型钢超高强混凝土柱节点抗震性能试验研究
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摘要
随着现代建筑的发展,建筑物的高度、跨度不断增加,传统的钢筋混凝土结构已经越来越不能胜任结构发展的需要。超高强混凝土结构的应用虽然能够提高构件的承载力,有效减小构件的截面尺寸,建造高层或超高层建筑,但超高强混凝土的延性较差、脆性较大,这在结构中是不容忽视的缺点。型钢超高强混凝土结构是指在钢筋超高强混凝土结构内部埋置型钢的一种新型结构型式。在型钢超高强混凝土结构中,型钢和超高强混凝土相互作用,使各自强度得到提高,同时由于型钢的存在,能够改善超高强混凝土本身延性差而带来的不利于抗震的脆性特性。因此,这种结构有着巨大的发展潜力和广阔的发展空间。目前,国内外对型钢普通混凝土结构或构件的抗震性能进行了大量的研究工作,而对型钢超高强混凝土结构或构件的研究尚不多见。基于此,本文就型钢超高强混凝土柱/钢筋混凝土梁节点的抗震性能进行了研究。
通过低周期反复荷载作用下型钢超高强混凝土柱/钢筋混凝土梁节点的试验,研究其受力过程和破坏机理,对试验过程进行了详细的描述并对试验结果进行了初步的分析;得到了节点的滞回曲线和骨架曲线;研究节点的延性性能、耗能能力、强度退化、刚度退化;分析节点核心区型钢、箍筋及梁纵筋应变的变化情况。
通过对试验结果进行分析,讨论节点核心区水平剪力的计算方法,研究了型钢超高强混凝土柱/钢筋混凝土梁节点核心区的抗裂机理;建立了节点核心区的抗裂承载力计算公式,并通过试验验证了该理论公式的正确性。
With the development of the modern buildings and the increasing in height and span of the buildings, reinforced concrete (RC) structure has been incompetent for the change. Despite the characteristic of increasing bearing capacity of member, reducing of sectional dimension of super-high-strength concrete (SHSC) structure, it is not in disregard of disadvantage of SHSC that has the character of bad ductility and great friability. Steel reinforced super-high-strength concrete structure, which is the new type of structure, is formed by steel encased in SHSC structure. That steel and SHSC can interact each other is contributed to the improvement of strength of steel and SHSC respective in steel SHSC structure and the amelioration of the character of bad ductility and great friability of SHSC. Therefore, steel SHSC structure has great development potential and development space. Although a lot of researches on the seismic behavior of steel reinforced concrete (SRC) both at home and abroad have been made, studies on steel SHSC structure are not enough. Based on this, the study on seismic behavior of the steel SHSC column/RC beam joints is presented.
By the tests of steel SHSC column/RC beam joints under the cyclic reversed loading, the process of load bearing and failure mechanism are studied. A detailed description of the test process and a preliminary analysis are given. The seismic behavior of the steel SHSC column/RC beam joints is analyzed. At the same time, the ductility, the energy dissipation capacity, strength deterioration and stiffness deterioration are studied. The strains of steel, stirrup and reinforcement of the beams in the joint core are analyzed.
The theoretic analysis of the steel SHSC column/RC beam joint is presented, and the shear calculating method of the steel SHSC column/RC beam joint core is discussed. According to the experimental data, the mechanism of crack resistance of the joint is studied. After that, a calculating formula of crack resistance of the joint is derived. The results indicate that the calculations agree well with those obtained on test.
