PURPOSE:To ensure the quick and accurate designing for building structure by displaying a subsystem on a CRT for input, operation and checking respectively in accordance with the method of a system using the computer control. CONSTITUTION:An input system 4 includes a digital input convereter 3 which feeds input data 2 and 2' on a plan, a list of members, etc. of a basic module. The system 4 is connected to a comparator 6 and a memory circuit 7 of a computer 5. The circuit 6 is connected to a setting circuit 8 and then to a deciding circuit 10 via an arithmetic circuit 9. The outputs of the circuits 10 and 7 are displayed on a CRT11. In such a constitution, the data on the strength, tension, durability, etc. of standard members are previously fed to the computer 5 together with the member numbers and stress equations. Thus corrections are possible when the basic structure is decided. Furthermore these corrections can be confirmed with a checking system carried out after an arithmetic system is through.
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