Abstract
During the analysis of reinforced concrete structures, the infill wall is usually simplified as a diagonal inclined strut to facilitate finite element modeling calculations. However, the actual seismic damage and single frame-filled wall pushover experimental results show that when the earthquake shear force is huge, the top of the infill wall and the beam–column connections are usually, thus the path of the force transfer will be changed. Based on this actual failure phenomenon, a new calculation model which has different contact position between the equivalent bracing walls and the frame columns is generated. Thus, the force analysis is given based on this model, the formulae for calculating the equivalent width of bracing walls, the shear bearing capacity of the wall-filled frame, and the infill wall’s actual participation in the stiffness. A finite element simulation method by ABAQUS is used to determine an empirical formula for calculating the reasonable contact position between the equivalent bracing walls and the frame columns. The verification results show that the finite element model presented in this paper is more reasonable, and the stiffness and shear resistance of infill wall should not be neglected. The calculation formula of stiffness of infill wall presented in this paper is coincided with seismic code. But the calculation formula of shear resistance of infill wall presented in seismic code is higher than the actual value, so it is suggested that calculation formula presented in this paper should be accepted.
Highlights
Reinforced concrete frame filled wall structure is one of the most widely used structural forms in China
It should be noted that during ABAQUS finite element modeling, for the equivalent diagonal strut concentrated quality and the stiffness of equivalent bracing wall located in the center line of it, the contact position between the rod end and frame column was calculated according to Eq (16): s = Δx + 0.5αch
In the earthquake engineering area, simulations of wall-filled frame structures often use a macroscopic equivalent model based on certain hypotheses, where the infill wall is simplified as an equivalent diagonal strut
Summary
The concept of an equivalent diagonal strut was first proposed by Polyakov [2] based on experimental results, where he considered that the infill wall can be simplified as diagonal bracing walls with compression but no tension. According to earthquake damage in recent years, it is common that the brick masonry between the top of the infill wall and the corner of the beam–column joint is usually crushed under the local shear action (Fig. 1); in the ultimate bearing capacity conditions, the equivalent diagonal strut model of the rod end supported on the beam–column joint is not reasonable. Based on previous research into the infill wall status, as outlined above, this article focuses on the force analysis, and derives the formulae for calculating the stiffness, shear strength, and width of the equivalent bracing wall in the ultimate bearing capacity conditions, thereby providing a reference for seismic damage analysis and structure design. Using the finite element software ABAQUS, the single wall-filled frame component is simulated and used the formula to fit the results, thereby obtaining an empirical formula related to the reasonable contact position of the equivalent diagonal strut and frame column, and present a new equivalent diagonal single-strut bracing model of a wall-filled frame component
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