摘要
为研究装配式钢筋桁架叠合板组合梁在负弯矩荷载下的受力性能,同时考虑传统预制底板出筋的形式给运输和现场施工带来的不便和安全隐患,提出一种预埋新型角钢连接件形式的钢-叠合板组合梁,采用反向静力加载试验,对比分析了预埋新型角钢连接件形式和传统预制底板出筋形式钢-叠合板组合梁的裂缝发展、破坏模式、界面滑移规律、加载点沿截面高度的应变以及跨中截面与1/4跨处的荷载-挠度变化,并根据不同计算方法的结果提出计算钢-叠合板组合梁裂前刚度的适用方法,同时采用ABAQUS有限元软件分析了不同叠合板纵向配筋率和新型角钢连接件尺寸对钢-叠合板组合梁受力性能的影响。结果表明:预埋新型角钢连接件的叠合板组合梁与传统预制底板出筋形式的叠合板组合梁的破坏形式基本相似,都发生了弯曲-纵向剪裂的破坏;抗弯承载力两者基本相同,但新型叠合板组合梁抗弯刚度要大于传统预制底板出筋形式的叠合板组合梁,且协同变形能力也更优;叠合板的纵向配筋率和新型角钢连接件的尺寸对钢-叠合板组合梁的受力性能均有影响,提高纵向配筋率以及新型角钢连接件的长度可提升钢-叠合板组合梁的承载力和刚度,而新型角钢连接件的高度对钢-叠合板组合梁无明显影响;通过不同公式对钢-叠合板组合梁的裂前刚度进行计算对比,得出在计算钢-叠合板组合梁的裂前刚度时要考虑混凝土的抗拉作用及钢梁与混凝土间滑移效应的影响,且其与试验结果吻合较好。
A new type of angle steel connector embedded in steel-composite slab composite beams was proposed to investigate the stress performance of the assembled steel truss composite slab composite beams under negative bending moment load,while considering the inconvenience and safety hazards brought by the traditional precast bottom plate rib form for transportation and on-site construction.A reverse static loading test was conducted to compare and analyze the crack development,failure mode,interface slip law,strain along the height of the loading point,and load-deflection variation at the mid-span section and 1/4 span section of the steel-composite slab composite beams with the embedded new type of angle steel connector and the traditional precast bottom plate rib form.An applicable method for calculating the pre-crack stiffness of steel-composite slab composite beams was proposed based on the results of different calculation methods.The influence of different composite slab longitudinal reinforcement ratios and new type of angle steel connector sizes on the stress performance of steel-composite slab composite beams was analyzed by ABAQUS finite element software.The results show that the steel-composite slab composite beams with the embedded new type of angle steel connector have a similar failure mode to those of the traditional precast bottom plate rib form,which is bending-vertical shear failure.Both types of composite beams have similar bending capacity,but the new type of composite beams have higher bending stiffness and better synergistic deformation capacity.The longitudinal reinforcement ratio of the composite slab and the size of the new type of angle steel connector have an impact on the stress performance of the steel-composite slab composite beams.Increasing the longitudinal reinforcement ratio and the length of the new type of angle steel connector can improve the bearing capacity and stiffness of the steel-composite slab composite beams.However,the height of the new type of angle steel connector has no significant effect on the steel-composite slab composite beams.By comparing different formulas for calculating the pre-crack stiffness of the steel-composite slab composite beams,it is found that the tensile resistance of concrete and the slip effect between the steel beam and concrete should be considered when calculating the pre-crack stiffness of steel-composite slab composite beams.The calculated results shows a good agreement with the experimental results.7 tabs,18 figs,35 refs.
作者
丁克伟
房尚京
贾高宗
张星辰
DING Ke-wei;FANG Shang-jing;JIA Gao-zong;ZAHNG Xing-chen(Anhui Provincial Key Laboratory of Building Structure and Underground Engineering,Anhui Jianzhu University,Hefei 230601,Anhui,China;College of Civil Engineering,Anhui Jianzhu University,Hefei 230601,Anhui,China)
出处
《长安大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第4期68-81,共14页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(11472005)
安徽省高校协同创新项目(GXXT-2019-005)。
关键词
桥梁工程
钢-叠合板组合梁
静力试验
角钢
受力性能
刚度
bridge engineering
steel-composite slab composite beam
static test
angle steel
mechanical performance
stiffness
