Performance of Degrading Reinforced Concrete Frame Systems Under the Tohoku and Christchurch Earthquake Sequences

Field investigations after the recent Tohoku and Christchurch earthquakes reported failure of structural systems due to multiple earthquakes. In most failure cases the reported damage was mainly due to dramatic loss of stiffness and strength of structural elements as a result of material deterioration due to repeated earthquake loading. This study aims to investigate the degrading behavior of reinforced concrete frame systems subjected to Tohoku and Christchurch earthquake sequences. Numerical models of RC frames that incorporate damage features are established and inelastic response history analyses are conducted. The results presented in this study indicate that multiple earthquake effects are significant.     

Israel and Post‐Mubarak Egypt: Perils of Historical Analogy

Prime Minister Benjamin Netanyahu of Israel has perceived the Egyptian Revolution of 2011 as a replica of Iran's 1979 Islamic Revolution. Drawing on the apparent similarities between the two revolutions—both made against dictators who reigned over secular, Western‐oriented regimes advocating coexistence with Israel, and both having Islamists as the best‐organized opposition force—Netanyahu appears to have concluded that the outcome for Israel would be the same: the advent of an aggressive Islamist regime in Cairo that would initiate a larger conflict. Based on this historical analogy, the Netanyahu government has adopted policies that are meant to help Israel defend against the potential deterioration in relations with Egypt. However, looking at Iran 1979 to draw on lessons about Egypt 2011 is misleading and does not take into account the significant differences that would rather lead Egypt to preserve the peace. This article analyzes Netanyahu's employment of this historical analogy and examines other appropriate lessons that Israel could draw from Iran's Islamic revolution, and proposes that Israel should instead engage the Egyptian revolution and reach a peace deal with the Palestinians so that it avoids misperception and maintains the Egyptian–Israeli peace.     

Design Methodology for Seismic Upgrading of Substandard Reinforced Concrete Structures

This article presents a design methodology for seismic upgrading of existing reinforced concrete (RC) buildings. The methodology is based on the modification of the deflected shape of the structure so as to achieve a near-uniform distribution of interstorey drift along the building height, thereby eliminating damage localization. Yield Point Spectra are utilized for the definition of demand and a direct displacement-based design approach is implemented. The fundamental steps of the method are described in detail, including a systematic evaluation of assumptions and limitations. A full-scale tested structure is used as a case study for assessment and verification of the proposed methodology. Alternative retrofit scenarios are set according to target response and performance levels. The role of the target deflected response shape and its influence on the outcome of the retrofit strategy is investigated. The viability of the alternative retrofit scenarios is studied for different ground motions including near-fault earthquake records.     

Yaḥyā Dawlatābādī’s Contribution to Persian Poetic Modernity

In 1912, Ya?yā Dawlatābādī composed two poems, the form of which diverged greatly from the canonical rules of tradition. Both poems were based on syllabic meters. Critics and historians of modern Persian literature have given these poems little consideration, and discussed them merely from the point of view of metrics. When compared to the great modernist endeavors in the poetry of the time, these pieces were judged severely, or altogether disavowed. This paper aims to show that, beyond mere metrical audacity, Ya?yā Dawlatābādī’s syllabic poems were in fact innovative. As the article argues, they were born out of the same quest for fresh poetic forms that induced contemporaneous modernists to create new, individualized poetic patterns.     

An evaluation of local policies and actions that address climate change in Turkish metropolitan cities

As sites of climatic impacts, cities have become key players in climate policy-making in order to reduce GHG emissions and vulnerabilities of settlements. They started taking actions in various fields such as built environment, water and waste management, transportation and urban greenery. However, the involvement of cities in climate policy-making varies over countries and regions; the extent of involvement differentiates even among the cities of the same country. This paper focuses on the Turkish case and elaborates the current status of climate policy-making in Turkish metropolitan cities. It aims at identifying achievements at the local level and pointing to challenges for an effective local climate action, which can be helpful for other contexts, too. Having conducted both desk-based and questionnaire surveys, it examines and categorizes climate-related actions in metropolitan municipalities, and highlights varying levels of achievements in terms of sectors and innovativeness. The study concludes with analysing the motives behind varying achievements of municipalities as well as the main challenges for local action and discussing policy implications to overcome them.     

