负弯矩作用下钢-混凝土组合与叠合梁静力性能试验研究  

Experimental Study on Static Behavior of Steel-concrete Composite and Laminated Beam under Negative Moment

作　　者：段树金 王园园 梁显 牛润明 李芳 马学振 DUAN Shujin;WANG Yuanyuan;LIANG Xian;NIU Runming;LI Fang;MA Xuezhen(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《铁道学报》2020年第9期120-126,共7页Journal of the China Railway Society

基　　金：河北省高校科学技术研究重点项目(ZD2018025);2017年研究生创新资助项目(CXZZSS2017077)。

摘　　要：在钢-混凝土双面组合梁(DCB)的基础上,提出了钢-混凝土组合与叠合梁结构(CLB)。给出了CLB截面弯曲刚度、极限弯矩的简化计算方法。为进一步研究CLB结构的受力性能,设计了二根简支CLB和一根简支DCB模型,进行了反向加载试验,得到了完整的荷载-挠度曲线、典型截面正应变分布、钢筋混凝土顶板开裂情况和钢梁与混凝土顶板间叠合界面相对滑移曲线。研究结果表明:CLB结构的塑性极限承载能力低于DCB结构;正常使用阶段,二者的承载能力相当,但CLB结构的抗裂性能却远优于DCB结构:前者混凝土顶板开裂呈弯曲型,裂缝宽度窄,而后者混凝土顶板开裂基本呈轴拉型,裂缝宽度较大。CLB结构更适用于连续组合梁桥的负弯矩区。Based on the double steel-concrete composite beam(DCB),the structure of steel-concrete composite and lamination beam(CLB)was proposed.A simplified method for calculating the bending stiffness and ultimate bending moment of CLB section was presented.In order to further study of the mechanical properties of the CLB structure,the experiments for two simply supported CLB box girders and one simply supported DCB box girder under reversing load were carried out.The complete load-deflection curve,typical cross-section normal strain distribution,the crack distribution and width of the top reinforced concrete plate,and the relative slip curve of the overlapped interface between steel beam and top concrete plate were obtained.The results show that the bending stiffness and the strength of the DCB are higher than those of the CLB.Under regular service loading,although the strength for both structures is almost equivalent,the crack resistance of the CLB structure is much better than that of the DCB:the CLB develops with V-type bending cracks with smaller maximum crack width,while the DCB shows tensile type cracks with relatively larger maximum crack width.The CLB structure is more suitable for the negative bending moment zone of the continuous composite beam bridge.

关 键 词：钢-混凝土组合与叠合梁(CLB) 负弯矩区 模型试验 承载能力 裂缝 

分 类 号：TU398[建筑科学—结构工程]