Analysis of dynamic characteristics and seismic performance of Vshapedouble steel arch cablestayed bridge with cable damage(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年2期
- Page:
- 114-124
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Analysis of dynamic characteristics and seismic performance of Vshapedouble steel arch cablestayed bridge with cable damage
- Author(s):
- HUANG Hua; BAI Hao; ZHOU Wenjie; GUO Peng; YANG Kun
- (School of Civil Engineering, Changan University, Xian 710061, Shaanxi, China)
- Keywords:
- bridge engineering; Vshaped double steel arch tower cablestayed bridge; finite element simulation; cable fracture; damage mechanism; dynamic performance
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the dynamic characteristics and seismic performance of a doublesteel arch tower cablestayed bridge under the action of cable damage, Fenghe Bridge on Fuyu Road in Xian was used as an engineering background, and its threedimensional FEM model was established by the software MIDAS/Civil. The influence of different positions and different numbers of cable breaks on the dynamic performance of the bridge were studied, and the changes in the line shape of the main beam, the cable force, the stress of the main beam and the tower were analysed when the earthquake and the broken cable act simultaneously. The results show that singlecable rupture reduces the natural frequency of the bridge very little, with the maximum value being only 5.12%. Outer stay cables or horizontal cable breaks have a greater impact on the dynamic characteristics of the bridge than the inner stay cables or horizontal cable breaks. The change value of the bridge natural frequency and the remaining cable force when the double cable breaks is approximately the sum of the corresponding changes when the two cables break separately, which is in line with the superposition principle. Under the action of an earthquake, when two dangerous cables break at the same time, the maximum remaining cable force does not meet the requirement that the cable safety factor is not less than 2.5 in the specification Design rules for highway cablestayed bridges (JTG D[STBX]6501—2007)[STBZ], measures it should be taken to strengthen, or it is advisable to calculate the stress less than 0.28fpk to ensure that the safety factor is within the specified range of the code, thereby ensuring the safety of the bridge structure. The change rate of bridge natural frequency and the degree of cable corrosion damage are basically linear. The effect of vertical seismic action on the remaining cable force is higher than that of horizontal seismic action, and the impact of broken cables on the bearing capacity of the remaining cables is greater than the impact on the main beams and pylons. The conclusions obtained can provide a certain reference for the design and later maintenance of this type of bridge cable system. 4 tabs, 10 figs, 26 refs.
Last Update: 2021-04-02