Outdoor Test of a Prefabricated Column–Pile Cap–Pile System under Combined Vertical and Lateral Loads

Abstract

An outdoor test was conducted on a prefabricated column-pile cap-pile system at a cohesive soil site. The half-scale test unit consisted of a precast bridge column, a precast pile cap, and eight steel piles. The components were connected utilizing socket connections that were preformed in the pile cap with corrugated steel pipes. To evaluate the system performance and the behavior of various connections, the test unit was subjected to combined vertical and lateral loads at service conditions as well as at conditions representing extreme events. The test unit remained undamaged under the loads representing the service conditions, and a plastic hinge was formed in the column under loading conditions representing a seismic event. The column connection and pile connections exhibited excellent behavior as they maintained fixity with the formation of a column plastic hinge. The outdoor test demonstrated that up to 40% of column top displacement was produced by foundation flexibility at the service conditions. The description of the outdoor test and key results are included in this paper.

Bearing Performance of Prestressed High-Strength Concrete Pipe Pile Cap Connections under Truncated Pile Conditions

“…The main factors causing differences between the simulation results and the test results are as follows: (1) There are certain differences between the ontological relationships among the concrete, reinforcement and other components and between the actual stress-strain relationships, and the test process of the concrete under repeated loading continues to crack and close, and its strength continues to decline with further simulation. (2) There is a difference between the contact relationships between the concrete, steel reinforcement and other components and the actual contact. Reinforced components are built into the concrete, and the bond-slip effect of the reinforcement is neglected in the simulation.…”

“…The following authors have studied the load bearing performance of joints between columns/piles and caps through experiments. Zhao Cheng et al [2] studied prefabricated reinforced concrete columns without prestressing. Guangda Zhang et al [3] and Lenci Kappes et al [4] studied concrete-filled steel tube columns/piles.…”

Bearing Performance of Prestressed High-Strength Concrete Pipe Pile Cap Connections under Truncated Pile Conditions

“…The following authors have studied the load bearing performance of joints between columns/piles and caps through experiments. Cheng et al [2] studied prefabricated reinforced concrete columns without prestressing. Zhang et al [3] and Kappes et al [4] studied concrete-filled steel tube columns/piles.…”

Research on the Factors Influencing the Seismic Performance of Grouting Sleeve Assembled Double-Column Piers

“…The first damaged part during earthquakes is the part of the bridge pier connecting with the pier and the cover girder, and the damage mode is the ductile damage dominated by the bending damage. The seismic performance of prefabricated assembled piers is affected by the reinforcement rate, concrete strength, axial pressure ratio, pier aspect ratio, and other factors [10][11][12][13][14][15][16][17][18][19][20][21][22][23]. When a prefabricated assembled bridge uses a socket connection, the embedded depth of the socket structure is different, and the prefabricated precast assembled pier damage mode is not the same.…”