采用低屈服点金属的可置换式钢节点减震分析
发布时间：2019-02-15 00:34
【摘要】：传统钢结构节点设计通常不能充分达到预期抗震要求,而以梁端削弱型梁柱节点虽然能够初步实现"强柱弱梁",但可能在削弱区产生局部屈曲和整体侧移,在强震下安全储备不足。针对此问题,基于可恢复功能减震结构的理念,提出采用低屈服点金属的梁端削弱更换式梁柱节点。该节点利用低屈服点材料对翼缘和腹板的削弱处进行填补,在地震中低屈服点金属率先屈服并充分耗能,可降低节点主体的损伤,并可在震后对低屈服点金属进行更换。选取低屈服点钢材作为置换材料,通过材料性能试验获得相应的材料本构。在此基础上,对比分析低周往复加载下不同的抗震减震性能和损伤特征。采用多尺度有限元建模方式对采用不同类型节点的钢框架进行弹塑性时程分析。结果表明,可置换式节点能够将主要损伤控制在置换材料内,并具有更强的耗能能力、可恢复能力和安全储备。
[Abstract]:The traditional design of steel structure joints can not fully meet the expected seismic requirements. Although the "strong column and weak beam" can be initially realized by the weakened Liang Zhu joint at the end of the beam, it may produce local buckling and overall lateral displacement in the weakened area. Safety reserves are insufficient under strong earthquakes. In order to solve this problem, based on the idea of recoverable functional shock absorber structure, a low yield point metal beam end is proposed to weaken and replace Liang Zhu joints. The joint uses low yield point material to fill the weakening place of flange and web. The metal of low yield point is the first to yield and consume energy fully in earthquake. The damage of joint body can be reduced and the metal of low yield point can be replaced after earthquake. Low yield point steel was selected as replacement material, and the corresponding constitutive equation was obtained by material performance test. On the basis of this, the different seismic performance and damage characteristics under low cycle reciprocating loading are compared and analyzed. The elastoplastic time history analysis of steel frames with different types of joints is carried out by means of multi-scale finite element modeling. The results show that the replaceable joints can control the main damage in the replacement materials and have stronger energy dissipation ability, recoverability and safety reserve.
【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】：国家自然科学基金资助项目(51478024) 工程抗震与结构诊治北京市重点实验室重点资助项目(USDE201403)
【分类号】：TU391;TU352.1
本文编号：2422769
[Abstract]:The traditional design of steel structure joints can not fully meet the expected seismic requirements. Although the "strong column and weak beam" can be initially realized by the weakened Liang Zhu joint at the end of the beam, it may produce local buckling and overall lateral displacement in the weakened area. Safety reserves are insufficient under strong earthquakes. In order to solve this problem, based on the idea of recoverable functional shock absorber structure, a low yield point metal beam end is proposed to weaken and replace Liang Zhu joints. The joint uses low yield point material to fill the weakening place of flange and web. The metal of low yield point is the first to yield and consume energy fully in earthquake. The damage of joint body can be reduced and the metal of low yield point can be replaced after earthquake. Low yield point steel was selected as replacement material, and the corresponding constitutive equation was obtained by material performance test. On the basis of this, the different seismic performance and damage characteristics under low cycle reciprocating loading are compared and analyzed. The elastoplastic time history analysis of steel frames with different types of joints is carried out by means of multi-scale finite element modeling. The results show that the replaceable joints can control the main damage in the replacement materials and have stronger energy dissipation ability, recoverability and safety reserve.
【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】：国家自然科学基金资助项目(51478024) 工程抗震与结构诊治北京市重点实验室重点资助项目(USDE201403)
【分类号】：TU391;TU352.1
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