型鋼超高強(qiáng)混凝土柱受力性能的研究
發(fā)布時(shí)間：2019-04-08 19:19
【摘要】：型鋼超高強(qiáng)混凝土柱能發(fā)揮型鋼和超高強(qiáng)混凝土各自的特點(diǎn),并在高軸壓力水平時(shí)利用型鋼對(duì)核心區(qū)混凝土的約束,提高柱的延性以及峰后強(qiáng)度,故其在地震區(qū)的高層、超高層建筑中有較為廣闊的應(yīng)用前景。但是已有的針對(duì)型鋼超高強(qiáng)混凝土柱受力性能的研究較少,且取得的成果并不理想。因此,本文擬系統(tǒng)地研究各設(shè)計(jì)參數(shù)對(duì)型鋼超高強(qiáng)混凝土柱受力性能(包括彎曲性能、軸心受壓性能和抗震性能)的影響；采用合理的方法改善型鋼超高強(qiáng)混凝土柱的受力性能,并著重改善高軸壓力水平時(shí)型鋼超高強(qiáng)混凝土柱的抗震性能；建立合理的型鋼超高強(qiáng)混凝土柱的軸心受壓、正截面抗彎和斜截面受剪承載力計(jì)算方法。主要研究?jī)?nèi)容和結(jié)論如下： (1)采用截面纖維單元分析法,編制了截面彎矩-曲率全過(guò)程分析程序。該方法考慮屈曲對(duì)縱筋、型鋼受壓應(yīng)力-應(yīng)變關(guān)系的影響,考慮箍筋和型鋼對(duì)混凝土的約束作用。運(yùn)用該分析方法及計(jì)算程序較為系統(tǒng)地研究了各參數(shù)對(duì)型鋼超高強(qiáng)混凝土柱彎曲性能的影響,并推薦了較為合理的型鋼超高強(qiáng)混凝土柱的截面形式。 (2)開(kāi)展10根長(zhǎng)細(xì)比為3.0的型鋼超高強(qiáng)混凝土短柱的軸心受壓試驗(yàn)。研究了各參數(shù)對(duì)試件的軸心受壓性能(破壞形態(tài)、軸力-應(yīng)變關(guān)系曲線、軸向承載力和延性)的影響。研究結(jié)果表明：當(dāng)箍筋約束效果較好時(shí),型鋼對(duì)柱受力性能的改善效果更明顯；采用推薦的截面形式,柱的軸心受壓性能較好。在上述研究的基礎(chǔ)上建立了型鋼超高強(qiáng)混凝土短柱的軸心受壓承載力計(jì)算公式。 (3)開(kāi)展21根剪跨比為3.0的型鋼超高強(qiáng)混凝土中長(zhǎng)柱的低周反復(fù)加載試驗(yàn),試驗(yàn)設(shè)計(jì)參數(shù)為軸壓力水平、箍筋、型鋼和是否配置栓釘。研究了各參數(shù)對(duì)中長(zhǎng)柱試件的抗震性能(破壞形態(tài)、滯回性能、耗能能力和變形能力、水平承載力以及剛度和強(qiáng)度退化等)的影響。研究結(jié)果表明：合理配置箍筋和型鋼,試驗(yàn)軸壓比為0.38或0.45的試件仍具有很好的變形能力和耗能能力,即型鋼超高強(qiáng)混凝土中長(zhǎng)柱具有非常好的抗震性能；基于平截面假定理論的正截面抗彎承載力計(jì)算公式適用于型鋼超高強(qiáng)混凝土柱的正截面抗彎承載力計(jì)算。 (4)開(kāi)展6根剪跨比為2.0的型鋼超高強(qiáng)混凝土短柱的低周反復(fù)加載試驗(yàn),試驗(yàn)設(shè)計(jì)參數(shù)為軸壓力水平和箍筋,研究了各參數(shù)對(duì)短柱試件的抗震性能的影響。研究結(jié)果表明：合理配置箍筋時(shí),試驗(yàn)軸壓比為0.38的試件具有很好的變形能力和耗能能力,即型鋼超高強(qiáng)混凝土短柱具有較好的抗震性能。最后,基于延性的抗震設(shè)計(jì)思想,建議了型鋼超高強(qiáng)混凝土柱的軸壓比限值、柱端箍筋加密區(qū)長(zhǎng)度和箍筋加密區(qū)的最小配箍要求。 (5)基于修正壓力場(chǎng)理論提出型鋼超高強(qiáng)混凝土柱的受剪承載力計(jì)算模型。該模型通過(guò)柱端截面中心正應(yīng)變?chǔ)?來(lái)考慮軸力、彎矩和剪力的相互作用,并通過(guò)關(guān)鍵參數(shù)混凝土主壓應(yīng)力角θ和平均縱向應(yīng)變?chǔ)舩來(lái)反映剪跨比、軸向力以及配箍對(duì)柱受剪承載力的影響。模型計(jì)算所得受剪承載力與試驗(yàn)值吻合較好,可用于型鋼超高強(qiáng)(高強(qiáng))混凝土柱的受剪分析和設(shè)計(jì)。
[Abstract]:The section steel super-high-strength concrete column can play the respective characteristics of the section steel and the ultra-high-strength concrete, and can restrain the concrete in the core area by the section steel at the high-shaft pressure level, improve the ductility of the column and the post-peak strength, so that the steel-section steel super-high-strength concrete column is at a high level in the seismic region, The high-rise building has a wide application prospect. However, the existing research on the force performance of the steel super-high-strength concrete column is less, and the results obtained are not ideal. Therefore, the influence of each design parameter on the force performance of the super-high strength concrete column (including the bending performance, the axial compression performance and the anti-seismic performance) of the section steel is systematically studied. The reasonable method is used to improve the stress performance of the steel super-high-strength concrete column. In addition, the anti-seismic performance of the steel super-high-strength concrete column under the high-shaft pressure level is emphatically improved, and the calculation method of the axial compression, the positive-section bending and the oblique section of the steel super-high-strength concrete column under the axial compression of the steel super-high-strength concrete column is established. The main contents and conclusions are as follows: (1) The process of cross-section bending moment-curvature process is developed by means of section fiber unit analysis. The influence of the buckling on the stress-strain relationship of the longitudinal bar and the section steel is considered, and the