【作者】 杨丽；

【导师】 陶忠；

【作者基本信息】 昆明理工大学 ， 结构工程， 2019， 硕士

【摘要】 传统叠合楼盖采用平板式预制构件,但其在运输中容易折断、质量难以控制,且施工工艺复杂。进而出现了带肋预制构件,其初始刚度大、承载力高,自重轻,但仅能实现单向受力,且与肋正交方向的抗裂性不好。基于此,吴方伯等提出了 PK板,其在肋上预留孔洞,在孔洞中布设横向穿孔钢筋,在多块PK预制构件拼缝处布置抗裂钢筋,从而实现PK板的双向受力,且抗裂性能良好。但PK预制构件在生产过程中无法实现一次性施工,即肋与平板要分两次施工,且支模复杂。因此,课题组将PK板进行了改进,即在PK板的混凝土肋上外包一对背靠背的冷弯薄壁内卷边C型钢,并将改进后的板称为PKG板,其可以解决PK板肋部支模困难的问题,使得预制构件能够一次性成型,提高了工业化预制程度,同时大大提高了构件的刚度和承载能力。以PKG预应力混凝土叠合楼板为研究对象,本文的主要研究内容和结论如下:(1)对PKG预应力混凝土叠合板进行了构件设计,并编制MATLAB程序计算出其各重要力学性能指标,为有限元模拟和试验提供理论依据。(2)PKG预应力混凝土叠合板工业化程度高,其预制构件可一次成型,无须两次制作,预制效率高。(3)对PKG预应力混凝土叠合板进行了均布荷载作用下的静载试验,试验参数为:跨度、肋高、肋宽、构件类型和C型钢的配钢量。试验结果表明,叠合面未滑移,抗剪性能良好;PKG叠合板整体性好、刚度大、承载力高、恢复性能和抗裂性能优良,且最终的破坏模式为受弯破坏,5个试验参数对PKG叠合板的受力性能均有不同程度的影响。(4)使用ANSYS有限元软件对与试验对应的6个构件进行了非线性有限元分析,通过对比发现各参数对构件受力性能的影响与试验结果一致,且各构件的破坏形态与试验吻合较好,验证了有限元模拟的合理性,可初步指导设计。(5)提出了一种引入等效跨度比的实用弹性计算方法,推导了均布荷载作用下PKG叠合板的极限承载能力与塑性铰线的形成位置,建立了 PKG叠合板两个正交方向的单位宽度极限弯矩简化计算公式,可为工程设计和实际运用提供一定的理论参考。更多还原

【Abstract】 The traditional composite floor adopts flat prefabricated components,but it is easy to break in transportation,the controls of quality is difficult,and the construction technology is complex Then there are ribbed prefabricated members,whose initial stiffness is large,bearing capacity is high,and self-weight is light,but only one-way force can be achieved,and the crack resistance is not hunk in the orthogonal direction with ribs.Based on this,Wu Fangbo and others put forward the PK slab,which has reserved holes on the ribs,setting transverse perforated steel bars in holes,and setting anti-cracking steel bars at the joints of several PK prefabricated components,so as to realize the bidirectional force of the PK slab,and the anti-cracking performance is fine.However,the PK prefabricated components can not be constructed once in the production process,the ribs and flat should be constructed twice,and the supporting formwork is complex.Therefore,the research group has improved the PK slab,that is to wrap a pair of back-to-back cold-formed thin-walled inner-curling C-shaped steel on the concrete ribs of the PK slab,and the improved slab called PKG slab,which can solve the problem that supporting formwork is difficult for the rib of the PK slab,the prefabricated components can be formed at one time,improving the degree of industrial prefabrication,and greatly improving the stiffness and load-bearing capacity of the components.Taking PKG prestressed concrete composite floor as the research object,the main research contents and conclusions of this paper are as follows:(1)The components of PKG prestressed concrete composite slab are designed,and some important mechanical properties are calculated by MATLAB program,which provides theoretical basis for finite element simulation and test(2)The PKG prestressing concrete composite slab has a high degree of industrialization.Its prefabricated components can be formed at one time and without two fabrications,the prefabrication efficiency is high(3)The static load test of PKG prestressed concrete composite slab under uniform load is carried out.The test parameters are span,rib height,rib width,component type and the amount of C-section steel.The test results show that the overlap surface can not slip,and the shear resistance is plummy;the PKG composite slab has hunk integrity,large stiffness,high bearing capacity,fine restoring performance and anti-cracking performance,and the ultimate failure mode is bending failure,the five test parameters have different effects on the mechanical property of the PKG composite slab.(4)Using ANSYS finite element software,six components corresponding to the test are analyzed by non-linear finite element method.Through comparison,it is found that the influence of each parameter on the mechanical properties of the components is consistent with the test results,and the failure modes of the components bring into correspondence with the test results,which verifies the rationality of finite element simulation and can preliminarily guide the design(5)A practical elastic calculation method with equivalent span ratio is proposed,the ultimate bearing capacity and the forming position of plastic hinge line of PKG composite slab under uniform load are deduced,simplified formulas of ultimate bending moment per unit width in two orthogonal directions of PKG composite slab are established,which can provide theoretical reference for engineering design and practical application.更多还原