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“...Damage Assessment of Cultural Heritage Structures after the 2015 Gorklia, Nepal, Earthquake: A Case Study of Jagannath Temple Sujan Shrestha,a) Bipin Shrestha,b) Manjip Shakya,c) and Prem Nath Maskeyd) The Gorkha, Nepal, earthquake and the series of aftershocks that followed have damaged many heritage structures in and around Kathmandu Valley, including UNESCO World Heritage Sites (WHSs). This paper summarizes observed damage to the heritage structures of diverse typologies within the UNESCO WHSs of Kathmandu Valley. As a part of the investigation, inspection survey and damage assessment were carried out for Jagannath Temple, one of the partially damaged monuments in the Kathmandu Durbar Square WHS. .Ambient vibration and in-situ tests using the pendulum hammer, the rebound hammer, and in-place push on masonry walls were performed. Finite-element models of the structure were developed, and the results were analyzed and compared with field observations. Based on the observed damages and...”
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“...and failure of timber connections. Such damage can trigger the sudden or brittle collapse of a masonry structure with very little warning. For effective restoration and conservation of any historic building, a detailed assessment of the structure and of the physical damage to its masonry is required, for which a deep knowledge of actual internal construction, geometries, materials, morphologies, and mechanical properties is necessary. Table 1. Damage states in the seven Kathmandu Valley World Heritage Property monument zones Monument zone Number of classified monuments Number of totally collapsed monuments Number of partially damaged monuments Hanuman Dhoka Durbar Square 97 11 39 Bhaktapur Durbar Square 39 5 14 Patan Durbar Square 44 6 21 Changunarayan 67 3 2 Pashupati 44 6 21 Swayambhu 82 4 9 Bauddhanath Partial damage in stupa...”
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“...DAMAGE ASSESSMENT OF CULTURAL HERITAGE STRUCTURES: JAGANNATH TEMPLE S3 65 In this paper, a brief description of the architectural features of these buildings and their seismic performance during the Gorkha earthquake is provided. Finally, a case study of the Jagannath Temple is presented, which includes investigation of the structure, in-situ testing, and analytical modeling. HERITAGE BUILDINGS OF THE KATHMANDU VALLEY The cultural heritage buildings in Kathmandu Valley can be classified into three categories: tiered temples, shikhara temples, and stupas (Tiwari 2009, Korn 1976, Dangol 2007). In general, the tiered temples of Kathmandu Valley are square in plan, with two or three tiers. Only two four-tiered and two five-tiered temples exist in the valley (Tiwari 2009). Large temples with two or more tiers are usually constructed with two core walls surrounding the sanctum core (Tiwari 2009) (Figure 2a). The walls are constructed as a composite of interior kiln-fired rectangular bricks and...”
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“...DAMAGE ASSESSMENT OF CULTURAL HERITAGE STRUCTURES: JAGANNATH TEMPLE S367 (a) Separation of corner walls (c) Delamination of outer wall wythe (d) Total collapse Figure 3. Tiered temple damages types. masonry walls surround the frame from the outside. Moreover, the wall thickness gradually decreases from the lower to the top level. It has been observed that these structure types face partial to total collapse in different scenarios, such as in the absence of internal timber framing or weak timber connections or already decayed timber elements. (Figures 4b-4e). Lack of monitoring and maintenance, poor detailing of timber elements, inadequate intervention, and aging also significantly contributed to the collapse of the tiered temples. In some cases, the main wooden elements—columns, beams, wall plates, and ring ties—which are critical in seismic resistance in traditional construction (Bonapace 2003, Shakya 2012), were found to be unconnected to each other (Figure 5a) and in some cases had decayed...”
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“...DAMAGE ASSESSMENT OF CULTURAL HERITAGE STRUCTURES: JAGANNATH TEMPLE S3 69 Figure 6. Vatshala Temple, Bhaktapur Durbar Square before and after earthquake. (a) Crushing of old brick work in (b) Timber/clay tile roof of structure replaced with Pratappur temple concrete roof Figure 7. Damages due to variations in material integrity during restoration work. portion of the old and new construction, resulting in the crushing of old brick work around the circumference. In contrast, the Anantapur Temple, with almost the same configuration in the same locality and which had never before been restored, experienced partial collapse at the top and shear cracks in the ground wall. It is worth noting that, in the first case, the compatibility of materials in restoration work was at issue whereas at .Anantapur lack of proper monitoring and maintenance, along with the age of the structure led to the damage. In some cases, timber and clay tile roofs were replaced with concrete, adding substantially to the...”
