| Structural translocation is a technique to move structure from original location to a new place monolithically.It can be used to move structure horizontally,vertically or rotationally.Design of frame column underpinning joint is the most pivot problem for frame structure moving,because underpinning structure bears all the building load.Since the weight of building has been surmounted over and over again,it is important to study the mechanical capacity of underpinning joint to ensure the success of monolithic moving.First, base on the experimental investigation of thirty-four reduced scale model of underpinning junction, the crack developments of three typed destructions of underpinning junction were presented. Shear span-depth-ratio λ is the most significant factor which influences the mechanical behaviours of underpinning junction. The crashing loads of underpinning junction vary inversely with Shear span-depth-ratio λ. Though embedded bars do not directly influenced the mechanical capacity of underpinning joint, they can improve the boundary of interface.Second, The finite analysis for underpinning joint was carried out in this paper, using concrete damage plasticity model, based on the software ABAQUS. The results of finite analysis were compared with the testing results. It is revealed that the damaging process of underpinning joint can be well simulated by finite analysis. The compared results between underpinning joint and its moving beams disclosed the space-effect of the joint; the displacement of joint is rather small than of its beams during the same load. The damaging load of moving beam was computed and compared with testing result. The computing results show good agreements with testing ones, providing safe and conservative predictions.Finally, strut-and-tie model was used to predicted the final capacity of underpinning joint. The predictions went along well with the testing result, meaning that STM is an appropriate mechanical model for underpinning joint. |
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