Single Spring Joint Element Based on the Mixed Coordinate System

Abstract

As a FEM for reinforced concrete bond-slip problems, one important feature of the typical double spring joint element method is the selection of the normal stiffness, which may cause the mutual embedding problem and bring challenges to the calculation. In this paper, a novel single spring joint element method based on the mixed coordinate system is proposed to simulate the interaction of two materials. Instead of choosing the normal stiffness arbitrarily, the proposed method makes DOFs of two materials in the normal direction equal to ensure deformation compatibility. And its solid elements for the concrete are solved in global coordinate system, while the beam elements for the steel bar are solved in local coordinate system. In addition, the proposed method can also be applied to RC structures with irregular arrangements of steel bars. Numerical examples demonstrate the validity and accuracy of the proposed approach. Furthermore, the bond model is applied to RC beams with the description of the damage process.

Improvement and Implementation of Calculation Method for Prestressed Concrete Cylinder Pipes

“…A large number of damage models for concrete may be found in [39,40]. Wei et al [41] presented a new fourparameter failure criterion in strain space based on the Hsieh-Ting-Chen four-parameter failure criterion.…”

“…Wei et al [41] presented a new fourparameter failure criterion in strain space based on the Hsieh-Ting-Chen four-parameter failure criterion. e new criterion can model the concrete strength precisely not only under uniaxial but also under multiaxial stresses; details can be found in [39,41]. In this paper, we adopted the new fourparameter failure criterion in strain space combined with the stress-strain curve from [2,38] as the concrete and mortar damage constitutive model to simulate damage.…”

“…In this study, we adopted the Dun-Chang E-B model for soil. e study by Zhao [39] presented a novel single spring joint element method based on mixed coordinate system and the traditional double spring element method, in which the di culty of choosing the normal sti ness coe cient was avoided. In this paper, we selected the single spring joint element to model the bond-slip interaction in RC structures.…”

Study on Bond-slip Behavior between Non-uniformly Corroded Reinforcement and Concrete

“…In the direct approach, a bonding unit is directly established for simulation purposes. For instance, Zhao et al incorporated springs within concrete units and steel bar units to simulate tangential interaction between steel bars and concrete [2] . In the indirect approach, bonding slip is simulated by modifying reinforcement constitutive methods.…”

Seismic Safety Review of Gravity Dam Based on Finite Element Method

“…In fact, the material mechanics method can calculate the stress component and principal stress at any point in the dam, and the calculation results are relatively accurate, but due to the influence of foundation deformation, the calculated internal force results of the lower part of the dam have a large error [3]. In recent years, with the rapid development of computer technology, finite element numerical simulation technology has been widely used in various fields [4][5][6][7][8][9][10][11][12][13][14], and many scholars began to use the finite element numerical simulation technology to analyze the seismic problems of gravity dams [15,16]. Therefore, it is necessary to adopt finite element numerical simulation technology to conduct seismic review study of gravity dams.…”