RC Building Damage Statistics and SDF Response with Design Seismic Forces

1999 ◽  
Vol 15 (3) ◽  
pp. 485-501 ◽  
Author(s):  
Shunsuke Otani
Keyword(s):  
Nonlinear Response ◽  
Response Analysis ◽  
Single Degree Of Freedom ◽  
Damage Survey ◽  
Ductility Demand ◽  
Kobe Earthquake ◽  
Lateral Resistance ◽  
Rc Building ◽  
Mexico Earthquake ◽  
Seismic Forces

This paper introduces the damage statistics of reinforced concrete buildings after the 1985 Mexico earthquake, the 1990 Ruzon (Philippines) earthquake, the 1992 Erzincan (Turkey) earthquake, and the 1995 Hyogo-ken Nanbu (Kobe) earthquake. These data were obtained in severely damaged areas in each earthquake through the inventory damage investigation of the Architectural Institute of Japan teams. The damage statistics indicated severer damage in taller buildings and significantly less damage in low-rise buildings. A series of nonlinear single-degree-of-freedom systems having minimum code required lateral resistance were analyzed using the earthquake motions recorded near the area of damage survey. Contrary to the statistics, the nonlinear response analysis results showed higher ductility demand (damage) in lower buildings.

The Mexico Earthquake of September 19, 1985—The Seismic Performance of Buildings with Weak First Storey

1989 ◽  
Vol 5 (1) ◽  
pp. 89-102 ◽  
Author(s):  
S. E. Ruiz ◽  
R. Diederich
Keyword(s):  
Mexico City ◽  
Soft Soil ◽  
Absorption Capacity ◽  
Ductility Demand ◽  
Displacement Ductility ◽  
Lateral Resistance ◽  
Lateral Strength ◽  
Mexico Earthquake ◽  
Range Of Values ◽  
Acceleration Record

During the Michoacan earthquake of Séptember 19, 1985, 8 percent of the damaged buildings in the Mexico City area were characterized by a first storey much weaker than the upper ones. Although it is recognized that these failures may have resulted from the combination of several features, in this paper it is intended to study the possible influence of the lateral strength discontinuity in the ductility demand at the first storey, and to try to understand the behaviour of this type of structures under the actions of the East-West component of the highest acceleration record obtained on soft soil in Mexico City during the mentioned earthquake. A parametric study for five and twelve-storey buildings with weak first storey is presented in this paper. The infill walls in the upper storeys were brittle in some cases and ductile in others. For certain cases, the results show the existence of a range of values of the ratio of seismic lateral resistance of the upper storeys to that of the lowest one for which ductility demands at the lowest story can be considerably higher than for other intervals. It is shown that the absorption capacity of ductile walls plays an important role in the displacement ductility demands of the first storey.

scholarly journals Stochastic Response of Tension Leg Platform to Wave and Current Forces

1989 ◽  
Vol 111 (4) ◽  
pp. 221-230 ◽  
Author(s):  
A. Ertas ◽  
J.-H. Lee
Keyword(s):  
Constant Current ◽  
Response Analysis ◽  
Stochastic Dynamic ◽  
Superposition Method ◽  
Random Waves ◽  
Stochastic Response ◽  
Tension Leg Platform ◽  
Single Degree Of Freedom ◽  
Simulation Techniques ◽  
Wave Induced

The linear analysis in the frequency domain is presented for the surge motion of a tension leg platform (TLP) in the case of random waves only and random waves with constant current. A single-degree-of-freedom model of a TLP is employed for response. The superposition method, one of the simulation techniques, is applied to random sea wave, and the response analysis of TLP in time is developed with wave velocity and wave acceleration simulations. Wave-induced forces are calculated using the modified Morison equation, which takes into account relative motion. Computational methods for both analyses are developed, and the results of stochastic, dynamic response of the TLP, with and without the presence of current, are presented and compared.

