摘要
为了研究混凝土强度等级、预应力筋预应力值以及管廊侧壁厚度等因素对预制预应力综合管廊预应力筋接头抗弯性能的影响,进行了预制预应力综合管廊预应力筋连接接头试件单调静力加载试验,并采用有限元模型分析了混凝土强度、预应力筋预应力值、侧壁厚度对接头受力性能的影响。试验结果表明:接头的抗弯刚度和抗弯承载力随混凝土强度的增大而增大,接头变形量随之减小;增大预应力筋的预加应力可提高接头的消压弯矩,使接头的极限变形能力减小;接头的消压弯矩、抗弯刚度和抗弯承载力都随着侧壁厚度的增大而增加。最后,结合相关规范和工程实际,针对各参数取值给出了合理的建议。该研究结果可为预应力筋连接预制拼装管廊接头设计提供参考和借鉴。
In order to study the influence of concrete strength,prestress value of tendonsand side wall thickness of pipe gallery on the flexural performance of prestressed tendons joint of precast prestressed pipe gallery,a monostatic static loading test was carried out on the test piece.The influence of concrete strength,prestress value of tendons and side wall thickness of pipe gallery on the mechanical properties of jointwas analyzed by finite element model.The experimental results show that the flexural stiffness and ultimate bearing capacity of joints increase with the increase of concrete strength,but the joint deformation reduce.Increasing the prestress value of tendons can improve the pressure relieving moment of the joint and reduce the ultimate deformation capacity of the joint.All the compression relief moment,flexural stiffness and flexural capacity of the joint increase with the thickness of the side wall.Finally,based on relevant specifications and engineering practices,reasonable suggestions are given for the value of each parameter.The research results can provide reference for the design of prestressed tendons connection prefabricated assembled pipe gallery joint.
作者
周静
夏樟华
陈树辉
许有胜
Zhou Jing;Xia Zhanghua;Chen Shuhui;Xu Yousheng(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Jianyan Testing Group Co.,Ltd.,Xiamen 361004,China;Shenzhen Municipal Engineering Design Institute,Shenzhen 518035,China)
出处
《市政技术》
2022年第3期153-161,172,共10页
Journal of Municipal Technology
基金
福建省自然科学基金项目(2020J01477)
福州市科技成果转移转化项目(2020-GX-18)
厦门市建设局科技项目(XJK2020-1-8,XJK-2021-1-19)。
关键词
综合管廊
预制拼装
抗弯性能
有限元
接头
预应力筋
utility tunnel
precast assembled
flexural performance
finite element
joint
prestressed tendons
