Research On Seismic Behavior Of Spaced Single-hole Filled Concrete Gypsum Composite Wallboard

In order to improve the shear coefficient of sandwich wall slabs and to meet the standards to be used in different floors of buildings,this paper proposes a gypsum hollow-core slab with box-like grids based on the gypsum hollow-core slabs with horizontal and vertical holes.By adding steel bars and concreting every other hole,the new concrete and gypsum sandwich wall slabs with columns and grid beams are made.Its earthquake resistant behaviors were tested.This paper aims to research the following points:(1)Proposal of the new concrete and gypsum sandwich wall slabs.Take a gypsum hollow-core slab with horizontal and vertical holes,and place two horizontal gypsum ribs on the crossing of each horizontal and vertical hole for every other vertical hole,and a closed hollow-core gypsum grid is formed inside the slab.That is the gypsum hollow-core slab with box-like grids.Concreting the vertical holes that have no gypsum grid,and the concrete gypsum sandwich wall slabs with columns and grid beams are formed.(2)Earthquake resistant behaviors tests of the new wall slabs.Take 3 new wall slabs,3 solid-core sandwich wall slabs,and 1 hollow-core slab to run the low-cyclic load tests,and get earthquake resistant behaviors indicators of different slabs such as the failure characteristics,hysteretic behavior,bearing capacity,dissipation capacity,and stiffness degradation.Compare the indicators to analyze the differences on failure characteristics and earthquake resistant behaviors indicators.The results show that the new slab uses 9.5% less concrete and 40% less core column steel bars than the solidcore slab,with evenly transmission of force and good overall.Its bearing capacity is90% of that of the solid-core slab,with similar dissipation capacity and better ductility.(3)Numerical modelling and analysis of the new wall slab’s earthquake resistant behaviors.Use ABAQUS software to build a finite element model of the new slab,and analyze its damage development rules and hysteretic curve characteristics.Comparing to the test results,the finite element model is proved correct.Use the model to analyze the influence of axial compression ratio,reinforcement ratio,and concrete intensity on the new slab’s earthquake resistance behaviors.The results show that with the growth of axial compression ratio and core column vertical reinforcement ratio,the slab’s bearing capacity and dissipation capacity improves accordingly,and the stiffness degradation has little changes;with the growth of concrete intensity,the slab’s bearing capability gradually slows down,the dissipation capacity tends to be reducing,and the stiffness degradation becomes obvious.