Kelvin collision stiffness based on box girder model test(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年4期
- Page:
- 50-59
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Kelvin collision stiffness based on box girder model test
- Author(s):
- LI Yiqiang1; 2; ZHANG Qinyu3; WANG Xinmin1; 2
- (1. Structure Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043,Hebei, China; 2. Hebei Province Key Laboratory for Structure Health Monitoring and Control,Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China; 3. Hubei CommunicationsInvestment Intelligent Detection Co.,Ltd, Wuhan 430000, Hubei, China;)
- Keywords:
- bridge engineering; collision simulation; model test; Kelvin collision stiffness
- PACS:
- -
- DOI:
- -
- Abstract:
- Typical steel box beam crosssection and concrete box beam crosssection of nonidentical material as the prototype box beam crosssection was selected, based on the principle of equivalent stiffness, according to the similar theory of structural model test, the prototype of the flat steel box beam was simplified to the rectangular steel box beam, the single box twochamber concrete box beam prototype was simplified to the solid rectangular concrete beam, four scaled models of 1/30 concrete beam and steel box girder with the same material as the prototype beam were designed. The suspension test device was designed, the collision of concrete and concrete, steel and steel, concrete and steel three different material beam models was studied. The stiffness ratio under the collision of different models, the collision stiffness with the change of collision speed was studied. The factors of Kelvin collision stiffness influence was carried out. An empirical model for solving Kelvins collision stiffness was proposed, the value range of Kelvin collision stiffness of the experimental prototype simple concrete beam bridge was obtained. The relationship between collision stiffness and collision velocity was plotted to study the influence factors of Kelvins collision stiffness. The results show that the collision stiffness of the Kelvin collision model based on the relationship between the experimental measured force and displacement is significantly smaller than the axial stiffness value of the shorter beam, and the maximum stiffness ratio of that and the shorter beam is only 0.012 680. The Kelvins collision stiffness value is related to collision stiffness coefficient, shorter beam axial stiffness, collision velocity, neighbor beam length ratio and longer beam length. The upper and lower limits of the collision stiffness coefficients of the same type of material under the Kelvin collision model are greater than those of nonidentical materials, while the collision stiffness coefficient of the concrete or steel equivalent is smaller, and the Kelvin collision stiffness kk value of the 32 m simple girder bridge is between 4×105 to 6×105 kN/m. 2 tabs, 18 figs, 31 refs.
Last Update: 2020-07-31