Response Analysis Of Super-long Structure Under Temperature Effect And Jointless Design Research

With the rapid development of urban construction,all kinds of large-scale buildings have appeared frequently.Structures are not only super-high in high altitudes,but also super-long in the horizontal direction.The monomer length of structures without expansion joints have been expected more and more longer,and thenjointless design of super-long structure have been proposed by engineers. Today, the jointless design of super-long structure has been rapidly developed in modern architecture,and good economic and social benefits have been achieved.For example, the service function,elevation configuration and symbolic significance of buildings have been satisfied;The issues such as durability,fire resistance,water tightness and maintenance by setting deformation joint have been overcomed;The layout of equipment and pipelines become convenient;It is more beneficial to structural seismic;To avoid serious torsion damage effect in that stiffness center and centroid of structure units between the deformation joint don't coincide;and so on.The jointless design of super-long structure brings many benefits.However,the temperature stress of super-long structure caused by temperature variation are often the main reason for crack formation,therefore,it is inevitable to analyse the temperature effect of structure.Today,the research of temperature effect of super-long structure don't have a lot,basically based on experience.In this paper,at first the possible temperature conditions of the structure had been calculated by a certain temperature load calculation methods(linear distribution method)by refering to some literature;Next,based on the engineering background of ZhengZhou New Train Station,using its ANSYS finite element model,and not considering the effect of the gravity and extermal load,and only considering temperature effect,and only considering the elastic deformation of materials,the temperature effect of structure in different temperature conditions had been analysed by calling linear static analysis module in the finite element program,and the deformation and internal force(or stress)of the main stressed member (beam,plate,column)had been analysed,thereby the most unfavorable condition and weak parts of the structure had been made sure;At last,the technical measures of jointless design of super-long structure had been discussed,some suggestion of strengthening local structure for this project had been proposed,and a theoretical basis had been established to provide reference for the practice of other projects. The following conclusions had been got through the analysis of temperature effect(1)Under the same constraints, when the same component have big temperature variation,its deformation and internal force are big, when the same component have small temperature variation,its deformation and internal force are small; Deformation of structural members gradually become larger with the structure height increasing, internal forces of structural members gradually become smaller with the structure height increasing.(2)The maximum internal force of the main stressed member (beam,plate,column) have appeared in the platform layer; The mininum internal force of the main stressed member (beam,plate,column) have appeared in the roof layer.(3)The fourth condition had been made sure as the most unfavorable condition through comparison of different conditions. Taking into account the shrinkage of concrete on the structure of the negative impact,the retention time of post-pouring zone in the platform layer should be extended as. long as possible,and the close time of the post-pouring zone shall be arranged in the spring and autumn with lower temperature.