Research On Mechanical Test Of Interaction Between Frame Grids And Filling Blocks Of Multi-ribbed Composite Wall

Multi-ribbed slab wall is a new energy-saving structure system which has a widely developing and application prospect. With its unique constructive characteristics, the multi-ribbed composite wall is made up of the concrete frame grids with the high performance filling blocks as main load-bearing members of the Multi-ribbed slab wall. The frame grids and the filling blocks are both basic elements of the multi-ribbed composite wall. The interaction between frame grids and filling blocks enables them to cooperate with each other, which has an important meaning for the mechanic performance of the entire composite wall.In order to study the mechanism of interaction between the two elements, the following steps are made in this paper.1. Tests of 23 specimens with different filling blocks and rigidity are reported, which include samples where axial forces are applied in the diagonal direction of the frame grids. The mechanic performances of specimens are analyzed and their mechanics of load-bearing and the failure characteristics are summarized.2. Equivalent model with diagonal bar of compression of the filling blocks are adopted and the calculation formula of rigidity and intensity are given. In the finite element analysis, the finite element models with the same size of the specimens are used to determining the stress status of the frame grids and the filling blocks.3. For the filling material selection, the performance indexes of normal filling materials used commonly in our country are collected and the comparison is made. Considering the optimization of composite wall slab design, finite element program is designed in which both the relative rigidity of the frame grids and the constrain extent of the filling materials are took into account Significance level tests and gradation analyzing of the influence factors about climactic displacement of frame grid elements and central node stress status of filling materials are adopted by means of orthogonalize bearing test simulation of the frame grid elements. Based on these analyses, propositional sampling range of performance indexes of filling material and the size and the dimension of frame grid elements are put forward.