Examination of the Effective Coefficient of Friction for Shear Friction Design
Examination of the Effective Coefficient of Friction for Shear Friction Design
复制标题
剪切摩擦设计的有效摩擦系数检验
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
D. Meinheit
中科院分区：
文献类型：
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作者：
Kristian Krc;Samantha Wermager;L. Sneed;D. Meinheit
自从在《预制和预应力混凝土设计手册》中引入有效摩擦系数μe方法以来，已有几项研究提供了额外的试验结果，可用于比较和验证剪切摩擦设计规定。本文介绍了一个从文献中收集的剪切摩擦试验结果的数据库，该数据库分析了在《PCI设计手册》(Eq.[5-32b])和《PCI设计手册》(等式)中使用的摩擦系数方法。[5-32a])和ACI建筑规范对结构混凝土的要求(ACI 31814)和评注(ACI 318R-14)(等式[22.9.4.2])。该数据库仅限于承受单调加载且没有外法向力的推离试件。这些数据根据混凝土类型、界面条件、混凝土的抗压强度、夹持应力和剪切界面面积进行分类，以帮助确定文献中的差距。对数据库的分析表明，PCIEq.(5-32b)比这两个PCI公式更准确，标准偏差更低。(5-32a)和ACI 318-14等式(22.9.4.2)适用于具有整体未开裂、整体预裂和冷缝粗糙界面条件的常重、砂轻和全轻混凝土。对于冷连接光滑界面条件，建议去掉摩擦系数λ中的修正因子μ，以提供更准确和经济的设计。
Since the introduction of the effective coefficient of friction μe approach to the PCI Design Handbook: Precast and Prestressed Concrete, several studies have provided additional test results that can be used to compare and validate the shear friction design provisions. This paper presents a database of shear friction test results collected from the literature that was analyzed for the effective coefficient of friction approach used in the PCI Design Handbook (Eq. [5-32b]), and the coefficient of friction approach used in the PCI Design Handbook (Eq. [5-32a]) and the ACI Building Code Requirements for Structural Concrete (ACI 31814) and Commentary (ACI 318R-14) (Eq. [22.9.4.2]). The database was limited to push-off specimens subjected to monotonic loading and without external normal forces. The data were categorized in terms of concrete type, interface condition, compressive strength of concrete, clamping stress, and area of shear interface to help identify gaps in the literature. Analysis of the database showed that PCI Eq. (5-32b) is more accurate and has a lower standard deviation than both PCI Eq. (5-32a) and ACI 318-14 Eq. (22.9.4.2) for normalweight, sand-lightweight, and all-lightweight concrete with monolithic uncracked, monolithic precracked, and cold-joint roughened interface conditions. For the cold-joint smooth interface condition, the authors recommend removing the modification factor λ in the coefficient of friction μ to provide more accurate and economical designs.