A Theory of Reduplication: Eightfold Meters in Classical Persian Poetry

It is a known fact that classical Persian poets were partial to poetic meters composed of eight feet, known as muthamman. On this topic, however, two issues remain unsolved: How did the Persian poets devise these meters in the first place? Despite their flagrant predilection for eightfold meters, why did the Persians never use such meters as sarī? and qarīb in this form? This paper argues that the Persians, influenced by the structure of the Arabic eightfold base meters, crafted their muthamman meters after a specific process of reduplication. This theory also accounts for the lack of eightfold sarī? and qarīb meters, their structure being incompatible with the reduplication process.     

On-line Model Updating in Hybrid Simulation Tests

Hybrid simulation has emerged as a relatively accurate and efficient tool for the evaluation of structural response under earthquake loading. In conventional hybrid simulation the response of a few critical components is obtained by testing while the numerical module is assumed to follow an analytical idealization. Where there is a much larger number of analytical components compared to the experimental parts, the overall response may be dominated by the idealized parts hence the value of hybrid simulation is diminished. It is proposed to modify the material constitutive relationship of the numerical model during the test, based on the data obtained from the physically tested component. An approach based on genetic algorithms is utilized as an optimization tool to identify the constitutive relationship parameters used in updating the numerical model. The proposed model updating approach is verified through two analytical examples of steel and reinforced concrete frames. The results show the effectiveness of the updating process in minimizing the errors, compared to the assumed exact solution.     

Public Policy Issues and Campaign Strategies: Examining Rationality and the Role of Social Media in a Legislative Election Within a Middle Eastern Context

While most studies from western countries emphasize rationality in electoral behavior, the present study proposes that rationality is also a driver of candidates’ behavior in a non‐Western context. The purpose of the present study is to map campaign content as well as campaign strategies of 214 candidates in the 2015 United Arab Emirates legislative elections. The qualitative analysis showed rational consideration drove the selection of both campaign strategies and public policy positions. Candidates decided to include patriotism and social and economic policy issues in their campaigns to attract votes. In addition, while candidates utilized social meda in their campaigns hoping to maximize their voter outreach, doing so was not necessarily decisive in garnering more votes. Thus, juxtaposed with social meda channels like Twitter, Facebook, Instagram, YouTube, SnapChat, and GooglePlus, traditional campaigning strategies remained very potent.     

Application of In-Test Model Updating to Earthquake Structural Assessment

Analytical methods are frequently utilized for structural assessment due to their simplicity and cost-effectiveness. However, modeling of material inelasticity and geometric nonlinearity under reversed inelastic deformations is still very challenging and its accuracy is difficult to quantify. On the other hand, realistic experimental assessment is costly, time-consuming, and impractical for large or spatially extended structures. Hybrid simulation has been developed as an approach that combines the realism of experimental techniques with the economy of analytical tools. In hybrid simulation, the structural is divided into several modules such that the critical components are tested in the laboratory, while the rest of the structure is simulated numerically. The equations of motion solved in the computer enable the integration of the analytical and experimental components at each time increment. The objective of this article is to apply a newly developed identification and model updating scheme to acquire the material constitutive relationship from the physically tested specimen during the analysis to two complex hybrid simulation case studies. The identification scheme is developed and verified in a companion article, while the two experiments presented in this article are selected such that they address different structural engineering applications. First, a beam-column steel connection with heat treated beam section is analyzed. Afterwards, the response of a multi-bay concrete bridge is investigated. The results of these two examples demonstrate the effectiveness of model updating to improve the numerical model response as compared to the conventional hybrid simulation approaches.