發(fā)布時(shí)間：2019-02-15 00:34

【摘要】：傳統(tǒng)鋼結(jié)構(gòu)節(jié)點(diǎn)設(shè)計(jì)通常不能充分達(dá)到預(yù)期抗震要求,而以梁端削弱型梁柱節(jié)點(diǎn)雖然能夠初步實(shí)現(xiàn)"強(qiáng)柱弱梁",但可能在削弱區(qū)產(chǎn)生局部屈曲和整體側(cè)移,在強(qiáng)震下安全儲備不足。針對此問題,基于可恢復(fù)功能減震結(jié)構(gòu)的理念,提出采用低屈服點(diǎn)金屬的梁端削弱更換式梁柱節(jié)點(diǎn)。該節(jié)點(diǎn)利用低屈服點(diǎn)材料對翼緣和腹板的削弱處進(jìn)行填補(bǔ),在地震中低屈服點(diǎn)金屬率先屈服并充分耗能,可降低節(jié)點(diǎn)主體的損傷,并可在震后對低屈服點(diǎn)金屬進(jìn)行更換。選取低屈服點(diǎn)鋼材作為置換材料,通過材料性能試驗(yàn)獲得相應(yīng)的材料本構(gòu)。在此基礎(chǔ)上,對比分析低周往復(fù)加載下不同的抗震減震性能和損傷特征。采用多尺度有限元建模方式對采用不同類型節(jié)點(diǎn)的鋼框架進(jìn)行彈塑性時(shí)程分析。結(jié)果表明,可置換式節(jié)點(diǎn)能夠?qū)⒅饕獡p傷控制在置換材料內(nèi),并具有更強(qiáng)的耗能能力、可恢復(fù)能力和安全儲備。
[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.
【作者單位】： 北京工業(yè)大學(xué)工程抗震與結(jié)構(gòu)診治北京市重點(diǎn)實(shí)驗(yàn)室;首都世界城市順暢交通北京市協(xié)同創(chuàng)新中心;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51478024) 工程抗震與結(jié)構(gòu)診治北京市重點(diǎn)實(shí)驗(yàn)室重點(diǎn)資助項(xiàng)目(USDE201403)
【分類號】：TU391;TU352.1

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