Seismic performance of a novel partial precast RC shear wall with reserved cast-in-place base and wall edges

Parametric experimental investigation of unbonded post‐tensioned reinforced concrete bridge piers under cyclic loading

“…It is noteworthy that the following formulation assumes the PT bar to behave elastically, while the ED bars are assumed to be elastic perfectly plastic. The forces in the PT bar (F PT ) and ED bars in tension, identified by the subscript i (𝐹 𝑡 𝐸𝐷,𝑖 ), are given by the following Equations ( 5) and (6), respectively [see Figure 2(D)]:…”

“…where 𝑛 𝑡 𝐸𝐷 and 𝑛 𝑐 𝐸𝐷 are respectively the number of yielding ED bars in tension and compression, which needs to be identified for each θ value. Based on Equations ( 4), (6), and (10a), the rotation θ 3 , corresponding to the first yielding of the ED bars in tension, and the corresponding moment M 3 are given by:…”

“…Based on Equations ( 4), (6), and (13a), the rotation θ 5 , corresponding to the first yielding of the ED bars in compression under the reverse loading, and the corresponding moment M 5 is given by:…”

“…The anchorage length of ED bars (L ac ) inserted into the ducts [Criterion (5)] is defined according to the AASHTO provisions 1 as follows: where d ED is the diameter of the ED bars and f g is the compressive strength of high-strength grout. In addition, as shown in Figure 2(D), an unbonded length L u is deliberately designed in the ED bars at the pier-footing interface to avoid the stress concentration and premature bar fracture at this location due to repeated joint opening and closing [Criterion (6)].…”

“…5 In this context, there is an urgent societal need for innovative structural solutions that can effectively achieve seismic resilience, mitigating disruptions to the traveling public. 4,[6][7][8] A typology of resilient bridges is obtained using self-centering rocking piers, [8][9][10][11][12][13][14][15][16][17] where unbonded post-tensioned (PT) elements and energy dissipation (ED) components are combined within precast elements. The PT elements provide the self-centering capability, while the ED components aim to increase the structure's dissipation capacity.…”