Experiment and Analysis on X-Shaped Reinforced Concrete Joint in Diagrid Structures
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Experiment and Analysis on X-Shaped Reinforced Concrete Joint in Diagrid Structures
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Experiment and Analysis on X-Shaped Reinforced Concrete Joint in Diagrid Structures

Author: Wei Zhou, Jianxin Zhang, and Zhenggang Cao | Size: 3 MB | Format: PDF | Quality: Unspecified | Publisher: ACI | Year: 2013 | pages: 12

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Diagrid tube structures are expected to be used for the outer tubes
of super tall tube-in-tube buildings. The mechanical behavior and
design method of X-shaped reinforced concrete joints, which are
formed by four crossed inclined columns and horizontal girders,
are important issues in the design and analysis of vertical crossing
lattice tube. Taking the volumetric ratio of the stirrup and the
loading pattern as fundamental parameters, four X-shaped
reinforced concrete joints were designed and subjected to static
axial load testing. The test phenomenon—including deformation
of joint zones, development of cracks, and crushing of concrete—
is strongly emphasized in the analysis. The laws of the stiffness
response and stress development in longitudinal bars and stirrups
are revealed, and the ultimate load-bearing capacity of four joints
is obtained. The test results show that the stirrups may confine
the lateral expanding deformation of the joint concrete regions.
The X-shaped reinforced concrete joints with normal volumetric
ratios of stirrups may be designed to provide large stiffness and
high load-bearing capacity, which are also effective in transmitting
the inner force from four crossed inclined columns. Adopting
two loading patterns—agreeing and differential loads—on four
inclined columns has little influence on the load-bearing capacity
of the joints. Based on the results of the test and analysis, design
recommendations and formulas of the bearing capacity for
X-shaped reinforced concrete joints in vertical crossing lattice
structures are proposed.

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