It is important to grasp mechanical and thermal properties in order to verify the possibility of thermal cracking. In this study, for the purpose of improving the accuracy of analysis in prediction of cracking caused by thermal stress, it was investigated that the direct tensile strength and thermal properties considering temperature history inside concrete member may be applied as a design values for the analysis of prediction of cracking caused by thermal stress. From results of these experiments, in early age, the direct tensile strength under mass curing which is considered temperature history inside concrete member is higher than the splitting tensile strength under standard curing. Which is cured under water of 20°C. However, the direct tensile strength under mass curing is lower than the splitting tensile strength under standard curing after 7 days. At 28 days, the strength of former was about 20% lower than that of latter. In this study, the estimated formula on the strength development of the direct tensile strength was proposed. And the thermal expansion coefficient was estimated using measured values of strain and temperature. In this paper, it was reported that the test method of direct tensile strength considering temperature history inside concrete member was proposed and that the accuracy of analysis for the prediction of thermal cracking by using this method would be improved.
This paper conducted earthquake response analysis of reinforced concrete buildings designed by Lateral Load Carrying Capacity provided by current code considering the precise site amplification effect. The total number of site was 118 in Metropolitan area. The paper also discussed the seismic performance of buildings systematically from the viewpoint of site class, structural characteristic factor, height of buildings, etc… based on the analytical results. Finally, the paper concluded that the seismic performance of the buildings greatly differ for each site, and presented the map which showed the ratio of the response drift angle to the limit drift angle for each site.
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