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21.
P-Δ effects can cause instability if they are not properly accounted for during the design of bridge piers and other structures. When a bridge pier is designed with the Direct Displacement-Based Design Method, P-Δ effects are evaluated at the end of the design process and compared to the flexural strength of the pier to find a stability index. If the stability index exceeds the specified value, the design must be repeated, iteratively reducing the target design displacement. This article presents a model that when used at the beginning of design (without knowledge of strength) allows the estimation of the maximum lateral displacement that a bridge pier can sustain without exceeding the specified value of the stability index, therefore eliminating the need for iteration. The examples that are presented prove that the model is accurate and very useful for design of extended pile bents. 相似文献
22.
This study is aimed at investigating the demand on shear panel dampers (SPDs) installed in steel structures under strong earthquake motions to serve as guidance for the recommended capacity of SPDs in seismic design. For this purpose, an extensive dynamic analysis is carried out on steel bridge pier structures with SPD devices. To describe the restoring force characteristics of SPDs, the analysis uses a newly developed combined hardening model based on experimental data. The seismic demands made on SPD devices are examined and then summarized to give recommended values for determining the necessary deformation capacity of SPDs. 相似文献
23.
A direct methodology for solving the seismic intensity of each point on the capacity curve is proposed. By utilizing the procedure, a continuous curve between the structural response and the seismic intensity, the structural response function, can be easily generated. Unlike previous procedures that search for the performance point of a determined seismic intensity, the proposed methodology easily draws the full curve without iterations. The procedure is applicable to both a smooth design spectrum and an actual response spectrum. Examples indicate the methodology is accurate and fast, and convenient to be combined with existing procedures, such as Modal Pushover Analysis. 相似文献
24.
M. Moghaddasi M. Cubrinovski J. G. Chase S. Pampanin A. Carr 《Journal of Earthquake Engineering》2013,17(6):820-850
This article highlights soil-structure interaction (SSI) effects on the seismic structural response accounting for uncertainties in the model parameters and input ground motions. A probabilistic Monte Carlo methodology was used to conduct approximately six million dynamic time-history simulations using an established rheological soil-shallow foundation-structure model. Considering the results yields outcomes that contradict prevailing views of the always beneficial role of SSI. In other words, the likelihood of having amplification in structural response due to SSI is large enough that it cannot be readily ignored. This research provides a significant first step towards reliability-based seismic design procedures incorporating foundation flexibility. 相似文献
25.
R. Alan Covey 《Journal of Archaeological Research》2008,16(3):287-338
During the Late Intermediate period (LIP, c. A.D. 1000–1400), the central Andes experienced the decline of the Wari and Tiwanaku states, as well as processes of state formation, regional population growth, and competition culminating in the imperial expansion of the Chimú and Inka polities. The LIP holds the potential to link the archaeological features of early Andean states with the material signatures of the later ones, providing a critical means of contextualizing the intergenerational continuities and breaks in state structures and imperial strategies. The recent proliferation of LIP research and the completion of a number of regional studies permit the overview of six LIP regions and the comparison of highland and lowland patterns of political and economic organization, social complexity, and group identity. 相似文献
26.
27.
Dominique Pestre 《History & Technology》2013,29(4):351-369
This article explores the last 30 years of science studies. It presents what the author takes to be some of the main questions raised in this field, the solutions most of its practitioners advocated, and what informed their intellectual and political attitudes. It tries to place the social studies of knowledge in a broader perspective, linking it to parallel changes in anthropology, sociology and history, and it questions its relations to social change on the one hand, and to the political on the other. It closes with a critique of some, often dominant, attitudes in the STS field. 相似文献
28.
Alireza Shomali 《Iranian studies》2016,49(1):29-55
The Philosopher of Rey, Mohammad-e Zakariya-ye Razi and his Ismaili adversaries, Abu Hatam-e Razi and Naser-e Khosrow, share a political understanding of religion according to which religion is a theologico-political system of domination. However, they are at odds over the political philosophy appraisal of religion qua a system of authority. The paper explicates the latter disagreement in part based on Razi's and his opponents' conflicting ideas about the nature of the faculty of Reason and its distribution among men. Consequently, the paper underlines a democratic implication of Razi's thesis on the makeup of the human intellect. 相似文献
29.
Michael Welch 《International Journal of Heritage Studies》2016,22(9):664-678
The ‘Troubles’ is a euphemism associated with sectarian conflict in Northern Ireland from the late 1960s until the late 1990s. Similarly, that term also is used to depict turmoil in all of Ireland between 1916 through 1924. During both eras, political imprisonment coupled with various forms of political violence (e.g. bombings, executions, and prisoner abuse) marred Irish society in ways that invoke socio-religious meaning. In particular, the sanctity of death captures the intense semiotics of those events and points to further theorising along lines of the Durkheimian tradition. As we shall examine herein, violations of the sanctity of death compound social conflict and the resistance it creates. Fieldwork was undertaken in Dublin and Belfast where official landmarks were explored in-depth: Kilmainham Gaol and the Crumlin Road Prison, respectively. Additionally in Belfast, other – unofficial – cultural sites provide further evidence of socio-religious symbolism, most notably the Irish Republican History Museum, Roddy McCorley’s Club in West Belfast, and murals in both Loyalist and Republican communities. Whereas Durkeimian theory remains at the forefront of the analysis, insights also are informed by heritage studies, in particular notions of cultural performance in contested societies. 相似文献
30.
In recent years, bio-energy with carbon capture and storage (BECCS) has been awarded a key role in climate mitigation scenarios explored by integrated assessment models and referenced in reports by the Intergovernmental Panel on Climate Change. Because a majority of scenarios limiting global warming to 2 °C or 1,5 °C include vast deployment of BECCS, a critical discussion has emerged among experts about the moral implications of thus introducing an unproven technology into the policy realm.In this paper, we analyse this discussion as it has played out between 2013 and 2019, with a focus on how expert narratives are constructed in the mass media about the possibilities for decarbonisation within the current political-economic order. We find there are almost no narratives that support massive deployment of BECCS, and that all narratives presuppose limits to decarbonisation imposed by the current political-economic system. The perception of such limits lead some to argue, through deterministic and apolitical narratives, for the necessity of negative emissions technologies, while others argue instead that “degrowth” is the only solution. Thus, there is a distinct lack of positive narratives about how capitalism can bring about decarbonisation. 相似文献