Seismic performance and design of bridge column‐to‐pile shaft pipe‐pin connections in precast and cast‐in‐place bridges

Abstract

Summary Hinge or “pin” connections may be used in integral bridges to connect columns to pile shafts to reduce the foundation force demand. Used in combination with prefabricated columns, pins facilitate accelerated bridge construction (ABC). These innovative methods could improve the quality and economy of project compared with conventional construction in seismic regions. This study developed pipe pins that reduce moment transfer between the column and pile shaft under seismic excitations. The pipe pins consist of two steel pipes and a rod that transfer shear and tension while allowing rotation between the column and shaft. The primary objective of this research was to investigate the seismic performance and develop design guidelines of column‐to‐pile shaft pipe pins for cast‐in‐place and precast constructions. This research was composed of experimental and analytical studies. The experimental portion of the study consisted of testing of a large‐scale bent model subjected to seismic loadings. The test results confirmed that the proposed design method meets the safety and performance requirements of the codes under seismic loadings. The pins maintained structural integrity with minimal damage, while the columns reached the full plastic hinge capacity. The analytical studies consisted of (a) a simple stick model to be used as a design tool, (b) a finite element model (FEM) for global analysis of bridges, and (c) an elaborate FEM to investigate the microscopic performance and interaction of the components. The analytical models were subsequently used in parametric studies.

Precast bridge piers: Construction techniques, structural systems, and seismic response

“…These components include: external energy dissipation) ED) devices as shown in Figure 5(i), (j), and (k) (Andisheh et al, 2018; Chou and Chen, 2005; Marriotte et al, 2009; ElGawady and Sha’lan 2011; Marriotte et al, 2009), external ED devices with a pocket connection, in which the precast RC column is inserted into a pocket located in precast RC footing, as shown in Figure 5(d) (Currie et al, 2007), internal longitudinal ED bars, as shown in Figure 5(g) (Jia et al, 2020; Jia et al, 2022; Ou et al, 2010; Ou et al, 2018), internal ED bars and CIP grout, as shown in Figure 5(a) (White and Palermo, 2016), and internal ED bars with concrete/steel shear keys as shown in Figure 5(h) (Hung et al, 2017). In addition, Mehrsoroush and Saiidi (2016), Mehraein & Saiidi. (2019), and Mehrsoroush & Saiidi.…”

Enhanced Strategies for Seismic Resilient Posttensioned Reinforced Concrete Bridge Piers: Experimental Tests and Numerical Simulations

“…2(d)] was obtained by replacing the UHPC a mortar bed with ECC material. The ECC material was used because of its high damage tolerance and enhanced ductility, as discussed by Li and Zhang (2011) and Mehraein and Saiidi (2019). These advantages potentially contribute to the resistance to contact damage at the rocking surface.…”

Seismic Response and Nonlinear Mechanical Characteristics of Bridge Pile Foundation in Yushu Permafrost Area

“…(1) e soils used for this simulation analysis are the foundation pit soils of a station on the Yushu Expressway (Gongyu Expressway) in the plateau permafrost area. e length of the foundation pit is 234.7 m, the width of the standard section is 20.7 m, the buried depth of the bottom plate is about 17.74-19.25 m, and the buried depth of the Fushi is 3.9 m. e ground depth of the test soil sample is about 7-9 m. e soil sample taken from the foundation pit will be exposed to the sun, crushed, and screened, and a variety of soil samples will be selected as the frozen soil for the static and dynamic strength and dynamic parameter tests and the dynamic characteristics tests of the model pile foundation in the subsequent frozen soil environment [20][21][22][23][24][25][26].…”