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体外预应力结构是一种由体外索和普通结构组成的预应力组合结构,被广泛地应用在各类结构中。基于体外预应力索与梁耦合振动的振动特性,建立体外预应力梁振动模型,推导出了不同体外预应力束线型等直线弹性梁的自振频率方程。在体外预应力钢束混凝土梁电磁激振器扫频试验中,测试了不同预应力条件下梁的基频。理论和试验研究表明体外预应力束线型、预应力束拉伸刚度和梁振型模态对梁自振频率的影响是明显的。
External prestressed structure is a prestressed composite structure composed of extra-corporeal cable and common structure, which is widely used in various structures. Based on the vibration characteristics of externally prestressed cable and beam coupled vibration, the vibration model of externally prestressed beam was established and the natural frequency equations of different linear elastic beams with prestressing force in vitro were deduced. In the swept-frequency test of externally prestressed steel beam concrete beam electromagnetic exciter, the fundamental frequency of the beam under different prestressing conditions was tested. Theoretical and experimental studies show that the influence of external prestressing force, prestressing force and beam mode on the natural frequency of the beam are obvious.