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10.7.1 概论由于给与予加应力(prestress),可使梁或板的有效长增长。使用高拉力软钢丝绳 (strand)将后加拉力(post-tension)应用于地下连续墙。由于这些就是在平均厚度为700～900mm的连续墙上,没有支撑工程的悬臂梁长度,在墙的变位容许情况下,最大可达9m。由于将予加应力应用于地下连续墙,对混凝土给与压缩应力,以此来平衡载荷时混凝土部分的或全部产生的拉应力,这样在很大程度上可以减少弹性变位。
10.7.1 Introduction Due to prestressing, the effective length of a beam or slab can be increased. The post-tension is applied to the underground diaphragm wall using a high tension soft steel strand. Since these are continuous walls with an average thickness of 700-900 mm, there is no support for the cantilever beam length, and up to a maximum of 9 m in the case of wall deflection. Because the prestressing is applied to the diaphragm wall, compressive stress is applied to the concrete to balance the tensile stress of the concrete part or all of the load, so that the elastic displacement can be reduced to a large extent.