City Block Resilience Lab: Load Paths, Progressive Collapse and Rescue Voids

What City Block Resilience Lab Is

The City Block Resilience Lab is a sophisticated tool for understanding how different structural systems behave when subjected to specific types of localized damage. By removing or altering individual components, such as columns, footings, and steel compartments, the lab allows users to observe the load redistribution patterns and potential collapse mechanisms in various building structures.

This simulation provides insights into the behavior of tied and precast reinforced concrete (RC) frames, soft-storey RC frames, steel frames, and brick buildings. Each structure type has unique characteristics that influence its response to damage, making this lab a valuable resource for civil engineers and architects.

Why It Matters

Understanding the load paths and progressive collapse mechanisms in city blocks is crucial for designing resilient buildings and infrastructure. By simulating various scenarios, the lab helps identify critical components that, if damaged, can lead to catastrophic failure. This knowledge is essential for enhancing building codes and improving emergency response strategies.

Moreover, the rescue-oriented overlay feature allows first responders to plan more effectively by identifying accessible voids and potential routes through rubble, ensuring safer and more efficient rescue operations.

Key Concepts

The simulation employs rigid-body-spring connections with plastic hinges and ties to model the behavior of structures under load. These models account for Euler buckling, steel strength as a function of temperature (k_y(T)), and floor-by-floor collapse mechanisms. The dynamic amplification factor is measured against the spring-mass value of 2, providing a realistic assessment of structural performance.

Damage grades ranging from D1 to D5 are used to quantify the extent of damage in each structure type, with rubble bulking calculations determining the volume of debris after collapse.

Real-World Applications

The insights gained from this simulation can be applied to real-world scenarios such as earthquake-resistant design and post-disaster assessment. Engineers can use these findings to improve building codes, ensuring that new constructions are better equipped to withstand localized damage. Additionally, the rescue-oriented overlay feature aids in developing effective emergency response plans for urban areas.

By understanding how different structures respond to various types of damage, city planners and architects can design more resilient communities, reducing the risk of catastrophic failure during natural disasters or other emergencies.

Frequently asked questions

Try it live

Everything above runs in your browser — open City Block Resilience Lab: Load Paths, Progressive Collapse and Rescue Voids and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.