Design Methods of Steel-concrete Composite Beams under Long-term Loading
To quantify the influence of aging deformation of concrete on the long-term behavior of steel-concrete composite beams and to propose their design methods,providing a reference for engineering applications.Based on existing experimental data,evaluate the applicability of the long-term performance design method for composite beams in current specifications On this basis,fully considering the comprehensive effects of various factors such as concrete shrinkage,creep,cracking,and interface sliding of composite beams,the calculation method of the long-term behavior of simply-supported and double-span steel-concrete composite beams was proposed and verified.The results indicated that the proposed long-term performance design method for composite beams can effectively predict the long-term mid-span deflection of simply-supported composite beams,long-term hogging moment,and mid-span deflections of double-span composite beams.The long-term deflection prediction value obtained by using the aging range of negative bending moment is 0.976 compared to the experimental value,with the maximum error between the predicted and test results of 16.5%.However,the ratio of the long-term predicted value and the test value of the composite beam obtained by the standard recommendations is 0.782.In conclusion,the range of hogging moment zones has a significant influence on the long-term behavior of multi-span continuous composite beams.The calculation method for the long-term performance of single-span and double-span steel-concrete composite beams proposed in this article can effectively enhance its prediction accuracy.
composite beamshrinkage and creepmid-span deflectiondesign method
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