新型弯起器研制及其对钢铰线力学性能影响Ⅱ:摩阻预应力损失  

Development of New Bending Component and Its Influence on Mechanical Property of Steel StrandⅡ: Friction Prestress Loss

作　　者：黄文雄[1,2] 谭利英 

机构地区：[1]长江大学城市建设学院,湖北荆州434023 [2]长江大学设计研究院,湖北荆州434023 [3]荆州市城市规划设计研究院,湖北荆州434000

出　　处：《公路交通科技》2013年第3期72-76,共5页Journal of Highway and Transportation Research and Development

基　　金：住房和城乡建设部科学技术项目计划(2011-K2-23);湖北省教育厅科学技术研究项目(Q20111314)

摘　　要：为了深入研究弯起器对钢绞线摩阻预应力损失的影响,在折线配筋先张梁新型弯起器研制基础之上,设计了相应试验方案,研究了采用不同导向半径R与弯折角度θ时钢绞线弯折摩阻预应力损失情况,得出R≤50 mm或R≥100 mm时弯起器弯折摩阻系数μ随R与θ变化相对平缓,而50 mm<R<100 mm时μ随着R的增大急剧减小的影响规律,并深入分析了其产生机理;同时以试验数据为基础,提出了考虑不同导向半径R影响的钢绞线弯折摩阻预应力损失统一计算公式,为折线配筋先张法预应力混凝土先张梁的深入研究与推广应用提供了设计依据与试验数据支持。In order to research the friction prestress loss of steel strands caused by bend component, the experiment scheme is designed based on the development of a new bend component for polyline pretensioned beam （PPSCB）. The regularity and mechanism of prestress loss due to friction affected by radius R and bending angle θ are analyzed. The result shows that the variation trend of fraction coefficient μ is relatively gentle when R≤50 mm or R ≥ 100 mm, but sharply reduced when 50 mm 〈 R 〈 100 mm. The generation mechanism of this influence is discussed. In addition, the uniform calculating formulas of friction prestress loss of steel strands is presented based on experiment data, which takes the affection factor R into account. It provides design basis and experiment data for further research and application of polyline pretensioned beams.

关 键 词：桥梁工程 折线配筋先张梁 钢绞线 试验 弯起器 摩擦系数 预应力损失 

分 类 号：TU448.35[建筑科学—岩土工程] TU757.13[建筑科学—土工工程]