分布式连接全装配RC楼盖横板向弯曲刚度计算方法研究
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摘要
在分布式连接全装配RC楼盖(DCNPD)中,板与板之间和梁板之间通过连接件连接以提高楼盖的竖向承载力和平面内刚度。为研究DCNPD竖向承载力计算方法,在试验基础上进行了DCNPD横板向弯曲刚度理论与数值模拟分析。结果表明:DCNPD的竖向承载能力略小于现浇楼盖,远大于不加连接件的装配式楼盖,验证了DCNPD板缝构造横板向传力的有效性;建立了DCNPD横板向弯曲刚度简化分析模型,基于等效梁模型理论提出DCNPD横板向弯曲刚度计算方法,并验证了该方法用于楼盖竖向承载力弹性分析的可行性;楼盖的板缝数和连接件个数对其横板向与整体楼盖的竖向承载能力影响较大,而板缝数的影响更为显著,工程中在运输和吊装条件允许的情况下,宽板预制方案可有效提高楼盖的竖向承载能力。研究成果可为分布式连接全装配RC楼盖的研究应用提供参考和依据。
In order to enhance the vertical bearing capacity and in-plane stiffness of discrete connected new-type precast RC floor diaphragms(DCNPD), slab joints and slab-beam joints are connected by mechanical connectors.The theoretical and numerical studies of bending stiffness in the orthogonal slab laying direction(OSLD) were conducted to reveal the vertical bearing capacity of DCNPD based on experimental results. The result shows that:the vertical bearing capacity of DCNPD is slightly smaller than that of cast-in-situ floor, but much higher than that of the precast floor without slab joint connectors, demonstrating that the connectors are effective in transferring the OSLD force in DCNPD. An analytical model for bending stiffness in OSLD was constructed and the bending stiffness calculation method(which was verified valid in the elastic analysis of DCNPD) in OSLD of DCNPD was proposed based on equivalent beam-model theory. Both slab numbers and connector numbers are main factors for the vertical bearing capacity of DCNPD, but slab numbers are more vital compared with connector numbers. It is proposed that wide-precast-slab plan should be preferred when the transportation and hoisting conditions are available. The results can provide a reference for further studies and project practices of DCNPD.
In order to enhance the vertical bearing capacity and in-plane stiffness of discrete connected new-type precast RC floor diaphragms(DCNPD), slab joints and slab-beam joints are connected by mechanical connectors.The theoretical and numerical studies of bending stiffness in the orthogonal slab laying direction(OSLD) were conducted to reveal the vertical bearing capacity of DCNPD based on experimental results. The result shows that:the vertical bearing capacity of DCNPD is slightly smaller than that of cast-in-situ floor, but much higher than that of the precast floor without slab joint connectors, demonstrating that the connectors are effective in transferring the OSLD force in DCNPD. An analytical model for bending stiffness in OSLD was constructed and the bending stiffness calculation method(which was verified valid in the elastic analysis of DCNPD) in OSLD of DCNPD was proposed based on equivalent beam-model theory. Both slab numbers and connector numbers are main factors for the vertical bearing capacity of DCNPD, but slab numbers are more vital compared with connector numbers. It is proposed that wide-precast-slab plan should be preferred when the transportation and hoisting conditions are available. The results can provide a reference for further studies and project practices of DCNPD.
引文
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[2]Davies G,Elliott K S,Omar W.Horizontal diaphragm action in precast concrete floors[J].The Structural Engineer,1990,68(2):25―32.
