Dynamic Analyses on Long-term Behavior of Composite Steel-concrete Beams with Weak Interface
The dynamic response of steel-concrete composite beams applied to long-term load is affected by the creep of concrete.In order to study the dynamic behavior of partial interaction composite beams under the coupling of dynamic and concrete creep factors,appropriate state variables are selected to establish the state space formula to de-rive the frequency characteristic equations and the corresponding mode shapes of free vibration under simply-support-ed boundary conditions at both ends.The formula is derived from basic mechanical differential equations considering the stress balance and strain compatibility at each joint by using the D'Alembert principle.Besides,an additional coeffi-cient considering the effect of concrete creep is added.And the mode superposition method is used to calculate the non-homogeneous equation solution and dynamic response of partial-interaction composite beams subjected to a uni-formly distributed harmonic load and a moving constant force.Regardless of the type of load,the numerical model can be applied successfully in simulating the time-dependent structural behavior of multi-span continuous beams.Fi-nally,the validity of the numerical model is verified by comparing the analytical results with the numerical ones and some related parameters studies.
steel-concrete composite beamcreepstate space methodmodal superposition methodsliding stiffness
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维普