通过低周期反复荷载作用下型钢超高强混凝土柱/钢筋混凝土梁节点的试验,研究其受力过程和破坏机理,对试验过程进行了详细的描述并对试验结果进行了初步的分析;得到了节点的滞回曲线和骨架曲线;研究节点的延性性能、耗能能力、强度退化、刚度退化;分析节点核心区型钢、箍筋及梁纵筋应变的变化情况。
通过对试验结果进行分析,讨论节点核心区水平剪力的计算方法,研究了型钢超高强混凝土柱/钢筋混凝土梁节点核心区的抗裂机理;建立了节点核心区的抗裂承载力计算公式,并通过试验验证了该理论公式的正确性。
With the development of the modern buildings and the increasing in height and span of the buildings, reinforced concrete (RC) structure has been incompetent for the change. Despite the characteristic of increasing bearing capacity of member, reducing of sectional dimension of super-high-strength concrete (SHSC) structure, it is not in disregard of disadvantage of SHSC that has the character of bad ductility and great friability. Steel reinforced super-high-strength concrete structure, which is the new type of structure, is formed by steel encased in SHSC structure. That steel and SHSC can interact each other is contributed to the improvement of strength of steel and SHSC respective in steel SHSC structure and the amelioration of the character of bad ductility and great friability of SHSC. Therefore, steel SHSC structure has great development potential and development space. Although a lot of researches on the seismic behavior of steel reinforced concrete (SRC) both at home and abroad have been made, studies on steel SHSC structure are not enough. Based on this, the study on seismic behavior of the steel SHSC column/RC beam joints is presented.
By the tests of steel SHSC column/RC beam joints under the cyclic reversed loading, the process of load bearing and failure mechanism are studied. A detailed description of the test process and a preliminary analysis are given. The seismic behavior of the steel SHSC column/RC beam joints is analyzed. At the same time, the ductility, the energy dissipation capacity, strength deterioration and stiffness deterioration are studied. The strains of steel, stirrup and reinforcement of the beams in the joint core are analyzed.
The theoretic analysis of the steel SHSC column/RC beam joint is presented, and the shear calculating method of the steel SHSC column/RC beam joint core is discussed. According to the experimental data, the mechanism of crack resistance of the joint is studied. After that, a calculating formula of crack resistance of the joint is derived. The results indicate that the calculations agree well with those obtained on test.
引文
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[8]薛建阳,赵鸿铁,杨勇.型钢混凝土节点抗震性能及构造方法.世界地震工程,2002,18(2):61-64.
[9]叶列平,方鄂华.钢骨混凝土构件的受力性能研究综述.土木工程学报,2000,33(5):1-12.
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[12]Yau C Y,Chan S L.Inelastic and stability analysis of flexibly connected steel frames.Journal of Structural Engineering,1994,120(10):2803-2819.
[13]Mareyasu D.An experimental study on load-deformation propery of steel framed reinforced concrete beam-column members yield in bending[A].Summaries of technical papers of Annual Meeting[C],Architectural Institute of Japan,1991:1590-1593.
[14]Nagashima T.A study on flexure behavior of steel reinforced concrete columns[A].Summaries of technical papers of Annual Meeting[C],Architectural Institute of Japan,1991:1961-1964.
[15]Katsuno J.Shear strength and behavior of composite columns with high strength concrete[A].Summaries of technical papers of Annual Meeting[C],Architectural Institute of Japan,1991:1711-1719.
[16]Komada K.Elasto-plastic behavior of composite members under biaxial bending[A].Summaries of Technical Papers of Annual Meeting[C],Architectural Institute of Japan,1991:1709-1710.
[17]Nishimura Shigeru.Flexural behavior of composite columns with eccentricity of H-shape steel[A].Summaries of Technical Papers of Annual Meeting[C],Architectural Institute of Japan,1991:1697-1700.
[18]Nakamura Takeshi.Experimental study on restoring force characteristics and dynamic response of composite steel reinforced concrete[J].Summaries of Technical Papers of Annual Meeting[C],Architectural Institute of Japan,1978:1367-1368.
[19]Sakai J,Matsui C.Hysteresis characteristics of steel reinforced concrete beam-columns[J].Journal of Structural Engineering,2000,120(10):183-190.
[20 Luigino Dezi,Graziano Leoni.Algebraic methods for creep analysis of continuous composite beams[J].Journal of Structural Engineering,1996,122(4):423-429.
[21]赵世春,陈家夔.劲性钢筋混凝土短柱受剪承载力试验.西南交通大学学报,1994,29(4):342-347.
[22]赵世春,陈家夔.劲性钢筋混凝土框架短柱受剪承载力计算.建筑结构,1994,15(30):66-74.
[23]叶列平,方鄂华.钢骨混凝土构件的受力性能研究综述.土木工程学报,2000,10(5):1-12.
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