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工程科学与技术:2022,54(4):29-38
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竖向梯形波纹腹板PEC柱轴压性能研究
(西安建筑科技大学 土木工程学院,陕西 西安 710055)
Bearing Performance of PEC Column with Vertical Trapezoidal Corrugated Web Under Axial Compression
(School of Civil Eng., Xi’an Univ. of Architecture and Technol., Xi’an 710055, China)
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投稿时间:2021-05-10    修订日期:2021-06-10
中文摘要: 为了克服平腹钢板面外刚度较低,容易屈曲且与混凝土黏结较弱的特点,将梯形波纹钢板引入PEC柱中,形成梯形波纹腹板PEC柱截面形式。为研究其轴压承载性能,设计并完成5根不同长细比和不同横向系杆间距的竖向梯形波纹腹板PEC柱轴压试验,得到PEC柱试件在轴压作用下的破坏形态、荷载–位移关系曲线、荷载–应变关系曲线等。结果表明:所有柱的破坏失效模式具有相似性,都表现为翼缘鼓曲和混凝土压碎失效;由横向系杆、翼缘、波纹腹板组成的约束形式能够较好地约束混凝土,提高混凝土抗压强度,增强构件延性,提高变形能力;随着长细比增加,试件的初始刚度、峰值承载力均有所降低,但峰值后变形能力增强,延性较好;随着横向系杆间距的减小,试件的初始刚度、峰值荷载和延性系数均增大,试件具有更优越的轴心抗压性能。将有限元模拟结果与试验结果进行对比,在验证模型有效性的基础上,参考相关规范,结合试验结果和有限元拓展分析结果,利用叠加原理拟合得到竖向梯形波纹腹板PEC柱在轴心受压状态下的承载力计算公式。公式计算结果可靠度较高,且具有一定的安全储备,可为实际施工设计提供参考建议。
Abstract:By introducing trapezoidal corrugated steel plates into PEC columns, a new cross-section form of PEC columns was proposed to overcome the disadvantages of flat web steel plates such as low out-of-plane stiffness, easy buckling, and weak bonding with concrete. Five vertical trapezoidal corrugated web PEC columns with different slenderness ratios and different transverse tie bar spacing were tested under axial compression. By studying its bearing capacity under axial compression, the failure mode, load-displacement relationship curve and load-strain relationship curve of the specimen under axial compression load were obtained, and the law of its bearing capacity was further analyzed. The experimental study showed that the failure modes of all specimens were similar, which were compressed flange drum and concrete crushing failure. The restraint form composed of transverse tie bars, flanges and corrugated webs could better restrain concrete, improve its compressive strength, improve the ductility of members, and enhance the deformation capacity. With the increase in slenderness ratio, the initial stiffness and peak bearing capacity of the specimen decreased, but the deformation capacity after the peak increased and the ductility was better. With the decrease of transverse tie bar spacing, the initial stiffness, peak load, and ductility coefficient of the specimen increased, and the specimen had a better axial compressive performance. The finite element model was established by ABAQUS. Additionally, on the basis of verifying the validity of the finite element model and referring to the relevant codes at home and abroad, the superposition principle was used to fit and obtain the bearing capacity calculation formula of vertical trapezoidal corrugated web PEC column under axial compression combined the test results and finite element extended parameter simulation. It was found that the calculated results were in good agreement with the experimental results, which had high reliability and a certain safety reserve.
文章编号:202100425     中图分类号:TU398+.1;TU311.41    文献标志码:
基金项目:国家自然科学基金项目(51578449;51878548);陕西省自然科学基础研究计划重点项目(2022JZ–21)
作者简介:第一作者:王威(1972-),男,教授,博士.研究方向:钢与混凝土组合结构的研究.E-mail:wangwgh1972@163.com
引用文本:
王威,甄国凯,权超超,李昱,陈乐乐,蔡恒立.竖向梯形波纹腹板PEC柱轴压性能研究[J].工程科学与技术,2022,54(4):29-38.
WANG Wei,ZHEN Guokai,QUAN Chaochao,LI Yu,CHEN Lele,CAI Hengli.Bearing Performance of PEC Column with Vertical Trapezoidal Corrugated Web Under Axial Compression[J].Advanced Engineering Sciences,2022,54(4):29-38.