The Study Of The Internal Force Analysis Of Cast-in-place Slab Under The Horizontal Load And Its Influence On The Performance Of RC Frame

The slab and frame beam are casted together and form the horizontal system of the whole structure,the overall stiffness of the structure and the flexural rigidity of the framework beam are effectively improved,which make the failure mechanism "strong column and weak beam” proposed in the current specification very difficult to achieve.And also the quality of floor and the load is the source of horizontal inertial forces Therefore,the study of the influence between cast-in-place slab and the whole structure is of significance.In this paper,the distribution of the internal force in slab under horizontal load and the influence of the existence of the slab on the overall performance of the RC frame structure are studied.The main contents include the following aspects:(1)In order to study the influence of cast-in-place slab on the dynamic characteristics of the whole structure,the characteristics model analysis and static elastic-plastic analysis of a model with a slab,a model without a slab,a model without a slab but with the quality of the slab is carried out respectively and the quality of cast-in-place slab and stiffness influence on the structure of the overall stiffness and flexural stiffness of frame beam is studied.Meanwhile,though the change of the section size of the component and the analysis of single parameter and multi parameter analysis,utilizing the quality impact coefficient and stiffness derived and fitted to analyze their influence on the structural dynamic characteristics.(2)In order to study on the working mechanism of cast-in-place slab itself,this paper based on the calculation method of internal force of structure under horizontal earthquake,using inverted triangle lateral static loading method,respectively analyzes internal force distribution and the regularities of the distribution of each slab under the horizontal load.Meanwhile by changing the stiffness of the beam column line and the ratio of beam to study the influence of the variation of the parameter on the internal force distribution.(3)The enhancement of the bearing capacity of the floor is analyzed and the change of the effective flange width of the beam-receiving zone at different nodes under different horizontal lateral displacement conditions is studied,respectively the influence of the change of the effective flange width at different nodes is analyzed by the change of the parameters of the beam column and the span.And the floor's effect is also taken into account to analyze the change of the effective flange width at different nodes,the improved method of concrete frame structure design considering the effect of floor reinforcement is respectively studied and a practical project is verified by this improved method.The results of this paper can be summarized as follows: The influence of floor on the performance of frame structure is studied by theoretical analysis and finite element simulation and the influence of floor parameters on the general stiffness of the structure is evaluated by using the static and dynamic evaluation indexes,respectively the mechanism of the characteristic slab under the horizontal load is analyzed and the finite element model was used to analyze the effect of the effective flange width and the cross-sectional dimension of the beam section on the mechanism of “strong column weak beam”...