Choosing the best urban tunnels as safe space in crisis using AHP method: a case study in Iran

In recent decades, experiences resulted from Modern wars have shown that aggressive armies have targeted vital and sensitive resources of the other countries in order to decrease their expenses in one hand and increase damages in other hand, defending countries transmit their critical and sensitive facilities to safe underground spaces in order to reduce damages, and experience has shown that underground spaces receive the least damage. This study tries to examine and prioritize Tehran tunnels as undergroundsafe spaces at crisis times regarding their structural parameters and also civil defense arrangements. It could accelerate the selection and creation of underground-safe spaces at crisis and it also can decrease construction and maintenance costs. This study has used AHP method to evaluate Tehran tunnels. In this regard five indices have been chosen by asking experts in the related fields and to evaluate and select a proper way to choose the best one as an urban-safe space. Finally, the investigated tunnels are prioritized as Tohid weighted as 0.349, Niyayesh weighted as 0.279, Resalat weighted as 0.197 and finally Amir Kabir weighted as 0.164 respectively that showed Tohid tunnel is the best urban-safe space and, Niyayesh, Resalat and Amir Kabir tunnels take the next places in the ranking, respectively

Selecting the best architectural form of the office building with the level of non-stop function against explosion

Regarding the importance of structures in sustainable development of countries, the necessity to consider them versus inflicted forces has an especial position. One of the inflicted forces upon these structures is explosion. Given that the resistance of a construction against blast wave depends on the form and shape of the building, numbers of trap doors and openings, power and quality of materials utilized in the building; in consequence, studying and evaluating types of construction forms versus outcomes resulted from explosion find importance. The behavior of three kinds of buildings including the forms of cone, hemisphere and frustum were, therefore, evaluated in the research. Various methods can be applied in order to assess behavior of construction against blast load, however, Finite Element method has been utilized in the article duo to particular capabilities of it in the blast assessments. Then, results of blast loading over the constructions were surveyed and it was concluded that buildings with hemispherical form show the best manner and providing openings called colloquially blast walls are used in the building; construction resistance versus blast load is raised

Evaluation of light supply in the public underground safe spaces by using of COPRAS-SWARA methods

One of the most significant issues in the safe underground spaces is the supply of light during the conditions in which there is no possibility to use national electricity network in crisis. Hence, attention to the source management of light supply possesses worthy importance. Light is one of the important issues in underground safe spaces which must be noticed with particular obligations. In the research, in order to evaluate variety of light supply methods in underground safe spaces, a questionnaire was set in order to weigh affective indexes up and score each method. To determine the best index among different indexes, SWARA method was applied; then COPRAS method was used in order to analyze data of the questionnaire that the best choice among various strategies could be chosen. Results represented that the choice of light supply by the lamp with battery source to provide light for city shelters is the best. According to results gotten from this method, choices of light supply by the fossil fuel light, light supply by the urban power source lamp, light supply by the mirror and light supply by fiber optics have been ranked in second, third, fourth and fifth positions, respectively

Model for rapid assessment of vulnerability of office buildings to blast using SWARA and SMART methods (a case study of swiss re tower)

Accidental and intentional explosions are incidents often destroying buildings and leaving casualties. As a re­sult of these blasts all over the world, demand of safe constructions with less vulnerability to explosions is rising. A large number of office buildings are built each year in many countries, housing large numbers of staff and clients, and due to specific nature and function, activities and services, these buildings are usually centrally located. Their architectural form being vital, therefore the article attempts, firstly, to present indices depicting the building form from the viewpoint of vulnerability to explosion. Secondly, the article presents such indexes as: capability to reduce blast effects, economic factors, simplicity of implementation, relationship among spaces in the crisis condition, and creating the least unusable space. The model of rapid assessment of vulnerability of office buildings forms to blast, SMART (simple multi attribute ranking technique) procedure is used and, applying the SWARA method, the weight of each major index and sub-index is arrived at. The model presented in the paper shows the assessment systems using figures between zero and a hundred, and four levels of vulnerability: weak, medium, good and excellent. The closer the figure to a hundred, the lower the vulnerability of the office building forms to blast. Swiss Re Tower case study was presented in the article rating of vul­nerability of this building against explosion. It was found to be equal to 62.11%, and its standing was at medium level

Reinforcement of laminated glass facades against the blast load

The first defensive element of the building against the explosion is the façade. On the condition that façade is not resistant against explosion and encounters the damage, the blast wave will enter the construction and increases financial losses and casualties. With respect to that glass facades do not possess adequate strength under the explosion; the major aim of the study is to examine variety of the reinforcement practices of glazing facades with the laminated glass subjected to the blast wave. The investigation has been done by two descriptive and simulation approaches with the finite element software of AutoDyn and eight simulations has been represented in the subject of laminated glasses. In addition, through AHP method, related questionnaires were designed so that some experts including 31 people possessing the activity and investigation background of two to thirty years in the civil protection scope answered them. Considered indexes in AHP model consist of resistance against explosion, passed light rate, expenditure, complexity and difficulty of accomplishment so that in the resistance part versus explosion, the results of numerical simulation have been benefited. Outcomes demonstrate the best function in laminated glass models belongs to the overlapped louvered opening model. Afterwards, the model of two-layer laminated glass with the spring is laid. Furthermore, the most economical model which supplies the most light as well as the most safety is the model of one-layer laminated glass with spring

Risk Assessment for Water Supply Systems in Iran During Crises Using the RAMCAP Method

Heavy damages might be inflicted upon national infrastructure due to a variety of disasters caused by natural events or human activities. One example of such vital infrastructure at risk is the water supply system. At the time of crises, the water supply system is expected to continue supplying water to citizens, or the crisis will be augmented. This warrants the potential threats and their effects on the system to be identified and evaluated in an attempt to determine the vulnerable systems and sites toward proper solutions. In this study, the assets and the associated threats of the water supply are identified followed by a vulnerability analysis. The RAMCAP method is then employed to determine values for the risks associated with each of the assets including dams, water storage systems, pumping stations, treatment plants, water wells, and building units. Methods are proposed to reduce these risks before a crisis occurs. In addition, basic threats due to air-missile and Cyber attacks are also considered

Corrigendum

"Corrigendum." Journal of Civil Engineering and Management, 22(7), p. 97