Safeguarding Condition Of The Rock- Hewn Churches Of Lalibela Presented By Naol Gebeyehu Duguma

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This research focuses on the wind and structural analysis of the steel canopy structures shadingrnfive of the eleven monumental churches, Bete-Mariam, Bete-Mesquel, Bete-Medhaniealem,rnBete-Abalibanos and Bete-Amanueal, found in Lalibela. This world-renowned site with the rockhewnrnrnmonuments is one of the important heritage sites in Ethiopia, which is registered andrnprotected by the United Nations Educational, Scientific and Cultural Organization (UNESCO)rnsince 1978. Currently, the shades sheltering the five rock-hewn churches are showing visiblernsigns of failure at the base of the columns, which is one of the main reason for doing this research.rnA numerical analysis is performed on an underground tunnel, on which one of the columns ofrnthe shade sheltering Bete-Amanueal is directly placed. rnThe current shelters are implemented with a design change for a reason that UNESCO found thernprevious design too permanent. However following the design change there is no investigationrncarried out to properly identify the characteristic behavior of the subsurface condition. These,rncoupled with the conjecture of the uplift wind loading creating instability, has created the fearrnthat the failure of the canopy shelters may result in extensive damage or even total failure of thernrock-hewn churches. rnIn this study, the structural safety of the steel canopy structures is investigated based on the rawrnwind data collected from the National Metrology of Ethiopia for the Lalibela area. The designrnbasic fundamental wind speed is decided based on the probability distribution, which best fitsrnwith the available data. The wind load analysis performed on the structure clearly shows that thernuplift wind is critical and is likely to cause further structural damage to the canopy structures.rnBased on this finding, long term and alternative short-term mitigation measures are discussedrnconsidering constraints, such as simplicity, non-labor intensiveness and compliance with thernUNESCO regulations specified for the shelter project. The rock mass has also been studied andrnclassified using one of the multi-parametric rock mass classification methods, the Rock MassrnRating (RMR), to quantify the in-situ condition of the tunnel.

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Safeguarding Condition Of The Rock- Hewn Churches Of Lalibela Presented By Naol Gebeyehu Duguma

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