现浇钢筋混凝土空心板无梁楼盖弹塑性分析
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摘要
现浇钢筋混凝土空心板无梁楼盖,是继普通梁板楼盖、密肋楼板楼盖、无粘结预应力楼盖之后开发的一种现浇钢筋混凝土新型楼盖体系,它融合了预制空心板、无梁楼板、密肋楼板等各自优点于一体,将受力性能良好的工字梁与蜂窝状结构特性运用到楼板结构中去。由于它满足人们对建筑物的层高、大空间、灵活间隔等方面提出的更高要求,因此被越来越多的建设单位所接受和采用。
和普通平板无梁楼盖相比,现浇钢筋混凝土空心板无梁楼盖有三个突出的不同点:一是在楼板内预埋空心圆管形成空心楼板;二是在框架柱之间设有暗扁梁;三是比一般的无梁楼盖厚。由于混凝土材料的抗拉强度低、应力与应变关系呈非线性等原因,钢筋混凝土楼盖在荷载不大的情况下便可能开裂,非线性变形得到发展,使结构的分析与设计更加复杂。虽然对板和楼盖的研究开始很早,并且已经提出了许多分析与设计方法,但是,由于空心板无梁楼盖自身的特点,人们对空心板无梁楼盖的受力性能说法不一,特别是在弹塑性状态下的性能还不是很清楚。本文以现浇钢筋混凝土空心板无梁楼盖的特点为基础,分析它的基本力学性能,探索合理的计算模式和设计方法,对正确进行设计、保障结构的安全使用、进一步推广它的应用,有非常重要的意义
本文首先从钢筋混凝土材料的弹塑性本构关系着手,讨论了混凝土的破坏准则以及各种破坏模型。其次,基于大型有限元软件ANSYS,对钢筋混凝土结构在非线性分析中出现的各种单元作了具体分析讨论,建立了更加符合实际情况的空心板模型,并对单跨空心板无梁楼盖进行了自重模拟及从加荷、开裂、屈服直至破坏的全过程材料非线性的有限元计算,得到了空心板在竖向荷载作用下的开裂荷载、破坏荷载及位移和应力分布规律;通过对有限元计算结果的分析得到了一些结论,对改进现浇空心板无梁楼盖的构造措施有一定的参考价值。通过理论分析和有限元计算,本文认为现浇钢筋混凝土空心板无梁楼盖垂直孔方向刚度与顺孔方向刚度比可以取为0.8;设计时可以依据实心板的跨度比值来判断单双向板。以上研究成果对实际工程有实践意义和应用价值,可以作为工程界的参考。
Cast-in-situ hollow reinforced concrete floor system (CHRCF) is a new system of cast-in-situ reinforced concrete floor come after ordinary beam slab floor, waffle floor prestressed concrete without adhesion floor, which integrate merits of precast core slab, flat slab floor, beram and girder floor, put performance good in stress of I-shape beam and honeycomb structure characteristic into floor structure. Because it satisfies the people’s higher request to building store height, big space, flexible in comparting and so on, therefore it is accepted by the more and more construction units.
Compares with the ordinary plate beamless roof, CHRCF has three prominent diversities: First, buries the hollow circular pipe in the floor to form the hollow floor in advance; secondly, equipped with thin-walled beam between the frame column; finaly, thicker than the common beamless roof. Because of the low tensile strength of concrete material and the relationship between stress and strain is non-linearity etc, the reinforced concrete floor may cracks in the small load situation, the non-linear distortion obtains development, which lead to more complex structure analysis and the design. Although the research of concrite slab and floor started early, and already proposed many analysis and design method, but, because of the core slab beamless roof own characteristic, the explanations to core slab beamless roof stress performance is different, especially stress performance under the elastoplasticity condition is not very clear. This article based on the CHRCF’s characteristic, analyzes its basic mechanics performance and explores the reasonable computation pattern and design method, which has the extremely vital significance to design, safeguard structure’s safe using and further promoting its application.
Firstly, this article began from the reinforced concrete material elastoplasticity’s constitutive relation, discuss the concrete destruction criterion as well as all kinds of destruction model. Next, based on finite element software ANSYS, did analysis and discussion to each kind of unit which appeared in the nonlinear analysis of the concrete reinforced concrete structure, established core slab model conforme to the actual situation, did deadweight simulation to single span core slab beamless floor and its material non-linear finite element computation from adds load, crazes, submits until destroyed. Obtained the core slab’s dehiscence load, destruction load, the displacement and the stress distributed rule under vertical load. Obtained some conclusions which gives certain reference value to improve the CHRCF’s structure, after analysis to the finite element computed result. Through the theoretical analysis and the finite element computation, this article thought that the ratio of vertical hole direction rigidity and along the hole direction rigidity may take 0.8 in the CHRCF. Above research results have the practical significance and application value to the actual project, can be the reference to engineering.
