Reinforced concrete bridge > Component 1
Materials 

The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 16 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 28 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 133 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 7 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 28 days.


The concrete had a 3/8 in (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28 day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in (150 x 300 mm) cylinder compressive strength was measured at 103 days (the end of the shake table tests). Only this set of column cylinders was tested at the time of the shake table experiments because the duration of testing was relatively short compared to the life of the concrete. Strength of the column concrete was most important because of its effect on bridge stiffness and strength.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 9 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 28 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 116 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 9 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 28 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 83 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 11 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 28 days.


The concrete had a 3/8 in. (9.5 mm) maximum aggregate size and was rated for an unconfined compressive strength of 5000 psi (34.5 MPa). Concrete was ordered with a specified 28day compressive strength of 5000 psi (34.5 MPa), expecting a cured strength ranging from 4500 psi (31.0 MPa) to 6000 psi (41.4 MPa) from past experience with the supplier. The small aggregate size was required because of reinforcement congestion and small cover that was a result of scaling. Standard 6 x 12 in. (150 x 300 mm) cylinder compressive strength was measured at 83 days.


Tensile testing was conducted for the lateral W2.9 spiral wire reinforcement in the columns. The W2.9 wire used in the columns was the same batch of Bright Basic wire that was used in both the quarterscale insitu twocolumn bent tests at University of Texas, Austin, and the quarterscale column component tests at Purdue University. Attached figures show the measured stressstrain curves for two of the wire tests. Yield stress for all reinforcement tests was determined using the 0.2 percent offset method. The average measured yield stress of the wire was 67 ksi (462 MPa) and the average ultimate stress was 80 ksi (552 MPa). The measured elastic modulus was approximately 27600 ksi (190000 MPa). Prior to the results shown in the figures, another set of wire tests was conducted. It was determined from those tests that accurate strain could not be measured by using the frame displacement of the test machine because of a slight curvature in the wire. For the stressstrain curves shown in the figure, the strain was measured as the average strain of two strain gauges that were placed on opposite sides of the wire. The average of the data from the two opposite gauges excluded bending strains.


Tensile testing was conducted for the longitudinal #3 bar reinforcement in the columns. Grade 60 bar was used throughout the bridge model. Tensile test results for the #3 rebar are shown in the attached figures. Figures 1 through 3 show the stressstrain curves for three tests that were conducted. Figure 4 shows the average of the three measured curves. The average stressstrain curve was calculated by averaging each of the measured stressstrain points along the three measured curves. For the preyield portion of the curve, the elastic modulus was assumed to be 29000 ksi (200000 MPa). The average yield and ultimate strength for the #3 bar was 66.5 ksi (459 MPa) and 97 ksi (669 MPa), respectively. It can be seen in the curves that there was not a yield plateau for the column reinforcement.