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[14]周绪红,张微伟,吴方伯,等.预应力混凝土四边简支双向叠合板的设计方法[J].建筑科学与工程学报,2006,23(4):54―57.Zhou Xuhong,Zhang Weiwei,Wu Fangbo,et al.Design method of prest ressed concrete simply supported on four sides of tw-oway composite slab[J].Journal of Architecture and Civil Engineering,2006,23(4):54―57.(in Chinese)
[15]吴方伯,黄海林,陈伟,等.肋上开孔对预制预应力混凝土带肋薄板施工阶段挠度计算方法的影响研究[J].工程力学,2011,18(11):64―71.Wu Fangbo,Huang Hailin,Chen Wei,et al.Influence of preformed holes on flexural deflection calculation methods of precast prestressed concrete ribbed panels for composite slabs[J].Engineering Mechanics,2011,28(11):64―71.(in Chinese)
[16]周旺华.现代混凝土叠合结构[M].北京:中国建筑工业出版社,1998:154―196.Zhou Wanghua.Modern concret e composit e st ructures[M].Beijing:China Architecture&Building Press,1998:154―196.(in Chinese)
[17]吴方伯,刘彪,罗继丰.预应力混凝土叠合空心楼板的受剪性能试验研究[J].工程力学,2016,33(3):196―203.Wu Fangbo,Liu Biao,Luo Jifeng.Experimental study on shear resisting properties prestressed concrete composite hollow core slabs[J].Engineering Mechanics,2016,33(3):196―203.(in Chinese)
[18]崔士起,刘传卿,刘文政,等.分离式接缝叠合板垂直接缝方向抗弯刚度的试验及计算方法研究[J].建筑结构学报,2018,39(9):75―84.Cui Shiqi,Liu Chuanqing,et al.Research on experiment and calculating methods of flexural stiffness in direction perpendicular to separating-type joints for concrete composite slab[J].Journal of Building Structures,2018,39(9):75―84.(in Chinese)
[19]过镇海,王传志.多轴应力下混凝土的强度和破坏准则研究[J].土木工程学报,1991(3):1―14.Guo Zhenhai,Wang Chuanzhi.Study on strength and failure criterion of concrete under multi-axial stress[J].China Civil Engineering Journal,1991(3):1―14.(in Chinese)
[20]田春雨,聂建国.组合楼盖竖向承重体系中楼板变形及内力分析[J].工程力学,2006,23(5):62―66.Tian Chunyu,Nie Jianguo.Analysis of deflection and internal force in composite slab-on-girder floor system[J].Engineering Mechanics,2006,23(5):62―66.(in Chinese)
[21]庞瑞,许清风,梁书亭,等.分布式连接全装配RC楼盖竖向承载力与变形分析[J].工程力学,2019,36(4):147―157.Pang Rui,Xu Qingfeng,Liang Shuting,et al.Analysis of the vertical strength and deflection of discrete connected precast RC floor system[J].Engineering Mechanics,2019,36(4):147―157.(in Chinese)
[22]姚凌.建筑结构静力计算手册[M].北京:中国建筑工业出版社,2001:194―239.Yao Ling.Static calculation mual of building structures[M].Beijing:China Architectural&Building Press,2001:194―239.(in Chinese)
[23]杨耀乾.平板理论[M].北京:中国铁道出版社,1984:207―240.Yang Yaokun.Theory of tablet[M].Beijing:China Railway Publishing House,1984:207―240.(in Chinese)
[24]Reddy J N.Theory and analysis of elastic plates and shells[M].2nd ed.Boca Raton:CRC Press,2007:215―259.
[2]Davies G,Elliott K S,Omar W.Horizontal diaphragm action in precast concrete floors[J].The Structural Engineer,1990,68(2):25―32.
[3]Baran E.Effects of cast-in-place concrete topping on flexural response of precast concrete hollow-core slabs[J].Engineering Structures,2015,98(9):109―117.
[4]Hawkins N M,Ghosh S K.Proposed revisions to 1997NEHRP recommended provisions for seismic regulations for precast concrete structures:Part 3-Diaphragms[J].PCI Journal,2000,45(6):49―58.
[5]PCI industry handbook committee.pci design handbook:precast and prestressed concrete(8th edition)[S].Chicago:PCI,2017.
[6]祁成财,蒋勤俭.一汽停车楼装配式结构深化设计关键技术研究[R].厦门:第五届中国(国际)预制混凝土技术论坛,2015-6-25.Qi Chengcai,Jiang Qinjian.Key techniques on the YIQIparking building detailed design[R].Xamen:The Fifth China(internatoinal)Forum on Precast Concrete Technique,2016-6-25.(in Chinese)
[7]JGJ 1―2014,装配式混凝土结构技术标准[S].北京:中国建筑工业出版社,2014.JGJ 1―2014,Technical code for precast concrete building[S].Beijing:China Building Industry Press,2014.(in Chinese)
[8]庞瑞,陈桂香,倪红梅,等.全干式连接预制混凝土板?楼盖及其抗震性能提升方法[P].中国ZL 2015 10247926.5,2017-07-14.Pang Rui,Chen Guixiang,Ni Hongmei,et al.Untopped precast slab and floor diaphragm[P].China patent:ZL2015 1 0247926.5,2017.07.14.(in Chinese)
