混凝土叠合板在装配式建筑中得到了较为广泛的应用,但在桥梁结构中应用较少。为拓展叠合板的应用范围,文章提出了一种在钢桁-混凝土组合梁中应用的超高性能混凝土(ultra high performance concrete,UHPC)桁架筋叠合板。通过受力分析,得...混凝土叠合板在装配式建筑中得到了较为广泛的应用,但在桥梁结构中应用较少。为拓展叠合板的应用范围,文章提出了一种在钢桁-混凝土组合梁中应用的超高性能混凝土(ultra high performance concrete,UHPC)桁架筋叠合板。通过受力分析,得到了UHPC桁架筋叠合板在钢桁-混凝土组合梁中应用的合理构造形式,结果表明:采用UHPC桁架筋叠合板不仅能有效提升预制板的刚度和承载力,发挥其材料优势作用,同时可实现全桥无模版化施工,提高钢桁组合梁的装配化水平。展开更多
To promote the application of green renewable materials in concrete composite slabs(CCSs)and study the flexural behavior of CCSs with different shapes,the bending performances of three CCSs with a SFRRAC base plate,on...To promote the application of green renewable materials in concrete composite slabs(CCSs)and study the flexural behavior of CCSs with different shapes,the bending performances of three CCSs with a SFRRAC base plate,one cast-in-site concrete slab of ordinary concrete and one CCS of ordinary concrete by steel bar truss(as recommended in the technical specification for precast concrete structures in Chinese)were compared through experiments.The carrying capacity,flexural behaviour and bi-directional mechanical properties of the specimens were systematically analyzed from the failure modes,load-deflection curves,load-bar strain curves,load-slip curves and crack distributions.Results show that the bending failure process of CCSs with a SFRRAC base plate is similar to that of the cast-in-site concrete slab of ordinary concrete and CCS of ordinary concrete by steel bar truss,as all of them went through the plastic phase,elastic plastic phase and failure phase with fully developed cracks and deflection.No sudden breakage or horizontal cracking of the connecting interface between the base plate and concrete topping was observed.The shape of the base plate has a major impact on the bearing capacity of the CCS with the SFRRAC base plate.When calculating the ultimate bearing capacity with the plastic yield line theory,the influence of the base plate shape on the plastic yield line position should be taken into account.展开更多
文摘混凝土叠合板在装配式建筑中得到了较为广泛的应用,但在桥梁结构中应用较少。为拓展叠合板的应用范围,文章提出了一种在钢桁-混凝土组合梁中应用的超高性能混凝土(ultra high performance concrete,UHPC)桁架筋叠合板。通过受力分析,得到了UHPC桁架筋叠合板在钢桁-混凝土组合梁中应用的合理构造形式,结果表明:采用UHPC桁架筋叠合板不仅能有效提升预制板的刚度和承载力,发挥其材料优势作用,同时可实现全桥无模版化施工,提高钢桁组合梁的装配化水平。
基金The National Natural Science Foundation of China(No.51578446).
文摘To promote the application of green renewable materials in concrete composite slabs(CCSs)and study the flexural behavior of CCSs with different shapes,the bending performances of three CCSs with a SFRRAC base plate,one cast-in-site concrete slab of ordinary concrete and one CCS of ordinary concrete by steel bar truss(as recommended in the technical specification for precast concrete structures in Chinese)were compared through experiments.The carrying capacity,flexural behaviour and bi-directional mechanical properties of the specimens were systematically analyzed from the failure modes,load-deflection curves,load-bar strain curves,load-slip curves and crack distributions.Results show that the bending failure process of CCSs with a SFRRAC base plate is similar to that of the cast-in-site concrete slab of ordinary concrete and CCS of ordinary concrete by steel bar truss,as all of them went through the plastic phase,elastic plastic phase and failure phase with fully developed cracks and deflection.No sudden breakage or horizontal cracking of the connecting interface between the base plate and concrete topping was observed.The shape of the base plate has a major impact on the bearing capacity of the CCS with the SFRRAC base plate.When calculating the ultimate bearing capacity with the plastic yield line theory,the influence of the base plate shape on the plastic yield line position should be taken into account.
