Probabilistic approaches using fragility functions effectively assess building damage caused by major earthquakes and consequent repair costs. Existing functions, however, are limited to reinforced concrete (RC) frames designed according U.S. standards, making them unsuitable for other design standards. This study addresses this limitation developing RC with interior beam – column joints classified based on joint strength margins. These margins were calculated the ultimate relative strengths...

Ground motion models predict the mean and standard deviation of logarithm spectral acceleration, as a function predictor variables such earthquake magnitude, distance site condition. Such have been developed for variety seismic environments throughout world. Some calculations, Conditional Mean Spectrum calculation, use this information but additionally require knowledge correlation coefficients between logarithmic acceleration values at multiple periods. predictions have, to date, primarily...

Abstract The present study developed a method for evaluating the response, damage, and repair cost of super high‐rise reinforced concrete (RC) buildings subjected to large‐amplitude earthquakes. response was numerically assessed using three‐dimensional 40‐story RC frame models under predicted seismic motions earthquakes along Sagami Trough Nankai considering effects slip behavior, slab cooperative width, stud‐type dampers. Even when mainframe exhibited slip, peak deformation effectively...

A deep-sea animal community crowded around whale bones was found near the summit of Torishima Seamount during submersible Shinkai 6500 cruise Japan Marine Science and Technology Center (JAMSTEC). The Seamount, east Island, about 550 km south off Tokyo, is tectonically situated in forearc Izu-Ogasawara (Bonin) arc-trench system. focus dives on seamounts system, where serpentinite recovered at time Leg 125 Ocean Drilling Program. community, therefrom, offers some significant insight origin...

The closed form equations for equivalent linearization method are presented. In velocity response spectrum constant region, the ductility is function of yielding strength, deformation angle and height structure. But in acceleration structure irrelevant to ductility. And strength It shown that these characteristics essential by discussion based on energy balance stationary random vibration. evaluation probability failure during design lifetime, which examined capacity also equations, utilized...

According to past surveys of pile-supported RC buildings, severe building damage was not reported so often although recorded seismic motions around the buildings were considerably larger than their design motion. An effect soil-pile-structure interaction is one most possible reasons for this earthquake-damage reduction. However, actual shaking records at those have been rarely obtained. Therefore, it difficult demonstrate phenomena with input motion and records, research works usually...

A simple evaluation method for amplification of response spectrum by surface strata is proposed. The proposed does not require any time history design ground motion. That means the can be utilized in and limit capacity calculation. In method, motion converted to equivalent power density. transfer function evaluated one dimensional elastic wave propagation theory. density at using peak factor. good accuracy achieved amplification.

This paper presents the simplified approximate equation for ultimate moment of reinforced concrete interior beam-column joint. The proposed is derived by extracting main terms theoretical equation. convergent calculation omitted, and branch conditions are without significant loss accuracy. able to calculate not only at both beam column rebar yielding but also that when stress given critical reinforcement.

This paper describes evaluation of torsional response by equivalent linearization method considering higher mode response. In the authors' study, (after named NoLMM) for multi-story symmetric buildings was proposed. this NoLMM is extended and adapted to single-story unsymmetric buildings. The analysis results agree with that time domain dynamic analysis. It important consider not only responses but also modes interaction in Accuracy improved failure process.

In this paper, the scaling equation between pseudo velocity response spectrum and energy is proposed. Utilizing random vibration theory, maximum of SDOF given as function power density main part earthquake motion. Whereas, equal to Fourier amplitude smoothed by spectral window, which clearly pointed out Kuwamura, et al. Finally, derived, making connection considering nonstationarity The proposed verified not only using artificial motions but also observed strong ground both interplate...

大地震の被害をリアルタイムに推定し, 状況を把握するためのシステム開発が進められている．このシステムでは, 発災直後に強震観測記録から各地の地震動分布を推定し, 被害関数を用いて建物被害棟数を推定する．しかし, 被害関数は過去の地震被害の統計モデルであり, 個々の地震被害を精度よく推定できるとは限らない．本報では, ベイズ更新を応用して, 先行的に得られた一部地域の被害棟数情報を反映して, 被害関数のパラメタを更新することで精度の向上を図る手法を提案した．

This paper presents the experimental data to improve ductility of prefabricated concrete piles under earthquake and suggestion restoring force model for those piles. Recently, tend be used pile foundation medium low storied buildings, because are high workability cost efficiency in comparison with cast-in-place On other hand, lower than piles, produced by centrifugal molding. However, checking against deformation performance building is unnecessary standard law Japan. Therefore, not enough,...

