角钢螺旋筋复合约束混凝土组合柱轴压性能及承载力计算
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摘要
为研究角钢螺旋筋复合约束混凝土组合柱的轴压力学性能,对26个该类组合柱试件及3个角钢约束混凝土柱对比试件进行了单调静力轴心受压试验。观察试件的破坏形态,得到试件的承载力和荷载-变形曲线。通过试件受力全过程的破坏形态、损伤演化、荷载-变形曲线、截面约束应力分布等分析角钢螺旋筋复合约束混凝土组合柱的复合约束机理和失效性态。基于Mander本构模型,通过划分不同的混凝土约束区,提出该类组合柱的轴压承载力计算方法。研究结果表明:角钢螺旋筋复合约束混凝土组合柱的轴压破坏过程及形态与角钢约束混凝土柱相似,但是其裂缝发展、混凝土剥落的过程更为缓慢;荷载-变形曲线更为饱满,损伤发展也更慢;承载力、延性和耗能能力都有显著提高;所提出轴压承载力计算方法的计算结果与试验结果吻合较好。
To investigate the axial compressive performance of concrete column confined with steel angle and circular spiral, 26 specimens of steel angle and circular spiral confined concrete(ACCC) columns and 3 control specimens of steel angle reinforced concrete(ARC) columns were tested under monotonous and static axial compressive loading. The failure modes of specimens were observed, and the load-bearing capacity and load-deformation curves were obtained. The combined constraint mechanism and the failure behavior of ACCC columns were investigated by analyzing the failure mode, damage evolution, load-deformation curve and sectional restraint stress distribution of specimens in the whole loading process. Based on the constitutive model of concrete proposed by Mander, a calculation method of axial compressive load-bearing capacity of ACCC column was proposed by partitioning different confined areas of concrete. Results show that the failure mode of ACCC column specimens is similar to that of ARC specimens under axial compression. However, crack propagation and concrete spalling for ACCC column are generally slower; the load-deformation curve is more plump, and the damage process is also slower; the load-bearing capacity, ductility and energy dissipation capacity of ACCC column were enhanced significantly. Calculation results from the load-bearing capacity formulaproposed for the column under axial compression agree well with the test results.
To investigate the axial compressive performance of concrete column confined with steel angle and circular spiral, 26 specimens of steel angle and circular spiral confined concrete(ACCC) columns and 3 control specimens of steel angle reinforced concrete(ARC) columns were tested under monotonous and static axial compressive loading. The failure modes of specimens were observed, and the load-bearing capacity and load-deformation curves were obtained. The combined constraint mechanism and the failure behavior of ACCC columns were investigated by analyzing the failure mode, damage evolution, load-deformation curve and sectional restraint stress distribution of specimens in the whole loading process. Based on the constitutive model of concrete proposed by Mander, a calculation method of axial compressive load-bearing capacity of ACCC column was proposed by partitioning different confined areas of concrete. Results show that the failure mode of ACCC column specimens is similar to that of ARC specimens under axial compression. However, crack propagation and concrete spalling for ACCC column are generally slower; the load-deformation curve is more plump, and the damage process is also slower; the load-bearing capacity, ductility and energy dissipation capacity of ACCC column were enhanced significantly. Calculation results from the load-bearing capacity formulaproposed for the column under axial compression agree well with the test results.
引文
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[18]蔡四维,蔡敏.混凝土的损伤断裂[M].北京:人民交通出版社,2003:100-102
[2]杨正义.外包钢混凝土组合结构施工探讨[J].电力建设,1993,14(9):46-49
[3]李明顺,张会存,张圣贤,等.外包钢混凝土框架内节点的抗震性能[J].工业建筑,1988(10):4-10
[4]姜绍飞,刘之洋.人工神经网络在外包钢混凝土框架柱设计参数预报中的适应性[J].土木工程学报,1997,30(1):73-77(Jiang Shaofei,Liu Zhiyang.Application of artificial neural network to the design parameters prediction for steel-encased concrete frame columns and its adaptability[J].China Civil Engineering Journal,1997,30(1):73-77(in Chinese))
[5]李殿平,刘颖.单向偏心压弯外包型钢混凝土柱的有限元分析[J].钢结构,2012,27(12):21-24(Li Dianping,Liu Ying.Finite element analysis of steel encased concrete column under unilateral eccentric compression load[J].Steel Construction,2012,27(12):21-24(in Chinese))
[6]张文福,计静,鲁华伟,等.角钢约束混凝土轴压短柱力学性能研究[J].建筑结构学报,2012,33(4):121-127(Zhang Wenfu,Ji Jing,Lu Huawei,et al.Behavior of angle reinforced concrete stub column under axial compression[J].Journal of Building Structures,2012,33(4):121-127(in Chinese))
[7]张惠林.外包钢混凝土结构的电厂主厂房设计[J].工业建筑,1990(5):11-15
[8]Kim C S,Park H G,Chung K S,et al.Eccentric axial load capacity of high-strength steel-concrete composite columns of various sectional shapes[J].Journal of Structural Engineering,2013,140(4):04013091
[9]Eom T S,Hwang H J,Park H G,et al.Flexural test for steel-concrete composite members using prefabricated steel angles[J].Journal of Structural Engineering,2013,140(4):04013094
[10]Kim H G,Kim M H,Cho N G,et al.Experimental study on the compressive strength of yLRC composite columns[J].Journal of Korean Society of Steel Construction,2009,21(5):545-552
[11]Hwang H J,Eom T S,Park H G,et al.Axial load and cyclic lateral load tests for composite columns with steel angles[J].Journal of Structural Engineering,2016,142(5):04016001
[12]Campione G.Strength and ductility of RC columns strengthened with steel angles and battens[J].Construction and Building Materials,2012,35(10):800-807
[13]Campione G.RC columns strengthened with steel angles and battens:experimental results and design procedure[J].Practice Periodical on Structural Design and Construction,2011,18(1):1-11
[14]Hwang H J,Eom T S,Park H G,et al.Cyclic loading test for beam-column connections of concrete-filled U-shaped steel beams and concrete-encased steel angle columns[J].Journal of Structural Engineering,2015,141(11):04015020
[15]Sheikh S A,Uzumeri S M.Strength and ductility of tied concrete columns[J].Journal of the Structural Division,ASCE,1980:106
[16]Montuori R,Piluso V.Reinforced concrete columns strengthened with angles and battens subjected to eccentric load[J].Engineering Structures,2009,31(2):539-550
[17]Mander J B,Priestley M J N,Park R.Theoretical stress-strain model for confined concrete[J].Journal of Structural Engineering,1988,114(8):1804-1826
[18]蔡四维,蔡敏.混凝土的损伤断裂[M].北京:人民交通出版社,2003:100-102