CN204252400U - A kind of reinforcing bar connector for earthquake-proof frame top story knee joint - Google Patents

Abstract

The utility model provides a kind of reinforcing bar connector for earthquake-proof frame top story knee joint, for earthquake zone Top Floor on Frame Structure end node, the connection of reinforcing bar in node outside the top story knee joint central sill upper reinforcement of Frame _ Shear Wall Structure frame part and post, solve be positioned at earthquake zone framework top story knee joint beam upper reinforcement, reinforcing bar causes affect reinforcing bar and concrete adhesive property because of overlap joint outside post, and the crowded construction quality problem being not easy to construction and bringing of node area reinforcing bar.

Description

A kind of reinforcing bar connector for earthquake-proof frame top story knee joint

Technical field

The utility model relates to a kind of reinforcing bar connector of earthquake-proof frame top story knee joint.

Background technology

Be subject to the frame construction of geological process, in the top story knee joint of the frame part of frame shear wall structure, transmitting the requirement of hogging moment in order to meet beam-ends and styletable, stretching into reinforcing bar outside the beam upper reinforcement of node and post and must take the method carrying out overlapping in node.The bridging method that the engineering construction standard of current China and atlas provide mainly contains:

1, beam inside lap method (" Code for design of concrete structures " GB50010-2010).As shown in Figure of description Fig. 1, outside post, reinforcing bar extends to beam-ends bending behind node top, and beam upper reinforcement extends the backward lower bending of node opposite side, beam, post reinforcing bar outside node and end face carry out bending and overlap, total lap length is not less than 1.5l _abE, l herein _abEfor the antidetonation anchorage length of reinforcing bar.For clarity, do not draw the inner side reinforcing bar of post in Fig. 1, stirrup that muscle and node area are indulged in the lower rebar of beam, the upper and lower part of orthogonal beam.The shortcoming of this bridging method is: (1) due to the breadth of section of usual post wider than the breadth of section of beam, therefore outside post, the arrangement of reinforcing bar usually can not be alignd with the arrangement of beam upper reinforcement and overlapped, cause beam, post reinforcing bar can not consistency from top to bottom at the top of node, add that the upper reinforcement of orthogonal beam also will run through node from node top along another orthogonal direction, make by node top in node during concreting, usually build not smooth, not only reduce labor productivity, also very easily occur concrete pouring quality problem; (2) when placing node area stirrup, particularly node size is comparatively large, needs when node area arranges compound stirrup, and bending post muscle hinders the in place and colligation of node stirrup.

2, post inside lap method (" Code for design of concrete structures " GB50010-2010).As shown in Figure of description Fig. 2, beam upper reinforcement extends the backward lower bending of node opposite side, overlaps with the straight line outside node of reinforcing bar outside post.Total lap length is not less than 1.7l _abE, l herein _abEfor the antidetonation anchorage length of reinforcing bar.In like manner, for clarity, do not draw the inner side reinforcing bar of post in Fig. 1, stirrup that muscle and node area are indulged in the lower rebar of beam, the upper and lower part of orthogonal beam.The method disadvantage is because the length of reinforcing bar straight line overlap joint is longer (such as secondary seismic behavior framework, get the HRB400MPa level reinforcing bar of C30 concrete, diameter 20mm, its lap length is 1.972m), because constuction joint is arranged on beam bottom position, must in advance the length thereof that bending beam muscle exceeds at the bottom of beam be cast in post when building the concrete of post.During the concrete coagulation of post, stretch out by capital the disturbance that longer bending beam muscle is subject to when constructing, obviously will affect overlap reinforcing bar and concrete bonding, thus impact overlap joint quality.Therefore, in current engineering construction, seldom this kind of bridging method is adopted.

