本文選題：鋼管再生混凝土 + 構(gòu)件　； 參考：《廣西大學(xué)》2014年博士論文

【摘要】：鋼管再生混凝土結(jié)構(gòu)是鋼管普通混凝土結(jié)構(gòu)和再生混凝土結(jié)構(gòu)相結(jié)合而產(chǎn)生的一種新型結(jié)構(gòu)體系,它不僅繼承了鋼管普通混凝土結(jié)構(gòu)的承載力高、抗震性能好等優(yōu)點(diǎn),而且有效地解決了建筑垃圾的資源化再利用問題。課題組已對鋼管再生混凝土構(gòu)件的基本受壓性能進(jìn)行了研究,在此基礎(chǔ)上本文對鋼管再生混凝土構(gòu)件及其框架的抗震性能進(jìn)行了深入、系統(tǒng)的研究。 以再生粗骨料取代率、長細(xì)比、軸壓比和含鋼率為變化參數(shù),進(jìn)行了低周反復(fù)荷載作用下10個(gè)圓形和6個(gè)方形鋼管再生混凝土柱試件的抗震試驗(yàn)。觀察了試件受力的全過程和破壞形態(tài),獲取了滯回曲線、骨架曲線、延性、耗能、強(qiáng)度衰減和剛度退化等各項(xiàng)抗震性能指標(biāo)。結(jié)果表明：試件的滯回曲線飽滿；圓形試件的位移延性系數(shù)大于3,方形試件接近3；圓形試件破壞時(shí)位移轉(zhuǎn)角介于1/28～1/17之間,方形試件介于1/21～1/17之間；破壞時(shí)圓形試件的等效粘滯阻尼系數(shù)介于0.305～0.460之間；方形試件介于0.323～0.360之間；基于抗震性能指標(biāo)需求,再生混凝土用于鋼管混凝土工程承重結(jié)構(gòu)之中是可行的。 以100%為再生粗骨料取代率,進(jìn)行了低周反復(fù)荷載作用下一榀圓鋼管再生混凝土柱-鋼筋再生混凝土梁和一榀方鋼管再生混凝土柱-鋼筋再生混凝土梁框架試件的抗震試驗(yàn)。結(jié)果表明：框架在設(shè)計(jì)方法上滿足了“強(qiáng)柱弱梁、強(qiáng)剪弱彎、強(qiáng)節(jié)點(diǎn),弱構(gòu)件”等抗震設(shè)計(jì)要求；框架滯回曲線對稱,呈現(xiàn)出比較飽滿的梭形；框架位移延性系數(shù)均大于3；圓形試件破壞位移轉(zhuǎn)角為1/33,方形試件為1/24；破壞時(shí)圓形試件等效粘滯阻尼系數(shù)為0.243,方形試件為0.216。鋼管再生混凝土柱-鋼筋再生混凝土梁框架表現(xiàn)出了良好的抗震性能。 根據(jù)等效塑性鉸理論,計(jì)算得到的圓形鋼管再生混凝土柱試件的塑性鉸長度介于(0.45～0.95)h之間,方形試件介于(0.65～0.75)h之間；通過采用定點(diǎn)指向、位移幅值承載力突降、模型軟化點(diǎn)等特殊處理方法,建立了低周反復(fù)荷載作用下鋼管再生混凝土構(gòu)件的三折線恢復(fù)力模型,較好地反映了構(gòu)件荷載與位移的滯回關(guān)系；通過引入多種地震損傷評估模型,全方位的評價(jià)了鋼管再生混凝土構(gòu)件損傷發(fā)展過程和抗震能力。 考慮了取代率影響因子,修正了現(xiàn)有的核心混凝土的受壓本構(gòu)關(guān)系,并采用有限元軟件Abaqus對鋼管再生混凝土構(gòu)件進(jìn)行抗震性能分析,計(jì)算得到的滯回曲線與實(shí)測結(jié)果吻合較好。在現(xiàn)有有限元模型的基礎(chǔ)之上,進(jìn)行了抗震性能拓展分析,得到了不同單參數(shù)變化試件的抗震性能指標(biāo),探討了再生粗骨料取代率、含鋼率、鋼材牌號、軸壓比、長細(xì)比以及截面高寬比對抗震性能指標(biāo)的影響規(guī)律。 根據(jù)實(shí)測滯回曲線、骨架曲線以及剛度退化規(guī)律,建立了低周反復(fù)荷載作用下鋼管再生混凝土框架的三折線恢復(fù)力模型,較好地反映了框架荷載與位移的滯回關(guān)系；基于試驗(yàn)結(jié)果,探討了單層單跨鋼管再生混凝土框架的層間受剪承載力的設(shè)計(jì)計(jì)算方法；通過引入基于變形和累積耗能控制的雙參數(shù)地震損傷模型,有效的評價(jià)了鋼管再生混凝士框架損傷發(fā)展過程和抗震能力；基于性能設(shè)計(jì),劃分鋼管再生混凝土結(jié)構(gòu)的性能水準(zhǔn)為正常使用、暫時(shí)使用、修復(fù)后使用、生命安全和防止倒塌五檔,選用水平位移角和損傷變量作為量化指標(biāo),確定了基于一定保證率下的水平位移角和損傷指標(biāo)限值,建立了在不同地震設(shè)防水準(zhǔn)下不同性能水準(zhǔn)所對應(yīng)的性能目標(biāo)。
[Abstract]:Steel tube recycled concrete structure is a new kind of structural system which is produced by the combination of ordinary concrete structure and recycled concrete structure . It not only inherits the advantages of high bearing capacity , good aseismatic performance and so on of ordinary concrete structure of steel pipe , but also effectively solves the problem of resource recycling of building garbage .

