884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

（1 華東建筑設(shè)計(jì)研究總院， 上海 200002； 2 上海超高層建筑設(shè)計(jì)工程技術(shù)研究中心， 上海 200002）

［摘要］狗骨式節(jié)點(diǎn)能通過(guò)將塑性鉸外移有效解決梁端脆性斷裂破壞的問(wèn)題從而保護(hù)梁柱節(jié)點(diǎn)區(qū)。從控制方程、設(shè)計(jì)準(zhǔn)則、參數(shù)取值及構(gòu)件驗(yàn)算等方面系統(tǒng)梳理了中美規(guī)范對(duì)于狗骨式節(jié)點(diǎn)的設(shè)計(jì)規(guī)定。基于假定的臨界設(shè)計(jì)狀態(tài)對(duì)上述規(guī)范之間的差異進(jìn)行了詳細(xì)的對(duì)比分析。研究結(jié)果表明：按照美國(guó)鋼結(jié)構(gòu)規(guī)范設(shè)計(jì)的狗骨式節(jié)點(diǎn)，塑性鉸會(huì)優(yōu)先或僅出現(xiàn)在削弱中心截面處，可實(shí)現(xiàn)塑性鉸外移并保護(hù)梁柱節(jié)點(diǎn)區(qū)；而中國(guó)規(guī)范中的“強(qiáng)節(jié)點(diǎn)”公式中，計(jì)算節(jié)點(diǎn)區(qū)的承載力時(shí)使用了材料的極限強(qiáng)度，使得滿足規(guī)范要求的截面削弱系數(shù)較小，難以保證節(jié)點(diǎn)區(qū)的塑性鉸外移，且是否考慮鋼梁腹板的抗彎作用對(duì)節(jié)點(diǎn)設(shè)計(jì)的影響有限。推導(dǎo)了彎矩梯度折減系數(shù)及框架梁抗側(cè)剛度折減系數(shù)的計(jì)算公式，進(jìn)一步明確了狗骨式節(jié)點(diǎn)在多遇地震設(shè)計(jì)組合下的強(qiáng)度復(fù)核原則和彈性分析時(shí)框架梁抗側(cè)剛度的取值原則。最后給出了針對(duì)狗骨式節(jié)點(diǎn)的設(shè)計(jì)建議。

［關(guān)鍵詞］狗骨式節(jié)點(diǎn)；塑性鉸外移；臨界設(shè)計(jì)狀態(tài)；截面削弱系數(shù)；彎矩梯度折減系數(shù)；框架梁抗側(cè)剛度折減系數(shù)

中圖分類號(hào)：TU391文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)07-0059-07

Study on design method of reduced beam section  of rigid joint beam-to-column connection

HUANG Yongqiang1,2, YANG Chengdong1

(1 East China Architectural Design & Research Institute, Shanghai 200002, China; 2 Shanghai Engineering Technology Research Center of Super High Rise Building Design, Shanghai 200002, China)

Abstract:The reduced beam section (RBS) connection can effectively solve the problem of brittle fracture of the beam end by moving the plastic hinge away from column face, thereby protecting the beam-column connection area. From the aspects of control equations, design principle, parameter values and component checking calculations, the design requirements of the Chinese and American code for RBS connections were systematically combed. Based on the assumed critical design conditions, a detailed comparative analysis of the differences between the above specifications was carried out. The results of the study show that: for RBS connections designed in accordance with the American steel structure code, plastic hinges will be preferentially or only appearing at the weakened central section, allowing the plastic hinges to move away from column face and protect the beam-column connection; in the strong connection formula in the Chinese code, the ultimate strength of the material is used when calculating the bearing capacity of the connection area, so that the section reduction coefficient that meets the requirements of the code is small, and it is difficult to ensure the plastic hinge move away from column face. And whether to consider the flexural effect of the steel beam web has limited influence on the connection design. The calculation formulas for the bending moment reduction coefficient and the lateral stiffness reduction coefficient of frame beams were derived, the principle of strength review of RBS connections under the design combination of frequent earthquakes and the selection of frame beam lateral stiffness in elastic analysis were further clarified. Finally, design suggestions for RBS connections were given.

Keywords:reduced beam section connection;plastic hinge away from column face;critical design condition;section reduction coefficient;bending moment reduction coefficient;reduction coefficient for frame beam lateral stiffness

作者簡(jiǎn)介：黃永強(qiáng)，碩士，高級(jí)工程師，Email:hyq@ecadi.com；通信作者：楊成棟，碩士，助理工程師，Email:ycd24813@ecadi.com。