Detection and prediction of seismic damage to a high-strength concrete moment resisting frame structure

This paper presents the background experimental and analytical research that was carried out to develop the provisions for the seismic design of high-strength concrete structures in the 2004 Canadian standard CSA A23.3–04. It is noted that the 1994 Canadian standard CSA A23.3–94 limited the concrete compressive strength to 55 MPa for the seismic design of nominally ductile and ductile structures, while the 1995 New Zealand Standard limited the concrete compressive strength to 70 MPa. In contrast, the 2008 American Concrete Institute (ACI) code ACI 318M has no upper limit on concrete strength, even for the seismic design of ductile structural elements. This tremendous variation in these limits indicated that more experimental evidence was needed. This paper presents experimental results of reversed cyclic loading tests on large-scale structural components as well as simulated seismic loading tests of a frame structure constructed with high-strength concrete. The goal of this collaborative research program at the University of Sherbrooke and McGill University was to determine the seismic design and detailing requirements for high-strength concrete structures to achieve the desired level of ductility and energy dissipation. The experimental programs include full-scale testing of the following: columns subjected to a pure axial load (square and circular columns); columns subjected to flexure and axial loads; beam-column subassemblages (square and circular columns); coupling beams in coupled wall structures; shear walls and a two-storey, three-dimensional frame structure. The results of the responses of the high-strength concrete structural specimens are compared with the responses of companion specimens constructed with normal-strength concrete.

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Seismic performance of prefabricated high-strength concrete tube column–steel beam joints

Advances in Structural Engineering ◽

10.1177/1369433217726895 ◽

2017 ◽

Vol 21 (5) ◽

pp. 658-674 ◽

Cited By ~ 4

Author(s):

Xizhi Zhang ◽

Jiawei Zhang ◽

Xuejian Gong ◽

Shaohua Zhang

Keyword(s):

Seismic Performance ◽

High Strength Concrete ◽

Failure Modes ◽

High Strength ◽

Frame Structure ◽

Steel Beam ◽

Seismic Region ◽

Strength Concrete ◽

Shear Connectors ◽

Cracking Pattern

This study proposes a new type of fabricated hybrid frame structure, which is a prefabricated high-strength concrete tube column–steel beam joint hybrid frame structure. A series of six full-scale cruciform prefabricated high-strength concrete tube column–H-shaped beam joint specimens was tested under cyclic loading to investigate the seismic performance of the new fabricated hybrid frame structure. We designed the connection in the manner that the capacity of beam was higher than that of the column. The cracking pattern, failure modes, energy dissipation capacity, and strain profiles of the specimens were obtained and discussed. The test results showed that some specimens collapsed due to ring plate tearing failure and weld fracture, while other specimens collapsed due to column flexural failure. Shear connectors (i.e. shear studs and shear reinforcement) could ensure the reliable transmission of shear force, and the compound stirrups can effectively improve bearing capacity and joint ductility. The stiffness degradation of specimens was smooth with a linearly decreasing trend because of the prestressed reinforcement. The new joints could be applied in a seismic region.

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