钢筋砼的锚固可靠度及锚固设计

本文给出了各种常用钢筋的锚固极限状态方程。在此基础上,根据我国钢筋、砼材料和构件几何尺寸的统计参数,按照所确定的锚固强度和锚固刚度可靠指标,求得了各种情况下所需的钢筋锚固、搭接和延伸长度。本文分析了现行规范的锚固可靠度水平和主要影响因素,最后提出了可靠度比较一致的、简单实用的关于锚固、搭接和延伸长度设计取值的建议,为工程设计提供了依据。

The Reliability and Design for Anchorage of Reinforcing Bars

In this paper the limit state equations for anchorage of commonly used reinforcing bars are presented.On this basis, according to the given reliability indices of strength and rigidity of anchorage, the required anchorage,lap and extended length of bars of all kinds under any cases could be obtained respectively by using the statistical parameters of the properties of materials and the geometrical sizes of reinforced concrete members evaluated in China. Meanwhile, the level of reliability for anchorage of bars based on the current Code in China and the principal factors, which influence the reliability for anchorage are analyzed.Finally, a proposal concerning the design values for anchorage, lap and extended length of bars of all kinds, which are simple, practical and with relatively consistent level of reliability,are provided as the basis for engineering practice.