Statically Indeterminate Structures Perform Better during Earthquake

Statically determinate and indeterminate structures are two types of structures based on their ability to resist external loads. In the case of an earthquake, the performance of a structure depends on its ability to withstand the lateral forces caused by the seismic waves. Therefore, it is important to understand which type of structure performs better during an earthquake.

Statically Determinate Structures

A statically determinate structure is a structure in which the forces acting on the structure can be determined using the laws of statics. These structures have a fixed number of unknown forces that can be solved using equations of equilibrium. Examples of statically determinate structures include trusses, beams, and frames.

During an earthquake, statically determinate structures may experience large displacements and deformations due to their inability to redistribute the loads caused by seismic waves. This can result in the failure of the structure, causing damage to life and property.

Statically Indeterminate Structures

A statically indeterminate structure is a structure in which the number of unknown forces is greater than the number of equations of equilibrium available to solve them. These structures are designed to redistribute the loads caused by external forces, making them more resilient to lateral loads caused by seismic waves. Examples of statically indeterminate structures include arches, cable-stayed bridges, and suspension bridges.

During an earthquake, statically indeterminate structures are able to redistribute the loads caused by seismic waves, resulting in smaller displacements and deformations. This makes them more resilient to earthquakes and less likely to fail, reducing the risk of damage to life and property.

Conclusion

In conclusion, statically indeterminate structures perform better during earthquakes due to their ability to redistribute the loads caused by seismic waves. This makes them more resilient to lateral loads, resulting in smaller displacements and deformations and reducing the risk of failure. Therefore, it is important to consider the type of structure when designing buildings in earthquake-prone areas to ensure the safety of life and property.