|Table of Contents|

Mechanical Properties and Design Method of One-way Laminated Slab with Shear Keys(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年06期
Page:
35-45
Research Field:
Publishing date:

Info

Title:
Mechanical Properties and Design Method of One-way Laminated Slab with Shear Keys
Author(s):
LI Ming;  WANG Hao-ran;  ZHAO Wei-jian
(School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China)
Keywords:
laminated slab;  shear key;  static load test;  mechanical property;  bending capacity;  yield displacement;  simplified calculation equation
PACS:
TU375.2
DOI:
-
Abstract:
In view of the shortcomings of large amount of reinforcement and high cost for existing laminated slabs of reinforced truss, a new type of laminated slab with concrete shear keys was proposed. The effects of shear keys, number of shear keys along the transverse direction and structural forms of shear keys on the mechanical properties of laminated slabs were analyzed through static loading tests on one cast-in-place slab and six laminated slabs. In addition, the finite element software ABAQUS was used to simulate the stress process of some specimens in the test, which verified the feasibility of the finite element simulation method. Finally, the simplified calculation equations for the bending capacity and the yield displacement of the laminated slab with shear keys were established. The results show that the mechanical properties of the laminated slab with a certain number of shear keys are similar to those of the cast-in-place slab compared with the laminated slab without shear keys. The more the shear keys in number are put, the closer the ultimate bearing capacity of the laminated slab is to that of the cast-in-place slab, and it has almost the same failure characteristics as the cast-in-place slab. The shear keys of different structural forms can ensure effective connection between the prefabricated base plate and the cast-in-place layer. When the tie contact is used between the prefabricated base plate and the cast-in-place layer, the finite element simulation results are closer to the test results. When the friction contact is used between the prefabricated base plate and the cast-in-place layer in the finite element simulation process considering the reliability of structural design, the change of the number of shear keys along the transverse direction and the longitudinal direction and the section area of shear keys enables the change of both the yielding load and the yielding displacement of the laminated slab. However, when the three increase to a certain extent, the change trend is no longer obvious. When the strength grade of cast-in-place layer concrete, the strength grade of shear key concrete and the friction coefficient of surface are changed, the yielding load of the laminated slab and the displacement are basically unchanged.

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Last Update: 2019-11-26