本文關(guān)鍵詞：K型偏心支撐半剛接鋼框架彈塑性受力性能研究　出處：《西安工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 偏心支撐 半剛接 耗能梁段 彈塑性 鋼框架

【摘要】：偏心支撐半剛接鋼框架結(jié)構(gòu)集合了偏心支撐鋼框架及半剛性連接鋼框架兩種結(jié)構(gòu)的優(yōu)點(diǎn),是一種嶄新結(jié)構(gòu)體系。半剛性連接鋼框架具有延性好的特點(diǎn),但結(jié)構(gòu)剛度較弱,偏心支撐能為鋼框架結(jié)構(gòu)提供較大的抗側(cè)移剛度,將二者結(jié)合能夠彌補(bǔ)雙方的不足,使其各自的優(yōu)勢(shì)得到充分發(fā)揮,是一種具有卓越抗震性能的結(jié)構(gòu)體系。但我國對(duì)于該類型結(jié)構(gòu)體系的理論及試驗(yàn)研究相對(duì)匱乏,在工程應(yīng)用中沒有完善的設(shè)計(jì)及分析理論,故本課題特針對(duì)K型偏心支撐半剛接鋼框架進(jìn)行了研究,以豐富該結(jié)構(gòu)在工程應(yīng)用中的理論依據(jù)。本文通過有限元軟件SAP2000建立了 10個(gè)12層的K型偏心支撐半剛接鋼框架模型,其中6個(gè)以耗能梁段的長度為變量、4個(gè)以梁柱節(jié)點(diǎn)初始轉(zhuǎn)動(dòng)剛度為變量,分別對(duì)其進(jìn)行了模態(tài)分析及靜力非線性Pushover分析,以研究其對(duì)結(jié)構(gòu)動(dòng)力特性及彈塑性受力性能的影響。研究結(jié)果表明:隨耗能梁段的增長,結(jié)構(gòu)周期變大,尤其對(duì)于前三階振型,增幅高達(dá)3.3%～6.3%,對(duì)于高階振型的周期影響較小;結(jié)構(gòu)頂點(diǎn)及性能點(diǎn)的水平位移增大,基底剪力及性能點(diǎn)處的加速度減小。耗能梁段變長,會(huì)降低結(jié)構(gòu)的抗側(cè)移剛度值;變短,則會(huì)增加剛度使其難以屈服,故建議對(duì)于本文所建的結(jié)構(gòu)模型,耗能梁段長度取值宜在1000mm～1250mm之間,既能保證結(jié)構(gòu)的抗側(cè)移剛度,也有利于塑性鉸的發(fā)展。當(dāng)節(jié)點(diǎn)初始轉(zhuǎn)動(dòng)剛度小于5 × 105kN · m/rad時(shí),剛度增大會(huì)使結(jié)構(gòu)周期及頂點(diǎn)和性能點(diǎn)處側(cè)移減小、基底剪力及性能點(diǎn)處加速度增大,塑性鉸的數(shù)量也越多;但當(dāng)節(jié)點(diǎn)初始轉(zhuǎn)動(dòng)剛度大于5×105kN·m/rad時(shí),剛度的增加對(duì)結(jié)構(gòu)各參數(shù)的影響甚微,可忽略不計(jì),故本文建議半剛性連接初始轉(zhuǎn)動(dòng)剛度的取值宜為1 × 105kN · m/rad～5 × 105kN · m/rad。耗能梁段長度及節(jié)點(diǎn)初始轉(zhuǎn)動(dòng)剛度的改變對(duì)結(jié)構(gòu)在X、Y方向的質(zhì)量參與系數(shù)影響較小,可忽略不計(jì)。
[Abstract]:Eccentrically braced semi-rigid steel frame structure is a brand new structure system, which combines the advantages of eccentrically braced steel frame and semi-rigid connection steel frame. The semi-rigid connection steel frame has good ductility. But the stiffness of the structure is weak, eccentrically braced steel frame structure can provide a greater lateral stiffness, the combination of the two can make up for the shortcomings of both sides, so that their respective advantages are given full play. It is a structural system with excellent seismic performance, but the theoretical and experimental study of this type of structural system is relatively scarce in our country, and there is no perfect design and analysis theory in engineering application. Therefore, this paper studies the K type eccentrically braced semi-rigid steel frame. In order to enrich the theoretical basis of the application of the structure in engineering, this paper establishes 10 12-story K eccentrically braced semi-rigid steel frame models by the finite element software SAP2000. Six of them take the length of the energy dissipation beam as variables, and four take the initial rotational stiffness of Liang Zhu node as variables. The modal analysis and static nonlinear Pushover analysis are carried out respectively. In order to study its influence on the dynamic characteristics and elastic-plastic mechanical properties of the structure, the results show that the period of the structure becomes larger with the increase of the energy dissipation beam section, especially for the first three modes, the increase is as high as 3.3% or 6.3%. It has little effect on the period of high-order modes. The horizontal displacement of the vertex and the performance point of the structure increases, the acceleration at the base shear force and the performance point decreases, and the energy dissipation beam becomes longer, which will reduce the stiffness of the structure against lateral displacement. It is suggested that the length of energy dissipation beam should be in the range of 1000mm / 1250mm for the structural model built in this paper, which can guarantee the anti-lateral stiffness of the structure. When the initial rotational stiffness of the joints is less than 5 脳 10 ~ 5kN 路m ~ (-1) rad, the increase of the stiffness will decrease the structural period, the vertices and the performance points. The number of plastic hinges increases with the increase of the acceleration at the base shear force and the performance point. However, when the initial rotational stiffness of the node is greater than 5 脳 105 KN 路m / rad, the increase of stiffness has little effect on the parameters of the structure, which is negligible. Therefore, it is suggested that the initial rotational stiffness of semi-rigid connections should be 1 脳 10 5 KN 路m / r rad5 脳 10 5 KN. The length of the energy dissipation beam and the initial rotational stiffness of the joint are changed to the structure at X. The quality participation coefficient of Y direction has little influence and can be neglected.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU391

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