CN1116264A

CN1116264A - Large column net prestressed plate frame structure system

Info

Publication number: CN1116264A
Application number: CN 95101367
Authority: CN
Inventors: 刘永颐
Original assignee: ARCHITECTURAL STRUCTURE INST CHINESE ARCHITECTURE SCIENCE ACADEMY
Current assignee: ARCHITECTURAL STRUCTURE INST CHINESE ARCHITECTURE SCIENCE ACADEMY
Priority date: 1995-02-10
Filing date: 1995-02-10
Publication date: 1996-02-07

Abstract

Said system consists of rectangle post net, beam and plate. The beam is installed only at the axis of post, building floor is prestressed concrete plate. The ratio of neight and length is H/L=1/12-1/20; the orthogonally arranged stripe shape prestressed no adhesive rib group is adopted in plate which is distributed in paralola; the counter bending point is at the position of (0.1-0.15)L. Compared with current frame structure, said system can save concrete by 10% and reinforcing bar by 30%, shorten construction period by 30-50%.

Description

Large column net prestressed plate frame structure system

The present invention is a kind of novel building form of structure, is particularly suitable for the industry of 7～15 meters post nets, civilian and public building structure employing.

Existing large column net building structure mostly adopts ordinary reinforced concrete or prestressed concrete primary and secondary beam frame construction, sheet-pile frame construction, multi-ribbed plate frame construction, nine-squares beam superstructure frame construction.Wherein plate, column framework moulding are simple, are convenient to rapid construction, but increase when span, and economic benefit descends during for example greater than 9 meters, and brings the shortcoming of danger of floor punching failure and shock resistance difference; The frame construction that multi-ribbed plate, primary and secondary beam and nine-squares beam superstructure are formed, its template and reinforced bar engineering complexity, speed of application is slow.

The objective of the invention is, a kind of novel large column net prestressed plate frame structure system is provided, this structure had both satisfied building function and structural performance requirement, can significantly save material and the labour again, speeded up the work greatly.

Large column net prestressed plate frame structure system of the present invention, form by rectangular column net, beam and plate, it is characterized in that: only on mast axis, establish beam, flooring is prestressed concrete slab, and beam is the partial prestressing beam, and the rise-span ratio scope of beam is in H/L=1/12～1/20, presstressed reinforcing steel in the beam is similar to traditional prestressed continuous beam arrangement of reinforcement, by the moment of flexure distribution pattern, be forward and reverse parabolic distribution, the inflection point position also is (0.1～0.15) L; Plate is a prestressed concrete slab, and the rise-span ratio scope of plate is in HL/L=1/45～1/60; Adopt the banded prestressing force unbonded tendon bundle of orthogonal configuration in the prestressed concrete slab, distribute by moment of flexure, banded prestressing tendon is forward and reverse parabola and arranges that the position of inflection point is generally (0.1～0.15) L in the plate thickness scope.

Described banded prestressing tendon suffers one by the high tensile steel wire of 12～15 millimeters of 2～6 diameters or one of steel strand and is arranged in juxtaposition and forms, every muscle is coated with anti-corrosive grease and wraps up plastics, the two ends (stretch-draw end or anchored end) of banded prestressing tendon begin every muscle is progressively separated at about 1.5 meters of distance ground tackle, in order to arranging ground tackle and stretch-draw, the every muscle spacing in end is about 10～15 centimetres.

