Fucai Pei and Ranran Hu
Shandong Luqiao Group Co., Ltd, Shandong, China
Cable-stayed Bridge got rapidly developed in designing and constructing during these decades. Concrete cable-stayed bridge [1-6] occupies larger proportion. Tall cable towers’ cracking behavior has aroused more and more attention from the researchers. Under the outer load, temperature load, concrete shrinkage and creep effect, tower of concrete cable-stayed bridge suffers huge pressure transmitted by cables. According to incomplete statistics, tower fracture occurs in 80% of the Chinese cable bridges, it seriously affects the cable-stayed bridge’s safety and even people's life. This article introduced the fractal damage and the fractal fracture mechanics into safety assessment of cable-stayed bridge’s cable tower. Then, tall tower’ safety state evaluation model is put forward based on fracture distribution in this paper Beginning and expansion of fractures and the structure failure process are analyzed from the macroscopic and mesoscopic point of view through theoretical analysis. This paper set up a new method supported by the theory of fractal damage for evaluation of cable tower safety state after cracking occurs. The relationship between the load level and fractal dimension of fracture distribution after the cable tower cracking occurs is researched and it provides theoretical and experimental basis to further application to real bridge. The following mainly innovative work has been done in this paper.
Cable-stayed Bridge, Non-homogeneous Materials, Microscopic Structures, Particle Flow
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