Comparison of Steel Tube Concrete Column with Steel Tube Concrete Composite Column Name:于海燕 ID Number:1130598 Column occupies an important position for the structural engineers,as a kind of important component in architectural structures.For high-rise buildings,although structure systems are divers,columns are still essential vertical bearing components and lateral resistance components And,the form has being changed,from the normal reinforced concrete column,a steel reinforced concrete column,steel tube concrete column,to the composite column,mega columns.This report only introduces the related contents concerning concrete filled steel tube(CFST)column and concrete filled steel tube composite column(hereinafter referred to as the composite column). 1.BASIC CONCEPT 1.1 Concrete filled steel tube column:filling the high strength concrete into the steel pipe,is an economic efficient way to overcome the high strength concrete brittleness,by combining steel tube concrete technology with high strength concrete technology.This is because:1)steel tube's hoop constraint effect to core high strength concrete can effectively overcome the high strength concrete brittleness;2)steel tube can be used as a template,and has both longitudinal reinforcement and the transverse stirrup function,and facilitates to place high strength concrete, especially can use advanced pump concrete pouring process,because inside steel reinforced skeleton is not needed;3)without concrete cover outside,makes full use of the capacity of high strength concrete. 1.2 Composite column:consists of the core CFST and the concrete outside,can be as square section rectangular section or circular cross section.Composite column inside and outside parts can be constructed in different period,or in the same period.Construction in different period means first casting inside concrete to form CFST,bearing part of the vertical load during the period of construction then the outside concrete.Construction in the same period means casting the inside and outside concrete at the same time. The comparison shows that both consist of high strength concrete and steel tube,and the hoop sets effect gives full play to the role of high strength materials.The main difference is that, no concrete cover outside the CFST but composite column RC outside the pipe,also the inside and outside concrete can be casted in different periods.In short,CFST composite column is the development of concrete filled steel tube column 2.BUILDING MAXIMUM HEIGHT The second and third class high-rise building maximum height using composite column structure,for frame structure and 9 degree seismic fortification,is the same with A level heightComparison of Steel Tube Concrete Column with Steel Tube Concrete Composite Column Name: 于海燕 ID Number: 1130598 Column occupies an important position for the structural engineers, as a kind of important component in architectural structures. For high-rise buildings, although structure systems are divers, columns are still essential vertical bearing components and lateral resistance components. And, the form has being changed, from the normal reinforced concrete column, a steel reinforced concrete column, steel tube concrete column, to the composite column, mega columns. This report only introduces the related contents concerning concrete filled steel tube (CFST) column and concrete filled steel tube composite column (hereinafter referred to as the composite column). 1. BASIC CONCEPT 1.1 Concrete filled steel tube column: filling the high strength concrete into the steel pipe, is an economic efficient way to overcome the high strength concrete brittleness, by combining steel tube concrete technology with high strength concrete technology. This is because: 1) steel tube’s hoop constraint effect to core high strength concrete can effectively overcome the high strength concrete brittleness; 2) steel tube can be used as a template, and has both longitudinal reinforcement and the transverse stirrup function, and facilitates to place high strength concrete, especially can use advanced pump concrete pouring process, because inside steel reinforced skeleton is not needed; 3) without concrete cover outside, makes full use of the capacity of high strength concrete. 1.2 Composite column: consists of the core CFST and the concrete outside, can be as square section, rectangular section or circular cross section. Composite column inside and outside parts can be constructed in different period, or in the same period. Construction in different period means first casting inside concrete to form CFST, bearing part of the vertical load during the period of construction, then the outside concrete. Construction in the same period means casting the inside and outside concrete at the same time. The comparison shows that both consist of high strength concrete and steel tube, and the hoop sets effect gives full play to the role of high strength materials. The main difference is that, no concrete cover outside the CFST but composite column RC outside the pipe, also the inside and outside concrete can be casted in different periods. In short, CFST composite column is the development of concrete filled steel tube column. 2. BUILDING MAXIMUM HEIGHT The second and third class high-rise building maximum height using composite column structure, for frame structure and 9 degree seismic fortification, is the same with A level height