局部半包裹部分包覆钢-混凝土组合梁受弯性能试验研究
Experimental study on bending performance of partially semi-wrapped partially-encased composite beam with steel and concrete
李亚明 1刘宏欣 1贾水钟 1杨宇焜 2李杰 3徐瑜4
作者信息
- 1. 上海建筑设计研究院有限公司,上海 200041;上海建筑空间结构工程技术研究中心,上海 200041
- 2. 上海结奕建筑科技有限公司,上海 200120
- 3. 上海杉达学院,上海 201206
- 4. 上海世博文化公园建设管理有限公司,上海 200125
- 折叠
摘要
针对部分包覆钢-混凝土组合梁柱节点区域后浇筑混凝土不易密实的问题,研究了受拉侧混凝土对局部半包裹部分包覆钢-混凝土组合梁(局部半包裹PEC梁)受弯性能的影响,进行了 2 根不同构造的局部半包裹PEC梁的四点弯曲试验,模拟局部半包裹PEC梁负弯矩区受力状态,对其受弯性能、延性、破坏形式等展开分析.结果表明:局部半包裹PEC梁表现出良好的延性,挠度达到l0/50 时截面抗弯承载力并未下降.型钢主钢件、混凝土的应变沿截面高度方向大致呈线性变化,可引用平截面假定计算受弯承载力及刚度.局部半包裹PEC梁受拉侧混凝土对其极限承载力与破坏模式影响不大,在计算局部半包裹PEC梁柱节点受力时可不考虑受拉侧混凝土作用,节点后浇筑区域可采用半包裹填充,以加快施工进度.此外,对局部半包裹PEC梁进行建模,进行梁受弯过程的有限元分析,对比模拟结果与试验结果,二者荷载-挠度曲线吻合较好,误差均在 10%以内.
Abstract
In addressing the issue of inadequate compaction of post-poured concrete in the joint area of partially-encased composite beam-column joint with steel and concrete,the impact of tensile-side concrete on the bending performance of partially semi-wrapped partially-encased composite beam with steel and concrete(partially semi-wrapped PEC beam)was studied.Two partially semi-wrapped PEC beams with different configurations underwent four-point bending tests to simulate the loading conditions in the negative bending moment region of partially semi-wrapped PEC beams.A comprehensive analysis was conducted on their bending performance,ductility,and failure modes.The results show that the partially semi-wrapped PEC beam exhibit excellent ductility,and the bending capacity of the cross-section does not decrease when the deflection reaches l0/50.The strain distribution of the main steel section and concrete roughly follows a linear trend along the height of the cross-section,and the plane section assumption can be used to calculate the bending capacity and stiffness.The influence of tensile-side concrete of partially semi-wrapped PEC beam on their ultimate bearing capacity and failure mode is minimal.When calculating the stress of partially semi-wrapped PEC beam-column nodes,the effect of tensile-side concrete can be neglected,and the post-pouring area of the joint can be filled with semi-encased concrete to expedite construction progress.Additionally,modeling of partially semi-wrapped PEC beams was conducted,followed by finite element analysis of the beams under bending.A comparison of the simulation results with experimental outcomes showed good agreement,with the load-deflection curves closely aligned and errors consistently within 10%.
关键词
局部半包裹部分包覆钢-混凝土组合梁/破坏模式/受弯承载力/延性Key words
partially semi-wrapped partially-encased composite beam of steel and concrete/damage mode/bending capacity/ductility引用本文复制引用
基金项目
上海市科学技术委员会科研计划项目(21DZ1203002)
华东建筑集团股份有限公司课题(20-1类-0073-结)
出版年
2024
NETL
NSTL
万方数据