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Abstract
Joints are always the focus of the precast structure for accelerated bridge construction. In this paper, a girder-to-girder joint suitable for steel-ultra-high-performance concrete (UHPC) lightweight composite bridge (LWCB) is proposed. Two flexural tests were conducted to verify the effectiveness of the proposed T-shaped girder-to-girder joint. The test results indicated that: (1) The T-shaped joint has a better cracking resistance than the traditional I-shaped joint; (2) The weak interfaces of the T-shaped joint are set in the areas with relatively lower negative bending moment, and thus the cracking risk could be decreased drastically; (3) The natural curing scheme for the joint is feasible, and the reinforcement has a very large inhibitory effect on the UHPC material shrinkage; The joint interface is the weak region of the LWCB, which requires careful consideration in future designs. Based on the experimental test results, the design and calculation methods for the deflection, crack width, and ultimate flexural capacity in the negative moment region of LWCB were presented.
Highlights
An accelerated bridge construction (ABC) concept has been proposed in recent years
A type of ultra-high-performance concrete (UHPC) girder-to-girder joint that makes bridges continuous is proposed in the present study
UHPC is a class of cement-based material, and previous research has demonstrated that it has the excellent properties of anti-freeze, anti-corrosion, and crack resistance performance [1,2,3,4,5], and it has been widely used in bridge construction [6,7,8,9]
Summary
An accelerated bridge construction (ABC) concept has been proposed in recent years. The common way for the construction of connections is to increase the reinforcement or to apply the post-tensioning system, while the above schemes extend the on-site construction time, as well as the cost and maintenance. A type of ultra-high-performance concrete (UHPC) girder-to-girder joint that makes bridges continuous is proposed in the present study. UHPC is a class of cement-based material, and previous research has demonstrated that it has the excellent properties of anti-freeze, anti-corrosion, and crack resistance performance [1,2,3,4,5], and it has been widely used in bridge construction [6,7,8,9]. The use of UHPC material can reduce the bridge weight by about 37–54% [10,11]
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