本文選題：型鋼再生混凝土 + 柱��； 參考：《西安建筑科技大學》2013年博士論文

【摘要】：型鋼再生混凝土組合結(jié)構(gòu)融合了普通型鋼混凝土結(jié)構(gòu)承載能力高、抗震性能好的優(yōu)點和再生混凝土節(jié)能環(huán)保、可再生利用的顯著特點，不但可以提高建筑結(jié)構(gòu)的抗震防災能力，還符合國家綠色環(huán)保和可持續(xù)發(fā)展的戰(zhàn)略，因此具有廣闊的發(fā)展應用前景。本文通過試驗和理論手段，系統(tǒng)研究了型鋼再生混凝土柱在低周反復荷載下的力學性能，并提出了相關(guān)設(shè)計計算理論。 根據(jù)再生混凝土特點和組合結(jié)構(gòu)要求，設(shè)計配制了滿足強度要求的再生混凝土材料。在此基礎(chǔ)上，本文共設(shè)計制作了17個型鋼再生混凝土柱試件，設(shè)計參數(shù)主要包括再生粗骨料取代率、剪跨比、軸壓比以及體積配箍率；通過各柱構(gòu)件的低周反復荷載試驗，主要研究了柱構(gòu)件的破壞過程及破壞形態(tài)特征；分析了柱構(gòu)件在反復荷載作用下的滯回曲線與骨架曲線。在此基礎(chǔ)上，對柱構(gòu)件的抗震承載力、剛度退化、強度衰減、耗能能力、延性以及側(cè)移角等進行了詳細研究，并分析了設(shè)計參數(shù)對型鋼再生混凝土柱抗震性能的影響。 結(jié)合型鋼再生混凝土柱構(gòu)件的特征，并進行一定的簡化處理，采用OpenSees軟件對型鋼再生混凝土柱在低周反復荷載下的滯回性能進行了模擬分析，主要獲取了柱構(gòu)件的滯回曲線及骨架曲線，并將模擬結(jié)果與試驗結(jié)果進行了對比，，驗證了有限元分析結(jié)果的合理性。在此基礎(chǔ)上，分析了再生混凝土強度、型鋼強度、配鋼率以及箍筋強度對柱構(gòu)件抗震性能的影響。 根據(jù)型鋼再生混凝土柱滯回性能特點，建立了適合于型鋼再生混凝土柱的恢復力模型，該模型采用剛度退化四折線模型，包括骨架曲線模型、剛度退化規(guī)律以及滯回規(guī)則。利用理論推導和統(tǒng)計回歸的方法確定了骨架曲線模型中各個特征點，即開裂點、屈服點、峰值點以及極限點，且相應的給出了加載剛度和卸載剛度，并對計算骨架曲線與實測骨架曲線進行了對比，驗證了恢復力模型的合理性。 根據(jù)延性系數(shù)給出了保證型鋼再生混凝土柱具有較好抗震性能的試驗軸壓比限值。依據(jù)偏心受壓柱大小偏心受壓界限破壞理論，推導了發(fā)生彎曲破壞的型鋼再生混凝土柱軸壓比限值的計算方法，并結(jié)合試驗結(jié)果給出了相應的軸壓比限值；根據(jù)試驗軸壓比與延性的關(guān)系，給出了發(fā)生剪切斜壓破壞的型鋼再生混凝土柱軸壓比限值。在分析體積配箍率對柱構(gòu)件抗震延性有利影響的基礎(chǔ)上，給出了不同體積配箍率下型鋼再生混凝土柱的軸壓比限值。 根據(jù)試驗結(jié)果，研究了型鋼再生混凝土柱的水平承載力，并分析了再生粗骨料取代率、剪跨比、軸壓比以及體積配箍率對柱構(gòu)件水平承載力的影響。根據(jù)型鋼、箍筋以及縱筋的應變變化規(guī)律，研究了它們各自抵抗水平荷載作用的特點，并分析了型鋼再生混凝土柱在水平荷載作用下的受力機理。依據(jù)發(fā)生不同破壞形態(tài)的柱構(gòu)件受力機理特征，理論推導了柱構(gòu)件相應的水平承載力計算公式；并提出了型鋼再生混凝土柱水平承載力的實用計算公式。 根據(jù)型鋼截面受力特征，給出了型鋼與再生混凝土之間粘結(jié)應力的計算公式。通過在型鋼翼緣外側(cè)粘貼電阻應變片以獲得型鋼翼緣應變分布情況，分析了型鋼翼緣應變的分布規(guī)律，并對其進行多次回歸分析，獲得型鋼翼緣在不同荷載數(shù)級作用下的各應變點組成的數(shù)學描述曲線，并對該曲線進行求導，最后利用所給公式計算得到型鋼翼緣外側(cè)的等效粘結(jié)力。分析了型鋼再生混凝土柱粘結(jié)應力分析規(guī)律及特征；根據(jù)型鋼再生混凝土柱在反復荷載作用下的粘結(jié)退化機理及特征，并結(jié)合試驗結(jié)果，給出了柱構(gòu)件的粘結(jié)應力退化計算表達式。 結(jié)合試驗研究，分析了型鋼再生混凝土柱在低周反復荷載作用下的地震損傷特點，并對柱構(gòu)件的地震損傷進行了量化處理。在分析歸納現(xiàn)有地震損傷模型的基礎(chǔ)上，結(jié)合型鋼再生混凝土柱的特點，建立了基于變形和累積滯回耗能非線性組合的型鋼再生混凝土柱地震損傷模型。對計算損傷指數(shù)和試驗損傷指數(shù)進行了比較，驗證了柱構(gòu)件地震損傷模型的合理性；分析了再生粗骨料取代率、剪跨比、軸壓比以及體積配箍率對型鋼再生混凝土柱地震損傷性能的影響。
[Abstract]:The reinforced concrete composite structure combines the advantages of high bearing capacity , good aseismatic performance and the remarkable characteristics of recycled concrete energy saving , environment protection and sustainable development . It can not only improve the seismic disaster prevention capacity of the building structure , but also meet the national green environmental protection and sustainable development strategy . Therefore , this paper studies the mechanical properties of the SRC column under repeated loading at low cycle and puts forward the relevant design calculation theory .

