Analysis of the Influence of Differential Consolidation Settlement of Foundation on Redistribution of Internal Forces in Superstructure of Buildings

Abstract

In order to explore the influence of differential settlement of foundation on the internal force and deformation of super-frame structure, the stress and deformation of the traditional fixed support model and the elastic support model under the local effect of the differential settlement of the two columns are compared. The model without considering the settlement of the structure (Model 1), the traditional fixed support model (Model 2), and the vertical elastic support model (Model 3) are respectively constructed for analysis. The left end of the frame column and A/1-2 beam are taken as an example, the axial force of the frame column in Model 3 significantly decreases from -817.8kN to -415.3kN compared with Model 1, with a reduction of 49%; the shear force at the left end of the lower A/1-2 beam increases from 42.3kN to 43.5kN with an increase of 3%; and the bending moment increases from -27.2kN⋅m to 152.7kN⋅m. Those indicate the shear force and bending moment of the beam directly connected with the subsidence column under the action of the elastic support model are smaller than that under the action of the fixed support model. It is hoped that these change rules can provide reference for the design and reinforcement of similar projects in the future.