發(fā)布時(shí)間：2018-05-15 05:22

  本文選題：強(qiáng)梁弱柱 + 樓板��； 參考：《中國(guó)地震局工程力學(xué)研究所》2015年碩士論文

【摘要】：在汶川地震和玉樹地震中,很多按現(xiàn)行規(guī)范設(shè)計(jì)的鋼筋混凝土框架結(jié)構(gòu)出現(xiàn)了結(jié)構(gòu)抗震設(shè)計(jì)中極力避免的“強(qiáng)梁弱柱”式破壞,而不是預(yù)期的“強(qiáng)柱弱梁”延性破壞機(jī)制。這種震害現(xiàn)象引起了研究人員的高度關(guān)注,并開展了相關(guān)研究。本文在系統(tǒng)總結(jié)國(guó)內(nèi)外相關(guān)研究的基礎(chǔ)上,主要從結(jié)構(gòu)和構(gòu)件耗能、構(gòu)件利用率與層間位移角三個(gè)角度,就樓板對(duì)“強(qiáng)梁弱柱”式破壞的影響進(jìn)行了研究,主要工作如下:1.對(duì)比評(píng)述了各國(guó)規(guī)范對(duì)“強(qiáng)柱弱梁”的相關(guān)規(guī)定。各國(guó)規(guī)范對(duì)于“強(qiáng)柱弱梁”的設(shè)計(jì)思想都是采用增大柱端彎矩的方法。區(qū)別在于計(jì)算梁端設(shè)計(jì)彎矩時(shí),對(duì)樓板的考慮:一種是按梁原截面計(jì)算梁端設(shè)計(jì)彎矩,通過提高柱端彎矩增大系數(shù)的取值,間接考慮樓板影響;另一種是將樓板對(duì)梁的加強(qiáng)作用折算成一定范圍內(nèi)的板,參與梁受彎,按T型截面計(jì)算梁端設(shè)計(jì)彎矩。2.研究在不同強(qiáng)度水平地震動(dòng)作用下,樓板對(duì)RC框架結(jié)構(gòu)地震反應(yīng)的影響。通過將梁和樓板的共同作用簡(jiǎn)化為不同有效翼緣寬度的T型梁,建立四個(gè)分析模型,并對(duì)其進(jìn)行非線性地震反應(yīng)分析。從結(jié)構(gòu)和構(gòu)件耗能、構(gòu)件利用率和層間位移角三個(gè)角度的對(duì)比分析,發(fā)現(xiàn):1)當(dāng)?shù)卣饎?dòng)強(qiáng)度不大于原結(jié)構(gòu)設(shè)防烈度的罕遇地震時(shí),由于樓板對(duì)梁的加強(qiáng)作用,隨著T型梁有效翼緣寬度的增加,梁中的非彈性耗能減少,而柱的非彈性耗能并未增加;框架結(jié)構(gòu)中的主要受力構(gòu)件(框架梁和框架柱)的利用率總體在降低;層間位移角減小。2)當(dāng)?shù)卣饎?dòng)強(qiáng)度大于原結(jié)構(gòu)設(shè)防烈度的罕遇地震時(shí),由于樓板對(duì)梁的加強(qiáng)作用,隨著T型梁有效翼緣寬度的增加,梁中的非彈性耗能減少,底層框架柱非彈性耗能增加;總體上梁的利用率降低,柱的利用率提高,特別是底層柱;底層層間位移角增大;結(jié)構(gòu)發(fā)生“強(qiáng)梁弱柱”式破壞的可能性增大。3.以汶川地震中倒塌的漩口中學(xué)前教學(xué)樓作為原型,建立三個(gè)分析模型:裸框架模型,按美國(guó)ACI規(guī)范和新西蘭NZS3101規(guī)范分別計(jì)算T型梁有效翼緣寬度的模型。進(jìn)一步研究T梁有效翼緣寬度取值對(duì)鋼筋混凝土框架結(jié)構(gòu)“強(qiáng)梁弱柱”式破壞的影響。通過對(duì)比梁抗彎承載力,發(fā)現(xiàn)樓板能顯著提高梁端負(fù)彎矩承載力并影響“強(qiáng)梁弱柱”機(jī)制的形成。通過對(duì)比結(jié)構(gòu)和構(gòu)件耗能、構(gòu)件利用率和結(jié)構(gòu)層間位移,得出樓板提高了梁的剛度和強(qiáng)度,降低了梁的耗能能力,而使底層柱在強(qiáng)地震動(dòng)下的非彈性耗能、利用率增大,底層的層間最大位移角增大,使底層優(yōu)先形成薄弱層,增大了結(jié)構(gòu)倒塌的風(fēng)險(xiǎn),提高了結(jié)構(gòu)發(fā)生“強(qiáng)梁弱柱”式破壞的可能性。
[Abstract]:During the Wenchuan earthquake and the Yushu earthquake, many reinforced concrete frame structures designed according to the current codes have the "strong beam weak column" failure, which is avoided in the seismic design of the structure, rather than the expected ductile failure mechanism of "strong column weak beam". This kind of earthquake damage phenomenon has aroused the researchers' high attention, and has carried out the related research. On the basis of systematically summarizing the related research at home and abroad, this paper mainly studies the influence of floor slab on the failure of "strong beam and weak column" from three angles of structure and component energy dissipation, member utilization ratio and interstory displacement angle. The main work is as follows: 1. The relative regulations of national codes for strong columns and weak beams are compared and reviewed. The design idea of "strong column and weak beam" in national codes is to increase the bending moment at the end of column. The difference lies in the consideration of floor slab when calculating the design moment of beam end: one is to calculate the design moment of beam end according to the original section of beam, and indirectly consider the influence of floor slab by increasing the value of increasing coefficient of bending moment at the end of column; The other is to convert