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首页> 外文会议>SP-228; International Symposium on Utilization of High-Strength/High-Performance Concrete vol.1; 20050620-24; Washington,DC(US) >Prestress Losses in Pretensioned Girders Part Ⅱ: Experimental Program
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Prestress Losses in Pretensioned Girders Part Ⅱ: Experimental Program

机译：预应力梁的预应力损失第二部分：实验程序

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摘要

Prestress loss estimation is required for properly assessing concrete stresses and member deformation. Earlier methods of prestress loss prediction were based on relatively low concrete strength. Their use for high strength concrete can produce significant errors due to their inability to accommodate varying material properties. Another source of error for earlier methods is that they do not adequately address the interaction between precast concrete members and cast-in-place composite topping. This paper presents the results of the research work conducted by Tadros et al. in the National Cooperative Highway Research Program (NCHRP) 18-07 study on prestress losses in high strength concrete which have been adopted by the American Association of State Highway and Transportation Officials, Load and Resistance Factor Design, AASHTO LRFD Specifications for inclusion in the 2005 Edition. This is the second part of a two parts paper. Part Ⅰ described the development of the new methods that were applicable to conventional and high strength concrete ranging from 4 to 15 ksi (28 to 103 MPa). This Part Ⅱ deals with the experimental program of prestress losses in seven full-scale bridge girders. These girders are in four different states; Nebraska, New Hampshire, Texas and Washington that represent four different regions. Previously reported measurements of thirty-one pretensioned girders in seven different states are also examined.
机译：需要预应力损失估算才能正确评估混凝土应力和构件变形。较早的预应力损失预测方法是基于较低的混凝土强度。由于无法适应各种材料特性，将其用于高强度混凝土可能会产生重大错误。早期方法的另一个错误来源是，它们无法充分解决预制混凝土构件与现浇复合材料浇顶之间的相互作用。本文介绍了Tadros等人进行的研究工作的结果。在美国国家公路合作研究计划（NCHRP）18-07中对高强度混凝土中的预应力损失进行了研究，该研究已由美国国家公路和运输官员协会采用，荷载和阻力系数设计，AASHTO LRFD规范被纳入2005年版。这是两部分纸的第二部分。第一部分描述了适用于4至15 ksi（28至103 MPa）的常规和高强度混凝土的新方法的发展。第二部分介绍了七个全尺寸桥梁的预应力损失的试验程序。这些大梁处于四个不同的状态。内布拉斯加州，新罕布什尔州，德克萨斯州和华盛顿州分别代表四个不同的地区。还检查了先前报道的在七个不同状态下的三十一个预应力大梁的测量结果。

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