梁端填充低屈服点钢材的梁柱连接减震性能试验与损伤分析

发布时间：2019-01-17 14:17

【摘要】：传统钢结构节点通常按刚性节点理念进行设计,其实际抗震性能可能达不到设计预期。梁端削弱型梁柱节点虽然能够初步实现"强柱弱梁",但在削弱区会产生局部屈曲,在强震作用下安全储备不足。基于可恢复功能结构理念,提出采用低屈服点钢材对梁翼缘和腹板的削弱处进行填补,使低屈服点钢材在地震中率先屈服并充分耗能,以降低节点主体的损伤,并可在震后对低屈服点钢材进行更换。针对现有地震损伤模型的不足,提出基于弹塑性耗能差率的能量损伤模型,从而更准确细致地评价钢梁端连接的损伤性能。试验加工制作了相应的传统钢节点、削弱钢节点和填充式耗能钢节点,并进行低周往复加载试验研究。通过多种性能评价参数,对梁端连接的减震性能进行综合评估。结果表明,填充式耗能钢节点具有更加优良的承载能力、延性和耗能能力。此外,所提出的能量损伤指标可以更好地反映梁端连接损伤演变过程及其损伤规律。
[Abstract]:The traditional steel structure joints are usually designed according to the idea of rigid joints, and their actual seismic performance may not meet the design expectations. Although the "strong column and weak beam" can be preliminarily realized at the end of the beam, the local buckling will occur in the weakened zone, and the safety reserve will be insufficient under the action of strong earthquake. Based on the concept of recoverable functional structure, it is proposed to use low yield point steel to fill the weakening place of beam flange and web, so that the low yield point steel can yield first and consume energy fully in earthquake, so as to reduce the damage of the joint body. The low yield point steel can be replaced after the earthquake. An energy damage model based on elastoplastic energy dissipation rate is proposed to evaluate the damage performance of steel beam end connections more accurately and carefully. The corresponding traditional steel joints were manufactured, which weakened the steel joints and filled with energy-consuming steel joints, and the low cycle reciprocating loading test was carried out. Through a variety of performance evaluation parameters, the vibration absorption performance of beam end connection is comprehensively evaluated. The results show that the filled steel joints have better bearing capacity, ductility and energy dissipation capacity. In addition, the proposed energy damage index can better reflect the damage evolution process and damage law of beam end connection.
【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;首都世界城市顺畅交通北京市协同创新中心;
【基金】：国家自然科学基金项目(51478024) 工程抗震与结构诊治北京市重点实验室重点项目(USDE201403)
【分类号】：TU391

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