Field Evaluation of Indoor Microclimates of Green and Bare Roofed Urban Buildings at No-Ventilation Condition in a Sub-Saharan Climate
Sadiq Abubakar Gulma,
Stephen Nyarindo Ondimu,
Patrick Ajwang,
Wariara Kariuki
Issue:
Volume 2, Issue 6, November 2014
Pages:
143-151
Received:
20 November 2014
Accepted:
30 November 2014
Published:
2 December 2014
Abstract: There is a growing use of green roofs on urban buildings around the world with a focus on reducing energy consumption of buildings. Energy consumption of buildings results mostly from heating or cooling of indoor spaces. When mechanical air conditioners are operating, windows (natural ventilation) are shut. This paper studied 2 field models, one with a living green roof and the other left bare (conventional), both without any sensible or latent heat loss or gain via their ventilation systems. Microclimatic data was collected at the field for the 2 rooms for a period of 25 days. Two microclimate parameters, air temperature and relative humidity which determines the highest effect on indoor thermal comfort were compared for the two models and with the ambient conditions. Result shows that both air temperature and relative humidity of the room with the green roof were lower than the bare roofed house. Fluctuations were also minimal for the green roofed urban building.
Abstract: There is a growing use of green roofs on urban buildings around the world with a focus on reducing energy consumption of buildings. Energy consumption of buildings results mostly from heating or cooling of indoor spaces. When mechanical air conditioners are operating, windows (natural ventilation) are shut. This paper studied 2 field models, one wi...
Show More
A Study on the Nonlinear Behavior of Crossing-Fault Buried Pipelines Using Pushover Analysis
Mahdi Shadab Far,
Nemat Hassani,
Reza Rasti,
Seyed J. Faraji
Issue:
Volume 2, Issue 6, November 2014
Pages:
152-157
Received:
16 December 2014
Accepted:
28 December 2014
Published:
12 January 2015
Abstract: Earthquakes can cause a lot of damages to buried pipelines. When pipelines are placed in a seismically active area, in addition to safety, performance, and environmental criteria, ground displacement hazards such as fault movements should be considered carefully. Therefore, the present study was aimed to evaluate the response of buried pipelines crossing ground deformation especially faulting based on nonlinear approaches. Considering the pipe as SHELL Element, soil as SOLID Element, and also non-linearity of material and geometry, several caseloads of buried pipelines crossing fault were modeled in the ABAQUS software. Then, all the models were analyzed in both tensile and compressive modes by Push-over analysis method. As a result, besides extracting the relationship between flexural moment and bending angle, the average of obtained curves were normalized and the standard five-line behavior curves were fitted to them. The developed curves can be simply used in any simplified modeling applications for assigning the plastic hinges to different types of pipelines.
Abstract: Earthquakes can cause a lot of damages to buried pipelines. When pipelines are placed in a seismically active area, in addition to safety, performance, and environmental criteria, ground displacement hazards such as fault movements should be considered carefully. Therefore, the present study was aimed to evaluate the response of buried pipelines cr...
Show More
