摘要
针对铁路提速后预应力混凝土简支Ⅱ形梁横向刚度不足的问题,以某40m预应力混凝土简支Ⅱ形梁为研究对象,系统分析了横隔板的位置、数量和厚度对梁体自振基频的影响。研究结果表明:横隔板的位置、数量对梁体的竖向自振频率影响不大,但不同横隔板布置方式对梁体的横向自振频率影响较为显著,梁端横隔板比跨中横隔板对梁体的横向自振频率影响更显著;随着横隔板厚度的增加,横向自振频率增加而竖向自振频率减小。利用分析结果,本文计算分析了不同横隔板的加固组合方式,确定了两侧梁端各3块横隔板加厚至0.7m为该桥横向刚度的最优加固方案。
Aimed at the situations of stiffness shortage of simple--supported Ⅱ type prestressed concrete beam after the train speed boosted,this paper takes certain 40 meters span simple--supportedIItype prestressed concrete beam as research object and analyses the influence of different cases of location,thickness and number of diaphragm--plate to fundamental frequency of natural vibration.The results of analysis show that the influence of diaphragm--plate location and number to fundament vertical frequency of natural vibration are little,but different combination cases of diaphragm--plate have great effect on fundamental transverse frequency of natural vibration,diaphragm--plate at beam end are more significant than that of beam middle. With the diaphragm-plate thickness adds,the fundamental transverse frequency of natural vibration increases,while frequency of natural vertical vibration decreases. By the use of these results,different cases of reinforced diaphragm--plate scheme are analyzed and each beam end of 3 diaphragm-plate thickness reinforced to 0.7 meters is ensued as the optimum scheme.
出处
《科技创新导报》
2009年第30期44-46,共3页
Science and Technology Innovation Herald
关键词
简支Ⅱ形梁
横隔板
动力特性
加固
Simple-SupportedⅡType Beam
Diaphragm-Plate
Dynamic Characteristic
Reinforced