the strengthening effect of floor slab to the beam in a certain range, participate in the bending of the beam, and calculate the design moment of the beam end according to the T-section. The effect of floor slab on seismic response of RC frame structure under different intensity ground motion is studied. By simplifying the joint action of beam and floor into T-shaped beams with different effective flange widths, four analytical models are established and their nonlinear seismic responses are analyzed. From the comparative analysis of structure and component energy consumption, member utilization ratio and interstory displacement angle, it is found that when the local vibration intensity is not greater than that of the original structural fortification intensity, when the earthquake occurs, because of the strengthening effect of the floor on the beam, With the increase of the effective flange width of T-beam, the inelastic energy dissipation in the beam decreases, but the inelastic energy dissipation of the column does not increase. When the local vibration intensity is greater than the intensity of the original structure, the inelastic energy consumption in the beam decreases with the increase of the effective flange width of the T-beam due to the strengthening effect of the floor slab on the beam when the local vibration intensity is greater than that of the original structure. The inelastic energy dissipation of the bottom frame column increases; the utilization ratio of the overall upper beam decreases, the utilization ratio of the column increases, especially the bottom column; the displacement angle between the bottom layers increases; and the possibility of "strong beam weak column" failure of the structure increases. Taking the Waikou middle school front teaching building collapsed in Wenchuan earthquake as the prototype, three analysis models are established: the bare frame model, and the effective flange width model of T-beam calculated according to the ACI code of USA and the NZS3101 code of New Zealand. The influence of effective flange width of T beam on the failure of reinforced concrete frame structure with "strong beam and weak column" is further studied. By comparing the bending bearing capacity of beams, it is found that floor slab can significantly increase the bearing capacity of negative bending moment at the end of beam and influence the formation of "strong beam and weak column" mechanism. By comparing the energy consumption of the structure and the members, the utilization ratio of the members and the displacement between the structures, it is concluded that the floor slab improves the stiffness and strength of the beam, reduces the energy dissipation capacity of the beam, and makes the inelastic energy dissipation of the bottom column under strong ground motion increase. With the increase of the maximum displacement angle of the bottom layer, the weak layer is formed first, the risk of structural collapse is increased, and the possibility of "strong beam and weak column" failure of the structure is increased.
【學(xué)位授予單位】：中國(guó)地震局工程力學(xué)研究所
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU375.4

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