Impact of the reinforcement layout on the load capacity of reinforced concrete half-joints
Impact of the reinforcement layout on the load capacity of reinforced concrete half-joints
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钢筋布置对钢筋混凝土半节点承载能力的影响
DOI：
10.1016/j.engstruct.2016.08.061
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发表时间：
2016
影响因子：
5.5
通讯作者：
Desnerck P
中科院分区：
文献类型：
--
作者：
Desnerck P
钢筋混凝土半节点梁具有复杂的几何形状，既包括局部扰动的尖端区域，也包括全深度截面。虽然这种配置简化了设计和施工程序，但半连接结构依靠内部钢筋将力从尖端传递到梁的主体。在评估现有的钢筋混凝土半缝时，工程师可能会遇到内部钢筋布局与设计图纸不符和/或不符合当前设计实践的情况。为了更好地了解在典型的半节点细部中发现的内部钢筋的贡献，进行了足尺半节点梁的试验测试程序。测试了四种不同的方案，以确定特定钢筋的影响。参照样品是按照现有的做法设计的。对参照梁和缺少斜筋、缺少水平钢筋或剪力筋数量减少的梁进行了测试，除剪力筋减少的梁外，所有梁都出现了压边破坏。在这种情况下，故障模式从压头故障变为全深度故障。结果表明，如果某些杆件丢失，半节点的整体承载能力可能会比适当设计的细部降低约40%，但会注意到力的重新分配。
A reinforced concrete half-joint beam has a complex geometry that includes both a locally disturbed nib region and a full depth section. While this configuration simplifies the design and construction procedures, half joint structures rely on the internal steel reinforcement to transfer force from the nib into the bulk of the beam. When assessing existing reinforced concrete half-joints, engineers can be confronted with internal reinforcement layouts that do not correspond to the as-designed drawings and/or do not comply with current design practice. Bars may be missing or the location, percentage and spacing of the steel reinforcing bars may be non-compliant.To provide a better understanding of the contribution of the internal steel reinforcing bars found in a typical half joint detail, an experimental test program on full-scale half-joint beams was undertaken. Four different scenarios were tested to identify the impact of specific reinforcing bars. A reference specimen was designed in accordance with existing practice. The reference beam, and beams with either missing diagonal reinforcement, missing horizontal reinforcement or a reduced amount of shear reinforcement were tested.All the beams exhibited nib failures with the exception of the beam where the shear reinforcement was reduced. In this case, the failure mode changed from a nib failure to a full-depth failure. The results indicated that if certain bars are missing the overall load bearing capacity of a half-joint could be approximately 40% lower than that of a properly designed detail, but that a redistribution of forces was noted.
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