3, the beam as shown in " Bar Anchorage plate application technology code " JGJ 256-2011 (the tenth page of Fig. 4 .1.3-3), post muscle end add the bridging method of anchor plate: the outside reinforcing bar of post extends node top after end adds anchor plate, except bight reinforcing bar directly extends node top, all the other post muscle all bend to beam-ends after extending node top, require that the anchor head of post muscle extends inside node.Beam upper reinforcement extends node opposite side after end adds anchor plate, and beam, the post reinforcing bar of band anchor plate take straight line to overlap at node end face.In this bridging method, owing to shortening the lap length of reinforcing bar, for ensureing that overlap has good power transmission effect, need on the beam muscle in bar splicing district, to arrange the U-shaped reinforcing bar inserted from top to bottom specially.The shortcoming of this bridging method is: (1) is not owing to being that whole mixed lateral column muscle can both carry out with beam muscle overlapping (two, bight mixed lateral column muscle does not participate in overlapping), if the post muscle diameter selected is large, radical is few, the post muscle percentage then effectively overlapped with beam muscle is just few, the hogging moment that can effectively transmit will be affected, and therefore the validity of this bridging method also needs further inspection and investigates; (2) this bridging method still effectively could not solve the problem along node top concreting difficulty.The horizontal hoop of node area and compound stirrup have natively made the reinforcing bar of node area very crowded, when adopting in this way, need insert the U-shaped muscle of some on node top, this, by making the reinforcing bar of node area more crowded, is more unfavorable for concrete building.

At present in the work progress of framework top story knee joint, node area stirrup in place, when being particularly designed with compound stirrup, stirrup accurately in place is a great problem of construction.The reinforcing bar of the both direction orthogonal beam not only having other position node to have due to top story knee joint and styletable reinforcing bar run through that the reinforcing bar of the node area that node (or carrying out anchoring at intra-node) causes is intensive, congested problem, the special stirrup difficult problem in place also having bending overlap joint (three kinds of bridging methods as above) carried out at node area and beam or styletable after reinforcing bar stretches into node outside top story knee joint beam-ends upper reinforcement and styletable to cause, has namely bent reinforcing bar or beam upper steel influential point of tendons outside post in 90 ° and has hindered being inserted in of stirrup in place.Constructor often have at the construction field (site) the stirrup closed be pulled open again carry out in place.Which not only adds engineering time and the difficulty of top story knee joint, also bring certain impact to the accuracy of stirrup position, spacing and stirrup end 135 ° of crotch angles, thus have influence on the anti-seismic performance of node area.

Visible, in current China frame construction and frame shear wall structure, outside the beam upper reinforcement adopt design and the construction of top story knee joint and post, reinforcing bar does not all fundamentally solve node not only constructability but also have good stressed and anti-seismic performance problem at the bridging method of node area.

Utility model content

The purpose of this utility model is to provide a kind of reinforcing bar connector for earthquake-proof frame top story knee joint overlap joint, it is for the connection of reinforcing bar outside framework top story knee joint beam upper reinforcement and post, effectively can solve the problem of the crowded and stirrup difficulty in place of top story knee joint reinforcing bar.

The purpose of this utility model is achieved in that

For a reinforcing bar connector for earthquake-proof frame top story knee joint, it is characterized in that: reinforcing bar connector is formed by connecting by post muscle junction plate, beam muscle junction plate and middle connecting plate; Its center pillar muscle junction plate, beam muscle junction plate are separately positioned on the two ends of middle connecting plate, and are positioned at the homonymy of middle connecting plate, and outer angle is 45 °; Post muscle junction plate and beam muscle junction plate all there is bar connecting hole.

Form the post muscle junction plate of above-mentioned reinforcing bar connector, the thickness h of beam muscle junction plate and middle connecting plate is identical, calculates by formula (1).

$h=\frac{n_c\·\mathrm{\π}\·d_{\mathrm{eq}}^2}{4(b-2d_{\mathrm{eq}})}---\left(1\right)$

In formula: h-reinforcing bar connector thickness;

N _cthe total radical of reinforcing bar outside-post;

B-node width;

D _eqthe equivalent diameter of reinforcing bar outside-post, n _k, d _ckrespectively

For the radical of reinforcing bar kth kind diameter outside post and the nominal diameter of kth kind diameter, i is post

The quantity of outside reinforcing bar different-diameter.

