矩形孔烧结页岩砖砌体短柱偏心受压性能试验
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摘要
偏心受压是砖砌体工程中常见的受力形式,是反应构件在偏心受力状态下耗能能力的重要指标。采用2种强度等级的砂浆和4种偏心率砌筑8组短柱试件,研究构件中部截面的平均应变变化情况、试件破坏形态和偏心承载力。结果表明,矩形孔烧结页岩砖砌体短柱试件截面的平均应变能较好地符合平截面假设,偏心率的增大会削弱砌体短柱的偏心承载力,但破坏荷载试验值仍符合规范要求,并有较高的强度储备。对试验数据拟合回归所提出的偏心影响系数计算公式可为相关规程的修订和完善提供参考。
Eccentric compression is a common form of stress in brick masonry engineering and an important indicator of energy dissipation capacity of reaction components under eccentric stress. Two kinds of mortar strength and four kinds of eccentricity are used to construct eight groups of short column specimens. The average strain change of the middle section of the member,the failure morphology and the eccentric bearing capacity of the specimen were studied. The results show that the average strain energy of the cross section of the specimen conforms well to the assumption of flat section. The increase of eccentricity will weaken the eccentric bearing capacity of the short columns of masonry but the test values of failure load are still much higher than those of the normalized ones,strength reserves. The calculation formula of the eccentric influence coefficient proposed by the fitting regres-sion of the test data provides references for the revision and perfection of the relevant regulations.
Eccentric compression is a common form of stress in brick masonry engineering and an important indicator of energy dissipation capacity of reaction components under eccentric stress. Two kinds of mortar strength and four kinds of eccentricity are used to construct eight groups of short column specimens. The average strain change of the middle section of the member,the failure morphology and the eccentric bearing capacity of the specimen were studied. The results show that the average strain energy of the cross section of the specimen conforms well to the assumption of flat section. The increase of eccentricity will weaken the eccentric bearing capacity of the short columns of masonry but the test values of failure load are still much higher than those of the normalized ones,strength reserves. The calculation formula of the eccentric influence coefficient proposed by the fitting regres-sion of the test data provides references for the revision and perfection of the relevant regulations.
引文
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[2]秦士洪,曹桓铭,倪校军,等.蒸压粉煤灰砖砌体偏心受压性能试验[J].重庆大学学报,2009,32(7):815-822.
[3]Brencich A,Corradi C,Gambarotta L.Eccentrically loaded brickwork:Theoretical and experimental result[J].Engineering Structures,2008,30(12):3629-3643.
[4]Adam J M,Brencich A,Hughes T G,et al.Micromodelling of eccentrically loaded brickwork:Study of masonry wallettes[J].Engineering Structures,2010,32(5):1244-1251.
[5]Facconi L,Conforti A,Minelli F,et al.Improving shear strength of unreinforced masonry walls by nano-reinforced fibrous mortar coatin[J].Materials&Structures,2015,48(8):2557-2574.
[6]周涛,王少杰,刘福胜,等.混凝土夹心秸秆块砌块砌体偏心受压承载力试验研[J].建筑科学,2017,33(9):65-70.
[7]徐春一,刘明,王广林.蒸压粉煤灰多孔砖砌体偏心受压承载力试验研究[J].山东大学学报(工学版),2010,40(2):71-77.
[8]赖骏.矩形孔烧结页岩砖砌体基本力学性能研[D].柳州:广西科技大学,2015.
[9]杜云丹.页岩多孔砖砌体基本力学性能试验研[D].柳州:广西工学院,2012.
[10]钱义良.砌体结构构件的偏心受压[C]//中国工程建设标准化协会砌体结构委员会.砌体结构研究论文集:上海,1988.
[11]施楚贤.砖砌体偏心受压构件的承载力分析[C]//中国工程建设标准化协会砌体结构委员会.砌体结构研究论文集:上海,1988.