The goal of this study is to clarify dynamic responses the Ojiya west high school that near an observation site where severe ground motions were obtained during 2004 Niigata-Chuetsu Earthquake. Firstly, field surveys superstructure and geological conducted. Next, simulation analyses performed using strong suppressible factors structure damage verified on basis results. Structural clarified both pile foundations building had almost no by earthquake. Geological response surface clay layer...

This paper presents the simplified approximate equation for ultimate moment of reinforced concrete exterior beam-column joint. The proposed is constructed dominant terms theoretical equation. convergent calculation omitted, and neutral axis ratio stress outside column rebar are given by empirical equations. applicable not only when both beam yielding but also critical reinforcement.

The method for evaluation of the building structure response reduction by soil interaction (SSI) from seismographs soil-structure system is presented.In proposed method, simplified SSI model employed, and parameter determined identification.In identification, both inertial (II) kinematic (KI) are considered.It also presented to indicate II KI respectively.The procedures applied observed records 2011 off Pacific coast Tohoku Earthquake.It clarified that effect decreased when super enters...

This paper describes the equivalent linearization method considering strength reduction of brittle elements. The following facts are found by numerical investigation employed time-domain response analyses. maximum weak story where element is lost well approximated model whose in removed advance. While responses stories elements not lost, arise typically before has been lost. In evaluation method, both responses, which correspond above-mentioned two states, evaluated, and greater states...

This paper dealt with methods of repair time assessment a building damaged by an earthquake. The is as important the cost economic loss damage in earthquake, because directly related to owner profit building, and indirectly occupants surrounding society due its function.

Seismic intensity scales for long-period ground motions are proposed as indices calculated from acceleration time histories filtered with the adequate frequency characteristics to fit human perception. The investigated based on correlation maximum responses of high-rise buildings. We find that seismic highly correlated story drift buildings derived both observation data during 2011 Tohoku-oki earthquake and simulation results Nankai trough megathrust earthquake, effective disaster...

The earthquake response analyses of the Iwagasaki High School, RC building which was slightly damaged during 2008 Iwate-Miyagi Nairiku Earthquake, are performed to examine correspondence relation analysis result and actual damage. In analyses, soil structure is estimated by performing simulation aftershock records obtained at this site, main shock analyzed using both model record JMA Kurikoma site near building. on pile foundation considering nonlinear interaction soil-pile-structure system...

In the conventional probabilistic hazard analysis, uniform spectrum(UHS) is used as ground motion which corresponding to probability of exceedance. The failure evaluated using UHS considered be conservative, because inter period correlation residuals prediction equation not incorporated in UHS. Recently, Baker and Cornell(2005) has proposed concept conditional mean spectrum(CMS) takes account equation. evaluation CMS, plays key role. Ordinarily decreases ratio two periods increases, but it...

The evaluation of expectation linear cumulative damage factor based on the ductility and is dealt with. In factor, wave number probabilistic distribution peak amplitudes are required. evaluated referring to closed form equation developed by Matsushima (1991). inferred from displacements center oscillation per. cycle. displacement considered follow gamma distribution. given integral random variable.

The nonlinear random response of soil-column subjected to non-white excitation is dealt with. formulation based on the stochastic linearization method developed by Atalik and Utku, hysteretic characteristic soil approximated Wen's model. And its parameter determined simulate Ohsaki-Hara model in prescribed strain range. numerical deal with arbitrary also presented. In this method, autocorrelation input motion used as derivative equation, external load term covariance matrix equation given...

This paper describes the equivalent linearization method considering higher mode effect. In non-linear response, one modal response affects characteristics of other modes. order to incorporate interaction, a multi-modal analysis extended region based on concept is proposed. The validity proposed examined through analyses using story shear models that form collapse mechanisms, because effects modes are remarkable in models. verification results show precision evaluation markedly improved by...

The reliability of the shear failure tend to be evaluated regarding force developed at yielding mechanism as load, although seismic structure is load. must because it impossible compare each other between indices different loads. In this paper, approximate equation for probability reinforced concrete building load during reference period presented. in explicit form utilizing Cornell's method. By dynamic magnification effect, response column increases over overall yield mechanism. order take...