Advanced Steel Construction

Vol. 14, No. 3, pp. 479-495(2018)


A NEW NUMERICAL MODELLING APPROACH FOR

FLEXIBLE ROCKFALL PROTECTION BARRIERS

BASED ON FAILURE MODES

 

X. Qi1, Z.X. Yu2*, L. Zhao3, H. Xu4 and S.C. Zhao5

1Lecturer, School of Civil Engineering, Southwest Jiaotong University, Chengdu, China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China

2Associate Professor, School of Civil Engineering, Southwest Jiaotong University, Chengdu, China

3Reseacher Fellow, Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China

4Lecturer, School of Civil Engineering, Southwest Jiaotong University, Chengdu, China

5Professor, School of Civil Engineering, Southwest Jiaotong University, Chengdu, China

*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)

Received: 15 August 2017; Revised: 3 September 2017; Accepted: 18 November 2017

DOI:10.18057/IJASC.2018.14.3.10

 

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ABSTRACT

To study the mechanical behaviour of the flexible rockfall protection barriers under impact load, four full-scale impact tests involving protection capacities of 750 kJ and 2000 kJ were conducted, including two successful and two failed tests. The experimental results show that the system has three working stages. Among these three stages, the second and the third stages play significant roles in both absorbing the impact energy and ensuring the system performance reasonable. Based on the observed failure modes in the tests, the key factors leading to the breakdown of the system are investigated. A new numerical modelling approach is established, which is able not only to predict the capacity of the flexible protection barrier subjected to the rockfall impact but also to accurately simulate the main failure modes such as buckling of the steel post and breakage of the rope. The experimental results are employed to assess and verify the calculation model, and the numerical responses of the system are in good agreement with the test data. Furthermore, a flexible rockfall protection barrier with a capacity of 5000 kJ is designed by using the numerical procedure as an effective tool, shown by a full-scale impact test.

 

KEYWORDS

Rockfall protection barrier, full-scale testing, finite element model, dynamic response, failure mode


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