1. School of Civil and Hydraulic Engineering; Dalian University of Technology; Dalian Liaoning 116024 China
2. Institute of Road and Bridge Engineering; Dalian Maritime University; Dalian Liaoning 116024 China
3. School of Civil Engineering; Shenyang Jianzhu University; Shenyang Liaoning 110168 China
4. Department of Mechanical Engineering; University of Houston; Houston TX 77204 USA