Find in research, if the too small meeting of maximum bar diameter of post or beam causes the thinner thickness of connector thus makes the rigidity of reinforcing bar connector inadequate, the thickness h of above-mentioned reinforcing bar connector is not less than and is connected 0.8 times of maximum gauge in post reinforcing bar and beam steel and the thickness h of above-mentioned reinforcing bar connector is not less than 14mm is good.

The width of above-mentioned post muscle junction plate, beam muscle junction plate gets 3 times that to be connected in post muscle maximum gauge in maximum gauge and beam muscle respectively, and the width of middle connecting plate gets 2 times of post muscle maximum gauge for good.

The length of above-mentioned junction plate is got node width b and is deducted 2d _eqfor good.

Above-mentioned reinforcing bar connector can adopt the mode of welding to connect, and during welding, when the thickness of reinforcing bar connector is less than 20mm, weld seam adopts bevel welding, and bevel angle is 45 °; When the thickness of plate is greater than 20mm, weld seam should adopt bilateral groove welding, bevel angle 45 °.

The utility model has following beneficial effect:

The utility model is applicable to earthquake zone Top Floor on Frame Structure end node, the connection of reinforcing bar in node outside the top story knee joint central sill upper reinforcement of frame shear wall structure frame part and post, solve be positioned at earthquake zone framework top story knee joint beam upper reinforcement, reinforcing bar causes affecting reinforcing bar and concrete adhesive property because of overlap joint outside post, and the crowded construction quality problem being not easy to construction etc. and bringing of node area reinforcing bar, be embodied in

(1) can avoid node under earthquake repeated action, outside beam upper reinforcement, post, reinforcing bar is because overlapping the Relative sliding caused, and causes the anti-seismic performance deterioration of top story knee joint;

(2) because post muscle, beam muscle do not need bending overlap joint, the accurately in place and colligation of node area of being more convenient for stirrup;

(3) can improving reinforcing bar outside beam upper reinforcement, post, to overlap in node area the reinforcing bar caused crowded, is convenient to by node top concreting, keeps concreting unobstructed, not only increase operating efficiency, also ensure that concrete pouring quality;

(4) pattern that reinforcing bar connector is provided and delivered according to reinforcing bar is produced in factory, and integral installation is made into the linkage of reinforcing bar outside beam upper reinforcement and post at the construction field (site), can improve construction precision and speed;

(5) outside beam upper reinforcement, post, reinforcing bar is changed into by overlap joint and connecting with reinforcing bar connector, can save rolled steel dosage.

Accompanying drawing explanation

Fig. 1 is the beam inside lap schematic diagram of the top story knee joint negative bending moment rib of " Code for design of concrete structures " GB50010-2010;

1-beam in figure; 2-post; Reinforcing bar outside the post stretching into beam-ends after 3-bending; 4-can not stretch into the post outer corners reinforcing bar of beam-ends; 5-beam upper reinforcement.

Fig. 2 is the post inside lap schematic diagram of the top story knee joint negative bending moment rib of " Code for design of concrete structures " GB50010-2010;

1-beam in figure; 2-post; The beam upper reinforcement in post is stretched into after 3 '-bending; Reinforcing bar outside 4 '-post.

Fig. 3 is the three dimensions schematic diagram of reinforcing steel bar connecting device outside the beam upper reinforcement of the utility model embodiment and post;

Fig. 4 is the reinforcing bar connector three dimensions schematic diagram of the utility model embodiment;

Fig. 5 is the mixed lateral column reinforcing bar of the utility model embodiment and the three-dimensional graph of top beam steel;

Fig. 6 is the reinforcing bar connector bevel for welding angle schematic diagram of the utility model embodiment.

