Infill wallswith functions such as the enclosing the building, dividing a large into several small placesthe architectural point of view and providing weather protection for the inside of the buildingare always found in real building. However, in the typical building design, they are always treated as non-structural elements and neglected in the design process.
In this preliminary study, the effect of RC infill wallon the seismic responses of building was investigated using 2D and 3D single-story frames. The linear analysis was conducted to minimize the factor involved and to avoid the interaction of nonlinear behavior of RC infill wall and frame member. The MIDAS-gen program was adopted for the analysis.
In this study, the effect of location and area of holes in the wall were examined using 2D single-story frames. The effects of layout of infill walls were investigated using symmetric and asymmetric 3D single-story frames. The use of RC infill wall in 2D and 3D single-story frame can increase the natural frequency as compared with pure-frame model; however the natural frequencies were also affected by the location of hole in the infill wall, and if an extra span with full wall is added, such effect is reduced. Comparison of natural frequency between 2D and 3D frame with and without RC infill wall shows that the frequency in 2D frame is higher than 3D frame; it indicates that 3D frame is more realistic for modeling. In 2D frame the inclusion of infill wall will increase the axial force at column support, while the trend of axial force in 3D-frame is reversed. From the investigation on 3Dsymmetric frame with RC infill wall, it is better to have the walls on both sides of the column to have better reduction in internal forces. On the other hand, the use of RC infill wall at 3Dasymmetric frame can lead to the reduction in the internal force, however the removal of some RC infill walls may lead to the increase in the internal force which maybe become even larger than those of pure frame especially for axial and shear force. Thus, from this studyit is recommended that to study theeffect of RC infill wallon the seismic responses of building 3D model is more realistic.
Keyword: RC infill wall, hole in the wall, MIDAS-Gen, 2D and 3D single-story frames, natural frequency, internal force; 摘要
Keyword: 鋼筋填充牆, 填充牆開孔, MIDAS-Gen, 2D and 3D 單層構架, 自然振動頻率，構件內力