大跨度装配整体式钢-混凝土组合空腹楼板受力性能试验研究
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摘要
长沙市某多层大跨度工业厂房采用装配整体式钢-混凝土组合空腹楼盖结构,为评价该结构体系的安全状况,采用缩尺模型试验和有限元分析相结合的方法对30 m×30 m楼盖结构进行了动力特性和力学性能研究。结果表明:组合空腹楼盖下层钢肋处于拉-弯、上层混凝土肋板处于压-弯的受力状态,从支座到跨中,其轴力逐渐增大而弯矩逐渐减小,应力分布比较均匀;剪力键主要承受弯矩和剪力,从支座到跨中,其弯矩和剪力逐渐减小。在竖向荷载作用下,楼板以弯曲变形为主,试验最大挠度为16.63 mm,为跨度的1/361。结构前8阶振型均为竖向振动,振动规律类似于实体平板,基本频率的理论计算值与实测值分别为3.3 Hz和3.0 Hz。对比试验数据与有限元分析结果二者吻合较好,验证了理论分析与原型结构设计的正确性。
In Changsha city, a long-span assembled monolithic steel-concrete composite open-web plate was established in multi-story industrial building. In order to effectively evaluate the structural safety condition,the structural dynamic characteristics and load-carrying behavior were studied through scaled model test and finite element analysis when the structural span is 30 m. Experimental results show that the lower steel rib of composite open-web plate is in flexural tension and upper concrete rib-plate is in flexural compression. The moment decreases and axial force increases from support to mid-span,and stress distribution is relatively uniform. The shear keys bear moment and shear,and decrease from support to mid-span. Under the vertical loads,the test specimen is in bending,and maximum deflection is 16. 63 mm and is 1 /361 of span. The first eight natural vibration modes of the structure are vertical modes and the vibration law is similar to that of solid plate. The basic frequency of the theoretical value is3. 3 Hz and measured value is 3. 0 Hz. Experimental data match well with calculated results though comparative analysis,demonstrating that both theoretical analysis and original structure design are reasonable.
In Changsha city, a long-span assembled monolithic steel-concrete composite open-web plate was established in multi-story industrial building. In order to effectively evaluate the structural safety condition,the structural dynamic characteristics and load-carrying behavior were studied through scaled model test and finite element analysis when the structural span is 30 m. Experimental results show that the lower steel rib of composite open-web plate is in flexural tension and upper concrete rib-plate is in flexural compression. The moment decreases and axial force increases from support to mid-span,and stress distribution is relatively uniform. The shear keys bear moment and shear,and decrease from support to mid-span. Under the vertical loads,the test specimen is in bending,and maximum deflection is 16. 63 mm and is 1 /361 of span. The first eight natural vibration modes of the structure are vertical modes and the vibration law is similar to that of solid plate. The basic frequency of the theoretical value is3. 3 Hz and measured value is 3. 0 Hz. Experimental data match well with calculated results though comparative analysis,demonstrating that both theoretical analysis and original structure design are reasonable.
引文
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[3]黄勇,刘静,周理,白晓东.组合空腹板架结构研究与应用[J].建筑结构学报,2007,28(增刊1):195-201.(HUANG Yong,LIU Jing,ZHOU Li,BAI Xiaodong.Researches and application of composite open-web plat[J].Journal of Building Structures,2007,28(Suppl.1):195-201.(in Chinese))
[4]黄勇,陈伟刚,白小冬.钢-混凝土组合空腹板架结构地震响应研究[J].建筑结构学报,2009,30(增刊2):149-153.(HUANG Yong,CHEN Weigang,BAI Xiaodong.Seismic response study of steel-concrete composite open-web plate frame[J].Journal of Building Structures,2009,30(Suppl.2):149-153.(in Chinese))
[5]胡岚,马克俭.U形钢板-混凝土高强螺栓连接组合空腹夹层板楼盖结构研究与应用[J].建筑结构学报,2012,33(7):61-69.(HU Lan,MA Kejian.Research and application of U-shaped steel plateconcrete composite open-web sandwich slab structure with high strength bolts[J].Journal of Building Structures,2012,33(7):61-69.(in Chinese))
[6]胡岚,马克俭,易伟建,等.U形钢板-混凝土高强螺栓连接组合空腹夹层板楼盖舒适度实测与研究[J].建筑结构学报,2012,33(7):70-75.(HU Lan,MA Kejian,YI Weijian,et al.Test and research of comfortable degree of structure of high strength bolts connected U-shaped steel plate-concrete composite open-web sandwich floor[J].Journal of Building Structures,2012,33(7):70-75.(in Chinese))
[7]GB 50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.(GB 50010—2010Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2010.(in Chinese))
[8]易伟建,张望喜.建筑结构试验[M].北京:中国建筑工业出版社,2005:179-204.(YI Weijian,ZHANG Wangxi.Structural experiment[M].Beijing:China Architecture&Building Press,2005:179-204.(in Chinese))
[9]GB 50017—2003钢结构设计规范[S].北京:中国建筑工业出版社,2004.(GB 50017—2003 Code for design of steel structures[S].Beijing:China Architecture&Building Press,2004.(in Chinese))
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