CN202116975U

CN202116975U - Subsection prefabrication casing wall for steel fiber concrete

Info

Publication number: CN202116975U
Application number: CN2011201573411U
Authority: CN
Inventors: 孟庆利
Original assignee: Institute of Engineering Mechanics China Earthquake Administration
Current assignee: Institute of Engineering Mechanics China Earthquake Administration
Priority date: 2011-05-17
Filing date: 2011-05-17
Publication date: 2012-01-18
Anticipated expiration: 2021-05-17

Abstract

The utility model relates to a subsection prefabrication casing wall for steel fiber concrete, which comprises a group of prefabrication casing wall sections (2) fixedly arranged on the plastic hinge portion of a bent component (1) needing reinforcing. Each prefabrication casing wall section is provided with a group of annularly arranged holes (3) with longitudinal bars. Non-bonding longitudinal steel bars (4) are positioned in holes with longitudinal bars and reliably and fixedly connected with the bent component needing reinforcing at two ends of the plastic hinge portion. The subsection prefabrication casing wall for the steel fiber concrete can improve construction speed, is convenient in reinforcing construction, can improve ductility, energy consumption capability, and bending strength of the bent component needing reinforcing and is suitable for enhancing earthquake resistant performance of plastic hinge portions of bent components (piers and the like) of bridges and the like.

Description

The prefabricated shell wall of segmentation steel fibrous concrete

Technical field:

the utility model relates to the prefabricated shell wall of a kind of segmentation steel fibrous concrete.

Background technology:

along with the growing continuously and fast of Chinese national economy, bridge construction has also been obtained remarkable achievement in recent years.The great-leap-forward development of Bridges in Our Country construction provides good opportunity for promoting the subject progress, but also researcher and engineers and technicians has been proposed unprecedented challenge simultaneously.Bridge is an important ring of lifeline engineering, and its construction cost is high, in case suffer seismic damage, will cause enormous economic loss, and the reparation of shake back is extremely difficult, greatly influences the people's the life and the production order.China is located between circum-Pacific seismic belt and the Eurasian earthquake zone, and the most of areas on territory is mostly the west area of earthquake zone, particularly China is the meizoseismal area, and seismic activity is frequent.The bridge construction that China so has a large capacity and a wide range must propose a series of new problems to bridge earthquake resistance.

Extensive studies because the lesson of earthquake disaster makes the various countries scholar attach great importance to bridge earthquake resistance, has been carried out over nearly 40 years in .U.S. San Fernando earthquake (1971), Chinese Tangshan Earthquake (1976), U.S. Loma Prieta earthquake (1989); U.S. Northridge earthquake (1994); The big earthquakes in Osaka and Kobe,Japan (nineteen ninety-five), the collection collection earthquake (1999) of TaiWan, China, Wenchuan devastating earthquake in China (2008) or the like has all caused the serious breaking-up of highway and railroad bridge; Cause huge difficulty to earthquake relief work, make lives and properties suffer very tremendous loss.Therefore, influence and the failure law of earthquake be should be familiar with better, and then anti-seismic performance evaluation, strengthening measure for earthquake resistance that damaged bridge recovers reinforcing and existing bridge furtherd investigate highway, railroad bridge.

are present, and following technical measures are mainly taked in the domestic and abroad bridge seismic hardening: (1) at the shrinkage joint, top seam such as hinge and beam-ends adopt pull bar, block or increase measure such as width of supporting surface, in case the generation of falling stop beam earthquake; (2) horizontal restrain of increase reinforced concrete bridge pier improves its bending resistance ductility and shear strength, prevents that bridge pier is crooked and shears earthquake; (3) employing subtracts seismic isolation technology and special energy-dissipating device, improves the anti-seismic performance of bridge.For example adopt lead-rubber energy dissipating support, intelligent bearing etc.

