Section 1 Calculation of internal forces of multi-span statically determinate beams 1. Definition: A beam formed by connecting several beams with hinges and supports is a multi-span statically determinate beam. 2. Types of beams Type I beam: Type II beam: Mixed beam: 3. Force hierarchy analysis Type I beam: The geometrically invariant part is the basic structure; the geometrically variable part is the subordinate structure. 4. Load transfer principle: The load on the subordinate structure must be transferred to the basic structure, that is, the load on the subordinate structure has an impact on the basic structure; the load on the basic structure is not transferred to the subordinate structure, that is, the load on the basic structure has no impact on the subordinate structure. 5. Calculation principle: Calculate the subordinate structure first; then calculate the basic structure.
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