折线配筋先张梁弯起器所致预应力损失试验与仿真研究  

Experimental and simulation study on prestress loss caused by the bending device of prestressed tendons using the pre tensioning method

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作  者:谢昕 陈清波 安正斌 朱潇钰 沈杰 姚蔚 徐丰[3] XIE Xin;CHEN Qingbo;AN Zhengbin;ZHU Xiaoyu;SHEN Jie;YAO Wei;XU Feng(China Coal Geology Hubei Geological Survey Foundation Engineering Co.,Ltd.,Wuhan 430074,Hubei,China;China Coal Hubei Geological Bureau Group Co.,Ltd.,Wuhan 430074,Hubei,China;Wuhan Institute of Technology,Wuhan 430205,Hubei,China)

机构地区:[1]中煤湖北地质勘察基础工程有限公司,湖北武汉430074 [2]中煤湖北地质局集团有限公司,湖北武汉430074 [3]武汉工程大学,湖北武汉430205

出  处:《矿产勘查》2024年第S2期133-139,共7页Mineral Exploration

摘  要:折线配筋先张梁是一种新型的预应力混凝土梁,目前已在桥梁工程中开始应用。其较好的受力方式解决了直线先张梁跨度较小的不足,既保留了先张法的优点,又避免了后张法中诸多技术难题,能够有效地降低梁端的主拉应力,提高构件的耐久性和抗剪能力。折线配筋先张梁制作过程中,弯起器是关键构件之一,本文结合某环线工程,研究弯起器在钢绞线张拉中引起的预应力损失,进行了折线先张梁弯起器预应力损失试验,通过Workbench有限元软件对弯起器受力性能进行三维仿真参数化分析,为折线配筋先张梁弯起器的工程应用提供参考和数据支持。The pre-tensioned beam with folded-line reinforcement is a novel type of prestressed concrete beam and has been employed in bridge engineering currently.Its superior force-bearing pattern addresses the deficiency of the small span of the straight-line pre-tensioned beam.It not only retains the merits of the pre-tensioning method but also circumvents numerous technical predicaments in the post-tensioning method,effectively reducing the principal tensile stress at the beam end and enhancing the durability and shear resistance of the component.During the manufacturing process of the pre-tensioned beam with folded-line reinforcement,the bender is one of the key components.To explore the prestress loss induced by the bender during the tensioning of the steel strand,this paper,in combination with a certain ring road project,conducts a prestress loss test of the bender of the pre-tensioned beam with folded-line and undertakes a simulation study on the mechanical performance of the pulley-type bender via the Workbench finite element software,providing references and data support for the engineering application of the bender of the pre-tensioned beam with folded-line reinforcement.

关 键 词:折线先张 弯起器 仿真分析 预应力损失 

分 类 号:U448.35[建筑科学—桥梁与隧道工程]

 

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