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关于预应力筋锚固区的荷载传递试验——预应力锚固区安全探讨之二
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(中国建筑科学研究院 北京 100013)

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裴彇

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TU378

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Load transfer test of prestressed reinforcement anchorage zone -- Discussion on safety of prestressed anchorage zone II
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(China Academy of Building Research, Beijing 100013)

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    摘要:

    预应力筋锚固区的承载能力如何确定,是中外业界长久以来十分关注的问题,国外的技术标准要求采用对试件加压力的试验方法进行验证,中国的惯例是混凝土结构以内的埋入件及抗裂钢筋由结构设计者负责设计,结构以外的锚具由锚具制造者负责达到标准。但整套的夹片式锚具却包含了结构体外的锚具和用于结构体内的配套零件,形成了分管不清的局面。从2010年10月起,中国的行业标准JGJ85-2010《预应力筋用锚具、夹具和连接器应用技术规程》首先提出在进场验收锚具时,如果锚垫板是铸造型的,锚具生产厂应进行锚固区传力性能试验,结构设计方认为锚固区传力性能不能满足要求时也可能进行这项试验,该标准与美国后张预应力学会(PTI)的验收标准基本一致。2011年3月中国交通部发布了《公路桥梁预应力钢绞线用锚具、夹具和连接器》(JT/T329-2010)行业标准,要求锚下垫板的构造尺寸应能将预应力可靠地从锚具传递到混凝土构件中。该标准的规定与FIP1993关于荷载传递试验要求基本相同。但是中国的业界对"荷载传递试验"比较陌生,不太了解如何进行这项试验。今后的国内外工程(如高铁、高速),特别是国外用户可能要求锚具生产厂提供此项试验证明,锚具生产方和结构设计方都需要直面应对。本文就是在这种形势下汇总了国内外的试验概念、试件制作、试验方法和要求,给业内人员提供一个概括的资讯。

    Abstract:

    How to determine the bearing capacity of the prestressed reinforcement anchorage area is a problem that has long been of great concern to the domestic and foreign industry. Foreign technical standards require the test method of applying pressure to the test pieces to verify. In China, the practice is that the embedded parts and anti-cracking steel bars within the concrete structure are designed by the structural designer, and the anchors outside the structure are designed by the anchor manufacturers. However, the whole set of clip-type anchors contains the anchors outside the structure and the supporting parts in the structure, resulting in an unclear situation. Since October 2010, China's industry standard JGJ85-2010 "Technical Regulations for the Application of anchors, fixtures and connectors for prestressed tendons" first proposed that when entering the acceptance of anchors, if the anchor plate is cast, the anchor manufacturer should conduct the force transfer performance test in the anchoring area, and the structural designer believes that the force transfer performance of the anchoring area can not meet the requirements The test results show that the standard is basically consistent with the acceptance standard of the American Post-tensioning Prestressing Institute (PTI). In March 2011, the Ministry of Communications of China issued the industry standard "Anchors, fixtures and Connectors for Prestressed steel strand wires of Highway Bridges" (JT/T329-2010), requiring that the structural size of the anchor plate should be able to reliably transfer prestress from the anchor to the concrete member. The requirements of this standard are basically the same as those of FIP1993 on load transfer test. However, the Chinese industry is relatively new to the "load transfer test" and does not know much about how to conduct this test. In the future, domestic and foreign projects (such as high-speed rail, high-speed), especially foreign users may require anchor manufacturers to provide this test proof, and anchor manufacturers and structural designers need to face up to it. In this situation, this paper summarizes the test concepts, specimen production, test methods and requirements at home and abroad to provide a general information for the industry.

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Xiao Pei, Ying Zhu, Qian Chen, Chengshun Zhou, Li Zeng Load transfer test of prestressed reinforcement anchorage zone -- Discussion on safety of prestressed anchorage zone II. Prestress Technology 2012,16(02):14-20. 10.59238/j. pt.2012.02.004

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  • 在线发布日期: 2023-08-06
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