A PROPOSAL FOR CUMULATIVE DAMAGE EVALUATION METHOD FOR LONGEVITY LIFE STEEL BUILDINGS CONSIDERING PLURAL STRONG GROUND MOTIONS

We used the Green’s function summation method together with the randomly perturbed asperity sources to sum up broadband statistical Green’s functions of a moderate-size source and predict strong ground motions due to the expected M8.1 to 8.7 Nankai-Trough earthquakes along the southern coast of western Japan. We successfully simulated seismic intensity distributions similar to the past earthquakes and strong ground motions similar to the empirical attenuation relations of peak ground acceleration and velocity. Using these results, we predicted building damage by non-linear response analyses and find that at the regions close to the source, as well as regions with relatively thick, soft sediments such as the shoreline and alluvium valleys along the rivers, there is a possibility of severe damage regardless of the types of buildings. Moreover, the predicted damage ratios for buildings built before 1981 are much higher than those built after because of the significant code modifications in 1981. We also find that the damage ratio is highest for steel buildings, followed by wooden houses, and then reinforced concrete buildings.

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Influence of P-Delta Effect on Ductility and Vulnerability of SMRF Steel Buildings

The Open Civil Engineering Journal ◽

10.2174/1874149501509010351 ◽

2015 ◽

Vol 9 (1) ◽

pp. 351-362 ◽

Cited By ~ 1

Author(s):

Juan Carlos Vielma Pérez ◽

Manuel Antonio Cando Loachamín

Keyword(s):

Seismic Behavior ◽

Ground Motions ◽

Steel Frames ◽

Order Effect ◽

Second Order ◽

Steel Buildings ◽

Strong Ground Motions ◽

Earthquake Resistant ◽

Moment Resisting ◽

Strong Ground

Current earthquake-resistant procedures prescribe generic values for the response reductions factors, regardless of the configurational characteristics of the designed buildings. It is well know that these response reduction factors values reflect the expected behavior of the structures when they are under strong ground motions, being this seismic behavior usually evaluated through ductility and over-strength. In this work calculated values of the ductility of special moment-resisting steel frames with different span lengths and designed according the Ecuadorian Construction Code are presented. Results show that the buildings’ ductility is strongly influenced by the spans length and they would reach inadequate values if the second-order effect P-Δ occur, and then indicating that the structures are more vulnerable than structures not affected by P-Δ effect.

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Seismic Performance of Ductile Steel Moment-Resisting Frames Subjected to Multiple Strong Ground Motions

Earthquake Spectra ◽

10.1193/111217eqs235m ◽

2019 ◽

Vol 35 (1) ◽

pp. 289-310 ◽

Cited By ~ 3

Author(s):

Randy Tenderan ◽

Takanori Ishida ◽

Yu Jiao ◽

Satoshi Yamada

Keyword(s):

Ductile Fracture ◽

Ground Motion ◽

Seismic Performance ◽

Ground Motions ◽

Cumulative Damage ◽

Response Analysis ◽

Steel Moment Resisting Frames ◽

Strong Ground Motions ◽

Moment Resisting ◽

Strong Ground

This study evaluates the seismic performance of steel moment-resisting frames (SMRFs) under multiple strong ground motions. The cumulative damage of beam members is used as the main damage index. A cumulative damage formula is generated based on the experimental results of the steel beam-to-column connection test considering the ductile fracture. Local buckling of members is not considered in this study. Six SMRF models with two parameters (the number of stories and the strength of the column base) are analyzed by conducting an inelastic response analysis. Three different ground motion intensities (peak ground velocity = 0.5 m/s (design level), 0.75 m/s, and 1.0 m/s), each with five repeated excitations are used in the inelastic response analysis to simulate the occurrence of multiple strong ground motions. Stable behavior with a linear increment in cumulative damage is found in most cases, especially when the ground motion intensity is equal to the design level. However, when the intensity is greater than the design level, both ductile fracture and weak story collapse are observed in several cases.

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