Experimental and numerical simulation study on the bearing performance of coiled formwork brackets
The coiled formwork bracket has emerged as a highly recommended formwork solution due to its lightweight design,impressive strength,versatile applications,and user-friendly operation.This study employs a blend of experimental testing and numerical simulations to delve into the safety bearing mechanism of buckle-type formwork support systems,exploring various diagonal rod layout configurations and vertical rod docking modes.Linear buckling analysis and post-buckling analysis,incorporating geometric nonlinearity,are conducted to explore the stable bearing capacity and failure mode characteristics.Various oblique rod layout configurations are employed to construct models with pole butt connections,and three distinct models of coiled formwork brackets are tested to corroborate the numerical simulation outcomes.The ABAQUS finite element software is utilized to simulate and analyze the coiled formwork support unit frame,employing three distinct arrangements of inclined bars.Test data from buckle joint tests are integrated into the finite element analysis,enabling a comprehensive comparison with experimental outcomes.The findings indicate that the adoption of diagonal layout results in optimal bearing capacity for the coiled formwork brackets.This superiority is attributed to a clear diagonal load transfer path,minimizing the risk of horizontal frame collapse and vertical buckling.Among the tested configurations,MJ3,featuring a diagonal arrangement of diagonal rods,exhibits the smallest maximum horizontal displacement at the top layer.Furthermore,MJ3 demonstrates superior overall horizontal stiffness compared to MJ1 and MJ2 configurations.The vertical diagonal rod arrangement in MJ3 is considered relatively reasonable.Notably,the results of the nonlinear post-buckling analysis of the unit frame align closely with the experimental findings,with the margin of error remaining within 8％.In the numerical simulation calculations of the formwork bracket frame,the process begins with linear buckling analysis,followed by the introduction of geometric initial defects for nonlinear post-buckling analysis.This iterative process of mutual verification between numerical calculations and experimental results establishes the groundwork for developing an accurate template support finite element calculation model.Such a model serves as a valuable reference for conducting further numerical analyses of formwork brackets in practical engineering projects.
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