恒压受弯无筋砌体承重墙的受弯能力历经过程特征研究
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摘要
为探索水平地震作用下恒压受弯无筋砌体承重墙的受弯力学性能,研究了正截面在不同阶段弹塑性受弯能力的历经过程。基于砌体正截面非均匀应力的本构关系假定及拉压区应力图形的等效化,对不同初裂情况下各阶段的恒压受弯能力计算公式作了理论推导,并进行了编程计算分析。结果表明:砌体墙在通常轴压比下,正截面边缘首先拉裂,之后受弯能力不会退化而是逐渐增大;达到极限受弯承载力后,截面产生压碎,受弯能力退化呈直线下降型;弯曲拉裂是从截面局部开始和发展的,受弯能力呈现类似配筋混凝土墙柱的延性,拉裂和压碎的开展过程随轴压比的增大而缩短。砌体墙在高轴压比下,正截面首先压碎,随后受弯能力持续下降。
The course route of elastic-plastic bending capacity during different phases is studied in order to investigate the mechanics properties of plain masonry bearing walls which carry bending moments and invariable axial forces under a horizontal earthquake action.The formulas for bending capacity at each stage of different circumstances of initial cracking or crushing are theoretically deduced on the basis of a constitutive relationship assumption under uneven stress and stress figure equalization on a normal section.Furthermore,programming and numerical simulating are carried out.The researches indicate that normal section cracks firstly under a usual value of axial compressive stress to strength and bending capacity will not degenerate later but increase gradually,and normal section crushes and bending capacity degenerates linearly after ultimate bending capacity is reached;bending cracking begins at local edges and gradually expands,meanwhile bending capacity exhibits some kind of ductility similar to that of a reinforced concrete wall or column;the course of tensile cracking or compressive crushing becomes shorter along with the increase of compression ratios.On the other hand,the results indicate that normal section crushes firstly under the higher value of compression ratios and course route curves of bending capacity show the trend of a continuous decline.
The course route of elastic-plastic bending capacity during different phases is studied in order to investigate the mechanics properties of plain masonry bearing walls which carry bending moments and invariable axial forces under a horizontal earthquake action.The formulas for bending capacity at each stage of different circumstances of initial cracking or crushing are theoretically deduced on the basis of a constitutive relationship assumption under uneven stress and stress figure equalization on a normal section.Furthermore,programming and numerical simulating are carried out.The researches indicate that normal section cracks firstly under a usual value of axial compressive stress to strength and bending capacity will not degenerate later but increase gradually,and normal section crushes and bending capacity degenerates linearly after ultimate bending capacity is reached;bending cracking begins at local edges and gradually expands,meanwhile bending capacity exhibits some kind of ductility similar to that of a reinforced concrete wall or column;the course of tensile cracking or compressive crushing becomes shorter along with the increase of compression ratios.On the other hand,the results indicate that normal section crushes firstly under the higher value of compression ratios and course route curves of bending capacity show the trend of a continuous decline.
引文
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[2]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,2008:205―220.China Academy of Building Research.Photo collectionof 2008 Wenchuan earthquake damage to buildings[M].Beijing:China Architecture&Building Press,2008:205―220.(in Chinese)
[3]张文芳,程文瀼,李爱群,税国斌.九层房屋滑移隔震的试验、分析及应用研究[J].建筑结构学报,2000,21(3):60―68.Zhang Wenfang,Cheng Wenrang,Li Aiqun,ShuiGuobin.Experiments,theoretical analyses and appliedresearch on base sliding isolation of multi-storeybuildings[J].Journal of Building Structures,2000,21(3):60―68.(in Chinese)
[4]郝彤,刘立新,王仁义.混凝土多孔砖墙体抗震性能试验研究[C]//杨伟军,高连玉,梁建国.砌体结构理论与新型墙材应用.北京:中国城市出版社,2007:240―244.Hao Tong,Liu Lixin,Wang Renyi.Experimentalresearches on seismic performance of concrete perforatedbrick masonry[C]//Yang Weijun,Gao Lianyu,LiangJianguo.Masonry Structure Theory and New Type WallMaterial Application.Beijing:China City Press,2007:240―244.(in Chinese)
[5]ACI 530-05/ASCE 5-05/TMS 402-05,Building coderequirements for masonry structures[S].Boulder:TheMasonry Standards Joint Committee,2005.
