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在预应力混凝土梁中,预应力值是否符合设计要求将直接影响结构的可靠性及使用寿命,因此,在预施预应力过程中,目前国内外大部分采用测力装置及伸长量双控制,以保证安装应力的可靠。对于预应力的允许误差,国内外基本一致采用相对值的5%作标准;而对伸长值的相对允许误差,则并不统一。由于预应力筋伸长量受许多因素的影响,其理论真值(此处理论真值指在某一特定条件下,预应力筋伸长量这一随机变量的数学期望值)同实测
In the prestressed concrete beam, whether the prestressed value meets the design requirements will directly affect the reliability and service life of the structure. Therefore, most of the prestressed prestressed concrete beams at home and abroad are equipped with force-measuring device and double elongation control , To ensure the reliability of installation stress. For the allowable error of prestress, the same is true at home and abroad using 5% of the relative value as the standard; while the relative allowable error of elongation is not uniform. Since the elongation of prestressing tendon is affected by many factors, its theoretical true value (which means the mathematical expectation of the elongation of prestressing tendon under a certain condition) is the same as that measured