According to the characteristics of recycled concrete and the requirements of combined structure , the recycled concrete material meeting the strength requirement has been designed and prepared . Based on this , 17 sections of recycled concrete column specimens have been designed and fabricated . The design parameters mainly include the substitution rate of recycled coarse aggregate , the shear span ratio , the axial compression ratio and the volume matching ratio .
Through the low - cycle repeated load test of each column component , the damage course of the column component and the characteristics of failure morphology are studied .
In this paper , the hysteretic curves and skeleton curves of column members under repeated loading are analyzed . On the basis of this , the seismic bearing capacity , stiffness degradation , strength attenuation , energy dissipation capacity , ductility and lateral displacement angle of column members are studied in detail . The influence of design parameters on the seismic behavior of SRC columns is analyzed .

Combined with the characteristics of SRC column components , the hysteretic behavior of SRC columns under low - cycle repeated loading is simulated and analyzed by OpenSees software . The results of simulation are compared with the experimental results , and the rationality of the results of finite element analysis is verified . On the basis of this , the influence of strength of recycled concrete , steel strength , steel distribution rate and hoop strength on seismic behavior of column members is analyzed .

Based on the characteristics of hysteretic behavior of SRC column , a model of restoring force suitable for SRC column is established . The model adopts four - fold model of stiffness degradation , including skeleton curve model , stiffness degradation law and hysteresis rule . The method of theoretical derivation and statistical regression is used to determine each feature point in skeleton curve model , namely , crack point , yield point , peak point and limit point , and the load stiffness and unload stiffness are given , and the calculation skeleton curve is compared with the measured skeleton curve , and the rationality of the restoring force model is verified .

According to the ductility coefficient , the limit value of the axial compression ratio of the reinforced concrete column with better seismic resistance is given . According to the eccentric compression limit damage theory of the eccentric compression column , the calculation method of the axial compression ratio limit of the SRC column with bending failure is deduced , and the corresponding limit value of the axial compression ratio is given in combination with the test results .
Based on the relationship between axial compression ratio and ductility , the limit of axial compression ratio of SRC column with shear slope failure has been given . On the basis of analyzing the influence of volume matching ratio on seismic ductility of column members , the axial compression ratio limits of SRC columns with different volume ratios are given .

According to the experimental results , the horizontal bearing capacity of SRC column is studied , and the influence of the substitution rate of recycled coarse aggregate , the ratio of shear - span ratio , axial compression ratio and the volume matching ratio on the horizontal bearing capacity of column members is analyzed . According to the rule of strain law of section steel , stirrup and longitudinal bar , the characteristics of their respective resistance to horizontal load are studied , and the stress mechanism of SRC column under horizontal load is analyzed .
A practical formula for calculating the horizontal bearing capacity of SRC column is presented .

According to the characteristic of section stress of section steel section , the formula for calculating the bond stress between section steel and recycled concrete is given . The distribution rule of strain distribution of section steel flange is analyzed by sticking resistance strain gauge on the outer side of section steel flange . The mathematical description curve of section steel flange ' s strain distribution under different loads is analyzed . Finally , the equivalent cohesive force on the outer side of section steel flange is obtained by using the given formula . The law and characteristics of bond stress analysis of SRC column are analyzed .
According to the mechanism and characteristics of bond degradation under repeated loading of SRC column , the calculation expression of bond stress degradation of column members is given .

Based on the analysis of the existing seismic damage model , the seismic damage model of the SRC column based on the combination of deformation and accumulated hysteretic energy consumption is established . The calculation damage index and the test damage index are compared , and the rationality of the seismic damage model of the column member is verified .
The influence of the substitution rate of recycled coarse aggregate , the ratio of shear span ratio , axial compression ratio and the volume matching ratio on the seismic damage performance of SRC column was analyzed .
【學位授予單位】：西安建筑科技大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU398.9;TU352.11

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