【摘要】：為研究梁端翼緣削弱型節(jié)點(diǎn)鋼框架的抗震性能,設(shè)計鋼框架試驗加載裝置,進(jìn)行1∶3縮尺比例的2榀2層1跨梁端翼緣削弱型節(jié)點(diǎn)空間鋼框架的低周往復(fù)荷載試驗,研究其受力特點(diǎn)及破壞形態(tài),對模型框架結(jié)構(gòu)的荷載-位移滯回曲線、骨架曲線、剛度退化、承載力退化、塑性耗能能力等抗震性能進(jìn)行分析。試驗結(jié)果表明:空間鋼框架的8個梁端翼緣削弱型節(jié)點(diǎn)塑性鉸均外移至圓弧削弱區(qū)域,所有節(jié)點(diǎn)的梁柱連接焊縫均未出現(xiàn)裂縫,荷載-位移滯回曲線飽滿,破壞時結(jié)構(gòu)位移延性系數(shù)介于3.05~3.82之間,等效黏滯阻尼系數(shù)介于0.34~0.41之間,彈塑性極限位移層間轉(zhuǎn)角介于0.035 5~0.044 5 rad之間。鋼框架梁柱連接采用圓弧削弱型節(jié)點(diǎn)可使梁端應(yīng)力平緩過渡,避免梁柱連接焊縫處產(chǎn)生應(yīng)力集中現(xiàn)象,鋼框架塑性內(nèi)力重分布后對圓弧削弱型節(jié)點(diǎn)的耗能性能沒有明顯影響。圓弧削弱型節(jié)點(diǎn)在鋼框架中表現(xiàn)出較好的延性性能,提高了鋼框架整體結(jié)構(gòu)的抗震性能及塑性耗能能力。
[Abstract]:In order to study the seismic behavior of steel frame with weakened flange at beam end, the experimental loading device of steel frame was designed, and the low cycle reciprocating load test of 2 steel frames with 2 stories and 1 span flange weakening joint at 1:3 scale was carried out. The load-displacement hysteretic curve, skeleton curve, stiffness degradation, bearing capacity degradation and plastic energy dissipation capacity of the model frame structure are analyzed. The test results show that the plastic hinge of 8 beam flange weakened joints in the space steel frame is moved outward to the arc-weakening zone, and no cracks are found in the joint weld of all the joints, and the load-displacement hysteretic curve is full. The displacement ductility coefficient of the structure is between 3.05 and 3.82, the equivalent viscous damping coefficient is between 0.34 and 0.41, and the rotation angle of the elastic-plastic limit displacement layer is between 0.035 5 and 0.044 5 rad. The circular arc weakening joint used in the connection of steel frame Liang Zhu can make the stress of beam end smooth transition and avoid the phenomenon of stress concentration in the welds of Liang Zhu connection. After the distribution of plastic internal force of steel frame is redistributed, the energy dissipation performance of circular arc weakening joint is not obviously affected. The circular arc-weakened joints exhibit better ductility in steel frames and improve the seismic performance and plastic energy dissipation capacity of the steel frame structure as a whole.
【作者單位】： 青島理工大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51278259)
【分類號】：TU391;TU352.11

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本文編號：2318544