摘要
为了探究先张法预应力混凝土构件的混凝土强度变化对预应力传递长度的影响规律,论文对实际工程中不同张拉系数与放张强度时预制梁预应力的传递长度进行计算,并且对各试验构件传递长度进行实测。结果表明,采用先张法施工的构件的预应力传递长度与预应力筋张拉系数、混凝土放张强度成正比;修正公式计算结果与实测结果拟合度较高,修正公式可作为先张法预应力构件提早放张时预应力传递长度的计算公式。
In order to explore the law of the influence of the change of strength of pretensioned prestressed concrete members on the transmission length of prestressed concrete members,the paper calculates the transmission length of prestressed prestressed beams under different tension coefficient and tension strength in practical engineering,and conducts measurement of the transmission length of each test member.The results show that the length of prestress transfer is proportional to the tensile coefficient of prestressed tendons and the tensile strength of concrete.The results of the modified formula fit well with the measured results.The modified formula can be used to calculate the length oftheprestressed member when the pretensioned member is released in advance.
作者
李星宇
LI Xing-yu(School ofCivil Engineering and Transporation Engineering,Beijing University ofCivil Engineering and Architecture,Beijing 100044,China)
出处
《工程建设与设计》
2023年第16期5-7,共3页
Construction & Design for Engineering
关键词
混凝土构件
先张法
放张强度
张拉系数
传递长度
concrete member
pretension
tensile strength
tension coefficient
transfer length
