预应力对预应力简支梁自振频率的影响

Prestress Force Effect on Natural Frequencies of Simply Supported Prestressed Beams

建立了有粘结预应力简支梁振动特性的理论分析模型,并研究了预应力大小对不同布索形式的预应力简支梁自振频率的影响;应用有限元分析软件ANSYS对三种布索形式的预应力简支梁进行了模态分析,验证了理论分析的正确性与适用性;理论分析模型和有限元模型分别从理论和数值上证明了预应力大小对有粘结预应力简支梁的动力特性没有任何影响。

An analytical model was formulated for the dynamic characteristics of a simply supported prestressed beam with bonded tendons. The effect of the magnitude of the prestress force on the natural frequencies of prestressed beams with any arbitrary cable layout was presented. Modal analyses of simply supported beams with three different cable layouts were carried out using the FEA software ANSYS, which verified the accuracy and universality of the proposed analysis. The analytical model and finite element model have theoretically and numerically proved that the magnitude of the prestress force does not affect the dynamic characteristics of simply supported bonded prestressed beams.