Seismic Design and Response of Framed Structures with Stiffening Bracing Systems

Stiffening Bracing System (SBS) is proposed as an alternative to conventional braced frames. SBS is intended to reduce the floor accelerations while maintaining uniform inter-story drift along the building height. The system ensures that additional damping devices distributed over the building’s height work efficiently. An iterative design procedure is developed to maintain a desired target performance. The procedure accounts for higher mode effects and supplemental damping. A series of nonlinear response history analyses on braced frames with various heights demonstrated the adequacy of the proposed procedure in achieving target structural performance and seismic demand prediction.     

Assessing stakeholders’ perspectives towards the conservation of the built heritage of Suakin,Sudan

The conservation of built heritage is recognized as a vehicle for sustaining local identity and a powerful instrument for urban regeneration. The problem of how to engage local culture in this process, however, has received comparatively little attention, despite the recognition of ‘stakeholders’ and the importance of their involvement. This research examines how collaboration between stakeholders might be established to conserve and thus help regenerate the historic and largely abandoned port town of Suakin. Semi-structured interviews were conducted with representatives of Suakin’s stakeholder groups and supported through archival analysis and observational studies. The intention was to explore the stakeholders’ views of the ‘conservation drivers’, ‘conservation practice’, and ‘conservation challenges and enablers’ affecting Suakin. The stakeholders’ response provides a preliminary status to the various perspectives concerning the conservation of Suakin’s built heritage. The findings identify a number of major issues impacting Suakin’s conservation and reveal a potential for implementing a comprehensive and inclusive conservation approach. The research establishes the case for further research to determine best methods to enable stakeholders to collaboratively address the issues impacting Suakin’s conservation. This approach to stakeholder involvement represents a new step towards the conservation of Suakin and a new contribution towards the conservation process.     

A preliminary study on using enzymes in cleaning archaeological wood

The main goal of this study was to study and evaluate the effect of hydrolyzing enzymes on the anatomical structure and chemical composition of archaeological wood samples. Pine and beech wood samples, which were taken from anonymous mashrabia, have been cleaned with three types of enzymes then a scanning electron microscopy (SEM) and infrared spectroscopy (FTIR) study were undertaken, to see if any significant structural or chemical differences could be detected between “untreated” and “treated” wood. No dramatic changes in functional groups on the wood surface, as monitored by infrared spectroscopy, occurred in the samples before and after enzymatic cleaning. SEM data, however, show that protease and lipase enzymes may give good results in cleaning wood surface, but the enzyme residues remaining on the cell walls of archaeological wood are another point to consider.     

Empowering the Local Saharawi People: Training for Rock Art Documentation in Western Sahara (DARSSO Project)

The former Spanish Sahara is the last remaining colony in Africa. Most of the local people have been living in refugee camps in Algeria for the last 40 years and this situation has largely conditioned the archaeological research in the territory for a long time. In spite of the Saharawi Ministry of Culture in exile occasionally collaborating with European academic institutions for the study of its huge archaeological heritage, the training of local archaeologists or initiatives exclusively aimed at targeting the self-management of the Saharawi Archaeology are rarely carried out. This could be due to the difficulties in getting funds for long-term projects in this area, among other factors. However, today’s technological revolution has come to the desert including mobile telephones, televisions, computers and even an incipient Internet connection. At the same time, current digital technology has encouraged the development of new methods of documenting rock paintings, which might be appropriate and more accessible for the Saharawi technicians. This paper discusses the successful and failed aspects, as well as future perspectives, of a training course in rock art documentation intended for empowering local archaeologists who are living in very unfavourable circumstances.     

A NEW CONCEPT AND EXHIBITION PROGRAM FOR THE EGYPTIAN MUSEUM IN CAIRO

This article presents a new concept for the future permanent display of the Egyptian Museum in Cairo, and discusses different practical ideas and concepts. Throughout the discussion, recent challenges and opportunities are considered, particularly the conflicts and duplication among the three major museums in Greater Cairo, the Egyptian Museum(EMC), the Grand Egyptian Museum(GEM), and the National Museum of Egyptian Civilization(NMEC). Different ideas are introduced, while selected options are then discussed. The author argues his suggestion to develop a concept that combines archaeological fieldwork, masterpieces, and visible storage in a presentation that varies from aesthetic, contextual and systematic display. This comes from the author's understanding of the expected audiences, their interests, the strengths of the collection, the exhibition space, and EMC's mission.     

The 4.2 ka BP Climate Event in Egypt: Integration of Archaeological,Geoarchaeological, and Bioarchaeological Evidence

The 4.2 ka BP climate event was a phase of severe global drought. Its evidence has been attested in many regions of the world and was reported to have played an important role in the collapse of major ancient civilizations. This article provides a comprehensive literature review using several proxies on the 4.2 ka BP climate event in Ancient Egypt. It applies a multidisciplinary approach that integrates archaeological, geoarchaeological, and bioarchaeological evidence. The conclusion is that the event had critical environmental, economic, and political impacts. It led to aridification, a decline in the Nile level and Nile-fed lakes, encroachment of aeolian desert sand into the Nile Valley, lower crop yields, and famine across ancient Egypt. Therefore, as a compound event, it played an important role in the collapse of the Old Kingdom (ca. 2181 BC), and its effect continued in the First Intermediate Period (ca. 2181–2055 BC) when Egypt witnessed political fragmentation.

     

Correction to: The 4.2 ka BP Climate Event in Egypt: Integration of Archaeological,Geoarchaeological, and Bioarchaeological Evidence

African Archaeological Review -