型钢超高强混凝土柱受力性能的研究
发布时间：2019-04-08 19:19
【摘要】：型钢超高强混凝土柱能发挥型钢和超高强混凝土各自的特点,并在高轴压力水平时利用型钢对核心区混凝土的约束,提高柱的延性以及峰后强度,故其在地震区的高层、超高层建筑中有较为广阔的应用前景。但是已有的针对型钢超高强混凝土柱受力性能的研究较少,且取得的成果并不理想。因此,本文拟系统地研究各设计参数对型钢超高强混凝土柱受力性能(包括弯曲性能、轴心受压性能和抗震性能)的影响；采用合理的方法改善型钢超高强混凝土柱的受力性能,并着重改善高轴压力水平时型钢超高强混凝土柱的抗震性能；建立合理的型钢超高强混凝土柱的轴心受压、正截面抗弯和斜截面受剪承载力计算方法。主要研究内容和结论如下： (1)采用截面纤维单元分析法,编制了截面弯矩-曲率全过程分析程序。该方法考虑屈曲对纵筋、型钢受压应力-应变关系的影响,考虑箍筋和型钢对混凝土的约束作用。运用该分析方法及计算程序较为系统地研究了各参数对型钢超高强混凝土柱弯曲性能的影响,并推荐了较为合理的型钢超高强混凝土柱的截面形式。 (2)开展10根长细比为3.0的型钢超高强混凝土短柱的轴心受压试验。研究了各参数对试件的轴心受压性能(破坏形态、轴力-应变关系曲线、轴向承载力和延性)的影响。研究结果表明：当箍筋约束效果较好时,型钢对柱受力性能的改善效果更明显；采用推荐的截面形式,柱的轴心受压性能较好。在上述研究的基础上建立了型钢超高强混凝土短柱的轴心受压承载力计算公式。 (3)开展21根剪跨比为3.0的型钢超高强混凝土中长柱的低周反复加载试验,试验设计参数为轴压力水平、箍筋、型钢和是否配置栓钉。研究了各参数对中长柱试件的抗震性能(破坏形态、滞回性能、耗能能力和变形能力、水平承载力以及刚度和强度退化等)的影响。研究结果表明：合理配置箍筋和型钢,试验轴压比为0.38或0.45的试件仍具有很好的变形能力和耗能能力,即型钢超高强混凝土中长柱具有非常好的抗震性能；基于平截面假定理论的正截面抗弯承载力计算公式适用于型钢超高强混凝土柱的正截面抗弯承载力计算。 (4)开展6根剪跨比为2.0的型钢超高强混凝土短柱的低周反复加载试验,试验设计参数为轴压力水平和箍筋,研究了各参数对短柱试件的抗震性能的影响。研究结果表明：合理配置箍筋时,试验轴压比为0.38的试件具有很好的变形能力和耗能能力,即型钢超高强混凝土短柱具有较好的抗震性能。最后,基于延性的抗震设计思想,建议了型钢超高强混凝土柱的轴压比限值、柱端箍筋加密区长度和箍筋加密区的最小配箍要求。 (5)基于修正压力场理论提出型钢超高强混凝土柱的受剪承载力计算模型。该模型通过柱端截面中心正应变ε0来考虑轴力、弯矩和剪力的相互作用,并通过关键参数混凝土主压应力角θ和平均纵向应变εx来反映剪跨比、轴向力以及配箍对柱受剪承载力的影响。模型计算所得受剪承载力与试验值吻合较好,可用于型钢超高强(高强)混凝土柱的受剪分析和设计。
[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.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：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.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU398.9
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相关期刊论文 前10条
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2 赵根田;王春花;高春彦;王晨霞;;钢骨混凝土偏心受压长柱受力性能试验研究[J];包头钢铁学院学报;2006年04期
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