Evaluation of the behavior and ultimate capacity of unbonded monostrand-anchorage systems under concentric and eccentric inelastic cyclic loading Bedriñana L.A. es_PE Zhang K. es_PE Nishiyama M. es_PE 2024-05-30T23:13:38Z 2024-05-30T23:13:38Z 2018
dc.description The financial support of the Peruvian National Council of Science, Technology, and Technological Innovation (CONCYTEC/CIENCIACTIVA) for the doctoral studies of the first author is acknowledged. In addition, the authors would like to thank Sumitomo Steel Wire Corp. (SEI-SSW) for the generous donation of strands and anchorages for this test. The authors acknowledge the technical support of Mr. Masato Yamada and Mr. Katsuhito Oshima from SEI-SSW during the course of this research. Authors would like to thank the support of Tsuyoshi Takahashi, graduate student at Kyoto University, during the testing. All opinions, findings, and conclusions stated in this paper are those of the authors and do not necessarily reflect the views of the supporting institutions.
dc.description.abstract Unbonded post-tensioning (PT) monostrands have traditionally been used in buildings to sustain monotonic loads on members subjected mainly to gravity loads. As a result, most of the technical information on commercially available unbonded PT anchorage systems focused only on applications for gravity-loaded members. Despite the recent experimental research efforts on the behavior of PT anchorages under earthquake-simulated demands, this information has not been well quantified in design documentation. Consequently, further research is needed on unbonded PT anchorages for their use in members subjected to seismic loads. This paper presents the results of a comprehensive experimental evaluation on the ultimate capacity of monostrand anchorages subjected to high-amplitude concentric and eccentric cyclic loads. In addition, this paper addresses the influence of anchorage type, loading patterns and strand size on the ultimate deformation capacity of these anchorages. Specimens consisted of monostrands assembled with anchorages at both ends. Two types of anchorages were tested. Moreover, seven-wire, uncoated, low-relaxation PT monostrands in two sizes were considered. Several cyclic loading conditions were applied, in order to evaluate the behavior of anchorages under different scenarios. The ultimate capacity of the specimens was dominated by a premature fracture of one or few wires inside the wedges and two types of wire fractures were recognized: (1) with little reduction in the wire cross-sectional area and (2) with a notable reduction in the wire cross-sectional area prior the fracture. It was also observed that increased number of wire fractures correlated with larger strain capacity in some specimens. In addition, it was observed that eccentric loads reduced the strain capacity by about 18% for eccentricities of 6% in some cases. The fracture of the specimens occurred at relatively small strains, with values as low as 1.4%. Therefore, strains in unbonded post-tensioned strands should be limited to about 1.0% when designing for seismic loads. Furthermore, an analytical model was proposed to evaluate the influence of anchorages in unbonded post-tensioning precast structures.
dc.description.sponsorship Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - Concytec
dc.identifier.scopus 2-s2.0-85053814008
dc.language.iso eng
dc.publisher Elsevier Ltd
dc.relation.ispartof Engineering Structures
dc.rights info:eu-repo/semantics/openAccess
dc.subject Wire
dc.subject Anchorages (foundations) es_PE
dc.subject Cyclic loads es_PE
dc.subject Fracture es_PE
dc.subject Joints (structural components) es_PE
dc.subject Seismology es_PE
dc.subject Strain es_PE
dc.subject Eccentric loads es_PE
dc.subject Inelastic strain es_PE
dc.subject Monostrand es_PE
dc.subject Posttensioning es_PE
dc.subject Strain capacities es_PE
dc.subject Structural design es_PE
dc.subject cyclic loading es_PE
dc.subject elasticity es_PE
dc.subject seismic design es_PE
dc.subject seismic response es_PE
dc.subject strain analysis es_PE
dc.subject structural analysis es_PE
dc.subject structural component es_PE
dc.subject tension es_PE
dc.title Evaluation of the behavior and ultimate capacity of unbonded monostrand-anchorage systems under concentric and eccentric inelastic cyclic loading
dc.type info:eu-repo/semantics/article