Corrugated web box-section steel-concrete combined arch

Abstract

Belonging to the field of structural engineering, the invention relates to a corrugated web box-section steel-concrete combined arch. The combined arch is characterized in that it is formed by direct butt welding of two corrugated web H-shaped section steel arches through an upper flat flange plate and a lower flat flange plate along the arch axis direction; and concrete is poured into the box-section to form a steel tube concrete combined arch structure. The corrugated web H-shaped section steel arches have a biaxial symmetric H-shaped section or uniaxial symmetric H-shaped section, and the corrugated web is a trapezoidal zigzag steel plate or sinusoidal wave steel plate. The combined arch provided by the invention is a large span space structure member with superior overall mechanical performance, and has the characteristics of convenient manufacturing, clear labor division of section stress. The box-section has strong torsional stiffness and arch axial out-of-plane flexural rigidity. The restraint function provided by the corrugated web improves the compressive strength and ductility of core concrete, and the supporting effect provided by the core concrete strengthens the local stability of the corrugated web and the flange plates.

Description

technical field [0001] The invention relates to a corrugated web box section steel-concrete composite arch, which belongs to the technical field of structural engineering. Background technique [0002] Under the action of vertical load, the support of the arch structure generates horizontal thrust. With its curved arch axis, the bending moment is converted into axial pressure and the span of space is realized, so it is also called "thrust structure". Steel arches are widely used in long-span space structures and bridge structures because of their light weight, high material strength, good tensile properties, and quick and convenient construction and installation. At present, the steel arch structure in engineering is usually a flat-web I-shaped section or a box-shaped section, which has the following two problems in actual design and construction: (1) When the section height of the flat-web steel arch is large, in order to prevent the web If the plate buckles prematurely un...

AI Technical Summary

Problems solved by technology

At present, the steel arch structure in engineering is usually a flat-web I-shaped section or a box-shaped section, which has the following two problems in actual design and construction: (1) When the section height of the flat-web steel arch is large, in order to prevent the web Premature local buckling of the plate under the action of axial compressive stress or shear stress requires a large plate thickness or a large number of stiffeners, resulting in inconvenient processing and waste of materials

(2) During the manufacture of the flat web steel arch, since it is difficult to bend the flat web of the cross-section in the plane of the arch axis, it is often used to directly cut the steel plate in an arc and tailor weld it into shape, which requires a large A flat steel plate is cut according to the arc shape, resulting in a lot of waste of leftover materials

[0004] However, since the above-mentioned wavy web steel arch structure is an I-shaped section, its section bending stiffness and section torsional stiffness outside the arch axis plane are significantly smaller than the section bending stiffness inside the arch axis plane, so when applied in the stadium In large-span structures such as bridges, the out-of-plane bending and torsional instability of the steel arch will first occur due to insufficient support outside the plane, and the bearing capacity is low

On the other hand, although the local buckling performance of the wavy web in the section is significantly improved due to the influence of the wave shape, the upper and lower flat flanges are still prone to local instability under the compressive stress generated by the axial force and bending moment, so The width-to-thickness ratio of the flange plate needs to be strictly limited, resulting in a larger plate thickness of the flange plate

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