The highest countries of bridge aseismatic strengthening level such as U.S., Japan; The emphasis of reinforcing from before single anti-fall beam construction measure; Transfer to and pay attention on the bridge abutment integral ductility, the bridge after reinforcing with assurance is suitable with the shock resistance of newly-built bridge.

are over nearly 20 years; Making 100MPa even more high-intensity concrete has no problem. but concrete strength increases; Its fragility also strengthens, and for overcoming this defective, improves the mechanical property of high-strength concrete; Improve breaking resistance, in the high-strength concrete matrix, mix a certain amount of steel fibre of people usually.Content of steel fiber is high more in the steel fibrous concrete, and humidification is obvious more.The mechanical property of high strength steel fibre concrete is excellent; It not only improves intensity significantly; And can guarantee ductility; Can be used in large span, towering, heavy duty and the thin wall construction, if it is more remarkable to be used for bearing the structure effect of dynamic load (for example geological process), visible high strength steel fibre concrete is the good material that is very suitable for seismic hardening.With ordinary reinforced concrete comparatively speaking, utilize steel fibrous concrete to carry out seismic hardening, more the anti-seismic performance of required strenthening member (or structure) is improved on the highland.

Summary of the invention:

The purpose of the utility model provides the prefabricated shell wall anti-seismic performance of a kind of segmentation steel fibrous concrete bracing means; Utilize the high-strength performance and its inner energy dissipation capacity that does not have the bonding reinforcing bar of segmentation high strength steel fiber reinforced concrete, can increase substantially the anti-seismic performance of required reinforcing bending component (bridge pier etc.); Utilize prefabricated segmentation high strength steel fiber reinforced concrete, can improve strengthening construction speed, and strengthening construction is convenient.

Above-mentioned purpose realizes through following technical scheme:

prefabricated shell wall of segmentation steel fibrous concrete; Its composition comprises: the one group of prefabricated shell wall section that is fixedly mounted on the bending component areas of plasticity hinge that needs reinforcing; Have one group of hoop on each described prefabricated shell wall section and arrange the hole that vertical muscle is set; The described the inside, hole that vertical muscle is set arranges not have the bonding longitudinal reinforcement, and has secure fixation to be connected at the areas of plasticity hinge two ends with the bending component that needs to reinforce.

Beneficial effect:

1, the utility model wherein are provided with the longitudinal reinforcement that does not have bonding in the segmentation steel fibrous concrete section shell wall, provide different shell walls intersegmental closing force when purpose is normal operating condition; And can prevent that the concentrated surrender of vertical muscle from producing, can play the power consumption effect, also can in intersegmental slit, high damping material etc. be set at collapse state.

The prefabricated shell wall segmentation of steel fibrous concrete can prevent bending component (bridge pier etc.) the areas of plasticity hinge upper and lower side of need the reinforcing breakage of ftractureing too early in 2, the utility model, thereby embodies the high-strength performance of steel fibrous concrete better.

3, the utility model can improve speed of application, and strengthening construction is convenient, and can increase substantially the anti-seismic performance of strenthening member.

Description of drawings:

accompanying drawing 1 is the main TV structure sketch map of the utility model.

accompanying drawing 2 is A-A sectional drawings of accompanying drawing 1.

accompanying drawing 3 is B-B sectional drawings of accompanying drawing 1.

accompanying drawing 4 is the bridge piers after the segmentation high strength steel fibre concrete shell wall of Pushover analysis is reinforced.

accompanying drawing 5 is E-E sectional drawings of accompanying drawing 4, and UFC refers to the segmentation high strength steel fibre concrete among the figure, and RC refers to ordinary concrete, wherein the arrangement of reinforcement situation: vertical muscle (comprise and do not have the vertical muscle of bonding) diameter is 35mm, and its yield strength is 345Mpa; Stirrup diameter is 22mm, and its yield strength is 345Mpa, and stirrup spacing is 150mm.

accompanying drawing 6 is F-F sectional drawings of accompanying drawing 4.

accompanying drawing 7 be adopt bridge pier and unidimensional, arrangement of reinforcement after the utility model device is reinforced common RC bridge pier shock resistance curve (Pushover analysis result) relatively.