restraint of the stirrups and the section steel on the concrete is considered. In this paper, the influence of each parameter on the bending performance of the super-high strength concrete column is studied systematically by using the analysis method and the calculation program, and the section shape of the more reasonable section steel super-high-strength concrete column is recommended. and (2) carrying out 10-root steel-steel super-high-strength concrete short columns with a 10-root length and a fine ratio of 3.0, Pressure test. The axial compression performance (damage form, axial force-strain relation curve, axial bearing capacity and ductility) of each parameter to the test piece is studied. The results show that, when the effect of the stirrup is good, the effect of the section steel on the performance of the column is more obvious; the recommended cross-sectional form and the axial compression of the column are used. It can be better. On the basis of the above-mentioned research, the axial compression bearing capacity of the steel super-high-strength concrete short column is established. The formula is calculated. (3) The low-cycle and repeated loading test of the long column in the section steel super-high-strength concrete with the cross-span ratio of 3.0 is carried out. The design parameters of the test are the shaft pressure level, the stirrups, the section steel and the section steel. No bolt is configured. The anti-seismic performance (damage form, hysteretic behavior, energy dissipation ability and deformation ability, horizontal bearing capacity, stiffness and strength degradation) of the middle-long column test piece are studied. The results show that the test piece with the axial compression ratio of 0.38 or 0.45 has good deformation ability and energy dissipation ability, that is, the long column in the steel super-high-strength concrete is very good. The calculation formula of the flexural capacity of the positive section based on the assumption theory of the flat section is applicable to the bending moment of the positive section of the section steel ultra-high strength concrete column. The bearing capacity calculation is carried out. (4) The low-cycle and repeated loading test of the steel super-high-strength concrete short column with six shear-span ratio of 2.0 is carried out. The design parameters of the test are the shaft pressure level and the stirrups, and the short-column test pieces for each parameter are studied. The results show that, when the stirrups are reasonably arranged, the test pieces with the axial compression ratio of 0.38 have good deformation and energy dissipation capability. Finally, on the basis of the anti-seismic design idea of ductility, the axial compression ratio limit, the length of the column end hoop and the encryption area of the stirrups are proposed. and (5) based on the modified pressure field theory, a section steel ultra-high strength concrete column is proposed The shear-bearing capacity calculation model is used to study the interaction of axial force, bending moment and shear force through the positive strain ratio 0 of the central section of the column end, and the shear span ratio, the axial force and the coupling pair are reflected by the main pressure stress angle and the average longitudinal strain ratio x of the key parameter concrete. The shear bearing capacity of the column is affected by the shear bearing capacity of the column. The calculated shear bearing capacity of the model is in good agreement with the test value and can be used for the section steel ultra-high strength (high-strength) concrete.
