This paper introduce a calculation method for the length of steel and rebar due to load onto the member in large scale structure using precast composite structure system. As result, cost effectiveness of members in large scale structure is procurable by utilizing steel and rebar economically.

This paper introduce a reinforcement method for vertical extension of a building using a rahmen frame structural system. This approach has to be carried out by considering the structural safety due to the additional weights being exerted to the pre-existing building. The connections to fasten both the rahmen frames and original building were designed with the axial loads and moments acting on the rahmen frame structural system, that is extended vertically. This system reduces the structure self-weight and ensures non-additional of reinforcement.

Tensile forces loss of pre-stressed concrete member will occur with various causes. However, there are differences between calculation results introduced by design code and test results. It is important to reduce the number of errors. In this paper, we suggest measuring of tendon strain from jacking stage. The careful placement plan of strain gauge for PS strand should be considered because of twisted tensile behavior. Later, the experimental investigation would be conduct to make an accurate estimate of tensile forces loss.

A composite structural system which combines the advantages of reinforced concrete and steel structure is a structural system that has superior performance compared to the existing structural systems. In recent years, according to the increasing of attention for composite structures, the researches for the composite structures are more carried out. The composite beam used in this study is consisted of pre-cast concrete, cast-in-place concrete, T-type steel, and reinforcing bars. The steels are only used in each ends of the beam. In this study, the reasonable steels length at the ends of the beam is analyzed by structural performance analysis for changing in the length of the steel.

This study includes an analytical investigation of a composite beam consist of concrete, structural tees, and the reinforcement steel. The plastic hinge length theories are applied to this composite beam to calculate maximum deflection exactly. This composite beam can reduce the floor height compared with the reinforced concrete structure with same internal force. To calculate maximum deflection, we used plastic hinge length suggested by Corley, Sawyer and Mattock. Later, the experimental investigation should be performed to find out the plastic hinge length exactly.

A strain compatibility method is based on the strain compatibility approach proposed by AISC (American Institute of Steel Construction, Inc.). The strain compatibility method assumes a linear strain of all the members. After that, set up the equilibrium equations of the state of stress in each component for calculating the location of the neutral axis of the cross-section in the presence. In this study, the reinforced concrete simple beam is analyzed by strain compatibility method for calculating the neutral axis and the bending moment. And then, a variation of neutral axis of the reinforced concrete simple beam is measured.