Department of Transportation Engineering, School of Civil Engineering, Shandong University, Jinan 250061, China;
Department of Transportation Engineering, School of Civil Engineering, Shandong University, Jinan 250061, China;
Department of Transportation Engineering, School of Civil Engineering, Shandong University, Jinan 250061, China;
Department of Civil, Environment, and Construction Engineering, Texas Tech University, TX 79409-1023, USA;
Department of Transportation Engineering, School of Civil Engineering, Shandong University, Jinan 250061, China;