Structural Analysis & Program Implementation Of Prestressed Concrete Structures Considering Construction Factors

We often have the assumption that the whole building has already exist when doing structural analysis, while prestressing forces and dead loads that are mainly composed of its self-weight are often applied step by step during the construction process. Sometimes the answer we obtained under this assumption will far from the truth because it does not match the actual instance.To meet the requirements of the national codes and specifications, this article detailedly depicted some common used simplified calculation models from the point of structural analysis, and more reasonable models according to its construction process are put forward. Corresponding programs have also been made based on PKPM softwares. Customers can choose different models according to different projects by applying newly functions, when analyzing the structure, so as to obtain relative precise answers. Meanwhile, to provide customers with conveniences, the program for the checking of prestressed concrete structures during construction process, as well as non-prestressed concrete column' s distributed steel program that can consider the effect of secondary forces have been made.The main achievements of this dissertation are explained as the following:1) The function with secondary internal force consideration was added in the distributed steel program of non-prestressed concrete column, as well as the influence of prestessed concrete structure' s analysis and design caused by lateral constrains is deeply discussed. By the given example, we can get the conclusion that sometimes the structure will be not safe enough if not considering the secondary forces caused by prestressing force when designing concrete columns.2) Several simplified calculation models under prestressed force are present in this paper, more reasonable calculation models according to the real condition of its construction order have been put forward, and corresponding computation program is made as well. The necessity of simulated calculation has been pointed out after comparing the answers of different calculation models under prestressing force.3) Some structural analysis models that can take the post-cast belt into account have been put forward under some assumptions, and corresponding program has been made. By the given example, we can know that sometimes the effect of post-cast belt can' t be neglect when doing structural analysis.4) A checking program of prestressed concrete structures during construction is made in terms of its practical construction scheme. The answers obtained by this program have also been checked.5) Corresponding simulated calculation model under dead loads, according to its actual construction project, is presented in this paper and related program had...