本文關(guān)鍵詞：RC柱考慮剪切作用的抗震性能和殘余變形研究　出處：《大連理工大學(xué)》2014年博士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 鋼筋混凝土柱 抗震性能 彎剪破壞 荷載一變形曲線(xiàn) 殘余變形 統(tǒng)計(jì)分析

【摘要】：針對(duì)地震中許多鋼筋混凝土柱、橋墩和樁等壓彎構(gòu)件出現(xiàn)彎剪(或剪切)破壞的現(xiàn)象及我國(guó)現(xiàn)行規(guī)范中結(jié)構(gòu)(或構(gòu)件)抗震設(shè)計(jì)方法不完善的問(wèn)題,如缺少針對(duì)彎剪破壞柱的受力分析模型、未明確給出震后結(jié)構(gòu)性能評(píng)估方法及可修復(fù)性方面的要求等,本文就不同加載模式下彎剪破壞鋼筋混凝土柱的抗震性能退化機(jī)理、剪切作用對(duì)柱抗震性能影響及柱震后殘余變形計(jì)算等方面進(jìn)行了研究,主要包括以下幾個(gè)方面： 1.對(duì)10組(20根)不同剪跨比和配箍率的鋼筋混凝土柱試件分別進(jìn)行單調(diào)和低周反復(fù)加載試驗(yàn),研究了兩種加載方式對(duì)柱地震破壞模式、水平承載力及變形性能等的影響。結(jié)果表明,與單調(diào)加載相比,反復(fù)加載下柱的抗剪承載力和剛度隨變形增加退化更明顯,易發(fā)生以剪切為主的破壞(彎剪破壞或剪切破壞)；柱的變形能力在反復(fù)加載下因滯回耗能和損傷累積會(huì)產(chǎn)生循環(huán)退化效應(yīng),且隨加載循環(huán)次數(shù)的增多和位移幅值的增大趨于明顯,尤其是在峰值荷載后；基于本文試驗(yàn)結(jié)果分析,提出了彎剪破壞鋼筋混凝土柱單調(diào)荷載-變形曲線(xiàn)與反復(fù)荷載滯回曲線(xiàn)包絡(luò)線(xiàn)之間關(guān)系的分析模型。 2.基于本文試驗(yàn)結(jié)果,同時(shí)考慮彎曲、滑移及剪切變形分量對(duì)彎剪破壞鋼筋混凝土柱總側(cè)向變形的影響,提出了彎剪破壞柱屈服點(diǎn)、峰值點(diǎn)及破壞點(diǎn)3個(gè)受力特征點(diǎn)對(duì)應(yīng)水平荷載和變形的計(jì)算模型,并據(jù)此提出了彎剪破壞柱荷載-變形關(guān)系(曲線(xiàn))的簡(jiǎn)化計(jì)算方法。 3.基于彎剪破壞鋼筋混凝土柱的受力特點(diǎn),并結(jié)合對(duì)已有柱抗震性能試驗(yàn)數(shù)據(jù)的分析,在傳統(tǒng)的纖維分析模型(彎曲變形分析模型)和滑移變形分析模型基礎(chǔ)上采用修正公式考慮剪切作用影響,提出了適用于地震作用下彎剪破壞柱荷載-變形關(guān)系全過(guò)程分析的實(shí)用方法。 4.基于彎剪破壞鋼筋混凝土柱滯回特性及試驗(yàn)結(jié)果的分析,建立了彎剪破壞柱等效阻尼比計(jì)算模型；利用該模型建立柱地震反應(yīng)的“需求曲線(xiàn)”,并采用研究?jī)?nèi)容(3)提出的方法建立柱的“能力曲線(xiàn)”,提出了考慮剪切作用影響的鋼筋混凝土柱最大地震位移反應(yīng)分析方法。 5.基于對(duì)多條地震波作用下單自由度(SDOF)體系彈塑性地震響應(yīng)(最大彈塑性變形和殘余變形)的統(tǒng)計(jì)分析,研究了自振周期、剛度比、相對(duì)屈服力系數(shù)、峰值地面加速度及滯回模型對(duì)結(jié)構(gòu)地震殘余變形的影響；同時(shí)結(jié)合理論分析,建立了基于概率的鋼筋混凝土柱(構(gòu)件)地震殘余變形計(jì)算模型。
[Abstract]:Aiming at the phenomenon of bending shear (or shear) failure of many reinforced concrete columns, piers and piles, and the imperfect seismic design methods of structures (or members) in the current code of our country. Such as the lack of bending shear failure column force analysis model, failure to give a clear post-earthquake structural performance evaluation method and repairable requirements and so on. In this paper, the degradation mechanism of seismic behavior of reinforced concrete columns under different loading modes, the effect of shear action on the seismic behavior of columns and the calculation of residual deformation of columns after earthquake are studied. It mainly includes the following aspects: 1. The seismic failure modes of reinforced concrete columns with different shear span ratio and hoop ratio were studied by monotonic and low-cycle repeated loading tests. The results show that the shear capacity and stiffness of the columns under repeated loading are more obvious with the increase of deformation than those under monotonic loading. The main failure is shear failure (bending shear failure or shear failure); The deformation capacity of columns under repeated loading will produce cyclic degradation effect due to hysteretic energy dissipation and damage accumulation, and it tends to be obvious with the increase of loading cycles and displacement amplitude, especially after the peak load. Based on the analysis of the experimental results in this paper, an analytical model of the relationship between the monotone load-deformation curve and the hysteresis curve envelope of bending shear failure reinforced concrete column is proposed. 2. Based on the experimental results in this paper, and considering the effects of bending, slip and shear deformation components on the total lateral deformation of reinforced concrete columns, the yield point of flexural shear failure columns is proposed. Three stress characteristic points of peak point and failure point correspond to the calculation model of horizontal load and deformation, and a simplified calculation method of load-deformation relation (curve) of bending and shear failure column is put forward. 3. Based on the mechanical characteristics of reinforced concrete columns subjected to flexural shear failure, combined with the analysis of seismic performance test data of existing columns. Based on the traditional fiber analysis model (bending deformation analysis model) and slip deformation analysis model, the modified formula is used to consider the effect of shear action. A practical method for the analysis of load-deformation relationship of bending and shear failure columns under earthquake is presented. 4. Based on the analysis of hysteretic characteristics and experimental results of flexural shear failure reinforced concrete columns, the equivalent damping ratio calculation model of flexural shear failure columns is established. The "demand curve" of column seismic response is established by using this model, and the "capacity curve" of column is established by using the method proposed in this paper. A method for maximum seismic displacement response analysis of reinforced concrete columns considering shear effect is presented. 5. Based on the statistical analysis of elastoplastic seismic response (maximum elastic-plastic deformation and residual deformation) of SDOF system, the natural vibration period and stiffness ratio are studied. The influence of relative yield force coefficient, peak ground acceleration and hysteretic model on residual deformation of structures; Based on the theoretical analysis, a probabilistic model for calculating residual deformation of reinforced concrete columns (members) is established.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU375.3;TU352.11

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