JPKIC 结构设计原理 Tfeprniipledistnctiredesign S9.2 Transformed section s9.2.1 Basic assumptions of the sessionⅡ： Plane-section assumption Elastic assumptions(pressure zone similar to a linear distribution of concrete) Tension zone does not bear the tension.By Reinforcement under tensilestress fully
§9.2 Transformed section §9.2.1 Basic assumptions of the session Ⅱ : ⚫ Plane-section assumption ⚫ Elastic assumptions (pressure zone similar to a linear distribution of concrete) ⚫ Tension zone does not bear the tension. By Reinforcement under tensilestress fully
JIPlKIC 结构计原黑 s9.2.2 Transformed section ●Definition: Will be mixed with soil reinforcement and the actual cross- section composed of two materials are translated into a hypothetical tensile and compressive properties ofmaterials composed of the same section of the transformed section homogeneous
§9.2.2 Transformed section ⚫ Definition: Will be mixed with soil reinforcement and the actual crosssection composed of two materials are translated into a hypothetical tensile and compressive properties ofmaterials composed of the same section of the transformed section homogeneous
JPKIC 结构设计原理 jhepnhepledstucturedesgn Conversion principle The joint force,deformation compatibility. A,=Ac Asc=As Os= Es s E Ec (Plane-sectionAssumptionc=&s) Where :A -Reinforcing syeel area -Converted into an imaginary cross-sectional area of concrete in tension =E,/E。 Section of reinforced concrete conversion factor Equal to the elastic modulus ratio
⚫ Conversion principle ：The joint force, deformation compatibility. As s = Asc c c s E s s c c s s s c s s c s A E E A A A = = = (Plane-section Assumption ) c s ∴ = = EsAs ∵ As Where ： Asc Es = Es Ec — Reinforcing syeel area — Converted into an imaginary cross-sectional area of concrete in tension — Section of reinforced concrete conversion factor Equal to the elastic modulus ratio
JPKIC 结构设计原理 The principle of structure design $9.2.3 Cracking section of the transformed section Definition Reinforced concrete flexural members work force into the first stage II(with cracksession),it is often assumed that tensile zone of concrete tensile stress completely,by the reinforcement to withstand tensile stress.Area of the concrete compression zoneand tension zone of reinforced area which consists of translation known as thereinforced concrete section cracking section of the transformed section
§9.2.3 Cracking section of the transformed section ⚫ Definition ：Reinforced concrete flexural members work force into the first stage Ⅱ (with cracksession), it is often assumed that tensile zone of concrete tensile stress completely, by the reinforcement to withstand tensile stress. Area of the concrete compression zoneand tension zone of reinforced area which consists of translation known as thereinforced concrete section cracking section of the transformed section
JPKIC 结构设计原理 jhepnihepledstucturedesgn Geometric properties >Conversion section in the face of neutral axis static moment: Ao=bx+Ayc bx+aEsAs >Cracking section area of Transformed section Compression zone =bx 2 Tension zone Su=cA(-x)
⚫ Geometric properties ➢Cracking section area of Transformed section : A0 s c EsAs A0 = bx + A = bx + ➢Conversion section in the face of neutral axis static moment: 2 0 2 1 S bx c = Tension zone S A (h x) t Es s = − 0 0