地震下支撑连接的净截面破坏:试验及模拟
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摘要
介绍槽端支撑连接的6组试验、有限元模拟及早期试验总结的研究结果。本研究主要是为了检验连接件的变形能力,以达到减小对净截面加强要求(操作不便)的目的。试验及模拟大多采用管件和端部细节构造。进行节点板厚度、槽长、采用围焊消除节点板边缘削弱等参数研究。结果表明:如果采用围焊或净截面强度比毛截面屈服强度大,那么即使不进行截面加强,连接件也具有足够变形能力。这可以达到减小连接处剪力滞,达到槽面而减小区域比毛截面小的效果。根据有限的研究,提出设计思路。
Results from six tests,finite element simulations and a synthesis of previous test programs on slotted end bracing connections are presented.The main objective of the research is to examine the deformation capacity of these connections,with the ultimate objective of minimizing the requirement for net section reinforcement that is often inconvenient from the perspective of fabrication.The experiments and simulations feature commonly used pipe specimens and end details.The main parameters investigated include the gusset plate thickness,the slot length and introduction of a wrap-around weld that eliminates the reduced section at the edge of the gusset plate.The results indicate that even without reinforcement,the connections offer adequate to excellent deformation capacity if they are provided with the wrap-around weld or if the net section strength is larger than the gross yield strength.This may be achieved in situations where shear lag in the connection is minimal,and where the area reduction due to the slot is small relative to the gross area.Design considerations are presented along with limitations of the study.
Results from six tests,finite element simulations and a synthesis of previous test programs on slotted end bracing connections are presented.The main objective of the research is to examine the deformation capacity of these connections,with the ultimate objective of minimizing the requirement for net section reinforcement that is often inconvenient from the perspective of fabrication.The experiments and simulations feature commonly used pipe specimens and end details.The main parameters investigated include the gusset plate thickness,the slot length and introduction of a wrap-around weld that eliminates the reduced section at the edge of the gusset plate.The results indicate that even without reinforcement,the connections offer adequate to excellent deformation capacity if they are provided with the wrap-around weld or if the net section strength is larger than the gross yield strength.This may be achieved in situations where shear lag in the connection is minimal,and where the area reduction due to the slot is small relative to the gross area.Design considerations are presented along with limitations of the study.
引文
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