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“...DAMAGE ASSESSMENT OF CULTURAL HERITAGE STRUCTURES: JAGANNATH TEMPLE S37I Undamaged Partially damaged Heavily damaged (a) Damage grade of structural wall □ Limo Surkhi Mortar Ground Floor Plan MudMonar Jagannath Temple Second Floor Wan Inclination Jag&nnath Temple (c) Inclination measurement of top floor wall (b) Different composition of masonry wall (d) Damage in upper wall Figure 9. Condition assessment of Jagannath Temple. NUMERICAL MODELING To evaluate the response of the temple during the Gorkha earthquake, finite-element analysis was performed in SAP 2000 (v. 16.0.0). Given the limited knowledge of the temple’s material characteristics, nonlinear analysis of the masonry was out of the scope of analysis. In this study, the structural component materials were assumed to be homogeneous, isotropic, and linearly elastic. The masonry wall was modeled using solid elements, and timber elements were modeled using frame elements. In total, 1,890 solid elements and 784 frame elements were used...”
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“...DAMAGE ASSESSMENT OF CULTURAL HERITAGE STRUCTURES: JAGANNATH TEMPLE S3 73 (a) First mode (bending along X-axis), T=0.219sec; f= 4.55Hz X S33 Contour! (IQX) __________________________________» } ■» jolOB-l -[[H.mm.C u| (c) Direct normal stress S33 in +EQX loading (b) First mode (modified) (bending along X-axis), T=0.337sec; f= 2.96 Hz -. M3 Contour! IKJX) _______________________________________» I ■» |aioe»i jJ|kn,«,c xl (d) Direct shear stress S23 in +EQX loading JSC S33 Contour! (IQX) $= | 4 iGLOE-L <•; c, C (e) Schematic diagram of timber confinement (f) Direct normal stress S33 in +EQX loading in inner wall (with additional timber element) Figure 10. Numerical analysis results....”
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“...vertical and horizontal directions, in the inner wall (Figure lOe). The analysis revealed that induced stresses would be significantly reduced in this way and thus that timber bands in the masonry inner wall of the temple (Figure 1 Of) is a possible approach to minimizing damage in a future earthquake. CONCLUSION This paper presented details of the damage to various heritage structures observed after the 2015 Gorkha earthquake. Vulnerabilities of the heritage structures to strong ground shaking were noted, and it was observed that the damage patterns were difficult to generalize because they could be quite different in heritage buildings with similar architectural features. Moreover, damage to some of the buildings was exacerbated by inappropriate interventions, insufficient details regarding timber elements in rebuilt structures, and lack of maintenance. A case study using the Jagannath Temple was presented. To assess the condition of the temple’s masonry walls, limited field tests were...”
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“... and Pantazopoulou, S. I,2016. Simple seismic assessment of traditional unreinforeed masonry buildings, International Journal of Architectural Heritage 10, 1055-1077. Kathmandu Valley Preservation Trust (KVPT), 2000. The Kathmandu Durbar Initiative 2000-2003 Report, Lalitpur, Nepal. Kom, W., 1976. The Traditional Architecture of the Kathmandu Valley, 1st Edition, Ratna Pustak Bhandar, Kathmandu, Nepal. Kom, W., 2014. The Traditional Architecture of the Kathmandu Valley: The Shikharas, 1st Edition Ratna Pustak Bhandar, Kathmandu, Nepal. Langenbaeh, R., 2010. Earthquake resistant traditional construction is not an oxymoron. The resilience of timber and masonry structures in the Himalayan region and beyond, and its relevance to heritage preservation in Bhutan. Proceedings of the International Conference on Disaster Management and Cultural Heritage, 12-14 December, Bhutan. Nienhuys, S., 2003. Options for reconstruction and retrofitting of historic pagoda temples, reconstruction of temples in...”