In response to a wide range of requirements, NKK has developed a number of products for application in bridges, coastal civil works, steel pipes, water gates, and steel framing. This paper summarizes the trends and requirements for improvement of social capital in the field of steel structures, and reports on the primary technologies and products required to respond to the emerging needs of tomorrow.

Steel structure, Bridge, Coastal structure, Steel penstock and hydraulic gate, Steel frame, Improvement of social capital, Cable-stayed bridge, Hybrid caisson, Maintenance, Minitoring and diagnosis