单折线体外索对简支钢梁自振频率的影响  

Effect of fold-line tendons on natural frequency of simply supported steel beams

作　　者：王飞[1] 李红明[2] 唐柏鉴[1,3] 陈淞 WANG Fei;LI Hongming;TANG Baijian;CHEN Song(School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;School of Civil Engineering and Architecture,Jiangsu University of Science and Technology,Zhenjiang 212003,China;School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]江苏科技大学船舶与海洋工程学院,镇江212003 [2]江苏科技大学土木工程与建筑学院,镇江212003 [3]苏州科技大学土木工程学院,苏州215009

出　　处：《江苏科技大学学报（自然科学版）》2020年第1期105-110,共6页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：住建部科学技术计划项目(2016-K5-049);江苏省高校自然科学基金研究面上项目(15KJB560004)。

摘　　要：结构的自振特性关系到结构的健康安全,预应力系统作用到结构上会影响结构的自振频率.为考察体外预应力索系统对简支钢梁自振频率的影响,基于预应力系统作用机理并采用能量法建立了单折线布索型预应力钢梁的动力方程,求解此方程得到自振频率的计算公式,用此公式对一典型单折线索钢梁的一阶频率进行了计算,并与有限元模拟结果进行对比.结果表明:公式计算结果与有限元模拟结果基本一致,可用于工程设计.在此基础上,还得到了索预拉力、偏心距和截面积对梁自振频率的影响规律,为调节单折线布索型预应力钢梁的自振频率提供了理论依据.The dynamic property of structures is directly related to their health and safety.The prestressing system applied on structures will affect their natural frequency.To investigate the influence of the external prestressing system on natural frequencies of the simply supported steel beam,based on the prestressing mechanism,the energy method was used to establish the bending vibration equation for the prestressed beam.The theoretical formula for natural frequencies of a prestressed beam with fold-line tendons was derived.This formula was used to calculate the first natural frequency of a typical steel beam with fold line tendons and the results were verified by the finite element simulation.The calculation results are found in agreement with the finite element results and can be used in engineering design.Moreover,the laws of influence of the pretension,eccentricity and cross-sectional area of the tendons on natural frequencies of the prestressed steel beam are revealed as a theoretical basis for adjusting the natural frequency of fold-line type prestressing steel beams.

关 键 词：预应力钢梁 体外预应力索 动力性能 自振频率 有限元法 

分 类 号：TU394[建筑科学—结构工程]