圆钢管混凝土柱低周反复加载试验研究
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摘要
为了研究钢管混凝土柱在低周反复荷载作用下组合材料横截面刚度对其性能的影响,以果园港二期工程上的钢管混凝土柱为原型,对3根钢管混凝土柱进行低周反复加载试验。通过控制试件钢管厚度进行物理模型试验,研究钢管厚度对钢管混凝土柱耗能性能、承载性能、强度退化、刚度退化、延性和变形能力的影响。试验结果表明:随着试件钢管厚度的增加,试件的能量耗散系数与等效黏滞阻尼系数均随之减小,试件的耗能能力随之变弱;钢管厚度越小,钢管混凝土柱试件的耗能性能越好。钢管越厚,对核心混凝土的约束作用就越强,强度退化就越弱,试件塑性变形能力就越好。钢管越厚,外包钢管对核心混凝土约束作用就越强,水平承载能力越高。
In order to study the effect of cross-section stiffness of composite materials on the performance of concrete filled steel tubular columns under low cycle cyclic loading,three concrete filled steel tubular columns were tested under low cycle cyclic loading using concrete filled steel tubular columns in the second phase of Guoyuan Port Project as prototype.Physical model tests were carried out to study the effects of steel tube thickness on energy dissipation, bearing capacity, strength degradation, stiffness degradation, ductility and deformation capacity of concrete filled steel tubular columns. The experimental results show that the energy dissipation coefficient and the equivalent viscous damping coefficient of the specimens decrease with the increase of the thickness of the steel tube,and the energy dissipation capacity of the specimens decreases.The smaller the thickness of the steel tube is,the better the energy dissipation performance of the concrete filled steel tubular column specimens.The thicker the steel tube is,the stronger the restraint effect on core concrete,the weaker the strength degradation and the better the plastic deformation ability of the specimens.The thicker the steel pipe,the stronger the restraint effect of the outer steel pipe on the core concrete and the higher the horizontal bearing capacity.
In order to study the effect of cross-section stiffness of composite materials on the performance of concrete filled steel tubular columns under low cycle cyclic loading,three concrete filled steel tubular columns were tested under low cycle cyclic loading using concrete filled steel tubular columns in the second phase of Guoyuan Port Project as prototype.Physical model tests were carried out to study the effects of steel tube thickness on energy dissipation, bearing capacity, strength degradation, stiffness degradation, ductility and deformation capacity of concrete filled steel tubular columns. The experimental results show that the energy dissipation coefficient and the equivalent viscous damping coefficient of the specimens decrease with the increase of the thickness of the steel tube,and the energy dissipation capacity of the specimens decreases.The smaller the thickness of the steel tube is,the better the energy dissipation performance of the concrete filled steel tubular column specimens.The thicker the steel tube is,the stronger the restraint effect on core concrete,the weaker the strength degradation and the better the plastic deformation ability of the specimens.The thicker the steel pipe,the stronger the restraint effect of the outer steel pipe on the core concrete and the higher the horizontal bearing capacity.
引文
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[7]车媛,王庆利,邵永波,等.圆CFRP-钢管混凝土压弯构件滞回性能试验研究[J].土木工程学报,2011,44(7):46-54.
[8] ZHANG Y, XU C, LU X. Experimental study of hysteretic behaviour for concrete-filled square thin-walled steel tubular columns[J].Journal of constructional steel research,2007,63(3):317-325.
[9] ALVAG M S. Application of lumped dissipation model in nonlinear analysis of reinforced concrete structures[J].Engineering structures,2010,32(4):974-981.
[10]韩林海,陶忠,阎维波.圆钢管混凝土压弯构件荷载-位移滞回性能分析[J].地震工程与工程振动,2001(1):64-73.
[2]钟善桐.钢管混凝土结构[M].北京:清华大学出版社有限公司,2003.
[3] SAKINO K,NAKAHARA H,MORINO S,et al.Behavior of centrally loaded concrete-filled steel-tube short columns[J].Journal of structural engineering,2004,130(2):180-188.
[4] BRIDGE R Q, PHAM L, ROTTER J M. Composite steel and concrete columns-design and reliability[C]//Australia:Australasian Conference on the Mechanics of Structures&Materials,1986.
[5] BRADFORD M A. Design strength of slender concrete filled rectangular steel tubes[J]. ACI structural journal,1996,93(2):243-252.
[6] CEDERWALL K, ENGSTROM B, GRAUERS M. Highstrength concrete used in composite columns[J]. ACI special publication,sp 121-11:195-210.
[7]车媛,王庆利,邵永波,等.圆CFRP-钢管混凝土压弯构件滞回性能试验研究[J].土木工程学报,2011,44(7):46-54.
[8] ZHANG Y, XU C, LU X. Experimental study of hysteretic behaviour for concrete-filled square thin-walled steel tubular columns[J].Journal of constructional steel research,2007,63(3):317-325.
[9] ALVAG M S. Application of lumped dissipation model in nonlinear analysis of reinforced concrete structures[J].Engineering structures,2010,32(4):974-981.
[10]韩林海,陶忠,阎维波.圆钢管混凝土压弯构件荷载-位移滞回性能分析[J].地震工程与工程振动,2001(1):64-73.