Characteristic Analysis Of Hollow Floor Structure Under Horizontal Seismic Action

From the 21st century, there is obviously showing a trend of increase in the number of the earthquake, while the use of hollow floor structure also gradually from the underground to the ground and the structure on the ground tends to be affected by the horizontal earthquake action. And the hollow slab is a very important part in the transmission of the seismic effect, being different from ordinary slab which don’t be involved in the analysis of the seismic effect. So, there is a realistic meaning that taking a deep perceive of the seismic dynamic characteristics of the hollow floor in the present.In the early studies of slab-column structure has focused on the internal force distribution under the effect of vertical load. At the same time, the standard is recommended to use equivalent frame method or finite element method to analyze hollow floor structure’s distribution of internal force under horizontal load, but there is not an explicit explanation of the characteristic of hollow floor structure under horizontal load, so it’s different to do detailed optimization design of hollow floor structure.To solve these problems, this paper mainly completed the following research work:1、Through the summary of the preliminary research results, it is concluded that the force transmission way ofplastic mold box of cast-in-situ hollow floor structure under vertical load is same as the solid slab-column structure, on middle strip, column strip, column.2、Calculating out the discriminating function of damage coefficient of concrete damage model in ABAQUS analyzing.3、In the analysis of hollow floor structure, using two model of the floor to compare the effect of column cap, to the distribution of internal force under horizontal force. At the different strips, calculating out the internal force and stress at different section, and comparing the different value of the internal force at same section of different strips, while observing the change trend of the internal force at same section in one strip. Specifically, Span thickness ratio of hollow slab is 30 or so, column cap has a more effect to internal force distribution and mode of the floor structure. With the column cap, the overall floor structure can resistance to deformation, increasing floor structure horizontal deformation resistance, while with no the column cap, the interaction force of each column of the structure can be neglected, to resistance to deformation alone. According to of the distribution of internal force of each strip, there can conclude to three strips, that is, middle strip, column strip and mixed strip. The column strip and mixed strip have a similar across distribution, and the middle strip and mixed strip have a similar shear distribution. The column cap has little effect to the partition of strip. While the max value of the internal force is concentrating at slab column connections, and the value is decreasing quickly as the distance between the sections to the slab column connections until middle strip. In practical design, when the hollow floor structure is under the action of the horizontal load, the width of equivalent frame can use the width of column strip and assuming that there is not shear force at the section of middle strip.4、According to the modal and cycle, using principles of similar dynamic characteristics by analyzing a variety of different floor structure, to choose a similar model to substitute for the hollow floor structure in the analysis of PKPM for the main structure design. And according to the hollow floor structure load-bearing characteristics, summarizes the size principles of the rib floor structure with a hole, to substitute for hollow floor structure. After, using the software of ABAQUS to analyze hollow floor structure in nonlinear dynamic seismic action, and consuming some optimization suggestions.