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In structural analysis, utilizing computer software has become the standard approach due to its efficiency and accuracy. Computer software allows engineers to model complex structures and analyze them under a variety of loads and conditions that would be incredibly time-consuming, if not impossible, to assess through hand calculations. These programs can handle large sets of data and perform intricate calculations, leading to more reliable results.

Moreover, software such as finite element analysis (FEA) tools can simulate how structures will react under various stresses and loads, providing insights into potential failure points or necessary adjustments during the design phase. This enables engineers to optimize their designs for safety and cost-effectiveness.

The other methods listed, while valuable in certain contexts, do not offer the same level of precision or ease of use for complex structural analysis as computer software. Hand calculations are limited by the complexity of the structure, graphical methods may not provide the detailed quantitative analysis needed in engineering, and manual drafting is more related to the creation of technical drawings rather than analysis. Hence, computer software stands out as the most effective method for structural analysis in modern engineering practice.