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EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF DOUBLE-LAYER SHOULDER BEAMS WITH TRIPLE-LIMB SIDE COLUMNS OF CONCRETE-FILLED STEEL TUBES
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摘要: 为了研究双层肩梁的受力性能和破坏模式，以便更好地为双层肩梁的设计提供理论支持，设计了3个三肢边柱双层肩梁试件，并对其进行单调加载试验，通过改变中柱内肢在下肩梁的作用位置，分析其对试件的屈服荷载、主要部位的应变、屈服机制和破坏模式的影响。结果表明：下肩梁内肢侧腹板的屈服对试件的屈服荷载起控制因素，并能很好反映试件的屈服，可以腹板的屈服来确定试件的屈服荷载；在中柱内肢向外侧偏移的过程中，双层肩梁的承载力提高；试件的破坏是由于下肩梁内肢侧腹板发生剪切型凸曲变形。Abstract: In order to study the mechanical property and failure mode of double-layer shoulder beams, so as to provide theoretical support for the design of the double-layer shoulder beam, three specimens of double-layer shoulder beams with triple-limb side columns were designed and tested under monotonic loading. By changing the action position of the inner limb of the middle column on the lower shoulder beam, the effects on the yield load, strain of the main parts, yield mechanism and failure mode of specimens were analyzed. The results showed that the yield of the inner limb web of the lower shoulder beam was the control factor of the yield load for specimens, which could reflect the yield of specimens very well. The yield load of specimens could be determined by the yield of web plates; the bearing capacity of the double shoulder beam was improved in the process of outer shift for inner limbs of middle columns; the failure of specimens was due to the shear type convex deformation of side webs for inner limbs of lower shoulder beams.
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Key words:
- double-layer shoulder beam /
- yield load /
- strain analysis /
- bearing capacity /
- failure mode
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