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首页> 外文期刊>International journal of steel structures >Assessment of Progressive Collapse Behaviour of Moment Frames Strengthened with Knee Elements
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Assessment of Progressive Collapse Behaviour of Moment Frames Strengthened with Knee Elements

机译：膝关节元件加固矩框架的渐进塌陷行为评估

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摘要

Knee element can be used in junction of beam and column elements for strengthening steel moment frames against progressive collapse. Two different types of knee elements, namely strong and weak knee elements have been used to strengthen the frames. Strong knee element has been designed in a way that it prevents the occurrence of plastic hinge on knee element before beam element. But in weak knee elements, formation of plastic hinge on knee element will be prior to formation of the plastic hinge on the beam element. The nonlinear static alternate path analysis in accordance with the UFC guideline has been used to determine the resistance of structures against progressive collapse. The results indicate the priority of strong knee elements compared to weak knee elements in strengthening the structure against progressive collapse. Installing strong knee element reduces the effective length of beams and columns and changes the direction of flow of forces from the beam–column connection to out of the knees area and changes the position for the formation of plastic hinges. Eventually, the installation of strong knee elements will increase stiffness and structural strength and result in better behaviour against progressive collapse.
机译：膝盖元件可用于梁和柱元件的连接处，以加强钢制矩框架以防止逐渐倒塌。两种不同类型的膝盖元素，即强和弱膝盖元素已用于加强框架。设计坚固的膝盖元件，可防止在梁元件之前在膝盖元件上出现塑料铰链。但是在弱膝盖元件中，在梁元件上形成塑料铰链之前，将在膝盖元件上形成塑料铰链。根据UFC准则进行的非线性静态替代路径分析已用于确定结构抵抗渐进倒塌的能力。结果表明，与弱膝盖元素相比，强膝盖元素在增强结构以防止进行性塌陷方面具有优先权。安装坚固的膝盖元件可减少梁和柱的有效长度，并改变从梁柱连接到膝盖以外区域的力流方向，并改变塑料铰链形成的位置。最终，安装牢固的膝盖元件将增加刚度和结构强度，并导致抵抗渐进性塌陷的更好行为。

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