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The purpose of this study was to find out the most reasonable design in the superstructure of an underground parking lot which needs to be considered with the economic efficiency being influenced on the subdivision price, construction duration, workability and the maintenance of crack and leakage status of apartment house. In this research, we`ve evaluated the fitness for the superstructure of an underground parking lot by examination of construction constraint, which was based on the calculated data of structural design and quantity survey. The results of this study are summarized as follows. 1. The system of the absent structure of beam is proper structure for economic efficiency, construction duration and workability, but it is disadvantageous at the side of maintenance efficiency because of the many part of large slab. In the opposite direction, the establishing structure of beam has the advantages of structural stability except economic efficiency, construction duration and workability 2. It`s required a proper selection for the views being contrary to each other which the owners considers good quality, on the other hand, the contractors consider construction duration and workability. 3. In making a selection for the superstructure of an underground parking lot, we have concluded that it is the most important to choose the proper structure for the demanded performance by contrasting with two system. (2Bay or 3Bay)

This paper introduces the cable-stayed bridge which has the elliptic pylons. This bridge is the main bridge of the 4th construction zone, and has two spans and each of them is 115m long (2@115= 230m). The deck of the bridge is made of steel plate. It is located in the connecting road to Incheon Grand Bridge. There are several design issues; such as the landscape design concept of the bridge and the structural behaviour of the cable-stayed bridge. Also, a construction issue is the pylon roll- up erection.