The anti - seismic tests of 10 circular and 6 square steel tube recycled concrete columns under low - cycle repeated loading are carried out with the substitution rate of recycled coarse aggregate , length - to - fine ratio , axial - pressure ratio and steel - containing rate . The whole process and failure mode of the stress of the test piece are observed , and the seismic performance indexes such as hysteretic curve , skeleton curve , ductility , energy consumption , strength attenuation and stiffness degradation are obtained .
the displacement ductility coefficient of the circular test piece is greater than 3 , and the square test piece is close to 3 ;
the displacement angle is between 1 / 28 and 1 / 17 when the circular test piece is damaged , and the square test piece is between 1 / 21 and 1 / 17 ;
The equivalent viscous damping coefficient of the circular test piece is between 0.305 and 0.460 .
the square test piece is between 0.323 and 0.360 ;
Based on the demand of anti - seismic performance index , recycled concrete is feasible in the bearing structure of steel tube concrete engineering .

An anti - seismic test of a circular steel tube recycled concrete column - reinforced concrete beam and a square steel tube recycled concrete beam frame test piece is carried out with 100 % as the replacement rate of the recycled coarse aggregate . The results show that the frame is designed to meet the seismic design requirements of " strong column weak beam , strong shear weak bending , strong node and weak component " .
The hysteresis curve of the frame is symmetrical , which shows a more full spindle shape .
the ductility coefficient of the frame is greater than 3 ;
the angle of failure displacement of the circular test piece is 1 / 33 , and the square test piece is 1 / 24 ;
The equivalent viscous damping coefficient of circular test piece is 0.243 , and the square test piece is 0.216 . The steel tube recycled concrete column - reinforced concrete beam frame shows good seismic behavior .

According to the theory of equivalent plastic hinge , the plastic hinge length of the obtained circular steel tube recycled concrete column is between ( 0.45 ~ 0.95 ) h , and the square test piece is between ( 0.65 ~ 0.75 ) h ;
By using the special treatment methods such as pointing , displacement amplitude bearing capacity and model softening point , the three - fold line restoring force model of steel tube recycled concrete member under low - cycle repeated loading is established , which can reflect the hysteretic relationship between component load and displacement .
By introducing a variety of seismic damage assessment models , the damage development process and seismic capacity of steel tube recycled concrete members were evaluated in all directions .

In this paper , the influence factors of substitution rate are taken into consideration , the compression constitutive relation of the existing core concrete is corrected , and the seismic performance analysis of the steel tube recycled concrete member is carried out by using the finite element software Abaqus . The seismic performance expansion analysis is carried out on the basis of the existing finite element model .

According to the measured hysteretic curve , the skeleton curve and the rule of stiffness degradation , a three - fold restoring force model of the steel tube regeneration concrete frame under the action of low - cycle repeated loading is established , and the hysteretic relationship of the frame load and displacement is well reflected ;
Based on the experimental results , the design and calculation method of shear bearing capacity of single - layer single - span steel tube recycled concrete frame is discussed .
By introducing the two - parameter seismic damage model based on deformation and cumulative energy consumption control , the damage development process and seismic capacity of the concrete filled steel tube regeneration concrete frame are effectively evaluated .
Based on the performance design , the performance level of the steel tube recycled concrete structure is divided into normal use , temporary use , post - repair use , life safety and prevention of collapse , the horizontal displacement angle and the damage variable are selected as the quantitative indexes , and the performance targets corresponding to different performance levels at different seismic fortification levels are established .
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU398.9;TU352.11

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