PSI - Issue 71

Varsha Harne et al. / Procedia Structural Integrity 71 (2025) 279–286

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Fig. 5. Pushover curves for prototype’s 1, 2, and 3.

Fig. 6. Pushover curves for prototypes 4, 5, and 6.

4.2 Idea of Strong Columns-Weak Beams The pushover curves for prototypes 4, 5 and 6 are shown in Fig. 6. These curves were created utilising the strong columns-weak beams paradigm. It can be shown that in terms of base shear resistance, the infill wall frame has a higher maximum base shear force tolerance than the bare frame. As such, we find that the infill walls contribute about 50% to the resistance of the frame. However, this percentage is lower than the increase observed in the frames with the weaker columns. This is because strong columns provide a greater amount of shear resistance in frames. Similar to prototype 3, the efficiency of the inner wall above the first floor is rather low in prototype 6, which depicts the frame with a soft ground storey. Fig. 6 illustrates this, demonstrating that the shear resistance capacity is close to 1000 kN. But a significant finding from Fig. 6 is that the stiffness of prototype 6 is higher than that of the bare structure (prototype 4). 4.3 Comparison of outcomes in terms of Max Displacement

Fig. 7. Maximum displacement of analyzed structures with weak columns-strong beams.

Fig. 8. Maximum displacement of analyzed structures with strong columns-weak beams.

4.4 Comparison of outcomes in terms of Maximum Inter-Storey Drift Ratio The storey drift of prototype-5 (fully infilled frame) is 36.92% less compared to prototype-4 (bare frame) at the first floor level. Therefore, it can be said that reducing the storey drift at the basement level with an infill wall might be a suitable option.

Fig. 9. Storey Drift Values for Prototype No. 1, 2, and 3 with weak columns-strong beams.

Fig. 10. Storey Drift Values for Prototype No. 4, 5, and 6 with strong columns-weak beams.

4.6 Comparison of outcomes in terms of Location of Plastic Hinges formation One thing is evident when considering the quantity of hinges formed: infill guarantees minimal hinge formation. Comparing the soft storey prototype to the infill and bare frame prototype, there are more hinges produced.