CN1273708C

CN1273708C - Steel and concrete continuous beam

Info

Publication number: CN1273708C
Application number: CN 200410051329
Authority: CN
Inventors: 吴波; 马宏伟
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2004-09-06
Filing date: 2004-09-06
Publication date: 2006-09-06
Anticipated expiration: 2024-09-06
Also published as: CN1587574A

Abstract

The present invention relates to a steel arched concrete continuous beam which is composed of a wavy steel framework, or wavy steel pipe concrete, high strength steel bars, or high strength steel wire bundles, vertical steel bars, concrete and hoop bars, wherein the interior wavy steel framework or the wavy steel pipe concrete is connected with the high strength steel bars or the high-strength steel wire bundles so as to form the core stress part of the steel arched concrete continuous beam; the vertical steel bars and the hoop bars are respectively arranged at the periphery, and the concrete is cast at the periphery. The steel arched concrete continuous beam of the present invention can improve the bearing capacity of the beam under the condition of the same steel quantity, or reduce the use level of steel and the concrete under the same bearing requirement so as to achieve the aim of low construction cost.

Description

Steel Shank Concrete Continuous Beam

Technical field

The present invention relates to building structure field, specifically is a kind of Steel Shank Concrete Continuous Beam that can directly apply to conversion layer frame strutbeam in the high building structure.

Background technology

At present, load and stress form thereof owing to conversion layer frame strutbeam in the high building structure are very complicated, if adopt normal reinforced concrete beam, the rebar ratio that general requirements is higher, often cause the reinforcement placement difficulty, also may have the hidden danger of over-reinforced beam brittle fracture simultaneously.

When aforesaid way can't satisfy bearing capacity or rigidity requirement, often adopt steel framed concrete beam to improve bearing capacity to reach, reduce the purpose that brittle fracture takes place in the engineering.Yet the steel using amount of steel framed concrete beam is bigger, and near the reinforcing bar the natural axis is not given full play to the mechanical property of its material as yet simultaneously, causes bigger waste of material.

From mechanical mechanism, the upper chord of vertical uniform load q lower link arch (or bracing-cable arch) mainly bears pressure, and the horizontal thrust of arch generation is simultaneously then born by pull bar (or drag-line).Because the existence of this horizontal thrust, the moment of flexure at arch structure arbitrary section place is general all less than the moment of flexure of same cross-sectional position in the respective horizontal beam, thereby arch structure generally can realize bigger span and the bearing capacity of Geng Gao, has more obvious economic benefit.

Summary of the invention

In order to solve above-mentioned engineering problem, the object of the present invention is to provide a kind of Steel Shank Concrete Continuous Beam.Adopt Steel Shank Concrete Continuous Beam, can under the condition of same steel using amount, improve the bearing capacity of beam, or under same requirement for bearing capacity, reduce steel and concrete amount, reach the purpose that reduces construction costs.

Steel Shank Concrete Continuous Beam of the present invention, its main part are undaform pull bar arch or the bracing-cable arch that is connected to form by undaform reinforcing bar or undaform concrete filled steel tube and reinforcing bar or steel tendon; Longitudinal reinforcement and stirrup are placed in periphery at undaform pull bar arch or bracing-cable arch, and the monobloc cast concrete.

Described undaform reinforcing bar or undaform concrete filled steel tube and reinforcing bar or steel tendon can connect and compose undaform pull bar arch or bracing-cable arch by welding, bolt or rivet.

The present invention is in peripheral concrete configuration reinforcement (comprising vertical muscle and stirrup etc.), Steel Shank Concrete Continuous Beam adopts the main tension members of high tensile reinforcement (or high-strength steel tow) as member, utilize the main pressure-containing parts of undaform reinforcing bar (or undaform concrete filled steel tube) as member, the two is combined to form the clear and definite stressed mechanism of arch formula, most of vertical load that common resistant members is born.Simultaneously, can adopt ripe effectively connected mode such as welding, bolt connection, riveted joint between the two.In addition, because the protection of peripheral concrete, the fire resistance of whole member and corrosion resistance etc. also can obtain satisfying preferably.Owing to given full play to high tensile reinforcement (or high-strength steel tow) and undaform reinforcing bar (or undaform concrete filled steel tube) strong point separately, under same requirement for bearing capacity, its rolled steel dosage is little than the steel reinforced concrete continuous beam.