Large column net prestressed plate frame structure system of the present invention, in prestressed concrete slab, adopt the banded prestressing tendon of concentrating preparation, behind stretch-draw prestressing force, can form the upwards even distributed force of effect along bunch, thereby but the deadweight of the whole plates of balance and part live load under the deadweight effect and under the prestressing force acting in conjunction, can form antiarch upwards, thereby can significantly reduce the amount of deflection under the external load effect, satisfy rigidity and requirement of strength building cover structure; Prestressing force is all arranged in beam, the plate, the crack resistance of structure is improved greatly, thereby enlarged the limit value between Temperature Joint, 15 ℃ of the temperature difference, under the situation of concrete shrinkage value 3/10000ths, the Temperature Joint spacing is about 80 meters, should relax more less than 55 meters limit value than the cast-in-situ concrete frame construction Temperature Joint spacing of regulation and stipulation, the bigger flexible leeway of architect can be given like this, thereby huge economic benefit and accelerating construction progress greatly can be brought; Owing to adopt the grillage in banded prestressing tendon replacement nine-squares beam superstructure and the ribbed slab floor, formed large-area dull and stereotyped flooring, removed the formwork engineering quantity of trifling complexity from, for adopt large form, fly mould, advanced template system such as table mould creates conditions, also can save processing, colligation, the location work of the main muscle of intersection in the grillage, save whole stirrups and replace very simple continuous unbonded prestressing tendon; Reinforcing bar in the structure of the present invention is high tensile steel wire or high strength steel strand, one ton of high strength steel strand can replace 4～5 tons of common secondary indented barss, reduction effect is fairly obvious, compare with traditional nine-squares beam frame construction, can save concrete about 10%, reinforcing bar 30%, construction period 30～50% in advance.

Large column net prestressed plate frame structure system of the present invention is applicable to the industry of 7～15 meters post nets, civilian and public building structure employing.

Below in conjunction with drawings and Examples large column net prestressed plate frame structure system is further described.

Fig. 1 is the plan view of large column net prestressed plate frame structure system

Fig. 2 is banded prestressing tendon bundle type arrangement diagram parabolically in plate thickness in the large column net prestressed plate frame structure system

Fig. 3 is banded prestressing tendon sectional drawing

Fig. 4 is that figure is handled in banded prestressing tendon end anchorage

As shown in the figure, a kind of large column net prestressed plate frame structure system, colum network size is 12 meters * 12 meters, arrange concrete flat slab 3 along the axis arranged partially prestressed beam 2 of post 1 with between axis, the rise-span ratio scope of beam is H/L=1/12～1/30, and the rise-span ratio scope of prestressed concrete slab is H/L=1/45～1/60; Adopt the banded prestressing force unbonded tendon bundle 4 of orthogonal configuration in the prestressed concrete slab, ribbon beam is every direction 3-6 bundle, every bundle muscle is 2～6, diameter is 12～15 millimeters steel strand 5, distribute by moment of flexure, banded prestressing tendon is parabola and arranges that the position of inflection point is generally (0.1～0.15) L in the plate thickness scope.

One of high strength steel strand suffers one and is arranged in juxtaposition composition, every muscle or line are coated with anti-corrosive grease and wrap up plastics, the two ends (stretch-draw end or anchored end) of banded prestressing tendon begin every muscle is progressively separated at distance ground tackle 6 about 1.5 meters, in order to arranging ground tackle and stretch-draw, the every muscle spacing in end is about 10～15 centimetres.

Claims

1, a kind of large column net prestressed plate frame structure system, form by rectangular column net, beam and plate, it is characterized in that: only on mast axis, establish beam, flooring is prestressed concrete slab, and beam is the partial prestressing beam, and the rise-span ratio scope of beam is in H/L=1/12～1/20, presstressed reinforcing steel in the beam is similar to traditional prestressed continuous beam arrangement of reinforcement, by the moment of flexure distribution pattern, be forward and reverse parabolic distribution, the inflection point position also is (0.1～0.15) L; Plate is a prestressed concrete slab, and the rise-span ratio scope of plate is in H/L=1/45～1/60; Adopt the banded prestressing force unbonded tendon bundle of orthogonal configuration in the prestressed concrete slab, distribute by moment of flexure, banded prestressing tendon is forward and reverse parabola and arranges that the position of inflection point is generally (0.1～0.15) L in the plate thickness scope.

2, large column net prestressed plate frame structure system as claimed in claim 1, it is characterized in that: the banded prestressing force unbonded tendon bundle that adopts orthogonal configuration in the described prestressed concrete slab suffers one by the high tensile steel wire of 12～15 millimeters of 2～6 diameters or one of steel strand and is arranged in juxtaposition and forms, every muscle is coated with anti-corrosive grease and wraps up plastics, the two ends (stretch-draw end or anchored end) of banded prestressing tendon begin every muscle is progressively separated at about 1.5 meters of distance ground tackle, in order to arranging ground tackle and stretch-draw, the every muscle spacing in end is about 10～15 centimetres.