The authors propose two kinds ofco 駆 crete rec 丘 angul 団r s紅 ess blocks to be us { ゴ d fbr fiexu 囮 】capacity eval 眦 ation ofhigh streng 吐幽 conc 盻 te columus up Io 180 Nlmm2 正 n concrete comprcssivc strength . O 冂 o is fbr血 e first peak capacity wher ¢ the oo ▼e τ conorete spalls off , and 虚 hc oth ¢ r is董 br thじ second p 巳ak capacity , fbllowing the first peak, GalG "lated based on the core area . The calculation r6sults using these stress blooks show good agreement with th ¢ t己 st r ∈su [ ts which were obtailled f 「 om high strength concrete colurnns tested under fiexural comp 【ession , Th じ evaloation by the stress block was fbund useful for structural d唱sig 乢 K のy "}orcts : high strength cOncrete , reinforced eonc 昭 te cotumn , . t7exural strength , streSS b ' ock , conf } ned eoncrete
Cyclic loading experiments on Lead Rubber Bearing (LRB) with large diameter lead plug were performed. Four-size LRB specimens which had almost identical shape factors were used. Effects of temperature and scale on LRB properties were examined based on one-direction loading tests. In addition, behavior under two-direction loading was compared with one under one-direction loading. The relationship between temperature and yield stress of lead plug was derived from temperature measured by using thermocouples installed in the center of lead plug. Heat conduction analysis using the relationship can predict force and temperature of lead plug with high accuracy.
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