JPKIC 结构设计原理 Teprimepledstmicturgdesign ●Shear capacity: Stayed mainly due to destruction of the principal tensile stress exceeds the tensile strength of concrete,so the beam shear capacity is very low,failure load is equal to or slightly above the main diagonal crack appeared in the load. Destruction of nature:brittle failure
Stayed mainly due to destruction of the principal tensile stress exceeds the tensile strength of concrete, so the beam shear capacity is very low, failure load is equal to or slightly above the main diagonal crack appeared in the load. ⚫ Destruction of nature: brittle failure. ⚫ Shear capacity:
JPKIc 结构设计原得 (2)shear compression failure(shear failure is the diagonal section of the most common type of failure mode) ●Produce conditions: b)剪压破坏 Typically occurs when the moderate shear span ratio is 1 s m s 3 of the beams without web reinforcement Faiure: Bending beam shear diagonal crack appeared in section,with the load increases,cracks start to appear and a few oblique,one of which developed into a critical diagonal crack.Critical diagonal crack appears,can continue to increase load beam,diagonal cracks extended to the load plate,until the diagonal crack to the top of the concrete in the normal stress and shear stress to be crushed under the action of the destruction,the damage is called shear pressure Damage (shear pressure area crushed)
(2) shear compression failure (shear failure is the diagonal section of the most common type of failure mode) b) 剪压破坏 F Typically occurs when the moderate shear span ratio is 1 ≤ m ≤ 3 of the beams without web reinforcement ⚫ Produce conditions: ⚫ Faiure: Bending beam shear diagonal crack appeared in section, with the load increases, cracks start to appear and a few oblique, one of which developed into a critical diagonal crack. Critical diagonal crack appears, can continue to increase load beam, diagonal cracks extended to the load plate, until the diagonal crack to the top of the concrete in the normal stress and shear stress to be crushed under the action of the destruction, the damage is called shear pressure Damage (shear pressure area crushed)
JPKIC 结构设计原理 Teprimepledstmicturgdesign ●Shear capacity: Mainly concerned with the concrete strength,shear strength of its destruction than stayed high. ●Damage to nature: a brittle failure,but stayed its destruction than the failure process is slow, brittle extent eased
Mainly concerned with the concrete strength, shear strength of its destruction than stayed high. a brittle failure, but stayed its destruction than the failure process is slow, brittle extent eased. ⚫ Shear capacity: ⚫ Damage to nature:
JPKIc 结构盘注原黑 (3)diagonal compression failure ●Produce conditions: c)斜压破坏 When the shear span is relatively small (m <1) ●Faiure: In between loading point and the bearing of a diagonal crack,and then roughly parallel to the occurrence of certain section of the ramp cracks.Beam tilt belly divided into several small cylinder.As the load increases,the beam concrete prism abdominal similar situation has been crushed,that destroyed more inclined cracks and dense,but not the main crack,it is called baroclinic damage
(3) diagonal compression failure c） 斜压破坏 ⚫ Produce conditions: F When the shear span is relatively small (m <1) ⚫ Faiure: In between loading point and the bearing of a diagonal crack, and then roughly parallel to the occurrence of certain section of the ramp cracks. Beam tilt belly divided into several small cylinder. As the load increases, the beam concrete prism abdominal similar situation has been crushed, that destroyed more inclined cracks and dense, but not the main crack, it is called baroclinic damage
JPKIC 结构设计原理 Teprimepledstmicturgdesign ●Shear capacity: Capacity of Shear component section depends on the size and concrete compressive strength,shear strength higher than the shear compression failure. Destruction of nature:the case of brittle failure In addition to the three major failure modes,but sometimes may occur locally or vertical compression reinforcement anchorage and other damage
Capacity of Shear component section depends on the size and concrete compressive strength, shear strength higher than the shear compression failure. ⚫ Destruction of nature: the case of brittle failure In addition to the three major failure modes, but sometimes may occur locally or vertical compression reinforcement anchorage and other damage. ⚫ Shear capacity: