预应力混凝土空心叠合板的试验研究与分析
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摘要
本文的研究是基于一种新型专利“WFB装配整体式预应力空心楼盖”。这种楼盖是先在工厂制作WFB预应力空心预制板,然后在现场浇筑预制空心板之间凹槽处混凝土,从而形成的一种装配整体式楼盖。其预制构件的预应力筋采用消除应力高强螺旋肋钢丝,截面高度达叠合板的最终设计高度,具有承载力高和刚度大的特点,施工时无需设置跨中临时支撑。这种装配整体式楼盖结合了传统的预制装配式楼盖和现浇整体式楼盖的优点,具有施工进度快、节省模板、降低造价等特点;同时也减少了楼盖的自重,增大了楼盖的抗裂性能,并为采用高强混凝土创造了有利条件。
本文对WFB预应力空心预制板及叠合板进行了加载试验,分析了其受力性能。试验研究表明,WFB预应力空心预制板及叠合板的极限承载力较高,抗裂性能好,在标准荷载作用下试件均未开裂,在正常使用状态下的挠度能够满足规范要求;可以按照《混凝土结构设计规范》(GB50010-2002)中叠合构件的相关公式计算其极限承载力、裂缝和挠度。
通过两跨WFB预应力连续叠合空心板试验,对这种连续叠合板的受力性能进行了研究,试验结果表明其极限荷载值可按塑性理论进行计算;对连续板的弯矩重分布特征进行了分析,并建议将WFB预应力连续叠合空心板的边跨最大正弯矩和中间支座的最大负弯矩的弯矩系数分别取为0.1和-0.08。
本文对WFB装配整体式预应力空心楼盖进行了静水加载试验和有限元分析。试验研究表明,在正常使用荷载作用下,试验楼盖在加载过程中表现出了明显的双向受力特征,具有良好的整体工作性能;可按照弹性薄板小挠度理论对试验楼盖进行挠度计算;并对楼盖正交两个方向上的弹性抗弯刚度进行了分析。根据有限元分析理论,采用ANSYS程序,建立了WFB装配整体式预应力空心楼盖的有限元模型,有限元计算结果表明,有限元模型能够很好地模拟试验楼盖的实际情况,计算结果与试验结果吻合良好。
A new patent called WFB assembled monolithic prestressed concrete hollow-core floor is researched in this paper. The WFB prestressed concrete hollow-core precast slab is made in the factory, then the cast-in-place concrete is poured into flute between the precast slabs, which forms an assembled monolithic floor. The high intention spiral ribbed bar is used for tendon, the height of section of the precast slab is equal to the final designed height of the composite slab, so that the precast slab has higher ultimate carrying capability and higher rigidity, which makes the precast slabs don’t need any interim braces to be supported in the mid-span in the construction. WFB assembled monolithic prestressed concrete hollow-core floor has much excellence of the precast assembled floor and the in-place floor, it can not only speed up construction, save formwork, reduce the cost and so on, but aslo can reduce the deadweight of floor, enhance crack resistance, and create favorable condition for using high-strength concrete.
We carry out the experiment of WFB prestressed concrete hollow-core precast slabs and composite slabs, analysis their capability of bearing the load. The experimental research indicates that WFB prestressed concrete hollow-core precast slabs and composite slabs have higher ultimate carrying capability and better crack resistance, the test slabs don’t cracked under the normal load, the displacement can satisfy the requirement of the code under normal condition; the ultimate carrying capability, crack and displacement of the slabs can be calculated according to the correlative formula of code for design of concrete structures(GB50010-2002). According to the experiment of two-span WFB prestressed concrete hollow-core composite continuous slabs, the capability of bearing the load is researched, which indicate that we can calculate the ultimate load according to the theory of plasticity; we also analysis the redistribution feature of moment of flexure and suggest that the moment coefficients of the maximal plus moment and the minimum minus moment of WFB prestressed concrete hollow-core composite continuous slabs are 0.1 and-0.08.