The specific embodiment:

Embodiment 1:

prefabricated shell wall of segmentation steel fibrous concrete; Its composition comprises: the one group of prefabricated shell wall section 2 that is fixedly mounted on bending component (bridge pier) 1 areas of plasticity hinge that needs reinforcing (promptly waiting to reinforce); Have one group of hoop on each described prefabricated shell wall section and arrange the hole 3 that vertical muscle is set; The described the inside, hole that vertical muscle is set arranges not have bonding longitudinal reinforcement 4, and has secure fixation to be connected at the areas of plasticity hinge two ends with the bending component (bridge pier) that needs to reinforce.

Device mounting method: (is example to reinforce bridge pier)

(1) is position, pier bottom in bending component (bridge pier) areas of plasticity hinge; Reinforce the shock resistance that the bridge pier needs reach according to need; Comprise bending resistance, shear resistance etc.; Confirm high, the wall thickness of section and the shell wall height overall of segmentation steel fibrous concrete shell wall section, and the quantity, the diameter that do not have the bonding reinforcing bar in the shell wall; Arrangement of reinforcement wherein for example: vertical muscle (comprise and do not have the vertical muscle of bonding) diameter is 35mm, and its yield strength is 345Mpa; Stirrup diameter is 22mm, and its yield strength is 345Mpa, and stirrup spacing is 150mm.

(2) in the bridge pier areas of plasticity hinge the prefabricated shell wall of segmentation steel fibrous concrete section is installed; Not having the bonding reinforcing bar passes from prefabricated shell wall preformed hole; And guaranteeing it and need reinforcing between bridge pier have reliable the connection, after anchoring piece can be set connect, with high-strength pea gravel concreten filling;

(3) the prefabricated shell wall of segmentation steel fibrous concrete is being installed simultaneously, being provided with does not have the bonding reinforcing bar in the shell wall, and will there be reliable the connection this nothing bonding reinforcing bar bottom with pier footing;

The not bonding reinforcing bar that (4) are stretched from the prefabricated shell wall of segmentation steel fibrous concrete section top; Extend to the bridge pier top always; And there be reliable the connection with Dun Ding; Can be in the nonplastic hinge region height of bridge pier scope cast-in-place ordinary concrete, thereby guarantee that the not bonding reinforcing bar in the prefabricated shell wall of segmentation steel fibrous concrete has the reliable fixation constraint on bridge pier top.

Effect is calculated checking:

Pushover comparative analysis the bridge pier reinforced of the prefabricated shell wall of segmentation steel fibrous concrete (UFC) of same size and arrangement of reinforcement with adopt ordinary concrete to strengthen the bridge pier of RC bridge pier strengthened section; Concrete size and arrangement of reinforcement situation are seen Fig. 4-6; Ordinary concrete RC is C40, and steel fibrous concrete (UFC) strength grade is C120.

During Pushover analyzes horizontal movement from 0 to 0.3m; It is as shown in Figure 7 to obtain two kinds of bridge pier power curves, and the bridge pier that the prefabricated shell wall of visible segmentation steel fibrous concrete (UFC) is reinforced is than the bridge pier shock resistance high by 20% (displacement 0.3m place) that only adopts ordinary concrete to reinforce.Through this example, can adopt the prefabricated shell wall reinforcing of segmentation steel fibrous concrete (UFC) bridge pier can obtain higher anti-seismic performance by illustration.

Claims

1. prefabricated shell wall of segmentation steel fibrous concrete; It is characterized in that: its composition comprises: the one group of prefabricated shell wall section that is fixedly mounted on the bending component areas of plasticity hinge that needs reinforcing; Have one group of hoop on each described prefabricated shell wall section and arrange the hole that vertical muscle is set; The described the inside, hole that vertical muscle is set arranges not have the bonding longitudinal reinforcement, and has secure fixation to be connected at the areas of plasticity hinge two ends with the bending component that needs to reinforce.