Where can Strength Design (SD) or LRFD load combinations be found?

The correct reference for Strength Design (SD) or Load and Resistance Factor Design (LRFD) load combinations is indeed found in the IBC 1605.2. The International Building Code (IBC) provides detailed guidelines on load combinations that are used in structural design, specifically addressing the requirements for different types of loads such as dead loads, live loads, and environmental loads.

IBC 1605.2 specifically outlines the various load combinations that structural engineers must consider when designing structures to ensure safety and performance under various loading scenarios. This section is significant in the context of strength design and LRFD, as it informs engineers on how to appropriately combine the different loads during the analysis and design phases of a project.

The other options relate to different standards and sections that do not explicitly address LRFD load combinations. By focusing on IBC 1605.2, it becomes clear that this is the proper reference for engineers needing to implement these design philosophies in their work.