Analysis On Load-Bearing Performance Of Multi-ribbed Composite Wall Under Vertical Load

Multi-ribbed slab structure is a new structural system, characterized by energy-saving and good aseismic performance, whose development prospect is very good. Though much fruitful progress has been achieved in previous study, there still remains a lot to be studied and perfected as a new structural system. The thesis is devoted to studying on the multi-ribbed composite wall, which is the main bearing member in multi-ribbed slab structure. On the basis of the previous researches, experiments, theoretical analysis and numerical simulation by finite are employed to study the load-bearing performance, axial force distribution, bearing capacity under axial press and stabilization of the multi-story and moderate high- story multi-ribbed composite wall subjected to the vertical load. The main contents are presented as follows:1, Five 1/2-scaled model experiments of the multi-ribbed composite walls with one span and one story under vertical load are presented; the failure process, failure mode and vertical deformation performance of the wall under vertical load are studied; the thesis analyses the effect of ribbed beams in the wall under axial force and discuses the distribution characteristic and contribution of the vertical load among frame columns, ribbed-columns and filled blocks; meanwhile the impaction on compression capacity of multi-ribbed composite wall put by some factors such as initial flaw, eccentric loading, ratio of height to sectional thickness, with the filled blocks or not and different loading way is discussed, which provides the base for the built of the normal section bearing capacity formula of multi-ribbed composite wall under vertical load.2, Finite element analysis model of the multi-ribbed composite walls is established, and the precision and feasibility of models are proved by test data; the linear elastic analysis is used to study the axial force distribution among frame columns, ribbed-columns and filled blocks, which can obtain the influences on axial force distribution coefficient of each components by the number and location of layers and so on; the practical computing formula for distribution coefficient of axial force of each component in the multi-ribbed composite wall under vertical loads is built by the curve fitting.3, The paper constructs the practical normal section bearing capacity formula of multi-ribbed composite wall under vertical load with considering such two coefficients, which are developed by the blocks, as elevated coefficient of the axial compression capacity and stability coefficient of the multi-ribbed composite wall; By means of Finite Element Method (FEM), the paper performs nonlinear analysis on the multi-ribbed composite wall with focusing on the wall's stability. The effect of different factors to the wall's stability coefficient is discussed to get the computing formula for stability coefficient of the multi-ribbed composite wall with considering the blocks. Adopting the finite element model to analyses ultimate load in-plane cable-arch of the wall, and the computing formula for the elevated coefficient of bearing capacity of multi-ribbed composite wall under axial load is derived.