Study on Mortar Finishing External Wall With Ventilation Space for Seismic Retrofitting


Abstract eng:
Mortar finishing external wall is one of typical external walls for wooden houses in Japan. It is constructed using sophisticated plasterers’ technics, which is able to be given various textures on the surface. The mortar finishing external wall shows good fire resistant performance and shear resistant performance, however, not a few mortar of the external walls fell off under earthquake in the past. The reasons of the falling off of the mortar were use of inadequate materials, decay of timber, corrosion of metal materials, etc. To improve its durability and prevent falling off of the mortar, ventilation method for the mortar finishing external wall has been introduced. With the ventilation space, since moisture is vented out of a wall, it is able to be kept dry. This research project was conducted to evaluate the seismic performance of a wood frame with the mortar finishing external wall equipped with ventilation space. There were several experimental researches on seismic performance of mortar finishing external walls in the past, but most of the external wall specimens had no ventilation space. The shear resistant performance of the past specimens was as good as conventional shear walls such as bracing or nailed plywood. It is expected that the mortar finishing external wall with ventilation space also shows good performance with proper materials. If the external wall with ventilation space is authorized as a shear wall, rational structural design will be realized. Furthermore, it will be a useful seismic element for seismic rehabilitation. Focusing on the mortar finishing external wall with ventilation space, basic mechanical characteristics of the wall element were examined through single shear test of staple and tensile test of mortar element specimen. In the experiments, some specimens were corroded by accelerated weathering. Moreover, incremental FEM analysis of the wood frame with the mortar finishing external wall containing two openings, namely window type opening and door type opening, was conducted using the shear force-displacement relationship of staple and tensile force-displacement relationship from the elemental experiments. From the analysis, it was found the maximum shear strength of the wood frame with the mortar finishing external wall with ventilation space is approximately 10kN/m even with openings and also found that a decrease in the shear force is relatively small even degradation occurs. It is considered that using mortar finishing external wall is applicable for seismic retrofitting.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



Record appears in:



 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4213.:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)