Influence of Lap Splices on the Deformation Capacity of RC Walls. II: Shell Element Simulation and Equivalent Uniaxial Model
| Autor: | Danilo Tarquini, João Saraiva Esteves Pacheco de Almeida, Katrin Beyer |
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| Předmět: |
Engineering
Shell element Constitutive equation 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology 0201 civil engineering Seismic effects Splice joint Lap splice General Materials Science Cyclic response Reinforcement Civil and Structural Engineering 021110 strategic defence & security studies business.industry Mechanical Engineering Reinforced concrete walls Building and Construction Structural engineering Reinforced concrete Finite element method Shear (geology) Equivalent uniaxial model Mechanics of Materials business |
| Popis: | Spliced longitudinal reinforcement may result in a reduction of both strength and displacement capacity of reinforced concrete (RC) members. This applies in particular when lap splices are located in regions where inelastic deformations concentrate, such as the plastic zone at the base of RC walls. This paper introduces a simple numerical model suitable for engineering practice to simulate the force-displacement response of RC walls with lap splices. Based on experimental data from 16 test units, an equivalent uniaxial steel stress-strain law is proposed that represents the monotonic envelope of the cyclic response of spliced rebars in RC walls up to the onset of strength degradation. It allows for modeling lap splice response with finite element (FE) models while avoiding the use of complex interface bond-slip elements. A new semi-empirical expression for the strain at the onset of strength degradation is derived, which expresses the strain capacity of the lap splice as a function of the confining reinforcement ratio and the ratio of lap splice length to shear span of the wall. The proposed equivalent constitutive law was included in shell element models to predict the force-displacement response of the test unit set of RC walls. Results demonstrated the ability of this approach to adequately capture the peak strength and displacement capacity of the spliced units. |
| Databáze: | OpenAIRE |
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