Disadvantages Of Macro Model

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1.1.1. Parameters depending These models depends on the • Aspect ratio of the frame • Number of struts • Width of the wall • Binding glue 1.1.2. Advantages Macro-models are applicable when the structure is composed of solid walls with sufficiently large dimensions so that the stresses across or along a macro-length will be essentially uniform. Macro-modelling is more practice oriented due to its reduced time, memory demands and as well as a user-friendly mesh generation. This type of modelling is most valuable when a compromise between accuracy and efficiency is needed macro models exhibit advantages in computational simplicity and efficiency.(2) 1.1.3. Disadvantages The main uncertainty of these macro models are the area (width) of struts…show more content…
The interface conditions such as slip, separation and frictional loss at the contact surface were considered using the link element. They were achieved by adjusting the axial, shear and tension force in the link element. The opening was modelled by assigning small values of infill thickness and Young’s modulus of elasticity of infill, but high value of Poison’s ratio. It was reported that the lateral stiffness of the structure decreases with the increases in opening size. The principal stresses were maximum at the corners of opening and the at compression ends. However, the author acknowledged that the equivalent diagonal strut mechanism may not be applicable for structures having an…show more content…
Micro-level concept also enables accurate modelling of ordinary infill, infill with openings, non-strengthened infill, strengthened infill and other different types of infill. Based on developed computer program and successful theoretical results, it has been expected that this modelling concept will be widely adopted in modern earthquake engineering.(8) 1.1.4. Disadvantages Micro models are particularly suited for small structures and involve rigorous calculations, whereas macro level model saves times and uses less memory too.(8) 1.1.5. Other Developments The Structural interaction between the infill and frame leading to a variety of modes of failure has been investigated by numerous researchers including Mehrabi 1994, Angel 1994 and Crisafulli 1997. Although some seismic design codes consider the interaction between the infill and frame (Hemant et al. 2006, FEMA 306), but in actual design practices such Structural interaction is usually ignored. The damage to the buildings after the Wenchuan Earthquake can be partly attributed to such ignorance in design and partly to the low Quality of

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