1. Formerly University of Dundee, Dundee, UK; now Department of Architecture and Civil Engineering, University of Bath, Bath, UK.
2. School of Science and Engineering, University of Dundee, Dundee, UK.
3. Formerly University of Dundee, Dundee, UK; now Center for Hypergravity Experimental and Interdisciplinary Research, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang, P. R. China.