Composite Steel-Concrete Shear Walls By Professor Chen Shiming 2015
By Professor Chen Shiming 2015 Composite Steel-Concrete Shear Walls
1.Introduction Quite a number of Super High-rise buildings have been built in the recent years in metropolis of China.Majority of these buildings are in the form of composite structure. Buildings constructed in composite manner ▣ Single-Tower type structures Multi-Tower type structures Sectional-mixed structures (Lower floors in RC/upper in composite)
1. Introduction • Quite a number of Super High-rise buildings have been built in the recent years in metropolis of China. Majority of these buildings are in the form of composite structure. • Buildings constructed in composite manner Single-Tower type structures Multi-Tower type structures Sectional-mixed structures (Lower floors in RC/upper in composite)
International Finance Center Tower 1-RC core RC perimeter columns configuration Redevelopment of the Lee Gardens up to 23/F,23/F to 38/F becomes composite Hotel-The Manulife Tower structure with columns slabs in steel
Redevelopment of the Lee Gardens Hotel – The Manulife Tower International Finance Center Tower 1 – RC core + RC perimeter columns configuration up to 23/F, 23/F to 38/F becomes composite structure with columns & slabs in steel
Shanghai Tower in construction
Shanghai Tower in construction
顶高 632m 。顶层 第18层 第116层 巨型柱 图 角柱 玻璃幕墙 第101层 ◆第99层 第84层 第82层 图 第68层 @ 两个楼层高的伸臂 2学 第66层 桁架贯穿核心筒 3 一个楼层高的 ,第52层 径向桁架 第50层 罕 第37层 Y 49254925 第35层 楼板平面范围 图 变化9950T9950变化 第22层 +X 071.6s1224s13.3 第20层 (a)标准层平面图 第8层 第6层 阀板项 图5结构剖面图
Major elements:Core wall Serves as the major load taking element and to provide rigidity to resist deflection caused by lateral load (wind,earthquake loading) Usually formed by mechanical-lifted formwork system such as climb form or jump form Connection provision such as anchor plate for steel beams,build-in bar couplers or starter bar box for slab,and anchor frame for outrigger,will be provided in the core wall during its construction
Major elements: Core wall • Serves as the major load taking element and to provide rigidity to resist deflection caused by lateral load (wind, earthquake loading) • Usually formed by mechanical-lifted formwork system such as climb form or jump form • Connection provision such as anchor plate for steel beams, build-in bar couplers or starter bar box for slab, and anchor frame for outrigger, will be provided in the core wall during its construction
Shear wa ①②④ ⑧ 1200200 40 2800 2300 3300 。A structural sy: AZ2 0p0 panels)to cour structure.Wind 0Z8310Z8 loads that shea 20 of shear walls A encasing an el core. Q15 3300 zhulong.com
Shear wall • A structural system composed of braced panels (or shear panels) to counter the effects of lateral load acting on a structure. Wind and seismic loads are the most common loads that shear walls are designed to carry. A structure of shear walls in the center of a large building—often encasing an elevator shaft or stairwell — form a shear core
The design principles of Ductility Composite structural systems class composite shear walls are a H M included in specific codes- design of composite steel and concrete structures and u in provisions regarding the 41 Type 1 Type 2 design of buildings for Steel or composite Concrete walls re- moment frame with inforced by con- connected concrete nected encased ver- earthquake resistance. infill panels tical steel sections. Three types of composite Type 3 Composite or structural systems are concrete walls coupled u by steel or a defined (earthquake composite beams resistance)in Eurocode 8 Composite steel plate shear walls u =12 Qu part 7.10.(Type 2) a Figure 1.Design concepts and behavior factors
Figure 1. Design concepts and behavior factors. • The design principles of composite shear walls are included in specific codesdesign of composite steel and concrete structures and in provisions regarding the design of buildings for earthquake resistance. • Three types of composite structural systems are defined (earthquake resistance) in Eurocode 8 part 7.10 . (Type 2)
Composite shear walls ◆ Shear wall or core wall is the main lateral force resistant components,where the lateral forces could be induced by wind,by earthquake or combination of the two.The influence of the lateral forces on the building normally varies with the height of building, and therefore their structural requirements rise. Higher axial compression strength,higher ductility and thin structural wall size. Composite wall possesses these three features as compared to the RC shear walls
◆ Shear wall or core wall is the main lateral force resistant components, where the lateral forces could be induced by wind , by earthquake or combination of the two. The influence of the lateral forces on the building normally varies with the height of building, and therefore their structural requirements rise. ◆ Higher axial compression strength, higher ductility and thin structural wall size. ◆Composite wall possesses these three features as compared to the RC shear walls. Composite shear walls
>Steel encased comnosite shear wall 50.70 760 70,50 steel encased profile vertical reinforcement steel encased profile (70x70x5) (010/100) Encased steel pr (70x70x5) CSRCW-1 effectively con shear connector horizontal reinforcement (013/150) 760 (08/150) concrete cracks ir 7050 CSRCW-2 and to enable a be 1000 dissipation r 070 345 0 345 20 Normally the ste CSRCW-3 are encased as 1000 50,70 760 70 elements,which e CSRCW-4 seismic performar 1000 70 860 whole wall Shear CSRCW-5 is used at the sted interface. D.Dan,A.Fabian V.Stoian,Romania
➢Steel encased composite shear wall Encased steel profiles can effectively control the concrete cracks in the wall, and to enable a better energy dissipation mechanism. Normally the steel profiles are encased as the edge elements, which enhance the seismic performance of the whole wall . Shear connction is used at the steel-concrete interface. D.Dan , A.Fabian & V.Stoian, Romania
