甘肃武都典型夯土民房承重墙体抗剪强度试验研究
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摘要
武都是甘肃省典型夯土民房使用地区。试验中使用武都当地常用土料,完全按照当地施工工艺夯筑两片夯土墙体试件,利用伪静力方法研究墙体抗剪强度。结果显示:(1)上覆荷载对夯土墙体的水平承载力和变形影响较大,随着上覆荷载从10kN增加到18kN,开裂荷载和极限荷载分别增加了217%和359%,极限顶点位移则降低了30%;(2)在水平往复荷载的作用下,夯土墙体始终沿着夯土层间水平和垂直接触裂缝处产生破坏,最终碎裂成块体。最后提出了使用铁丝网来加固现存夯土民房承重墙体的建议。
Wudu is the area where using typical rammed earth rural houses in Gansu province.In experiments two wall specimens are built using local material and local construction technology,and the shearing strength of wall is investegated by pseudo-static test,the results show(1) the overlying load on the wall has greater effect on horizontal load capacity and deformation of the wall,with the overlying load from 10 kN to 18 kN,cracking load and ultimate load increased by 217% and 359%,ultimate top displacement is reduced by 30%;(2) the rammed earth wall is always destroyed along the horizontal and vertical contacts between layers,and eventually is fragmented into blocks with the role of horizontal cyclic loading.At last,this paper recommend to reinforce the rammed earth bearing wall of the existing rural houses with iron mesh.
Wudu is the area where using typical rammed earth rural houses in Gansu province.In experiments two wall specimens are built using local material and local construction technology,and the shearing strength of wall is investegated by pseudo-static test,the results show(1) the overlying load on the wall has greater effect on horizontal load capacity and deformation of the wall,with the overlying load from 10 kN to 18 kN,cracking load and ultimate load increased by 217% and 359%,ultimate top displacement is reduced by 30%;(2) the rammed earth wall is always destroyed along the horizontal and vertical contacts between layers,and eventually is fragmented into blocks with the role of horizontal cyclic loading.At last,this paper recommend to reinforce the rammed earth bearing wall of the existing rural houses with iron mesh.
引文
[1]王兰民,林学文.农村民房抗震理论与技术[M].兰州:甘肃科学技术出版社,2006.
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[2]中国地震动参数区划图(GB18306-2001)[S].北京:中国标准出版社,2001.
[3]任祥道.透过“5.12”汶川地震思考农房抗震[J].四川建筑,2008,28(4):6-7.
[4]石玉成,王兰民,林学文.黄土生土建筑震害预测研究[J].西北地震学报,2004,26(3):206-211.
[5]王峻.黄土地区农村民房生土建筑土墙体材料抗震性能的试验研究[J].西北地震学报,2005,27(2):158-162.
[6]王毅红,苏东君,刘伯权,等.生土结构房屋的承重夯土墙体抗震性能试验研究[J].西安建筑科技大学学报,2007,39(4):451-456.
[7]谭冠平.云南农村民居典型土筑墙基本力学试验研究[D].昆明:昆明理工大学,2007.
[8]李德荣,黎海南,陈丙午.甘肃农村土墙承重平房抗震性能的试验研究[J].工程抗震,1987,(3):14-19.
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