Research On Nonlinear Finite Element Models Of Multi-Ribbed Composite Slab Structure

Rapid development and application of prefabricated construction lead to huge economic benefit for the society and greatly reduce the pollution to the environment at the same time.It is a major change to the way of building.Multi-ribbed composite slab structure is made up of prefabricated multi-ribbed composite walls and field-cast connection components and slabs.The multi-ribbed composite wall is prefabricated by concrete frames with small cross section and little reinforcement ratio and embedded lightweight masonry.The connection components contain invisible frame columns and connection columns and hidden beams.This structure determines has diverse material composition and complex stress relations,which increase the difficulty to establish a reasonable and efficient numerical analysis model to predict its mechanical performance in the earthquake loading.Based on the common software ABAQUS,this article develops the uniaxial hysteresis constitutive models for concrete and steel.In addition,this article develops plane-stress model for concrete and masonry based on equivalent uniaxial strain theory.And finite element model of multi-ribbed composite slab structure is established for dynamic analysis by multi-layer shell element model.The main contents are as follows:(1)This article develops the uniaxial hysteresis constitutive models for concrete and steel based on ABAQUS platform and proposes the fiber model for multi-ribbed composite wall using BAC model.In this model,fiber model is used to simulate outer frame while BAC model is used to analysis embedded masonry.(2)Based on the equivalent uniaxial strain theory,plane-stress models for concrete and masonry are developed to simulate components under plane-stress condition.The results verify its accuracy and applicability.This article proposes a fiber-plane model for standard multi-ribbed composite wall.(3)The plane-stress model is integrated into multi-layer shell model to simulate the nonlinear behavior of filling masonry and the shear wall.A fiber-multi-layer shell element model of the multi-ribbed composite slab structure is proposed and analyzed.