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美国的木材资源十分丰富,过去全美每年建造的100万幢住宅几乎都是木质结构。近年来,随着经济发展和消费变化,美国出现了一股用镀锌马口铁替代木材建房的新潮流。用轻型工字型标准铁架代替标准木材建房,这股风是两年前首先从北卡罗来那州刮起的。美国虽然拥有丰富的木材资源,但由于采伐量的增加,木材积蓄量急剧下降,木材价格不断上涨,铁结构就显得便
The wood resources in the United States are very rich. In the past, one million buildings built every year in the United States were almost all wooden structures. In recent years, with the economic development and consumption changes, the United States has emerged a new trend of using galvanized tinplate as a substitute for wood construction. The lighter I-frame standard iron frame was used instead of standard timber to build the house. This wind was first blown from North Carolina two years ago. Although the United States has abundant timber resources, due to the increase in cutting volume, the amount of wood savings has dropped sharply, and the price of wood has been rising, and the iron structure has become apparent.