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At present, the cost of light steel superstructure in China is slightly higher than that of traditional brick and concrete structure, which is one of the reasons that affect the selection of some owners or investors. In fact, it is one-sided to only pay attention to this point. The cost of superstructure accounts for a small proportion of the total investment of the project, and the price difference caused by different building forms is smaller. The single factor should not be taken as the decisive factor in the selection of structural materials. According to the modern point of view, the comprehensive economic benefit evaluation index of light steel buildings should at least include the following aspects: total investment cost, investment return period, applicability of buildings, environmental protection factors, human and social environmental factors, etc.

这里特别讨论轻钢建筑房屋结构的防火问题。钢结构防火主要采用防火涂料、发泡防火漆、外包防火层(较少使用)等措施．本质上是一种火险发生后避免因建筑主结构破坏而引起重大财物损失的措施。国外主要使用厚涂型不燃性无机涂层，时效厚度指标可达4h／50mm，国内偏向于使用厚度3～7mm的薄涂型防火漆，耐火时效0.5～1．5h。当前的防火成本过高，效果却不很理想。本文认为，有必要就因强制性的防火标准的实施而导致的整个轻钢建筑市场的成本增加量与平均火灾率下的总损失量进行统计分析和比较。

This paper discusses the fire protection of light steel building structure. The fire prevention measures of steel structure mainly include fire-proof coating, foam fire-proof paint, and external fire-proof layer (less used). In essence, it is a measure to avoid major property loss caused by the damage of main structure of building after the occurrence of fire risk. The foreign countries mainly use thick coating type non combustible inorganic coating, the aging thickness index can reach 4H / 50mm, the domestic prefer to use thin coating type fireproof paint with thickness of 3-7mm, and the fire resistance aging is 0.5-1.5h. At present, the cost of fire prevention is too high, but the effect is not ideal. In this paper, it is necessary to make a statistical analysis and comparison between the cost increase of the whole light steel construction market and the total loss under the average fire rate due to the implementation of mandatory fire protection standards.

若后者较小，对通常的轻钢建筑不宜做严格的要求，可以在选材上适当考虑，如尽量采用不燃性隔热保温或装饰产品，选用具备一定阻燃性能的防腐涂层等，同时要求业主采取严格的防火安全管理措施。另外，可按防火成本的一定比例向业主收缴费用以成立火灾补偿基金，既可降低总成本，又能风险分担，比较合理。

If the latter is small, it is not suitable to make strict requirements for ordinary light steel buildings, and proper consideration can be given to the selection of materials, such as using incombustible heat insulation or decorative products as far as possible, selecting anti-corrosion coating with certain fire-retardant performance, etc., and requiring the owner to take strict fire safety management measures. In addition, the fire compensation fund can be set up by collecting fees from the owner according to a certain proportion of the fire protection cost, which can not only reduce the total cost, but also share the risk, which is more reasonable.