| Title |
The Guideline of Axial Stress for Improving Seismic Performance of Tall Structural Walls using Ultra High-Strength Reinforced Concrete |
| Abstract |
The guideline of axial stress for ultra high-strength Reinforced Concrete(RC) tall walls are investgated by reviewing the author's test results and the open literature for appropriate experimental data. Based on the geometry of structures designd for protective purposes and concerns regarding their response during seismic loading, data are obtained from pertinent references for which the structural wall aspect ratio(1w/hw) is greater than and equal to approximately 1.0, and for which loading is cyclic in nature. In particular, deformability, at point in the softening region beyond ultimate for the load has dropped to 80 percent of its ultimate value, is obtained and converted to drift information.The primary objectives of this paper are to investgate the influence of the levels of applied axial stresses on the seismic performance of high-strength and ultra high-strength R/C structural walls andestablish the guideline of axial stress for high-strength and ultrahigh-strength R/C walls to insure aductile performance. Finally, brief comparisons of shear strength,drift limit and equivalent viscous damping ratio with existingseismic design code requrements are presented. Based on results of 60 tests of R/C walls, the guideline of axial stress for improving seismic performance of tall structural walls using high-strength and ultra high-strength R/C are recommended. |