Ji Lu Investigation - Cross Section Analyses
Ji Lu Investigation - Cross Section Analyses |
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| Using UCFyber, a cross section
analysis tool, the moment curvatures, interactions, and capacity orbits
were run for the structural members of the Ji Lu bridge.
Under longitudinal loading the column is stronger than the beams suggesting flexural hinging in the main span prior to hinging in the pylon (Figure 1). Detailed selection analysis of the Main Span and the Pylon are available as UCFyber output.
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Figure 1 - Bending capacities from longitudinal loading |
| Loading in the transverse
direction, capacity of the deck is greatly affected by the presence of the
precast panels (wings).
The main pylon above the deck has much less capacity than that below (Figure 2). This matches observation in that damage was seen in the pylon above the deck, but not below.
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Figure 2 - Bending capacities from transverse loading |
| Loading in the transverse direction, the capacity of the columns at the P11/P13 pier supports are much stronger than the coupling beam (Figure 3). But, from the observed damage, we saw shear failure in the coupling beam. The shear capacity of the beam, per ACI 318, is 16.9 MN. This will be considered later in assessing actual loads on the pier frame. |
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Figure 3 - Bending capacities from transverse loading of the End Piers |
