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（1 河北建筑工程學(xué)院， 張家口 075051；2 河北省土木工程診斷、改造與抗災(zāi)重點(diǎn)實(shí)驗(yàn)室， 張家口 075051）

［摘要］為解決鋼梁腹板開圓孔型節(jié)點(diǎn)開孔處抗震承載力不足、受力變形過大等問題，提出了在鋼梁腹板孔洞區(qū)域設(shè)置開孔槽鋼的加強(qiáng)方法，并以槽鋼弧形削弱位置rl、削弱深度c、槽鋼厚度t、槽鋼材性m為主要參數(shù)，設(shè)計(jì)了15個(gè)節(jié)點(diǎn)模型。運(yùn)用有限元軟件ANSYS模擬分析了循環(huán)荷載作用下各模型的滯回曲線、骨架曲線、剛度退化情況及耗能能力。結(jié)果表明：在梁腹板開孔處設(shè)置槽鋼后，節(jié)點(diǎn)的極限承載能力、初始剛度、耗能能力較未加強(qiáng)節(jié)點(diǎn)均大幅度提升；槽鋼上下翼緣及腹板進(jìn)行適當(dāng)弧形削弱的節(jié)點(diǎn)較未削弱或削弱不當(dāng)?shù)墓?jié)點(diǎn)，其后期剛度退化速率較小，滯回曲線更加飽滿，總能量耗散系數(shù)最大；槽鋼削弱位置rl和削弱深度c相同的節(jié)點(diǎn)的承載力、初始剛度、耗能性能均隨著槽鋼厚度t的增加而增加；槽鋼的強(qiáng)度等級(jí)高于鋼梁強(qiáng)度時(shí)，節(jié)點(diǎn)在峰值位移階段的耗能能力顯著降低。

［關(guān)鍵詞］鋼梁腹板開圓孔梁柱節(jié)點(diǎn)；槽鋼加強(qiáng)；滯回性能；剛度退化；耗能能力；節(jié)點(diǎn)模型

中圖分類號(hào)：TU391文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)09-0141-08

Numerical simulation analysis of hysteresis behavior of beam-column joints with circular holes in the steel beam web reinforced with channel steel

LIU Zhongyang1,2, WANG An’an1, DONG Xinyuan1, ZHANG Mingpu1, MAO Hui1, CHEN Jie1

(1 Hebei University of Architecture, Zhangjiakou 075051, China；2 Hebei Key Laboratory for Diagnosis, Reconstruction and Anti-disaster of Civil Engineering, Zhangjiakou 075051, China)

Abstract:In order to solve the problems of insufficient seismic bearing capacity and excessive deformation at the opening of steel beam web circular hole type joint, the strengthening method of setting opening channel steel in the hole area of steel beam web was proposed. With the arc weakening position rl, weakening depth c, channel steel thickness t and channel steel material m as the main parameters, 15 joint models were designed. The hysteretic curve, skeleton curve, stiffness degradation and energy dissipation capacity of each model under cyclic load were simulated and analyzed by using the finite element software ANSYS. The results show that the ultimate bearing capacity, initial stiffness and energy dissipation capacity of the joint are greatly improved after setting the channel steel at the opening of the beam web compared with those of the unreinforced joint; the specimens with appropriate arc weakening of the upper and lower flange and web of the channel steel have smaller stiffness degradation rate, fuller hysteretic curve and the largest total energy dissipation coefficient. The bearing capacity, initial stiffness and energy dissipation performance of the joints with the same channel weakening position rl and weakening depth c increase with the increase of channel steel thickness t. When the strength grade of channel is higher than that of steel beam, the energy dissipation capacity of the joints in the peak displacement stage decreases significantly.

Keywords:beam-column joint with circular holes in the steel beam web; reinforced with channel steel; hysteresis behavior; stiffness degeneration; energy dissipation capability; joint model

*河北省教育廳青年基金項(xiàng)目（QN2017323），河北建筑工程學(xué)院創(chuàng)新基金（XB201926）。

作者簡(jiǎn)介：劉仲洋，博士，副教授，碩士生導(dǎo)師，Email：smartlzy@sina.com。