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As the rising conscious of sustainable building and the reconstruction of the September 21 Earthquake in Taiwan, the application of lightweight steel in the main structure framing has been formed gradually. As for the beginning of the application of lightweight steel building, on which the emphasis is how to produce it with rationalization、industrialization, and certainly realize the details of the entire building element; in order not to cause the faults in its performance and dissatisfy the occupancy. Floor is the most useful part which people contact the most. Presently with the lack of the emphasis above-mentioned, the slab construction has caused certain defects. Method of the research 1. By means of the arrangement of bibliographies, establishing a series of slab details and construction mechanism of the slab subsystem of lightweight steel buildings. 2. Establishing the primary data, finding out the opinions of the producers on the defects of all kinds of slab construction by gathering questionnaire from the producers. 3. By interviewing the producer and observation of the slab construction on site, looking into the defects and the possibility of the improvement of rationalization on the slab construction domestically. Achievements of the research 1. Base on the relationship of construction mechanism of the slab subsystem, there are still many kinds of slab constructions, which are not applied. And a new kind of slab construction has been invented domestically. It is thus clear that the slab construction in Taiwan still has room for development and improvement. 2. The reasons that the sub floors which are not applied in Taiwan, for PCC board is the high cost of importation and the difficulty to make the object of joint. For deck plat sub floor is the dispute of its performance. For KT panel and the R.C construction is the high amount of works on site, which also cause high cost. 3. The problems and the defaults of the sub floors applied in Taiwan almost concentrate on the earthquake resistance, sound isolation, fire resistance, weight reducing and the detail treatment problems. 4. The problems on the rationalization of production are as follows: A. In the aspect of systematization, the producers should make good use of their original capacity, or cooperate with other proper producers, to increase their capacity of systematization of production. B. In the aspect of standardization of plan, of which the producer should evaluate the benefit, in order to decide if it is worthy to make the standard plans. C. In the aspect of modular coordination and prefabrication, the sub floors applied in Taiwan still have room to improvement its rationalization of construction.
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