Study On Temperature Stress And Design Method Of Expansion Reinforcing Strip In Concrete Frame Structure

At present,over-long building is becoming very popular.By requirment of their functions,expansion and contraction joint is not supposed to be located or at least frequently located in over-long building.If not properly tackled,the temperature deformation and temperature stress in over-long reinforced concrete structure building may cause the cracks and may even affect the normal operation of the structures,if worse,Study the code for design of the concrete structures, temperature variations are even not taken into consideration in over-long building.Just only some construction treatments considered.Therefore,temperature problem is one of vitally important research topics in structure designing of over-long building.Now the installing of expansion reinforcing strip is a new design-construct way to prevent crack caused of temperature in the foundation work.But the way also faces many problems such as selecting of expanding agent,settlement of confined expansion ratio,collocation of expansion reinforcing strip,setting of breadth of expansion expansion reinforcing strip and so on.These problems directly influence the use of expansion reinforcing strip in the engineering.The paper launchs to research on the condition of the background,temperature reaction of real structure with two story model is imitated on the condition of bearing temperature load through simplifying rationally real structure,what's more, temperature reaction on the Condition of Different Side-displacement Rigidity,structural length and slab thickness are researched through analysis of finite element program of ANSYS.Firstly whole deform and side displacement law of frame structure are obtained on the condition of two temperature load,and temperature stress and displacement are studied. Secondly distribution feature and law of the temperature stress of slab in frame structure on the condition of different Side-displacement Rigidity,structural length slab thickness are obtained;ln the end temperature stress of slab is gone on regression analysis on the basis of result of orthogonal test. Then simplified computation formula of the maximum temperature stress in the slab is obtained on the condition of three temperature loads in frame structure and the fitting formula is tested through the practicable engineering.In the paper,frame struction setted up expansion reinforcing strip is simulated with finite element method .The temperature stress and displacement of the slab added expansion reinforcing strip is analyzed and the relationship of it's setting location and width affecting to structural internal force and displacement is studied.and so is studied to the relationship of its width and numbers. It is meaningful for the structure design.