Which building shapes may have unequal resistance to earthquakes?

The selected answer highlights that 'L,' 'T,' 'H,' 'U,' or 'E' shaped structures may have unequal resistance to earthquakes due to their geometric complexities and the varying distribution of mass and rigidity in different directions. These shapes often have irregular mass distribution and can create torsional effects during seismic events, leading to differential movement. The complexity of these forms can result in areas of stress concentration, making some parts of the building more susceptible to damage compared to others.

In contrast, simpler geometric shapes such as squares and circles, or even rectangles and triangles, tend to have more uniform mass distribution and symmetrical properties. These characteristics often lead to a more balanced response to seismic forces. Additionally, flat-roofed structures, while potentially having other design considerations related to seismic performance, do not inherently indicate unequal resistance due to shape alone; their response depends more on structural systems and materials used rather than their roof design alone.

Understanding that structural forms can significantly affect seismic performance is crucial for architects in designing buildings to withstand earthquakes effectively.