砖混结构农居工程造价受抗震设防标准的影响分析

Influence of Seismic Fortification Criterions on the Cost of Rural Residential Projects of Brick concrete Structure

摘要:

选取我国现代农村地区较有代表性的砖混结构农居作为研究对象，计算了砖混结构农居在不同抗震设防标准下的造价，得出：相对于不设防的情况，抗震烈度为Ⅵ度时单方造价提高大约17%；从Ⅵ度设防提高到Ⅶ度单方造价增加大约9％；从Ⅶ度设防提高到Ⅷ度，单方造价增加大约11％。分析发现引起砖混结构农居造价变化的主要原因是材料费，对造价的影响率达65%左右，其中又以钢筋和混凝土增加的费用影响最大。因此将砖混结构农居从不设防提高到更高的设防标准单靠农民自身的能力是不行的，政府必须给予适当的财政支持。

Abstract:

China has suffered from many destructive earthquakes in its history.Most of these earthquakes occurred in rural areas and caused huge casualties and economic losses.If we can improve the seismic performance of the rural residential project，it will alleviate the danger of earthquake disaster in rural areas，protect people’s life and property，as well as promote the harmonious development of social and economic resources.However，due to the unpredictability of earthquakes and the limitations of human resources，it is difficult to determine reasonable investments for rural housing structures.This study will calculate the rural construction cost in different seismic fortification criterion and provide a scientific basis for earthquake disaster mitigation.This paper chooses a brick-concrete structure as representative of the rural residential project and the research objective of China’s rural areas.The cost of constructing the brick-concrete structure is calculated under different seismic fortification criteria.The results are that unilateral cost is increased by about 17% in seismic intensity of 6 degrees relative to the undefended cases，and by about 11% for seismic intensity of 6 to 7 degrees, or by about 17% from seismic intensity of 7 to 8 degrees.Through analysis and comparison，we found that differences in rural construction costs of a brick-concrete structure were mostly related to the cost of raw materials.Materials for a brick-concrete structure rural residence increased by about 65%，with the cost of rebar and concrete increasing the most.Our work suggests that it is difficult for the current farmers to independently raise funds for the rural residential project of brick-concrete structures.Our government must provide adequate financial support to assist the rural residents to increase fortification standards for the structures.