Detailed description of the invention

Below by embodiment, the utility model is specifically described; what be necessary to herein means out is; following examples are only for being further detailed the utility model; can not be interpreted as the restriction to the utility model protection domain, the person skilled in the art in this field can make some nonessential improvement and adjustment according to above-mentioned utility model content to the utility model.

Embodiment 1

The strength classes of structural steel of reinforcing bar connector is conventionally determined according to the strength grade of reinforcing bar outside beam upper reinforcement, post.The strength classes of structural steel of reinforcing bar connector should be not less than the maximum intensity reinforcing bar grade be connected in reinforcing bar.According to the physical dimension of top story knee joint, outside beam upper reinforcement, post, the quantity of reinforcing bar and diameter conventionally determine the physical dimension of reinforcing bar connector.The post muscle junction plate of composition reinforcing bar connector, the thickness h of beam muscle junction plate and middle connecting plate is identical, and carries out calculating by formula (1) and determine.

$h=\frac{n_c\·\mathrm{\π}\·d_{\mathrm{eq}}^2}{4(b-2d_{\mathrm{eq}})}---\left(1\right)$

In formula: h-reinforcing bar connector thickness;

N _cthe total radical of reinforcing bar outside-post;

B-node width;

D _eqthe equivalent diameter of reinforcing bar outside-post, n _k, d _ckrespectively

For outside the radical of reinforcing bar outside kth kind diameter post and kth kind diameter post, the nominal of reinforcing bar is straight

Footpath, i is the quantity of the different-diameter that outside post, reinforcing bar adopts.

Such as: when the outside reinforcing bar stretching into top story knee joint post is the reinforcing bar that 3 diameter 20mm add 4 diameter 25mm, have the reinforcing bar of two kinds of diameters here, i=2, the reinforcing bar of the first diameter is 3 diameter 20mm, i.e. n ₁=3, d _c1=20mm; The reinforcing bar of the second diameter is 4 diameter 25mm, i.e. n ₂=4, d _c2=25mm, then outside post, the equivalent diameter of reinforcing bar is:

$d_{\mathrm{eq}}=\underset{k=1}{\overset{2}{\mathrm{\Σ}}}\left(n_k{d}_{\mathrm{ck}}^2\right)/\underset{k=1}{\overset{2}{\mathrm{\Σ}}}\left(n_k{d}_{\mathrm{ck}}\right)$

$\begin{array}{c}=(n_1\×d_{c1}^2+n_2\×d_{c2}^2)/(n_1\×d_{c1}+n_2\×d_{c2})\\ =(3\×{20}^2+4\×{25}^2)/(3\×20+4\×25)\≈23\mathrm{mm}\end{array}.$

According to the physical dimension of top story knee joint, outside beam upper reinforcement, post, the quantity of reinforcing bar and diameter conventionally determine other physical dimensions of reinforcing bar connector.

Boring: according to the position of the quantity of reinforcing bar, beam upper reinforcement outside post, diameter and reinforcing bar, hole on the post muscle junction plate and beam muscle junction plate of reinforcing bar connector respectively.Be specially and beam muscle junction plate 13 is bored beam steel hole 17; By post muscle junction plate 14 drill string reinforced hole 18; The diameter in each hole is preferably got reinforcing bar nominal diameter and is added 3mm.

Welding: by post muscle junction plate 14, the two ends (see Fig. 4) beam muscle junction plate 13 being welded in middle connecting plate 15 homonymy, and the outer angle (i.e. bevel angle) 16 of welding is 45 ° (see Fig. 6).The relevant regulations of welding should meet " construction steel structure solder technology code " JGJ 81.

Processing screw terminal: by the end of beam upper reinforcement 10 processing screw terminal 20; By the end of reinforcing bar outside post 9 processing screw terminal 19 (see Fig. 5).Steel bar head processing is processed according to the silk head of ordinary straight threaded reinforcing bar joint, the relevant regulations of " mechanical connection technique of reinforcement code " JGJ 107 that should conform to current standards.

