Design and optimisation of a protective device for bridge piers against debris flow impact
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ORIGINAL PAPER
Design and optimisation of a protective device for bridge piers against debris flow impact Shuaixing Yan 1,2 & Siming He 1,2,3 & Dongpo Wang 4 & Yong Wu 1 Received: 8 October 2019 / Accepted: 26 March 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In Western China, a large number of bridges are located in debris flow gullies and are exposed to a great risk of damage in case of a geological disaster. To ensure the safety of the bridge and extend its service period, in this study, we propose a modular protective device for bridge piers against the impact of debris flow, especially large boulders. The device is composed of a set of independent modules in the form of a closed-cell aluminium foam-filled composite structure (AFCS) that are set at predetermined spacings and fixed by prestressed steel fasteners. The mechanical behaviour and energy absorption characteristics of five AFCS configurations were evaluated by quasi-static compression testing using both experimental and numerical modelling methods, which produced similar results. The two-layer foam-filled lattice structure AFCS05 exhibited the best comprehensive energy absorption performance, and the effects of the material and geometric parameters on the performance were investigated based on the validated finite element models. A prototype protective device based on the AFCS05 design was attached to a model bridge pier. The dynamic response of the prototype indicated that the device prolonged the impact duration and reduced the largest impact force by 84.89%, and absorbed 81.96% of the impact kinetic energy, which effectively protected the pier. The device design and production can be standardised, making it convenient for installation and on-site repair. Keywords Debris flow . Bridge pier . Aluminium foam . Composite structure . Energy absorption
Introduction With the continued development of Western China, more highways and rail lines are being planned and constructed, such as the Chengdu-Lanzhou Railway, which is an important link in the transportation network (Wang et al. 2018). The line passes through the Alpine Valley region of the transition zone between the northwest Sichuan Plateau and Sichuan Basin. The steep topography of this region is conducive to geological * Siming He [email protected] 1
Key Laboratory of Mountain Hazards and Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100081, China
4
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
disasters, such as debris flows. According to the preliminary field survey, the railway line runs through 52 debris flow gullies, among which 29 are high-risk areas. Most of the gullies are crossed by bridges, which are vulnerable to the associated threats of debris flows. Typically
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