现浇无粘结预应力混凝土蜂巢式空心楼盖静力性能的参数影响分析及设计方法
[Abstract]:At present, ordinary solid floor and hollow floor can not meet the requirements of larger span and crack resistance. The pre-stressed concrete honeycomb hollow floor combines the prestress technology with the hollow floor technology, which is suitable for the buildings with larger span, and the honeycomb-type mandrel avoids the difference of the two-way stiffness of the cylindrical core mould. In recent years, the research of this kind of floor is in the normal use stage, its design mostly adopts the elastic theory method, the safety reserve is too large, which reduces the economic performance of the floor. Therefore, in order to make more reasonable use of prestressed concrete honeycomb hollow floor, it is necessary to study it further. In this paper, the ABAQUS finite element software is used to simulate the honeycomb hollow floor and unbonded prestressed unidirectional hollow slab in order to verify the accuracy of the finite element model. On this basis, by changing the bond between prestressed steel bar and concrete, the reinforcement ratio, rib spacing, rib width, span-height ratio, floor thickness and roof thickness of non-prestressed steel bar, The influence of these parameters on the mechanical and deformation properties of prestressed hollow floor is studied. The results of finite element analysis show that the bearing capacity of bonded pre-stressed slabs is greater than that of unbonded prestressed slabs. In the design, in the range of reasonable reinforcement ratio, changing the reinforcement ratio of non-prestressed steel bar is the best way to change the steel bar diameter, and the reinforcement ratio of non-prestressed steel bar is 0.6% / 0.7%. The setting of rib spacing should not be more than 1000mm, and 500mm~800mm is the best; the value of rib width is 60mm~80mm; the ratio of span to height is about 40? 42. If the requirement for building crack resistance is high, the thickness of roof should not be greater than that of floor. The difference between the thickness of roof and floor should not exceed 30mm, for the convenience of design and construction, the thickness of roof and floor can be taken as the same thickness, and the thickness is appropriate in 60mm~80mm. Secondly, taking a prestressed hollow double-direction floor with 15m 脳 15m as an example, the strip with unit width is equivalent to I-shaped section and rectangular section, respectively, for the two-way floor which is widely used at present. According to the existing theory of common solid two-way plate analysis, the elastic analysis method and the modified plastic hinge method are used to calculate the internal force, deflection check and ultimate bearing capacity under the normal service limit state, respectively. And with the help of ABAQUS finite element software to carry on the simulation verification. The results show that the internal force calculated by the modified plastic hinge method is more close to the finite element result when designing the floor, and the plate strip with unit width is the best I-shaped section in the calculation. For the calculation of ultimate bearing capacity, the standard elastic method is used to calculate the rectangular section and the plastic method is used to calculate the I-shaped section. The deflection of the floor in elastic state is equivalent to rectangular section and calculated by empirical coefficient method.
【学位授予单位】:广西大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TU378
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