甘肃典型夯土民房承重墙体加固试验研究
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摘要
武都是甘肃省典型夯土民房使用地区,研究其夯土民房的抗震性能对于防灾减灾具有重要意义。在试验中,使用武都当地常用土料,完全按照其施工工艺夯筑4片夯土墙体试件,利用伪静力方法研究了素土墙体与使用铁丝网加固墙体的抗剪强度。结果显示:①在竖向荷载10 kN条件下,加固墙体试件较素土墙体试件的水平开裂荷载和极限荷载分别增长了73%和38%,在竖向荷载18 kN条件下,加固墙体试件素土墙体试件的水平开裂荷载和极限荷载分别增长了76%和5%;②随着竖向荷载从10 kN增加到18 kN,素土墙体试件的水平开裂荷载与极限荷载分别增长了217%和359%,加固墙体试件的水平开裂荷载与极限荷载则增长了223%和249%;③在水平往复荷载的作用下,夯土墙体始终沿着夯土层间的水平和垂直接触裂缝产生破坏,最终碎裂成块体。
Research on seismic performance of typical rammed earth houses is important for disaster prevention and mitigation in Wudu,Gansu province.Four experimental walls are built using local material and local construction technology.The shearing strength of raw soil wall and the wall reinforced by iron mesh are investegated by pseudo-static test,the results show,(1) the horizontal crack load and ultimate load of reinforced walls increases by 73% and 38% than those of raw soil walls under the overlying load of 10kN,and those are 76% and 5% under the overlying load 18kN;(2) the crack load and ultimate load of raw soil wall increases by 217% and 359% with the overlying load increases from 10kN to 18kN,while the growth rates are 223% and 249% separately for reinforced wall;(3) the rammed earth wall always destroys along the horizontal and vertical cracks between layers,and eventually breaks into blocks under ho-rizontal cyclic loading.
Research on seismic performance of typical rammed earth houses is important for disaster prevention and mitigation in Wudu,Gansu province.Four experimental walls are built using local material and local construction technology.The shearing strength of raw soil wall and the wall reinforced by iron mesh are investegated by pseudo-static test,the results show,(1) the horizontal crack load and ultimate load of reinforced walls increases by 73% and 38% than those of raw soil walls under the overlying load of 10kN,and those are 76% and 5% under the overlying load 18kN;(2) the crack load and ultimate load of raw soil wall increases by 217% and 359% with the overlying load increases from 10kN to 18kN,while the growth rates are 223% and 249% separately for reinforced wall;(3) the rammed earth wall always destroys along the horizontal and vertical cracks between layers,and eventually breaks into blocks under ho-rizontal cyclic loading.
引文
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[9]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.Li D R,Li H N,Chen B W.Experimental study onseismic performance of rural bearing walls bungalowin Gansu countryside[J].Earthquake ResistantEngineering,1987,(3):14-19.
[2]GB 18306-2001,中国地震动参数区划图[S].
[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.Ren X D.Thinking rural buildings against earthquakethrough the“5.12”Wenchuan earthquake[J].Sichuan Architecture,2008,28(4):6-7.
[4]石玉成,林学文.黄土地区生土建筑震害特征及防灾对策研究[J].自然灾害学报,2003,12(3):87-92.Shi Y C,Lin X W.Earthquake damage characteristicsof raw soil buildings in loess areas and disasterprevention countermeasures[J].Journal of NaturalDi-sasters,2003,12(3):87-92.
[5]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.Shi Y C,Wang L M,Lin X W.Prediction onearthquake damage of raw soil buildings in loess area[J].Northwestern Seismological Journal,2004,26(3):206-211.
[6]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.Wang J.Study on seismic resistance performance ofwall material used in rural raw soil buildings in loessarea[J].Northwestern Seismological Journal,2005,27(2):158-162.
[7]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(自然科学版),2007,39(4):451-456.Wang Y H,Su D J,Liu B Q,et al.Study on theseismic behavior of raw-soil structure with rammedearth wall[J].Jorunal of Xi’an University ofArchitecture and Techniques(Natural ScienceEdition),2007,39(4):451-456.
[8]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.Tan G P.Basic mechanics characteristics of rammedearth wall of rural houses in Yunnan Province[D].Kunming:Kunming University of Science andTechnology,2007.
[9]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.Li D R,Li H N,Chen B W.Experimental study onseismic performance of rural bearing walls bungalowin Gansu countryside[J].Earthquake ResistantEngineering,1987,(3):14-19.
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