Ultra-high performance concrete (UHPC) is featured by a
compressive strength 5 times higher than that of ordinary concrete and by a
high durability owing to the control of the chloride penetration speed by its
dense structure. The high strength characteristics of UHPC offer numerous advantages
like the reduction of the quantities of cables and foundations by the design of
a lightweight superstructure in the case of the long-span bridge preserving its
structural performance through axial forces and structures governed by
compression. This study conducted the conceptual design of a hybrid cable-stayed
bridge with central span of 1000 m and exploiting 200 MPa-class UHPC. The
economic efficiency of the conceptual design results of the hybrid cable-stayed
bridge with central span of 1000 m and of Sutong Bridge, the longest
cable-stayed bridge in the world, was analyzed.
This study developed an optimal structural system for the hybrid cable-stayed bridge expected to have a durable lifetime of 200 years and of which major structural members are made of ultra high performance concrete (UHPC) with 200 MPa-class compressive strength. This innovative cable-stayed bridge system makes it possible to reduce each of the construction and maintenance costs by 20% compared to the conventional concrete cable-stayed bridge by improving significantly the weight and durability of the bridge. Therefore, detail design is carried out considering a real 800 m cable-stayed bridge and the optimal structure of the hybrid cable-stayed bridge is proposed and verified.