Abstract：
Attenuation degree of cable strength during tensioning is an important factor in tensile control. Based on characteristics and difficulties of prestressed beam string structure, the engineering software Midas is used for numerical simulation of the whole construction process, so as to analyze variation of internal force and displacement of structure, determine reasonable construction sequence, point out technical parameters which shall be controlled during construction and adopt relevant technical measures. The prestressing tensioning construction of beam string roof is smoothly finished and construction quality is successfully accepted.
