Atrek, E. (1984). New directions in optimum structural design, A Wiley-Interscience Publication, pp. 12-35.Atrek, E. (1984). New directions in optimum structural design, A Wiley-Interscience Publication, pp. 12-35.

Gwangju City (1997). Construction cost sheet of Gwangju subway 1st-1 construction 1-4 zone civil design engineering, pp. 250-310 (in Korean).Gwangju City (1997). Construction cost sheet of Gwangju subway 1st-1 construction 1-4 zone civil design engineering, pp. 250-310 (in Korean).

Gwangju City (2000). Construction cost sheet of Gwangju subway 1st-2 construction 1-9 zone civil design engineering, pp. 220-256 (in Korean).Gwangju City (2000). Construction cost sheet of Gwangju subway 1st-2 construction 1-9 zone civil design engineering, pp. 220-256 (in Korean).

Jeong, J. P., Kim, D. J., Kim, H. J., Lee, K. R. and Choe, S. W. (2014). “Reinforced concrete by 2012 refined concrete structural design code.” Goomibook, pp. 32-82 (in Korean).Jeong, J. P., Kim, D. J., Kim, H. J., Lee, K. R. and Choe, S. W. (2014). “Reinforced concrete by 2012 refined concrete structural design code.” Goomibook, pp. 32-82 (in Korean).

Jeong, J. P., Kim, D. J., Mo, G. S., Lee, S. H. and Kim, W. (2000). “Practical method for determination of optimal steel ratio in RC flexural members.” 2000 Fall Conference Journal of Korea Concrete Institute, pp. 259-264 (in Korean).Jeong, J. P., Kim, D. J., Mo, G. S., Lee, S. H. and Kim, W. (2000). “Practical method for determination of optimal steel ratio in RC flexural members.” 2000 Fall Conference Journal of Korea Concrete Institute, pp. 259-264 (in Korean).

Jeong, J. P., Ryu, H. J. and Kim, W. (2012). “Practical method for determination of optimal steel ratio in subway RC flexural members with low fill height.” 2012 Conference Journal of Korea Society of Civil Engineering, pp. 191-194 (in Korean).Jeong, J. P., Ryu, H. J. and Kim, W. (2012). “Practical method for determination of optimal steel ratio in subway RC flexural members with low fill height.” 2012 Conference Journal of Korea Society of Civil Engineering, pp. 191-194 (in Korean).

Korea Concrete Institute (2013). Concrete structural design code, Kimoondang, pp. 110-113 (in Korean).Korea Concrete Institute (2013). Concrete structural design code, Kimoondang, pp. 110-113 (in Korean).

Korea Road & Transportation (2012). Road bridge design code, GunsulBook, pp. 5(1)-5(169) (in Korean).Korea Road & Transportation (2012). Road bridge design code, GunsulBook, pp. 5(1)-5(169) (in Korean).

Ministry of Land, Infrastructure and Transport (2013). Construction cost sheet of civil design eng. for new Bun-Dang subway 3 zone construction between Gang-Nam station and Jeong-Ja station, pp. 152-306 (in Korean).Ministry of Land, Infrastructure and Transport (2013). Construction cost sheet of civil design eng. for new Bun-Dang subway 3 zone construction between Gang-Nam station and Jeong-Ja station, pp. 152-306 (in Korean).