Chapter 11 Arch,Suspension and Shell Systems 11.1.Arch Systems 11.2.Suspension Systems 11.3.Shell Systems 11.4 New Spatial Structures
Chapter 11 Arch, Suspension and Shell Systems 11.1. Arch Systems 11.2. Suspension Systems 11.3. Shell Systems 11.4 New Spatial Structures
11.1.Arch system To optimize the dead weight efficiency, the shape is better to coincide to its pressure resultant,such as parabolic arch or catenary line. Idealistic arch/suspension shape is equivalent to moment diagram
11.1. Arch system To optimize the dead weight efficiency, the shape is better to coincide to its pressure resultant, such as parabolic arch or catenary line. Idealistic arch/suspension shape is equivalent to moment diagram
Fig.11-5 Line of pressure and arch moment V 4Hx(L-x) H- L x (a)竖向均布荷载 (b)垂直于拱轴的均布荷载 (a)中心集中荷载 (b)竖向偏心分布荷载
Fig.11-5 Line of pressure and arch moment H H q 4 H L x y y L2 x ( L x) L y x 2 L y x F x y (a)竖向均布荷载 (b)垂直于拱轴的均布荷载 (a)中心集中荷载 (b)竖向偏心分布荷载 q
Fig.11-1 Beam,arch and suspension system (Idealistic arch/suspension shape is equivalent to moment diagram) 业业业Y IDEALISTIC ARCH SHAPE GIVEN BY BEAM: MOMENT DIAGRAM RISE二DARCH C SECTION M-ARM IS SMALL BEAM BEAM 二=很===二>c=三三==二= SAG=h % IDEALISTIC S元NS1ON SUSPENSION SHAPE GIVEN BY MOMENT DIAGRAM NOTE THAT THC "IDEAL"SHAPE FOR AN ARCH OR SUSPENSION SYSTEM IS EQUIVILENT TO IHE DESIGN LOAD MOMENT DIAGRAM
Fig.11-1 Beam,arch and suspension system (Idealistic arch/suspension shape is equivalent to moment diagram)
Fig.11-5 Line of pressure and arch moment y ↓Vy↓yyb PRESSURE-LINE乙、之二 M IN ARCH =He ARcH AKIS UNDER(NON-UNIFORM）∠ Wp +WL H-> BEAM =HA (W2+4N) (2+4WL)
Fig.11-5 Line of pressure and arch moment
Fig.11-6 Arch stiffened with girder or truss H形截面 竖向加劲板 拱肋 水平加劲支撑 桁架加劲拱肋 (a)拱肋竖向加劲 (b)水平加劲支撑 (c)波形拱加劲拱形屋面
Fig.11-6 Arch stiffened with girder or truss H形截面 竖向加劲板 桁架加劲拱肋 拱肋 水平加劲支撑 ( a )拱肋竖向加劲 ( b )水平加劲支撑 ( c )波形拱加劲拱形屋面
Fig.11-7 Arch rib horizontally stiffened by bracing 虚请大培
Fig.11-7 Arch rib horizontally stiffened by bracing
How to balance the kick of arch? 拱 拉索 拱 基础梁 拱 基础 拉索 (a)支座直接承受 (b)加入拉杆 77 (c)加大刚度的边支撑结构
How to balance the kick of arch? 基础 基础梁 拱 拱 拉索 拱 拉索 ( a ) 支座直接承受 ( b ) 加入拉杆 ( c ) 加大刚度的边支撑结构
11.2.Suspension Systems As reverse to arch rib,the advantage of suspension system is fully utilizing material property in tension. The suspension system is more efficient than arch system because there is no buckling problem in suspension
11.2. Suspension Systems As reverse to arch rib, the advantage of suspension system is fully utilizing material property in tension. The suspension system is more efficient than arch system because there is no buckling problem in suspension
Fig.11-12 Typical suspension bridge system (a) STIFFENING TRUSS OR GIRDER PIERS ANCHOR A (b) 个 TCABLE, EMA =0 H← V山w女↓ HA =w 2 4 H= wL 8·
Fig.11-12 Typical suspension bridge system