In this paper, in the light of the experiment on a WFB assembled monolithic prestressed concrete hollow-core floor slab under static water and finite element analysis, its working performances are studied and analyzed. The experimental result indicates that working characters of the test floor slab is typically two-way obviously and has excellent bulking property under normal using load; the displacement of the test floor slab can be calculated by the theory of elastic thin plank, the elastic bending rigidity in orthogonal direction of the test floor slab is researched. According to the theory of finite element analysis and ANSYS programme, the finite element model of the WFB assembled monolithic prestressed concrete hollow-core floor slab is established, the result of finite element calculation indicates that the finite element model can simulate the actuality of the test floor slab well, the result of calculation is closely meet the test.
本文对WFB预应力空心预制板及叠合板进行了加载试验,分析了其受力性能。试验研究表明,WFB预应力空心预制板及叠合板的极限承载力较高,抗裂性能好,在标准荷载作用下试件均未开裂,在正常使用状态下的挠度能够满足规范要求;可以按照《混凝土结构设计规范》(GB50010-2002)中叠合构件的相关公式计算其极限承载力、裂缝和挠度。
通过两跨WFB预应力连续叠合空心板试验,对这种连续叠合板的受力性能进行了研究,试验结果表明其极限荷载值可按塑性理论进行计算;对连续板的弯矩重分布特征进行了分析,并建议将WFB预应力连续叠合空心板的边跨最大正弯矩和中间支座的最大负弯矩的弯矩系数分别取为0.1和-0.08。
本文对WFB装配整体式预应力空心楼盖进行了静水加载试验和有限元分析。试验研究表明,在正常使用荷载作用下,试验楼盖在加载过程中表现出了明显的双向受力特征,具有良好的整体工作性能;可按照弹性薄板小挠度理论对试验楼盖进行挠度计算;并对楼盖正交两个方向上的弹性抗弯刚度进行了分析。根据有限元分析理论,采用ANSYS程序,建立了WFB装配整体式预应力空心楼盖的有限元模型,有限元计算结果表明,有限元模型能够很好地模拟试验楼盖的实际情况,计算结果与试验结果吻合良好。
A new patent called WFB assembled monolithic prestressed concrete hollow-core floor is researched in this paper. The WFB prestressed concrete hollow-core precast slab is made in the factory, then the cast-in-place concrete is poured into flute between the precast slabs, which forms an assembled monolithic floor. The high intention spiral ribbed bar is used for tendon, the height of section of the precast slab is equal to the final designed height of the composite slab, so that the precast slab has higher ultimate carrying capability and higher rigidity, which makes the precast slabs don’t need any interim braces to be supported in the mid-span in the construction. WFB assembled monolithic prestressed concrete hollow-core floor has much excellence of the precast assembled floor and the in-place floor, it can not only speed up construction, save formwork, reduce the cost and so on, but aslo can reduce the deadweight of floor, enhance crack resistance, and create favorable condition for using high-strength concrete.
We carry out the experiment of WFB prestressed concrete hollow-core precast slabs and composite slabs, analysis their capability of bearing the load. The experimental research indicates that WFB prestressed concrete hollow-core precast slabs and composite slabs have higher ultimate carrying capability and better crack resistance, the test slabs don’t cracked under the normal load, the displacement can satisfy the requirement of the code under normal condition; the ultimate carrying capability, crack and displacement of the slabs can be calculated according to the correlative formula of code for design of concrete structures(GB50010-2002). According to the experiment of two-span WFB prestressed concrete hollow-core composite continuous slabs, the capability of bearing the load is researched, which indicate that we can calculate the ultimate load according to the theory of plasticity; we also analysis the redistribution feature of moment of flexure and suggest that the moment coefficients of the maximal plus moment and the minimum minus moment of WFB prestressed concrete hollow-core composite continuous slabs are 0.1 and-0.08.