【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)】：TU398.9
[Abstract]:The section steel super-high-strength concrete column can play the respective characteristics of the section steel and the ultra-high-strength concrete, and can restrain the concrete in the core area by the section steel at the high-shaft pressure level, improve the ductility of the column and the post-peak strength, so that the steel-section steel super-high-strength concrete column is at a high level in the seismic region, The high-rise building has a wide application prospect. However, the existing research on the force performance of the steel super-high-strength concrete column is less, and the results obtained are not ideal. Therefore, the influence of each design parameter on the force performance of the super-high strength concrete column (including the bending performance, the axial compression performance and the anti-seismic performance) of the section steel is systematically studied. The reasonable method is used to improve the stress performance of the steel super-high-strength concrete column. In addition, the anti-seismic performance of the steel super-high-strength concrete column under the high-shaft pressure level is emphatically improved, and the calculation method of the axial compression, the positive-section bending and the oblique section of the steel super-high-strength concrete column under the axial compression of the steel super-high-strength concrete column is established. The main contents and conclusions are as follows: (1) The process of cross-section bending moment-curvature process is developed by means of section fiber unit analysis. The influence of the buckling on the stress-strain relationship of the longitudinal bar and the section steel is considered, and the restraint of the stirrups and the section steel on the concrete is considered. In this paper, the influence of each parameter on the bending performance of the super-high strength concrete column is studied systematically by using the analysis method and the calculation program, and the section shape of the more reasonable section steel super-high-strength concrete column is recommended. and (2) carrying out 10-root steel-steel super-high-strength concrete short columns with a 10-root length and a fine ratio of 3.0, Pressure test. The axial compression performance (damage form, axial force-strain relation curve, axial bearing capacity and ductility) of each parameter to the test piece is studied. The results show that, when the effect of the stirrup is good, the effect of the section steel on the performance of the column is more obvious; the recommended cross-sectional form and the axial compression of the column are used. It can be better. On the basis of the above-mentioned research, the axial compression bearing capacity of the steel super-high-strength concrete short column is established. The formula is calculated. (3) The low-cycle and repeated loading test of the long column in the section steel super-high-strength concrete with the cross-span ratio of 3.0 is carried out. The design parameters of the test are the shaft pressure level, the stirrups, the section steel and the section steel. No bolt is configured. The anti-seismic performance (damage form, hysteretic behavior, energy dissipation ability and deformation ability, horizontal bearing capacity, stiffness and strength degradation) of the middle-long column test piece are studied. The results show that the test piece with the axial compression ratio of 0.38 or 0.45 has good deformation ability and energy dissipation ability, that is, the long column in the steel super-high-strength concrete is very good. The calculation formula of the flexural capacity of the positive section based on the assumption theory of the flat section is applicable to the bending moment of the positive section of the section steel ultra-high strength concrete column. The bearing capacity calculation is carried out. (4) The low-cycle and repeated loading test of the steel super-high-strength concrete short column with six shear-span ratio of 2.0 is carried out. The design parameters of the test are the shaft pressure level and the stirrups, and the short-column test pieces for each parameter are studied. The results show that, when the stirrups are reasonably arranged, the test pieces with the axial compression ratio of 0.38 have good deformation and energy dissipation capability. Finally, on the basis of the anti-seismic design idea of ductility, the axial compression ratio limit, the length of the column end hoop and the encryption area of the stirrups are proposed. and (5) based on the modified pressure field theory, a section steel ultra-high strength concrete column is proposed The shear-bearing capacity calculation model is used to study the interaction of axial force, bending moment and shear force through the positive strain ratio 0 of the central section of the column end, and the shear span ratio, the axial force and the coupling pair are reflected by the main pressure stress angle and the average longitudinal strain ratio x of the key parameter concrete. The shear bearing capacity of the column is affected by the shear bearing capacity of the column. The calculated shear bearing capacity of the model is in good agreement with the test value and can be used for the section steel ultra-high strength (high-strength) concrete.
【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)】：TU398.9
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