Fixing of beam upper reinforcement: beam upper reinforcement 10 double nut 11 processing screw terminal is fastenedly connected (see Fig. 3) on reinforcing bar reinforcing bar connector 8.Steel bar head should stretch out nut, and protruded length should not be less than 1.0 p (p is pitch).

Post 7 is concrete builds: before building top layer post, and outside post upper end having been processed screw terminal, the lower end of reinforcing bar is connected in place with the lower end of reinforcing bar inside post with bottom joint bar, and the stirrup of the good post of colligation, shuts template, build.

After the concrete initial set of post, the knee level stirrup processed is inserted in by post muscle top, carries out in place, colligation.

By the beam upper reinforcement with reinforcing bar connector 8, it is in place that lower rebar puts into node area, is fastenedly connected on reinforcing bar connector by termination with reinforcing bar 9 double nut 12 outside the post of screw terminal; So far the upper reinforcement of beam and the outside reinforcing bar of post are connected as one by reinforcing bar connector, this reinforcing bar connector can either the pulling force that transmits of bolster top beam muscle and mixed lateral column muscle, also can bear the pressure of beam upper reinforcement and the transmission of mixed lateral column muscle, ensure that node can bear the repeated action of earthquake.

The reinforcing bar of orthogonal beam is run through node, and colligation is in place, node area concreting, end-of-job.

Under geological process, top story knee joint district is subject to moment of flexure repeatedly and the shearing action of beam-ends, styletable, top story knee joint adopts reinforcing bar connector of the present utility model, can obviously improve node top due to intensive the brought concreting of reinforcing bar not smooth, not only improve concrete pouring quality, and improve operating efficiency.Use the utility model in construction, do not need reinforcing bar and beam upper reinforcement outside coupled columns to carry out bending overlap joint, facilitate the in place of node area stirrup and colligation construction, when particularly node area is provided with compound stirrup, the accuracy of the reinforcement location of node area, stirrup spacing and 135 °, stirrup termination can be ensured, improve construction quality; Beam upper reinforcement is connected by connector with reinforcing bar outside post, can bear more reliably seismicly to draw, pressure, ensure the anti-seismic performance of node; The pattern that reinforcing bar connector is provided and delivered according to reinforcing bar is produced in factory, is assembled into the linkage of reinforcing bar outside beam upper reinforcement and post at the construction field (site), can improve on-the-spot construction precision and speed; Outside beam upper reinforcement, post, reinforcing bar is changed into by overlap joint and connecting with reinforcing bar connector, can save rolled steel dosage.

Claims (7)

1. for a reinforcing bar connector for earthquake-proof frame top story knee joint, it is characterized in that: reinforcing bar connector is formed by connecting by post muscle junction plate, beam muscle junction plate and middle connecting plate; Its center pillar muscle junction plate, beam muscle junction plate are separately positioned on the two ends of middle connecting plate, and are positioned at the homonymy of middle connecting plate, and outer angle is 45 °; Post muscle junction plate and beam muscle junction plate all there is bar connecting hole.

2. reinforcing bar connector as claimed in claim 1, is characterized in that: the post muscle junction plate of reinforcing bar connector, the thickness h of beam muscle junction plate and middle connecting plate is identical.

3. reinforcing bar connector as claimed in claim 2, is characterized in that: 0.8 times of the thickness h of reinforcing bar connector >=be connected maximum gauge in post reinforcing bar.

4. reinforcing bar connector as claimed in claim 2, is characterized in that: 0.8 times of the thickness h of reinforcing bar connector >=be connected maximum gauge in beam steel.

5. reinforcing bar connector as claimed in claim 2, is characterized in that: the thickness h >=14mm of reinforcing bar connector.

6. the reinforcing bar connector as described in any one of claim 1-5, is characterized in that: the width of post muscle junction plate, beam muscle junction plate gets 3 times that to be connected in post muscle maximum gauge in maximum gauge and beam muscle respectively.

7. the reinforcing bar connector as described in any one of claim 1-5, is characterized in that: the width of middle connecting plate gets 2 times of post muscle maximum gauge.