發(fā)布時間：2018-05-15 05:22

  本文選題：強梁弱柱 + 樓板�。� 參考：《中國地震局工程力學研究所》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)范設計的鋼筋混凝土框架結構出現(xiàn)了結構抗震設計中極力避免的“強梁弱柱”式破壞,而不是預期的“強柱弱梁”延性破壞機制。這種震害現(xiàn)象引起了研究人員的高度關注,并開展了相關研究。本文在系統(tǒng)總結國內外相關研究的基礎上,主要從結構和構件耗能、構件利用率與層間位移角三個角度,就樓板對“強梁弱柱”式破壞的影響進行了研究,主要工作如下:1.對比評述了各國規(guī)范對“強柱弱梁”的相關規(guī)定。各國規(guī)范對于“強柱弱梁”的設計思想都是采用增大柱端彎矩的方法。區(qū)別在于計算梁端設計彎矩時,對樓板的考慮:一種是按梁原截面計算梁端設計彎矩,通過提高柱端彎矩增大系數(shù)的取值,間接考慮樓板影響;另一種是將樓板對梁的加強作用折算成一定范圍內的板,參與梁受彎,按T型截面計算梁端設計彎矩。2.研究在不同強度水平地震動作用下,樓板對RC框架結構地震反應的影響。通過將梁和樓板的共同作用簡化為不同有效翼緣寬度的T型梁,建立四個分析模型,并對其進行非線性地震反應分析。從結構和構件耗能、構件利用率和層間位移角三個角度的對比分析,發(fā)現(xiàn):1)當?shù)卣饎訌姸炔淮笥谠�結構設防烈度的罕遇地震時,由于樓板對梁的加強作用,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;框架結構中的主要受力構件(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?shù)卣饎訌姸却笥谠�結構設防烈度的罕遇地震時,由于樓板對梁的加強作用,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;結構發(fā)生“強梁弱柱”式破壞的可能性增大。3.以汶川地震中倒塌的漩口中學前教學樓作為原型,建立三個分析模型:裸框架模型,按美國ACI規(guī)范和新西蘭NZS3101規(guī)范分別計算T型梁有效翼緣寬度的模型。進一步研究T梁有效翼緣寬度取值對鋼筋混凝土框架結構“強梁弱柱”式破壞的影響。通過對比梁抗彎承載力,發(fā)現(xiàn)樓板能顯著提高梁端負彎矩承載力并影響“強梁弱柱”機制的形成。通過對比結構和構件耗能、構件利用率和結構層間位移,得出樓板提高了梁的剛度和強度,降低了梁的耗能能力,而使底層柱在強地震動下的非彈性耗能、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,增大了結構倒塌的風險,提高了結構發(fā)生“強梁弱柱”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.
【學位授予單位】：中國地震局工程力學研究所
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU375.4

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