|Table of Contents|

Mechanical Property Study on Split Joint Concrete Composite Slab(PDF)

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

Issue:
2021年03期
Page:
21-29
Research Field:
Publishing date:

Info

Title:
Mechanical Property Study on Split Joint Concrete Composite Slab
Author(s):
HE Qing-feng1; 2;  YANG Kai-hua1
(1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. Hunan Provincial Key Laboratory on Damage Diagnosis for Engineering Structures, Hunan University, Changsha 410082, Hunan, China)
Keywords:
reinforced concrete composite slab;  split joint;  stirrup reinforcement;  mechanical property;  additional reinforcement
PACS:
TU375.2
DOI:
10.19815/j.jace.2020.03042
Abstract:
In order to study the mechanical properties of split joint reinforced concrete composite slab with stirrup as shear tie reinforcement, the load-deflection curve, bearing capacity and deformation performance of three simply supported slabs under different stirrup arrangements were studied. The causes of the cracks, the mechanical mechanism of the joints and the calculation formula of the cracking load were also analyzed. The results show that the development trend of load-deflection curve of standard split joint composite slab is trilinear, and the calculation of cracking load is different from that of common composite slab. The joint of the specimen is prone to tear along the composite plane, and the additional reinforcement is easy to slip or anchor failure. The yield load of the specimen is affected by the bond slip of the additional reinforcement, and its ultimate bearing capacity depends on the tensile strength between the cast-in-place concrete and the precast slab at the joint. The number and width of cracks are related to stirrup bars. Reasonable arrangement of stirrup bars can effectively reduce the number and width of cracks. Before yielding, the deformation of specimens present overall bending, and after yielding, the deformation is mainly concentrated in the joint. The concrete crushing phenomenon appears in all specimens, and the failure mode is close to two fold linear. According to the relevant codes, the problem of additional reinforcement sliding can be improved by anchoring hooks, lengthening the length and raising the position of reinforcement.

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Last Update: 2021-05-20