Experimental on damping capacity of rubber lightweight aggregate concrete(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年03期
- Page:
- 26-33
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Experimental on damping capacity of rubber lightweight aggregate concrete
- Author(s):
- BAI Wenqi; LU Jing
- Keywords:
- -
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to quantitatively describe the influence of rubber particles on the damping capacities of lightweight aggregate concrete, cantilever beam specimens were designed by ourselves and the replacement ratio of rubber particles were set as main parameters. The change law of cubic compressive strength of rubber lightweight aggregate concrete with rubber particles replacement rate at different ages were tested. In practice, damage was widely existed in concrete during service process. The evolutionary law of basic frequency and damping ratio of rubber lightweight aggregate concrete cantilever beam at different rubber particles replacement ratio and different damage degree were detected respectively by free decay method. The influence law and mechanism of rubber particles on the damping capacities of rubber lightweight aggregate concrete were analyzed. The relationship between damping ratio, damage index and rubber particles replacement ratio of rubber lightweight aggregate concrete cantilever beam were established. The results show that the compressive strength of rubber lightweight aggregate concrete cube decreases with the increase of the replacement rate of rubber particles. The damping ratio of rubber lightweight aggregate concrete cantilever beam increases with rubber particles replacement ratio at the same damage degree. For the same rubber particles replacement ratio, the damping ratio of rubber lightweight aggregate concrete cantilever beam first increases and then decreases with increase of damage control displacement. When the damage control displacement reaches to 30 mm, the damping ratio of rubber lightweight aggregate concrete cantilever beams at each rubber particles replacement ratio reaches the maximum. The flexural dynamic stiffness damage index of rubber lightweight aggregate concrete cantilever beam augments with the increase of displacement angle. With the increase of damage index, the damping ratio of rubber lightweight aggregate concrete cantilever beam at different rubber particles replacement ratio firstly increases and then decreases. The corresponding damage index of peak damping ratio is 0.6 to 0.75. The peak damping ratio of specimens containing rubber particles is larger than that of specimens containing no rubber particles. The results can provide theoretical basis for structural design and dynamic performance analysis of rubber lightweight aggregate concrete. 3 tabs, 11 figs, 26 refs.
Last Update: 2018-06-12