Abstract
KICT (Korea Institute of Construction Technology) is conducting a project called “SUPER BRIDGE 200—Development of Low Cost and Long Life Hybrid Cable Stayed Bridge”. This project aims to reduce the construction and main- tenance costs of long-span bridges by 20% and double their lifetime through the exploitation of ultra-high performance concrete (UHPC). This paper presents the design and construction of the first pedestrian cable stayed bridge using UHPC developed by KICT. UHPC, compared to conventional concrete, has not only high compressive and tensile strengths but also high ductility. The UHPC developed at KICT is a steel fiber-reinforced cement compound presenting design compressive strength larger than 180 MPa and design tensile strength exceeding 10 MPa with water-to-binder ratio below 0.24 and admixing of 2 volume percentage of steel fiber. To show the applicability of UHPC to structures, a pedestrian cable stayed bridge (Super Bridge I) exploiting the characteristics of the developed UHPC has been planned, designed and erected at KICT. The dimension of UHPC deck is 2.7 m × 7 m as a precast segment with a typical thickness of deck of only 7 cm. However, harmful crack was observed in the deck at the time of the fabrication of the deck segments. Accordingly, new fabrication method was conceived and applied to prevent cracking of the UHPC slender deck. Four UHPC deck segments were fabricated successfully without any crack. After construction, the dynamic characteristics (natural frequencies and mode shapes) were evaluated through vibration tests since several users felt excess vibration. A vertical tuned mass damper (TMD) was proposed and installed on the parapet of the bridge. The TMD reduces the acceleration by about 30% from 0.0316 g to 0.0244 g when two pedestrians are crossing the bridge.
Highlights
In order to overcome the drawbacks of conventional concretes, Ultra High Performance Concrete (UHPC) is a material presenting high strength as well as tensile strength and flexural strength that was developed to secure the ductility and strength of the structural members by improving significantly resistance to cracking, shear resistance and resistance to impact through the introduction of steel fibers and admixtures
A pedestrian cable stayed bridge using 200 MPa class ultra-high performance concrete (UHPC) developed by KICT has been designed and erected for the first time in the world
KICT-UHPC with a design compressive strength larger than 180 MPa can resist to large compressive forces and is a material enabling to minimize the thickness of the cross-section owing to its large resistance to tension and shear
Summary
In order to overcome the drawbacks of conventional concretes, Ultra High Performance Concrete (UHPC) is a material presenting high strength as well as tensile strength and flexural strength that was developed to secure the ductility and strength of the structural members by improving significantly resistance to cracking, shear resistance and resistance to impact through the introduction of steel fibers and admixtures. KICT (Korea Institute of Construction Technology) is undertaking the “SUPER BRIDGE 200—Development of Low Cost and Long Life Hybrid Cable Stayed Bridge” project. KICT developed the KICTUHPC, a fiber-reinforced cement composite providing design compressive strength larger than 180 MPa and design direct tensile strength larger than 10 MPa with a water-to-binder ratio below 0.24 and volume percentage of fiber larger than 2 vol.%. As part of this project, KICT implemented the construction of a pedestrian cable stayed bridge, Super Bridge I, applying UHPC for the first time in the world (Figure 1).
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