Abstract
The grouted mortise-tenon joint, invented as the connection between the large prefabricated components, is the key to the prefabricated underground structures, and the double-tenon joint is most widely used in the prefabricated metro station structure. This paper conducts characteristic analysis of bending stiffness with a 1 : 1 prototype test in key working direction of different joint types for grouted double mortise-tenon joint. The results show that the double-tenon joint is characteristic of variable stiffness under different loads. Change laws of double-tenon joint bending stiffness without and with auxiliary pretightening device in tension side and compression side are also discussed. The correlations for calculating double-tenon joint bending stiffness with various axial loads and bending moments are derived at last, which offers the theory foreshadowing of similar joints.
Highlights
With the rapid development of rail transit construction in China, social-environmental awareness increases continuously
E six cut-and-cover stations are all supported by an anchor-pile system. All those horseshoe-shaped two-storey stations are 20.5 m wide and 17.45 m high. e full prefabricated station structure is assembled by seven 2 m width prefabricated components without any concrete wet spraying. e grouted double-tenon joint is the most widely used joint connection method in the prefabricated station structure of Changchun Metro Line 2. e joint performance of a prefabricated metro station has an important impact on the mechanical properties of the whole structure [5,6,7]. e bending stiffness of the joint is one of the main factors that directly affect the distribution of internal force of the structural system
Its stiffness presents a complex mechanical relationship, which changes with the load atmosphere, joint type and size, and other factors
Summary
With the rapid development of rail transit construction in China, social-environmental awareness increases continuously. E above situations are prominent in the northeast of China like Changchun city, located in the northeast region, which is so cold that 4∼5 months’ winter break is needed for metro construction, which causes huge deadline pressure and is hard to guarantee construction quality under low temperature [1,2,3,4]. To address these problems, a new prefabricated technology has been researched, developed, and implemented by Yang et al team for constructing metro stations [5,6,7]. It is the first time to study the characteristics of the newly developed joint for the new prefabricated underground structure, and it is very helpful for engineering application
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