1. Professor, School of Transportation Engineering, Shenyang Jianzhu Univ., No. 25, Hunnan Middle Rd., Hunnan District, Shenyang 110168, Liaoning, P.R. China (corresponding author).
2. Graduate Student, School of Civil Engineering, Shenyang Jianzhu Univ., No. 25, Hunnan Middle Rd., Hunnan District, Shenyang 110168, Liaoning, P.R. China.
3. Doctoral Candidate, School of Civil Engineering, Shenyang Jianzhu Univ., No. 25, Hunnan Middle Rd., Hunnan District, Shenyang 110168, Liaoning, P.R. China.