Salinas, Rafael

Evaluation of Seismic Responses of Building Systems With Self-Centering Concrete Structural Walls

Abstract eng:
Currently, the development of seismic design and construction procedures is oriented toward reducing damages in structures and in building equipment in response to various levels of earthquake intensity. Among the innovative strategies proposed to reduce damages in structures, the use of structural elements with precast concrete and self-centering walls has been proposed. A self-centering wall is defined as a reinforced concrete wall on a foundation with post-tensioned tendons fixed to the foundation and without a monolithic joint between the wall and the foundation. Some ductile steel bars are included at the base of the wall for energy dissipation and for the formation of a hybrid system. Behavior of precast walls with unbonded post-tensioned tendons has been studied by several authors by tests that showed some capabilities of systems with unbonded post-tensioned tendons, such as self-centering response and decreased residual displacements. This paper describes the results of shaking table tests of three five-story miniature buildings with dual (wall–frame) systems, designed with seismic design criteria similar to those used in conventional dual systems. Two tests units had selfcentering reinforced concrete structural walls, and one test unit had a conventional reinforced concrete structural wall. The self-centering walls were built with unbonded post-tensioning tendons and energy dissipators of ASTM A615 steel joining the wall base and the wall foundation. The tests showed that the test units with self-centering dual systems behaved in a manner similar to the test unit with the conventional dual system. In addition, an increase in the participation of the selfcentering structural walls in the total seismic response was observed to lead to an increase in overstrength and a decrease in residual drifts of the structure, as well as a decrease in residual deformations in critical sections of the frame elements.

Contributors:

Sanchez, Roque

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.