Structural Continuity
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1 Architecture 324 Structures II Structural Continuity Continuity in Beams Deflection Method Slope Method Three-Moment Theorem Millennium Bridge, London Foster and Partners + Arup Photo by Ryan Donaghy University of Michigan, TCAUP Structures II Slide 1/25 Continuous Beams Continuous over one or more supports Most common in monolithic concrete Steel: continuous or with moment connections Wood: as continuous beams, e.g. long Glulam spans Statically indeterminate Cannot be solved by the three equations of statics alone Internal forces (shear & moment) as well as reactions are effected by movement or settlement of the supports University of Michigan, TCAUP Structures II Slide 2/25
2 Deflection Method Two continuous spans Symmetric Load and Geometry Procedure: 1. Remove the center support. 2. Calculate the center deflection for each load case as a simple span. 3. Remove the applied loads and replace the center support. Set the deflection equation for this case (center point load) equal to the deflection from step Solve the resulting equation for the center reaction force. (upward point load) 5. Calculate the remaining two end reactions. 6. Draw shear and moment diagrams as usual. University of Michigan, TCAUP Structures II Slide 3/25 Deflection Method Example: Replace redundant center reaction with an upward point load, bringing deflection at that reaction to zero. University of Michigan, TCAUP Structures II Slide 4/25
3 Deflection Method Write deflection equations for each load case. University of Michigan, TCAUP Structures II Slide 5/25 Deflection Method - Example Write deflection equations and solve for middle reaction. Solve remaining reactions by summation of forces. University of Michigan, TCAUP Structures II Slide 6/25
4 Deflection Method - Example cont.: Complete the shear and moment diagrams. University of Michigan, TCAUP Structures II Slide 7/25 Slope Method Two continuous spans Non-Symmetric Load and Geometry Procedure: 1. Break the beam into two halves at the interior support. 2. Calculate the interior slopes of the two simple spans. 3. Use the Slope Equation to solve for the negative interior moment. 4. Find the reactions of each of the simple spans plus the M/L reactions caused by the interior moment. 5. Add all the reactions by superposition. 6. Draw the shear and moment diagrams as usual. University of Michigan, TCAUP Structures II Slide 8/25
5 Slope Method Write equations for slope University of Michigan, TCAUP Structures II Slide 9/25 Example of Slope Method: Use slope formula to solve interior moment. University of Michigan, TCAUP Structures II Slide 10/25
6 Example of Slope Method cont.: Solve the end reactions by superposition of FBD s University of Michigan, TCAUP Structures II Slide 11/25 Example of Slope Method cont.: Construct load, shear and moment diagrams. University of Michigan, TCAUP Structures II Slide 12/25
7 3-Moment Theorem Any number of continuous spans Non-Symmetric Load and Geometry University of Michigan, TCAUP Structures II Slide 13/25 Three-Moment Theorem Any number of spans Symmetric or non-symmetric Procedure: 1. Draw a free body diagram of the first two spans. 2. Label the spans L1 and L2 and the supports (or free end) A, B and C as show. 3. Use the Three-Moment equation to solve for each unknown moment, either as a value or as an equation. University of Michigan, TCAUP Structures II Slide 14/25
8 Three-Moment Theorem (cont.) Procedure: 4. Move one span further and repeat the procedure. 5. In a 3 span beam, the mid-moment from step 3 above (B), can now be solved using the two equations from step 4 and 3 together, by writing 2 equations with 2 unknowns. 6. Repeat as needed, always moving one span to the right and writing a new set of moment equations. 7. Solve 2 simultaneous equations for 3 spans, or 3 equations for more than 3 spans, to get the interior moments. 8. Once all interior moments are known, solve for reactions using free body diagrams of individual spans. 9. Draw shear and moment diagrams as usual. This will also serve as a check for the moment values. University of Michigan, TCAUP Structures II Slide 15/25 Three-Moment Theorem Example University of Michigan, TCAUP Structures II Slide 16/25
9 Slope Equations University of Michigan, TCAUP Structures II Slide 17/25 Three-Moment Theorem Example (cont.) University of Michigan, TCAUP Structures II Slide 18/25
10 Three-Moment Theorem Example (cont.) Sign convention University of Michigan, TCAUP Structures II Slide 19/25 Three-Moment Theorem Example (cont.) University of Michigan, TCAUP Structures II Slide 20/25
11 Three-Moment Theorem 2 Spans University of Michigan, TCAUP Structures II Slide 21/25 Three-Moment Theorem 3 Spans University of Michigan, TCAUP Structures II Slide 22/25
12 2-Hinge Frame Statically indeterminate Find moment at knee Symmetric case solution University of Michigan, TCAUP Structures II Slide 23/25 2-Hinge Frame example Symmetric case solution Vertical reactions by symmetry Find moment at knee With FBD of one leg find H University of Michigan, TCAUP Structures II Slide 24/25
13 3-Hinge Frame comparison Statically determinate Solve with statics FBD of half from hinge Solve for H Use FBD of leg to solve M University of Michigan, TCAUP Structures II Slide 25/25 Comparison of moments 2-hinge frame 3-hinge frame University of Michigan, TCAUP Structures II Slide 26/25
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