Compared with prior art, the present invention has following advantage: on mechanical mechanism, utilize the clear and definite stressed mechanism of arch formula, Steel Shank Concrete Continuous Beam can be given full play to the tensile strength of tension high tensile reinforcement (or high-strength steel tow) and the compressive strength of pressurized undaform reinforcing bar (or undaform concrete filled steel tube) simultaneously.Finite element nonlinear analysis result shows that under identical rolled steel dosage condition, with respect to the steel reinforced concrete continuous beam, the bearing capacity of Steel Shank Concrete Continuous Beam generally can improve about 20～30%.Therefore, under the identical prerequisite of steel using amount, adopt the present invention can improve the bearing capacity of beam; Perhaps under same requirement for bearing capacity, can reduce steel and concrete amount, reduce construction costs.Thereby not only engineering demands but also can realize high economic benefit, construction simultaneously is also comparatively convenient, and other also can be guaranteed such as fire resistance, endurance quality etc.

Description of drawings

Fig. 1 is the structural representation of Steel Shank Concrete Continuous Beam;

Fig. 2 is the A-A sectional view of Fig. 1.

The specific embodiment

As shown in Figure 1, 2, the Steel Shank Concrete Continuous Beam of span centre bearing 6 and 5 supports of end bearing is made of undaform reinforcing bar (or undaform concrete filled steel tube) 1, high tensile reinforcement (or high-strength steel tow) 2, longitudinal reinforcement 7, concrete 4, stirrup 8.Its inner undaform reinforcing bar (or undaform concrete filled steel tube) 1 is connected with high tensile reinforcement (or high-strength steel tow) 2 by connector 3; Its periphery disposes longitudinal reinforcement 7 and stirrup 8 respectively, and concreting 4.

The main part of Steel Shank Concrete Continuous Beam, it is the undaform pull bar arch (or bracing-cable arch) that high tensile reinforcement (or high-strength steel tow) undaform reinforcing bar (or undaform concrete filled steel tube) is formed, can carry out finite element analysis according to the load that architectural height and span require and structural analysis obtains, and carry out corresponding detailing according to analysis result; Then, directly carry out prefabricated in element precast factory.In prefabricated process, should be able to guarantee the pouring quality of undaform concrete filled steel tube, and effective connection the between undaform reinforcing bar (or undaform concrete filled steel tube) and the high tensile reinforcement (or high-strength steel tow).Undaform pull bar arch (or bracing-cable arch) is prefabricated finish after, at first undaform pull bar arch (or bracing-cable arch) is in place at the architecture construction scene, then according to the similar preparation method of conventional concrete beam, longitudinal reinforcement and stirrup are placed in periphery at undaform pull bar arch (or bracing-cable arch), and concreting guarantees pouring quality simultaneously.

Certain two span continuous beam is of a size of deck-molding 2m, single span length 6m, be all at the volume steel using amount under 5% the situation, we adopt large-scale general nonlinear finite element software ANSYS respectively steel reinforced concrete continuous beam (annotate: the section form of reinforcing bar is an I shape) and Steel Shank Concrete Continuous Beam to be calculated.Result of calculation shows that the latter can improve the ultimate bearing capacity about 30% of beam.

Claims

1, a kind of Steel Shank Concrete Continuous Beam is characterized in that its main part is undaform pull bar arch or the bracing-cable arch that is connected to form by undaform reinforcing bar or undaform concrete filled steel tube and reinforcing bar or steel tendon; Longitudinal reinforcement and stirrup are placed in periphery at undaform pull bar arch or bracing-cable arch, and the monobloc cast concrete.

2, Steel Shank Concrete Continuous Beam according to claim 1 is characterized in that described undaform reinforcing bar or undaform concrete filled steel tube and reinforcing bar or steel tendon connect and compose undaform pull bar arch or bracing-cable arch by welding, bolt or rivet.