending-shear zone,although the range of energy dissipation increased,the peak load decreases,and the shear action of the bendingshear zone is weakened,decreasing the energy dissipation per unit length.

关 键 词：型钢混凝土 钢纤维混凝土 界面破坏 荷载-挠度曲线 能耗 

分 类 号：TU389.9[建筑科学—结构工程]