Seismic retrofitting of rural rammed earth buildings using externally bonded fibers

Li, Kai; Wang, Ming; Ya-an, Wang

doi:10.1016/j.conbuildmat.2015.09.048

Cited by 61 publications

(27 citation statements)

References 7 publications

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“…Research on TRM strengthening for rammed earth buildings started recently, and the first outcomes show improvement of the overall seismic capacity similar to that obtained in the case of adobe (Liu, Wang, and Wang 2015;Wang et al 2017;Fagone, Loccarini, and Ranocchiai 2017). Nevertheless, the very few researches conducted so far lack a comprehensive approach of the strengthening system, as the global performance of the reinforcement is the main-addressed aspect.…”

Section: Introductionmentioning

confidence: 74%

“…Earthen buildings are also well known for their high seismic risk, which results from the high seismic hazard where they are located, the high seismic vulnerability of the structures and the high seismic exposure, as it has been demonstrated by calamities caused by recent earthquakes (e.g. Bam 2003, Pisco 2007, Maule 2010 (Bui et al 2014;Liu, Wang, and Wang 2015)). In general, the seismic vulnerability of rammed earth constructions is due to low mechanical properties of the material, high self-weight and poor connection between structural elements, resulting in in-plane cracking of walls and out-ofplane mechanism of bearing walls with collapse of roofs and floors (Lourenço et al 2017;Costa et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on the Bond Behavior of a Compatible TRM-based Solution for Rammed Earth Heritage

Romanazzi

Oliveira

2019

International Journal of Architectural Heritage

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Despite the current awareness of the high seismic risk of earthen structures, little has been done so far to develop proper strengthening solutions for the rammed earth heritage. Based on the effectiveness of TRM for masonry buildings, the strengthening of rammed earth walls with externally bonded fibers using earth-based mortar is being proposed as a compatible solution. In this context, the investigation of bond behavior was conducted by means of direct tensile tests, pull-out tests and single lap-shear tests. The specimens were prepared using earth-based mortars and two different types of meshes (glass and nylon) while considering different-bonded lengths. The direct tensile tests on TRM coupons showed the high capacity of the nylon mesh in transferring stresses after cracking of the mortar. The pull-out tests highlighted that in the case of glass fiber mesh, the bond was granted by friction, while the mechanical anchorage promoted by the transversal yarns granted the bond of the nylon mesh. Finally, the single lap-shear tests showed that the adopted earth-based mortar seems to limit the performance of the strengthening.

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Section: Introductionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Bond Behavior of a Compatible TRM-based Solution for Rammed Earth Heritage

Romanazzi

Oliveira

2019

International Journal of Architectural Heritage

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“…Cost scenario B assumed retrofitting cost to be 30 % of the difference in replacement costs. It is more realistic than A according to various results (Liu et al 2015), although still a rough approximation due to the lack of local experiment data. All of these costs are supposed to be borne by the government.…”

Section: Effects Of Structure Retrofitting Measuresmentioning

confidence: 94%

Government Investment in Disaster Risk Reduction Based on a Probabilistic Risk Model: A Case Study of Typhoon Disasters in Shenzhen, China

Tao

Wang

et al. 2016

Int J Disaster Risk Sci

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In recent years, cost-benefit analysis (CBA) has played an important role in disaster risk reduction (DRR) investment decisions, and now increasing attention is being paid to its application in developing countries. This article discusses government investment choices in DRR against typhoon disasters in Shenzhen, China. While the existing literature mainly focuses on disaster mitigation measures such as structural retrofitting, this study proposes a holistic framework of DRR investments in which structural (windproof retrofitting) and financial (insurance premium subsidies and post-disaster relief) are all taken into account. In particular, intermeasure spillover effects are measured and used in CBA. The results show that insurance premium subsidies yield the highest benefit-cost ratio and should be prioritized in investment. Windproof retrofitting comes in second place in terms of the benefit-cost ratio and can be considered when there is a sufficient budget. These results further confirm the need of a holistic review of government DRR investments to derive policy recommendations, while challenges remain in relation to the probabilistic modeling capacity to support CBA.

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“…Rammed earth walls can be, primarily due to the mass and density of the wall, characterized by having a high degree of sound insulation [13]. An example is given in the Load capacity -walls made of rammed earth have appropriate load bearing capacity and additional, even significant, stiffening can be provided [14]. Fire protection -since earth does not burn, rammed earth walls have high fire resistance.…”

Section: Properties Of Rammed Earth Wallsmentioning

confidence: 99%

Energy Sustainability of Rammed Earth Buildings

Hegediš¹,

Karaman²,

Čeh³

et al. 2017

AFST

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Earth construction has long tradition in our civilization with wide distribution in various ways and techniques of application. When combined with other natural materials it is the material for construction of comfortable space for people. Increased need for energy efficient houses actualizes this type of construction in modern conditions as a holistic solution for modern buildings. In addition to many uses of earth as a building material, rammed earth wall came to consideration since it allows us to observe most of the advantages and disadvantages of this type of construction. Finding solutions to remedy observed disadvantages will lead to improved construction of adobe, wattle-and-daub, unbaked bricks, etc. This paper is aimed at proving energy efficiency of rammed earth wall and it points out possible research directions into improvements while preserving existing benefits. The most important issue is preservation of cost efficiency of earth building while using other natural supplements into the soil mixture.

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Seismic retrofitting of rural rammed earth buildings using externally bonded fibers

Cited by 61 publications

References 7 publications

Experimental Investigation on the Bond Behavior of a Compatible TRM-based Solution for Rammed Earth Heritage

Experimental Investigation on the Bond Behavior of a Compatible TRM-based Solution for Rammed Earth Heritage

Government Investment in Disaster Risk Reduction Based on a Probabilistic Risk Model: A Case Study of Typhoon Disasters in Shenzhen, China

Energy Sustainability of Rammed Earth Buildings

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