The use of unbounded tendons is common in prestressed concrete structures and evaluation of the stress increase in unbonded tendons at ultimate flexural strength of such structure has posed a great challenge over the years. Based on the bending experiment for two-span continuous post-tension beams with unbounded tendons and externally applied CFRP sheets, the monitoring of the stress increment ...

This paper comprehensively studied the combined effects of prestress change and aspect ratios on nonlinear structural performances externally prestressed precast concrete segmental bridges (PCSB). An experimentally validated discrete-finite element model was adopted various analytical cases were generated with variable span lengths. Furthermore, a simulation study is performed considering in le...

In this study, hybrid nonlinear finite element models (FEM) were developed to examine the flexural performance and ultimate load capacity of bonded unbonded two-way reinforced concrete post-tensioned (PT) slabs that pre-strengthened with external carbon-fiber reinforcement polymer (CFRP) laminates. Full 3D simulations, using ANSYS models, have been created for five different slab samples select...

Modeling on restoring force characteristics of unbonded precast prestressed concrete beams with widened beam end was proposed in this paper. One model has rotational springs at both the outer general and end, another one spring a rigid zone end. Ten whose parameters are longitudinal rebar amount, size, prestressing force, etc., were constructed tested. The method captured test results good accu...

The performance of precast concrete frame structures against seismic loads mainly depends on the beam-to-column connection. A ductile hybrid connection consists unbonded post-tensioning steel and bonded reinforcement bars, both which provide overall moment resistance to frame. Post-tensioning acts as a restoring force brings structure back its initial position upon unloading. Mild an energy dis...