预应力混凝土三角形空腹屋架构件静载试验研究

Study on Static Load Test of Components of Prestressed Concrete Triangular Fasting Roof Truss

预应力混凝土三角形空腹屋架结构体系取消传统屋架的腹杆,有利于节材节地,但是其受力性能不同于以往的屋架结构,为此,进行了两榀预应力三角形空腹屋架构件缩尺模型的静力加载试验。根据试验结果优化预应力筋的布置形式,研究分析构件破坏形态,找出构件的薄弱部位,最后给出结构设计建议。该预应力混凝土三角形空腹屋架构件包括上弦折梁和下弦拉杆。

The prestressed concrete triangular fasting roof truss canceled the traditional roof truss webs,so it is conducive to save material and land,but its mechanical behavior is different from the conventional roof truss structure. In this paper,two scale models of prestressed triangular fasting roof trusses were tested under static loads. Optimization tendons layout was given according to the test results,and weak parts of the member were identified with analysis of its failure modes. Finally, structural design recommendations were proposed. The fasting prestressed triangular concrete trusses including an upper beam and a lower rod.