Abstract
Steel-concrete composite beam has been widely applied in civil engineering, and the concrete during operation may crack due to the large shear force at the wet joint. A new concrete panel shear key with the boss is designed to strengthen the shear capacity of the wet joint part. Three different configurations of specimens are tested to study the shear capacity of the wet joint. These specimens include plain concrete specimens with shear keys, specimens with reinforcement and no shear key, and specimens with both shear keys and reinforcements. An experimental study is designed and conducted to verify the shear capacity of each specimen. The experimental results show that the ultimate shear capacity of the new wet joint structure is 73% higher than the conventional one. Meanwhile, the shear capacity of the new wet joint structure is theoretically predicted, and the finite element models are established to demonstrate the effectiveness of the experiment and the good performance of the new wet joint design.
Highlights
Rough experiment study, Haber [12] verified the good bonding performance and crack resistance of noncontact lap splices joint combined with ultrahigh-performance concrete (UHPC)
As for the shape of the wet joint, the traditional construction technology of wet joint is to set a shear pocket where its surface is made of exposed aggregate finish [3]. e sawtooth, rectangular, and other special-shaped wet joints have similar mechanical properties as the traditional wet joints but have higher crack resistance [13]
A large number of research studies have been devoted to study the mechanical properties of the shear key in an adjacent box-girder bridge by experiment or finite element methods [19,20,21]
Summary
Rough experiment study, Haber [12] verified the good bonding performance and crack resistance of noncontact lap splices joint combined with UHPC. Zhao et al [23] proposed a dovetail-type wet joint and studied its crack resistance under a negative bending moment. Qi et al [7] proposed an innovative dovetail shear key that can effectively improve the crack resistance of concrete at wet joints. Is study is focused on a novel shear connector design to improve the shear capacity of the wet joint. E new shear connector of the wet joint as shown in Figure 2 is expected to have enhanced shear capacity along both the horizontal and vertical directions.
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