Abstract
The reinforced concrete (RC) frame with masonry infill wall is one of the most common structural systems in many countries. It has been widely recognized that the infill wall has significant effects on the seismic performance of RC frame structure. During the Wenchuan earthquake (China 2008), a lot of infilled RC frame structures suffered serious damages due to the detrimental effects brought about by the infill wall rigidly connected to the surrounding frame. In order to solve this problem, flexible connection, introduced by Chinese designers, is recommended by the updated Chinese seismic design code, because of its effect to reduce the unfavorable interaction between infill wall and frame. Although infilled RC frame structure with flexible connection has a lot of advantages, but because of the lack of research, this structure type is seldom used in practical engineering. Therefore, it is of great significance to scientifically investigate and analyze the effects of flexible connection on structure behaviors of infilled RC frame. In this study, a macrofinite element numerical simulation method for infilled RC frame with flexible connection was investigated. Firstly, the effects of connection between infill wall and surrounding frame on in‐plane behaviors of infilled RC frame were discussed. Secondly, based on deeply studying the equivalent diagonal strut models for infilled RC frame with rigid connection, an improved equivalent diagonal strut model for infilled RC frame with flexible connection was proposed. Employed with inversion analysis theory, the parameter in the proposed model was estimated through artificial fish swarm algorithm. Finally, applied with the existing experiment results, a case study was conducted to verify the effectiveness and feasibility of the proposed model.
Highlights
Introduction and Literature ReviewInfilled reinforced concrete (RC) frame structure is a commonly used structural system around the world
Infilled RC frame structure with flexible connection has a lot of advantages, but because of the lack of research, this structure type is seldom used in practical engineering. erefore, it is of great significance to scientifically investigate and analyze the effects of flexible connection on structure behaviors of infilled RC frame
According to the updated Chinese seismic design code [1], the flexible connection is recommended, because of its ability to reduce the unfavorable interaction between infill wall and surrounding frame as well as to improve the seismic performance of infilled RC frame structure [2]. erefore, it is of great significance to scientifically investigate and analyze the effects of flexible connection on behaviors of infilled RC frame
Summary
Infilled reinforced concrete (RC) frame structure is a commonly used structural system around the world. Tests results showed that the effects of infill wall on the strength, stiffness, and energy dissipation capacity of RC frame are significant. Zhou et al [24] proposed a microfinite element simulation method for infilled RC frame with flexible connection. With the deepening of research and complexity, some researchers took into account the local shear stresses transferred by the infill wall to the surrounding frame and proposed a series of multiple-strut macrofinite element models. Crisafulli and Carr [30] developed a multiple-strut macrofinite element model including classical truss elements and a special shear spring to simulate the influence of the vertical load on the overall strength of the infill wall (Figure 5(a)). A macrofinite element numerical simulation method for infilled RC frame with flexible connection was proposed.
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