装配式秸秆砌块填充墙框架结构振动台对比试验研究
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摘要
针对地震中普通砖砌体填充墙框架结构普遍出现的问题,提出一种装配式秸秆砌块填充墙框架结构体系。通过一个1∶3的普通砖砌体框架结构模型和一个1∶3的装配式秸秆砌块填充墙框架结构模型的地震振动台对比试验,研究了新结构体系在不同烈度地震作用下的动力响应及宏观破坏模式。可以发现,两个框架模型一阶频率的衰减规律基本一致,但破坏模式不同,装配式秸秆砌块填充墙框架结构模型梁端出现塑性铰而柱端完好,属于"强柱弱梁"破坏;同时,试验过程中装配式秸秆砌块填充墙框架结构模型的最大层间位移分布于1层与3层,没有形成底层薄弱层。试验结果表明,新结构体系传力途径清晰,结构刚度分布均匀,满足"小震不坏、中震可修、大震不倒"的抗震设防要求。
A structural system named fabricated straw brick infilled frame structure system was proposed to solve common problems of frame structure with ordinary brick masonry infilled wall under earthquakes. A 1∶3 scaled common brick masonry frame structure model and a 1∶3 scaled fabricated straw brick infilled wall frame structure model were tested by shaking table tests to compare. The dynamic responses and macroscopic failure modes of the new structural system under different seismic intensities were studied. It can be found that the attenuation law of the first-order frequencies of the two frame models is basically the same, but the failure modes are different. The plastic hinges appear at the end of the beams and the ends of the columns are intact in fabricated straw brick infilled wall frame structure model, which belongs to the destruction of "strong column and weak beam". Meanwhile, the maximum inter-story displacement of the fabricated straw brick infilled wall structure model is distributed in the first and third stories, and weak bottom story is not formed. The test results show that the new structural system has clear transmission way and uniform stiffness distribution, which meets the seismic fortification requirements of "no damage under small earthquakes, repairable in fortification earthquakes and no collapse under rare earthquakes".
A structural system named fabricated straw brick infilled frame structure system was proposed to solve common problems of frame structure with ordinary brick masonry infilled wall under earthquakes. A 1∶3 scaled common brick masonry frame structure model and a 1∶3 scaled fabricated straw brick infilled wall frame structure model were tested by shaking table tests to compare. The dynamic responses and macroscopic failure modes of the new structural system under different seismic intensities were studied. It can be found that the attenuation law of the first-order frequencies of the two frame models is basically the same, but the failure modes are different. The plastic hinges appear at the end of the beams and the ends of the columns are intact in fabricated straw brick infilled wall frame structure model, which belongs to the destruction of "strong column and weak beam". Meanwhile, the maximum inter-story displacement of the fabricated straw brick infilled wall structure model is distributed in the first and third stories, and weak bottom story is not formed. The test results show that the new structural system has clear transmission way and uniform stiffness distribution, which meets the seismic fortification requirements of "no damage under small earthquakes, repairable in fortification earthquakes and no collapse under rare earthquakes".
引文
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[2] 叶列平,马千里,缪志伟.钢筋混凝土框架结构强柱弱梁设计方法的研究[J].工程力学,2010,27(12):102-113.
[3] 中国建筑科学研究院.2008年汶川地震建筑震害图片集[M].北京:中国建筑工业出版社,2008.
[4] 娄宇,叶正强,胡孔国,等.四川汶川5.12地震房屋震害分析及抗震对策建议[J].建筑结构,2008,38(8):1-7.
[5] 周定国,张洋.我国农作物秸秆材料产业的形成与发展[J].木材工业,2007,21(1):6-8.
[6] 蒋成宠,杨仁杰,魏金娜,等.秸秆饰面墙体砌砖成型机的设计及其应用分析[J].建筑节能,2015,43(3):56-64.
[7] 黄红英,武国峰,孙恩惠,等.秸秆块墙体日光温室在苏北地区应用效果试验[J].农业工程学报,2014,30(14):52-54.
[8] 孙园淞,曹宝珠,王芳,等.水稻秸秆草砖的力学性能试验研究[J].建筑结构,2017,47(7):75-79.
[9] WILHELMSSON L,ARLINGER J,SPANGBERG K,et al.Models for predicting wood properties in stems of picea abies and pinus sylvestris in sweden[J].Scandinavian Journal of Forest Research,2002,17(4):330-350.
[10] LEI Y C,ZHANG S Y,ZEHUIi J.Models for predicting lumber bending MOR and MOE based on tree and stand characteristics in black spruce[J].Wood Science and Technology,2005,39(1):37-47.
[11] 赵龙龙,黄东升,王骁睿,等.秸秆轻质隔墙复合条板工程应用的试验研究[J].森林工程,2016,32(5):97-100.
[12] 周晓洁,李忠献,续丹丹,等.柔性连接填充墙框架结构抗震性能试验[J].天津大学学报(自然科学与工程技术版),2015,48(2):155-166.
[13] 张晋,吕志涛.短肢剪力墙筒体结构模型振动台试验研究[J].东南大学学报(自然科学版),2001,31(6):4-9.
[14] 霍瑞丽,刘伟庆,臧亚明.钢筋混凝土异形柱框架-抗震墙结构振动台试验[J].南京工业大学学报(自然科学版),2007,29(6):17-22.
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