Abstract
This study compares analysis and design of a four story reinforced concrete (RC) frame structure with infill wall at upper levels and open at basement level. For the analysis, the RC frame are modeled as open frame (MOF) and infilled-frames using six compression only cross diagonal strut (MIF-Strut), and infilled frame using shell elements (MIF-Shell). Another model, MIF-Full, is created by adding walls at basement level of the MIF-Strut to study the effect of wall discontinuity. All three dimensional models are loaded with gravity load and quake load appropriate for South Bali region. Results show that the infilled-frame models are 4.8 times stiffer than MOF in the wall direction. Perpendicular to the wall, however, the stiffness increase is 29%. Soft storey mechanism exists in the absence of wall at basement level, regardless of reasonable column dimensions.
Highlights
In hotel or apartment of low rise buildings, many reinforced concrete (RC) frame structures are constructed with walls between rooms
In the wall direction, deformation of top floor of modeled as open frame (MOF) is more than 4.8 times larger than those of MIFs
Modeling of RC frame with infill wall as open frame (MOF) and infilled-frame (MIF) has lead to the following conclusions: 1. The infilled-frame models are more than 4.8 times stiffer than the open frame model when the lateral load is applied in the direction of the wall
Summary
In hotel or apartment of low rise buildings, many reinforced concrete (RC) frame structures are constructed with walls between rooms. The walls are usually made of solid brick or concrete block to prevent noise coming from the neighboring rooms. The existence of the wall, is usually considered nonstructural in design because the method of analysis is not simple and not yet readily available in building codes. This is surprising as investigations on the interaction between infill panel and the frame structures has begun since 1950s [1,2]. In Indonesia, there is an old code that cover infill wall in RC structures design [3]. There are so many restriction and conditions in the code that prevent inclusions of the wall in frame analysis and design, while many reports suggest the importance of including wall in frame analysis
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