[6]张文芳,武玉龙,常建兰,等.免剪切破坏型抗震抗倒砌体房屋及其建造方法[P].中国:200810079314.X,2008-8-27.Zhang Wenfang,Wu Yulong,Chang Jianlan,et al.Seismic masonry structures escaping from shearbreakage and construction methods[P].China:200810079314.X,2008-8-27.(in Chinese)
[7]张文芳,莫振宝,常建兰.砌体房屋无洞独立墙段层间侧移刚度的转角影响研究[J].工程抗震与加固改造,2007,29(6):36―40.Zhang Wenfang,Mo Zhenbao,Chang Jianlan.Researchof influence of end rotation angle on equivalent lateralstiffness of wall segment of masonry structure[J].Earthquake Resistant Engineering and Retrofitting,2007,29(6):36―40.(in Chinese)
[8]孟钢,周晓夫,王菁,高小旺,孙嘉瑞.砖墙与钢筋砼墙组合结构弯曲对砖墙承载力影响[J].工程力学,1997,14(增刊Ⅱ):119―123.Meng Gang,Zhou Xiaofu,Wang Jing,Gao Xiaowang,Sun Jiarui.The influence on brick walls’bearingcapacity of composite structure bending made of brickand reinforced concrete[J].Engineering Mechanics,1997,14(SupplⅡ):119―123.(in Chinese)
[9]邬瑞峰,奚肖凤,蔡贤辉,等.弯曲对组合墙体抗侧力的影响[J].建筑结构,1997,27(2):14―18.Wu Ruifeng,Xi Xiaofeng,Cai Xianhui,et al.Theinfluence of bending on the lateral loading capacity ofcomposite masonry walls[J].Building Structure,1997,27(2):14―18.(in Chinese)
[10]蔡贤辉,邬瑞峰,奚肖凤,等.组合砌体剪力墙的抗弯承载能力[J].建筑结构,1999,29(3):3―6.Cai Xianhui,Wu Ruifeng,Xi Xiaofeng,et al.Bendingbearing capacity calculation of composite masonry shearwall[J].Building Structure,1999,29(3):3―6.(inChinese)
[11]张文芳,程文瀼,李爱群.地震倾覆力矩对多层砌体结构墙体的影响[J].建筑结构,1998,28(9):8―11.Zhang Wenfang,Cheng Wenrang,Li Aiqun.Influence ofoverturning moment on wall in multi-storey masonrystructure under earthquake[J].Building Structure,1998,28(9):8―11.(in Chinese)
[12]梁建国,张望喜,郑勇强.钢筋混凝土-砖砌体剪力墙抗震性能[J].建筑结构学报,2003,24(3):61―69.Liang Jianguo,Zhang Wangxi,Zheng Yongqiang.Seismic performance of composite walls made ofreinforced concrete and brick masonry[J].Journal ofBuilding Structures,2003,24(3):61―69.(in Chinese)
[13]杨伟军,施楚贤.砌体受压本构关系研究成果的述评[J].四川建筑科学研究,1999,25(3):52―55.Yang Weijun,Shi Chuxian.Comment on researchachievement of constitutive relationship of compressivebrickwork[J].Building Science Research of Sichuan,1999,25(3):52―55.(in Chinese)
[14]易伟建,李鹏.轴心受压砌体本构关系的试验研究[J].中国科技论文在线,2006,1(2):153―156.Yi Weijian,Li Peng.Experiments Study of MasonryConstitutive Relationship under Axial Compression[J].Science Paper Online,2006,1(2):153―156.(inChinese)
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