In this paper, in the light of the experiment on a WFB assembled monolithic prestressed concrete hollow-core floor slab under static water and finite element analysis, its working performances are studied and analyzed. The experimental result indicates that working characters of the test floor slab is typically two-way obviously and has excellent bulking property under normal using load; the displacement of the test floor slab can be calculated by the theory of elastic thin plank, the elastic bending rigidity in orthogonal direction of the test floor slab is researched. According to the theory of finite element analysis and ANSYS programme, the finite element model of the WFB assembled monolithic prestressed concrete hollow-core floor slab is established, the result of finite element calculation indicates that the finite element model can simulate the actuality of the test floor slab well, the result of calculation is closely meet the test.
引文
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[2] Cook J P.Composite Structure Methods.New york:McGraw-Hill Book Company inc,1976,121-150
[3] 周旺华.现代混凝土叠合结构.北京:中国建筑工业出版社,1998,12-180
[4] 原湖北建筑工业学院等编译.装配整体式结构编译文集.武汉:原湖北建筑工业学院,1978,122-158
[5] 原西德混凝土和钢筋混凝土结构设计和施工规范.1972,345-450
[6] 中国建筑标准设计研究所.由预应力薄板和后浇混凝土组成的连续板.北京:中国建筑标准设计研究所,1982,1-16
[7] 法国建筑科学技术中心.用预制薄板和现浇混凝土层组成的空心楼板的技术规定.1979,15-26
[8] 肖龙.钢筋混凝土结构施工合理化的半预制结构体系.建筑技术开发,1994(4):34-53
[9] 蒋森荣.预应力钢筋混凝土结构学.北京:建筑工程出版社,1959,56-78
[10] 朱伯龙.装配整体式密肋楼板的理论及试验研究.上海:同济大学科学技术情报站,1961,56-78
[11] 中华人民共和国规范.钢筋混凝土结构设计规范(TJ10-74).北京:中国建筑工业出版社,1974, 45-48
[12] 国家建委建筑科学研究所.冷拔低碳钢铰线在多层厂房结构中的应用.北京: 国家建委建筑科学研究所,1977,3-18
[13] 周晓芬,朱丽松,黄海等.高效预应力混凝土叠合结构在高层建筑中的应用.建筑结构,1997(10):8-11
[14] 四川省电力设计院.叠合结构在小火电工程中的应用.成都:四川省电力设计院.1985,1-54
[15] 石玲,贺采旭.两跨预应力混凝土连续叠合板的弯矩调幅值的试验研究.武汉水利电力学院学报,1991,37(3):102-135
[16] ACI - ASCE Committee 333.Tentative Recommendations for Design of Composite Beams and Girder for Biuldings.J.of ACI.1960,57(12):609-628
[17] Douglas, Mechenry el.Development of continuity in precast prestressed construction.sixth congress of international Association for Bridge and Structural engineering,1961,87-96
[18] Zoltán V. Nagy1,István Szatmári2.Composite Slab Design.2nd Int.PhD Symposium in Civil Engineering 1998 Budapest,1998,16(4):25-30
[19] Elghazouli.A.Y,Izzuddin.B.A.Realistic Modeling of Composite and Reinforced Concrete Floor Slabs under Extreme Loading. II:Verification and Application. Journal of Structural Engineering,2004,130(12):1985-1996
[20] Clinton.O.R,Easterling.W.S.Behavior and Modeling of Reinforced Composite Slab in Tension.Journal of Structural Engineering,2000,126(7):764-771
[21] 周旺华.国外装配整体梁板设计方法研究评述.建筑技术通讯—建筑结构,1990(6):17-18
[22] 铁道部建厂工程局科研所,中国建筑科学院结构所.大开间预应力叠合式连续板的试验研究.北京:中国建筑科学院结构所,1982,24-85
[23] 卢盛澄等.预应力叠合连续板.成都:四川建筑科学研究所,1982,16-20
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