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首页> 外文会议>International Symposium on Role of Concrete Bridges in Sustainable Development; Sep 3-4, 2003; University of Dundee, Scotland, UK >STRESS DISTRIBUTION AROUND TENDON COUPLING JOINTS IN PRESTRESSED CONCRETE GIRDERS
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STRESS DISTRIBUTION AROUND TENDON COUPLING JOINTS IN PRESTRESSED CONCRETE GIRDERS

机译：预应力混凝土梁中筋连接节点周围的应力分布

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摘要

The purpose of this paper is to investigate the complicated stress behavior around the tendon coupling joints in prestressed concrete (PSC) girders. To this end, a comprehensive experimental program has been set up and a series of test members have been tested to identify the effects of tendon coupling. The present study indicates that the longitudinal and transverse stress distributions of PSC girders with tendon couplers are quite different from those of PSC girders without tendon couplers. It can be seen that the longitudinal compressive stresses in concrete introduced by prestressing are decreased by about 35 percent in the vicinity of tendon coupling joints for the coupling ratio of 50 percent and this reduction of compressive stresses reaches up to 70 percent around the coupling joint of folly coupled members. This large reduction in compressive stresses may cause serious cracking in PSC girder bridges, due to an increase in tensile stresses when shrinkage and temperature effects are superimposed on live loads. Results obtained by finite element analysis correlate very well with test data on the complex strain distributions of tendon coupled members.
机译：本文的目的是研究预应力混凝土（PSC）大梁中筋耦合接头周围的复杂应力行为。为此，已经建立了全面的实验程序，并测试了一系列测试成员以识别肌腱耦合的影响。目前的研究表明，带筋耦合器的PSC大梁的纵向和横向应力分布与不带筋耦合器的PSC大梁的纵向和横向应力分布有很大不同。可以看出，在预应力引入的混凝土中，在钢筋联接节附近，纵向压缩应力在50％的联接率下降低了约35％，这种压缩应力的降低在钢筋混凝土联接节周围达到了70％。愚蠢的成员。压缩应力的这种大幅度降低可能会导致PSC箱梁桥严重开裂，这是因为当收缩率和温度效应叠加在活荷载上时拉伸应力会增加。通过有限元分析获得的结果与关于筋耦合构件的复杂应变分布的测试数据非常相关。

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