1 Steel composite arch rib using first prestressed steel composite arch rib

摘要

The present invention relates to a rigid composite arch rib (1) in which a primary prestress rigid composite arch rib (8) in which a prestress is introduced into an I-beam arch rib (A) constituting an arch structure is connected and assembled. When the uniform load (total arch rib load) acts on the two-hinge arch structure, the bending moment occurs in approximately three equal parts. In this case, the maximum bending moments for each section are M ₁ , M ₂ , and M _3. If the concrete is placed on the I-shaped steel arch ribs (A) and the concrete is placed on the I-shaped steel arch ribs (A), the upper part of the I-shaped steel arch ribs (12) And the lower flange (13) , , Residual stress of is left. At this time, there is a difference in the stress state of the upper part 12 and the lower flange 13 of the I-shaped steel arch ribs due to the bending moment, so that the concrete placed on the I-shaped steel arch ribs A and the arch ribs When it is synthesized, the homogeneous residual stress state does not occur in the I-beam arch ribs, which may adversely affect the synthesizing action. Thus, the homogeneous residual stress states in the upper and lower flanges of the I-beam steel rib ribs 12 and 13 to be I when introducing prestressed in section steel arch ribs (a) the bending moment acting on the arch structure M _1, M _2, the bending corresponding to the M ₃ moment M1 ', M2', M3 ' (Pf 1, Pf ₂ , Pf ₃₎ is introduced into the I-shaped steel arch ribs (A) to fabricate the primary prestressed rigid composite arch ribs (8), and then assemble and mount them to complete the rigid composite arch ribs (1). Composite Arch Rib (1) When pouring concrete in the bending moment caused by _{Pf 1, Pf 2, Pf 3} M 1 ', M 2', M 3 ' Rahal when the first prestressed steel composite arch rib top 6 and the lower flange 7 Stress is , , The bending moment caused by the concrete pouring on the rigid composite arch rib 1 and the bending moment caused by the preflection load by the introduction of the prestress are offset each other, and the rigid composite arch rib 1 becomes a homogeneous compressive stress state. Synthesis with concrete poured on the rigid synthetic arch ribs 1 is made efficiently and integrated and behaves. In order to ensure that the concrete poured on the composite arch ribs 1 behaves integrally, a deck plate 2 is installed on the lower composite concrete ribs 5 and the concrete on the rigid composite arch ribs 1 is completed. Pour it. At this time, the shear connecting plate (3) is fixed to the abdominal steel plate (4) of the composite arch rib (1) for the complete synthesis of the concrete composite rib (1) and the concrete (1a) placed on the composite composite arch rib (1) Placed at intervals to ensure complete synthesis.