缓粘结混合配筋预应力混凝土梁裂缝宽度的试验研究  

Experimental research on crack width of retard-bonded partially prestressed concrete beams with mixed reinforcement

作　　者：张建玲[1] 宋玉普[2] 

机构地区：[1]中国建筑科学研究院,北京100013 [2]大连理工大学,辽宁大连116024

出　　处：《土木工程学报》2008年第2期54-59,共6页China Civil Engineering Journal

摘　　要：研究缓粘结预应力筋张拉时的静张拉摩阻力、偏差系数κ和摩擦系数μ。通过18根缓粘结混合配筋预应力混凝土梁的试验研究,分析影响裂缝宽度的主要因素,得到了在静载、等幅以及变幅疲劳荷载作用下缓粘结混合配筋预应力混凝土梁的最大裂缝宽度和平均裂缝宽度的发展规律,得到了最大裂缝宽度和平均裂缝宽度之间的关系。在试验研究的基础上,建立了疲劳荷载作用下缓粘结混合配筋预应力混凝土梁最大裂缝宽度的计算公式,建议了预应力损失的计算方法。计算结果与试验结果吻合较好,为经济可靠,安全合理的设计和验算混合配筋预应力混凝土梁提供了依据。In this paper, static friction drag, change factor k and friction factor μ are obtained from the test in which retard-bonded prestressed strands in 18 retard-bonded partially prestressed concrete T-beams with mixed reinforcement are tensioned. The main influencing factors for crack width are investigated,and the development process for curve of maximum and average crack width under static loading, constant-amplitude and variableamplitude fatigue loading is obtained from the test results. The relationship between maximum and average crack width is obtained synchronously. Based on the test results, calculation formulas on maximum crack width of a retard- bonded P.P.C beam with mixed reinforcement under static and fatigue loading are given,and the calculation method for prestressing loss is recommended. The calculating results are matched with the test results quite well. It provides theoretical references for design and calculation of P.P.C beams with mixed reinforcement economically and safely.

关 键 词：缓凝砂浆 缓粘结混合配筋预应力混凝土梁 张拉摩阻力 裂缝宽度 

分 类 号：TU317[建筑科学—结构工程] TU378