Analysis of bearing characteristics of underpinning beam considering bond-slip constitutive model
Finite element analysis of the bond-slip between section steel and concrete is a critical approach to understanding the deformation characteristics of steel-reinforced concrete underpinning beams.Two finite element models are established using finite element software:one considers the bond-slip constitutive relationship between section steel and concrete,while the other does not.The paper analyzes the load-deflection curve,strain of section steel,and stirrup strain.The results indicate that,without considering bond-slip,the underpinning beam exhibits an ultimate strength capacity and mid-span deflection difference with the test results in the percentage range of 1.0%to 6.8%and 11.3%to 24.5%,respectively.The percentage differences for the web strain in the middle of the shear section,web strain in the middle of the beam span,inner stirrup strain,and outer stirrup strain concerning test values are 23.1%,46.4%,15.8%,and 45.8%,respectively.When the bond-slip is taken into account,the underpinning beam's ultimate strength capacity and mid-span deflection difference with the test results fall within the percentage range of 0.7%to 4.5%and 5.7%to 18.2%,respectively.The differences for the web strain in the middle of the shear section,web strain in the middle of the beam span,inner stirrup strain,and outer stirrup strain concerning test values are 2.7%,1.3%,11.6%,and 27.7%,respectively.Therefore,the infinite element model considering the bond-slip between section steel and concrete provides a more accurate simulation of bearing capacity and deformation.
steel reinforced concreteunderpinning beamfinite element analysisbond-slip
万方数据
维普
