2016 3 3 210 Mar 2016 JOURNAL OF RAILWAY ENGINEERING SOCIETY NO. 3 Ser. 2016 210 3 1006-2106 2016 03-0060 - 05 PC 1 2 1 1 1. 7070 2. 410082 PC PC 1 10 3 + 3 m PC ANSYS 1 PC 2 JTG D60 2015 3 PC 4 PC U448. 21 + 6 A Dynamic Characteristics Analysis of the Variable Cross - section Continuous Box Girder Bridge with Corrugated Steel Webs JI Wei 1 DENG Lu 2 LIU Shi - zhong 1 LIN Peng - zhen 1 1. Lanzhou Jiaotong University Lanzhou Gansu 7070 China 2. Hunan University Changsha Hunan 410082 China Abstract Research purposes In order to study the dynamic characteristics of the PC box girder bridge with corrugated steel webs CSWs with variable cross - section the bridge model with the span 3 + 3 m used in the experiment testing is a one - to - ten scale model developed for the Juancheng Yellow River Bridge. The model test and ANSYS finite element simulation are used to study the dynamic characteristics of the PC continuous box girder bridge with CSWs with variable cross - section. Research conclusions The results show 1 The number of diaphragm has great influences on the torsional vibration frequencies of this type bridge while has little influences on the vertical bending vibration frequencies. 2 The fundamental frequency formulas from the JTG D60-2015 code for the continuous girder are used to calculate the PC box girder bridge with CSWs with variable cross - section. The measured values and FEA values have big differences with the JTG D60-2015 code values so vertical fundamental frequency formulas of the continuous girder in current code are 2015-09 - 14 51368032 51208242 2014M562103 IRT - 15R29 2015A - 053 1506RJIA029 1982
3 PC not suitable for this kind of bridge. 3 Considering the shear deformation of the CSWs the correction formulas are obtained for the PC box girder bridge with CSWs with variable cross - section. 4 The research conclusions can provide references for the analysis of dynamic characteristics of variable cross - section PC continuous box girder bridges with CSWs in highway bridge engineering. Key words corrugated steel web composite box girder variable cross - section dynamic characteristic model test 61 PC - PC 1 PC PC 1 PC 横隔板混凝土顶板 PC 波形钢腹板 1 10 混凝土底板体内预应力筋 2 3 3 + 3 m 体外预应力筋 1. 35 m 0. 65 m 1 PC 0. 35 m C40 32. 5 GPa 0. 2 2 550 kg /m 3 Ⅰ Q235 1. 2 mm 1-4 PC 4 210 GPa PC 0. 3 7 800 kg /m 3 5 1 PC 6 650 PC 7 PC 2 mm 8 1 PC PC PC 650 3 mm 5 5 50 25 25 200
62 2016 3 200 1.2 43 37 43 37 43 4 22 mm 1 080 960 960 220 3 000 270 150 50 100 5 mm 2 7 5 1860 139 mm 2 2 8 160 kn 9 6 ANSYS 9 PC ANSYS12. 0 PC SOLID45 1. 2 mm SHELL63 LINK8 PC PC SHELL63 SOLID45 3 cm 8 6 2 DHDAS 7 3 1 1 6 000 1 500 1 500 1 500 1 500 7 mm 675 9 1 ANSYS
3 PC 63 1 13. 616 EI c f ANSYS 1 = mc /Hz /Hz 1 49. 44 50. 85 23. 651 EI c f 2 = 2 65. 48 65. 81 mc 3 115. 54 125. 12 l 3 3. 1 m c PC PC 1 f 1 2 2 PC /Hz /Hz f 1 /Hz 10 1 49. 44 50. 85 73. 57 频率 /Hz 120 90 60 0 注 : 竖向一阶弯曲振动频率 ; 竖向二阶弯曲振动频率 ; 扭转振动频率 JTG D60 2015 10 1 PC DHDAS ANSYS 2 1 2 PC f 1 PC f 2 1 2 E I c 2 JTG D60 2015 PC 方案 1 方案 2 方案 3 方案 4 13. 616 EI c f 11 = m / 1 + EI 2 c π c G s A s ( ) 3 l 10 G s 10 A s PC 3 52. 176 Hz 2 23. 651 EI c f 12 = m / 1 + EI 2 c π c G s A s ( ) 4 l 3. 2 4
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