和普通平板无梁楼盖相比,现浇钢筋混凝土空心板无梁楼盖有三个突出的不同点:一是在楼板内预埋空心圆管形成空心楼板;二是在框架柱之间设有暗扁梁;三是比一般的无梁楼盖厚。由于混凝土材料的抗拉强度低、应力与应变关系呈非线性等原因,钢筋混凝土楼盖在荷载不大的情况下便可能开裂,非线性变形得到发展,使结构的分析与设计更加复杂。虽然对板和楼盖的研究开始很早,并且已经提出了许多分析与设计方法,但是,由于空心板无梁楼盖自身的特点,人们对空心板无梁楼盖的受力性能说法不一,特别是在弹塑性状态下的性能还不是很清楚。本文以现浇钢筋混凝土空心板无梁楼盖的特点为基础,分析它的基本力学性能,探索合理的计算模式和设计方法,对正确进行设计、保障结构的安全使用、进一步推广它的应用,有非常重要的意义
本文首先从钢筋混凝土材料的弹塑性本构关系着手,讨论了混凝土的破坏准则以及各种破坏模型。其次,基于大型有限元软件ANSYS,对钢筋混凝土结构在非线性分析中出现的各种单元作了具体分析讨论,建立了更加符合实际情况的空心板模型,并对单跨空心板无梁楼盖进行了自重模拟及从加荷、开裂、屈服直至破坏的全过程材料非线性的有限元计算,得到了空心板在竖向荷载作用下的开裂荷载、破坏荷载及位移和应力分布规律;通过对有限元计算结果的分析得到了一些结论,对改进现浇空心板无梁楼盖的构造措施有一定的参考价值。通过理论分析和有限元计算,本文认为现浇钢筋混凝土空心板无梁楼盖垂直孔方向刚度与顺孔方向刚度比可以取为0.8;设计时可以依据实心板的跨度比值来判断单双向板。以上研究成果对实际工程有实践意义和应用价值,可以作为工程界的参考。
Cast-in-situ hollow reinforced concrete floor system (CHRCF) is a new system of cast-in-situ reinforced concrete floor come after ordinary beam slab floor, waffle floor prestressed concrete without adhesion floor, which integrate merits of precast core slab, flat slab floor, beram and girder floor, put performance good in stress of I-shape beam and honeycomb structure characteristic into floor structure. Because it satisfies the people’s higher request to building store height, big space, flexible in comparting and so on, therefore it is accepted by the more and more construction units.
Compares with the ordinary plate beamless roof, CHRCF has three prominent diversities: First, buries the hollow circular pipe in the floor to form the hollow floor in advance; secondly, equipped with thin-walled beam between the frame column; finaly, thicker than the common beamless roof. Because of the low tensile strength of concrete material and the relationship between stress and strain is non-linearity etc, the reinforced concrete floor may cracks in the small load situation, the non-linear distortion obtains development, which lead to more complex structure analysis and the design. Although the research of concrite slab and floor started early, and already proposed many analysis and design method, but, because of the core slab beamless roof own characteristic, the explanations to core slab beamless roof stress performance is different, especially stress performance under the elastoplasticity condition is not very clear. This article based on the CHRCF’s characteristic, analyzes its basic mechanics performance and explores the reasonable computation pattern and design method, which has the extremely vital significance to design, safeguard structure’s safe using and further promoting its application.
Firstly, this article began from the reinforced concrete material elastoplasticity’s constitutive relation, discuss the concrete destruction criterion as well as all kinds of destruction model. Next, based on finite element software ANSYS, did analysis and discussion to each kind of unit which appeared in the nonlinear analysis of the concrete reinforced concrete structure, established core slab model conforme to the actual situation, did deadweight simulation to single span core slab beamless floor and its material non-linear finite element computation from adds load, crazes, submits until destroyed. Obtained the core slab’s dehiscence load, destruction load, the displacement and the stress distributed rule under vertical load. Obtained some conclusions which gives certain reference value to improve the CHRCF’s structure, after analysis to the finite element computed result. Through the theoretical analysis and the finite element computation, this article thought that the ratio of vertical hole direction rigidity and along the hole direction rigidity may take 0.8 in the CHRCF. Above research results have the practical significance and application value to the actual project, can be the reference to engineering.
引文
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