[9]庞瑞,许清风,梁书亭,等.全装配RC楼盖平面内受力性能试验研究[J].建筑结构学报,2012,33(10):67―74.Pang Rui,Xu Qingfeng,Liang Shuting,et al.In-plane mechanism of untopped precast RC floor diaphramgs[J].Journal of Building Structures,2012,33(10):67―74.(in Chinese)
[10]朱筱俊,庞瑞,梁书亭.全装配式钢筋混凝土楼盖竖向受力性能试验研究[J].建筑结构学报,2013,34(1):123―130.Zhu Xiaojun,Pang Rui,Liang Shuting.Vertical bearing capacity of untopped precast RC floor diaphramgs[J].Journal of Building Structures,2013,34(1):123―130.(in Chinese)
[11]庞瑞,梁书亭,朱筱俊,等.全装配式RC楼盖板缝节点拉剪复合受力性能试验研究[J].工程力学,2018,35(10):112―123.Pang Rui,Xu Qingfeng,Liang Shuting,et al.Experimental study on mechanical behavior of slab connections under combined shear and tension loading[J].Engineering Mechanics,2018,35(10):112―123.(in Chinese)
[12]庞瑞,梁书亭,朱筱俊.分布式连接全装配RC楼盖板缝节点平面内受力性能试验研究[J].建筑结构学报,2019,40(2):178―188.Pang Rui,Liang Shuting,Zhu Xiaojun,et al.Experimental study on in-plane mechanical behavior of slab connections of discrete connected precast RCdiaphragm[J].Journal of Building Structures,2019,40(2):178―188.(in Chinese)
[13]王晓锋.单向预应力双向叠合板楼盖试验研究[D].北京:中国建筑科学研究院,2003.Wang Xiaofeng.Experimental study of a prestressed two-way composite slab floor[D].Beijing:China Academy of Building Research,2003.(in Chinese)
[14]周绪红,张微伟,吴方伯,等.预应力混凝土四边简支双向叠合板的设计方法[J].建筑科学与工程学报,2006,23(4):54―57.Zhou Xuhong,Zhang Weiwei,Wu Fangbo,et al.Design method of prest ressed concrete simply supported on four sides of tw-oway composite slab[J].Journal of Architecture and Civil Engineering,2006,23(4):54―57.(in Chinese)
[15]吴方伯,黄海林,陈伟,等.肋上开孔对预制预应力混凝土带肋薄板施工阶段挠度计算方法的影响研究[J].工程力学,2011,18(11):64―71.Wu Fangbo,Huang Hailin,Chen Wei,et al.Influence of preformed holes on flexural deflection calculation methods of precast prestressed concrete ribbed panels for composite slabs[J].Engineering Mechanics,2011,28(11):64―71.(in Chinese)
[16]周旺华.现代混凝土叠合结构[M].北京:中国建筑工业出版社,1998:154―196.Zhou Wanghua.Modern concret e composit e st ructures[M].Beijing:China Architecture&Building Press,1998:154―196.(in Chinese)
[17]吴方伯,刘彪,罗继丰.预应力混凝土叠合空心楼板的受剪性能试验研究[J].工程力学,2016,33(3):196―203.Wu Fangbo,Liu Biao,Luo Jifeng.Experimental study on shear resisting properties prestressed concrete composite hollow core slabs[J].Engineering Mechanics,2016,33(3):196―203.(in Chinese)
[18]崔士起,刘传卿,刘文政,等.分离式接缝叠合板垂直接缝方向抗弯刚度的试验及计算方法研究[J].建筑结构学报,2018,39(9):75―84.Cui Shiqi,Liu Chuanqing,et al.Research on experiment and calculating methods of flexural stiffness in direction perpendicular to separating-type joints for concrete composite slab[J].Journal of Building Structures,2018,39(9):75―84.(in Chinese)
[19]过镇海,王传志.多轴应力下混凝土的强度和破坏准则研究[J].土木工程学报,1991(3):1―14.Guo Zhenhai,Wang Chuanzhi.Study on strength and failure criterion of concrete under multi-axial stress[J].China Civil Engineering Journal,1991(3):1―14.(in Chinese)
[20]田春雨,聂建国.组合楼盖竖向承重体系中楼板变形及内力分析[J].工程力学,2006,23(5):62―66.Tian Chunyu,Nie Jianguo.Analysis of deflection and internal force in composite slab-on-girder floor system[J].Engineering Mechanics,2006,23(5):62―66.(in Chinese)
[21]庞瑞,许清风,梁书亭,等.分布式连接全装配RC楼盖竖向承载力与变形分析[J].工程力学,2019,36(4):147―157.Pang Rui,Xu Qingfeng,Liang Shuting,et al.Analysis of the vertical strength and deflection of discrete connected precast RC floor system[J].Engineering Mechanics,2019,36(4):147―157.(in Chinese)
[22]姚凌.建筑结构静力计算手册[M].北京:中国建筑工业出版社,2001:194―239.Yao Ling.Static calculation mual of building structures[M].Beijing:China Architectural&Building Press,2001:194―239.(in Chinese)
[23]杨耀乾.平板理论[M].北京:中国铁道出版社,1984:207―240.Yang Yaokun.Theory of tablet[M].Beijing:China Railway Publishing House,1984:207―240.(in Chinese)
[24]Reddy J N.Theory and analysis of elastic plates and shells[M].2nd ed.Boca Raton:CRC Press,2007:215―259.