Effect of the orientation of records on displacement ductility demand

2012 ◽  
Vol 39 (4) ◽  
pp. 362-373 ◽  
Author(s):  
A.D. García-Soto ◽  
H.P. Hong ◽  
R. Gómez
Keyword(s):  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Ductility Demand ◽  
Displacement Ductility ◽  
Single Degree ◽  
Perfectly Plastic ◽  
Principal Axes ◽  
Hazard And Risk ◽  
Elastic Perfectly Plastic ◽  
Pseudo Spectral

Effects of the ground motion record orientation on the estimated pseudo-spectral acceleration (PSA) have been investigated and reported in the literature; the statistics of the PSA along the major and minor principal axes differ from that for a random orientation. This is true for California as well as for Mexican records. However, a statistical assessment of the effect of record orientation on the displacement ductility demand is lacking. Such an assessment could be important for gaining confidence in and understanding of using the ductility demand rules for seismic hazard and risk evaluations. The statistical analyses of the effect of orientation on the estimated displacement ductility demand for elastic-perfectly-plastic and bilinear hysteretic (single degree of freedom) systems is carried out in the present study using sets of records from Mexican inslab and interplate earthquakes, and California earthquakes. Based on the obtained statistics, it is suggested that the consideration that the ductility demand is independent of the orientation of the records can be adequate, especially for Tn greater than 0.3 s and elastic-perfectly-plastic hysteretic single degree of freedom systems.

Performance-Based Design Approach for Seismic Rehabilitation of Buildings with Displacement-Dependent Dissipators

2001 ◽  
Vol 17 (3) ◽  
pp. 531-548 ◽  
Author(s):  
Sonia E. Ruiz ◽  
Hiram Badillo
Keyword(s):  
Time History ◽  
Seismic Intensity ◽  
Seismic Retrofitting ◽  
Performance Based Design ◽  
Preliminary Design ◽  
Single Degree Of Freedom ◽  
Ductility Demand ◽  
Seismic Rehabilitation ◽  
Structural Responses ◽  
History Approach

A performance-based approach for seismic retrofitting of buildings with energy dissipating devices is presented. The approach may be seen as an algorithm useful for converging to a preliminary design of a system to be analyzed according to the time history approach recommended in the NEHRP Guidelines for the Seismic Rehabilitation of Buildings (FEMA 273). The algorithm is based on the analysis of equivalent single-degree-of-freedom models with added parallel elements that represent the dissipating devices. The combined systems are analyzed under sets of accelerograms associated with different return intervals. The acceptance criteria are intended to control the peak drift of the rehabilitated structure and the maximum ductility demand of the dissipating devices. It is required that these maximum structural responses, for a given seismic intensity, be equal to or smaller than those associated with a given probability of exceedance. The approach is successfully applied to a ten-story, three-bay frame rehabilitated with U-shaped steel dissipators.

The Use of ARMA Models in Earthquake Response Spectra

2006 ◽  
Author(s):  
Malek Brahimi ◽  
Sidi Berri
Keyword(s):  
Linear Response ◽  
Energy Demand ◽  
Arma Model ◽  
Response Spectra ◽  
Response Analysis ◽  
Arma Models ◽  
Maximum Displacement ◽  
Ductility Demand ◽  
Displacement Ductility ◽  
Hysteretic Energy

Structural design spectra are based on smoothed linear response spectra obtained from different events scaled by their peak values. Such an approach does not incorporate other characteristics of the excitation represented by measured data. This study investigate the use of non-stationary models which can be considered characteristic and representative of specific historical earthquakes. An earthquake record is regarded as a sample realization from a population of such samples, which could have been generated by the stochastic process characterized by an Autoregressive Moving Average (ARMA) model. ARMA models are developed for four major earthquakes after processing by a variance stabilizing transformation. Samples of acceleration records are generated for each event. In this earthquake modeling procedure, parameters describing the modulating function of the record and the stabilized series are estimated. Maximum displacement ductility demand and normalized hysteretic energy demand for linear and stiffness softening single degree of freedom system systems are computed for the samples generated for each event. The sensitivity and dependence of demand spectra on earthquake model characteristics are examined to develop a response prediction model. Non linear response analysis of the four events indicates that ARMA (2,1) process using samples of twenty simulated earthquakes provide a reliable description of the information contained within acceleration records. Empirical relationships for displacement ductility and Normalized hysteretic energy demand spectra are developed.

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