判斷題為減少鋼筋松弛的預(yù)應(yīng)力損失,對(duì)曲線預(yù)應(yīng)力筋和抽芯成孔長(zhǎng)度大于24m的直線預(yù)應(yīng)力筋采用兩端張拉。