Analysis Method Of Construction Process And Creep Shrinkage Effects In Mega-Frame Structure

With the development of the modern tall buildings, a new-structure named mega structure which belongs to super high-rise building structure system is emerged in recent twenty years. It is consisted of primary structure and secondary structure. It has excellent whole stability and great performance and is considered one of the most economic structural systems through some projects' contrast.At present some new theories about mega-frame are put forward with the mega-frame composite system betaken in every places of the world. But most people adopt complete loading structural analysis which don't consider the special characteristic during it's being constructed when they analyze the vertical load effects of tall building mega-frame. So it's very necessary to study the difference between "structural analysis of mega-frame structure under complete loading" and "structural analysis of mega-frame structure simulating the construction process" in designing and constructing mega-frame building. The study on the mega-frame structure in this paper is focused on the following aspects.Firstly based on the methods available at present to determine the vertical load effects of tall building, a mechanics model and a computing mean which simulating construction process are presented for mega-frame structure in this paper confined in elasticity. When we establish these models, the characteristic of mega-frame and three kinds of construction processes about mega-frame are taken into account. A corresponding computer program was designed about this computing mean. Through calculating a 12-storey mega-frame, some of important conclusions are presented.Secondly a simplified creep and shrinkage analysis method of mega-frame structures is presented. This method is based on the theory about creep and shrinkage analysis of tall frame structures that is put forward in B.S.Smith's book"analysis and design of tall building structural". This method makes the mechanics model and the computing mean more approached to the reality. A corresponding computer program is also designed for this theory. Through calculating a 12-storey mega-frame, some conclusions about creep and shrinkage of mega-frame simulating construction process are brought forward.In the end of this dissertation, on the basis of theoretical analysis about mega-frame and some mega-frame building, some advices are put forward for design...