CN204882267U - Testing arrangement that twists reverse who creeps is cuted to concrete - Google Patents

Testing arrangement that twists reverse who creeps is cuted to concrete Download PDF

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CN204882267U
CN204882267U CN201520699503.2U CN201520699503U CN204882267U CN 204882267 U CN204882267 U CN 204882267U CN 201520699503 U CN201520699503 U CN 201520699503U CN 204882267 U CN204882267 U CN 204882267U
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concrete
steel
model
bar
creeping
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牛艳伟
曹宏恩
赵育
杜隆基
屈晓晓
张亮
黄平明
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Changan University
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Changan University
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Abstract

The utility model discloses a testing arrangement that twists reverse who creeps is cuted to concrete, including the concrete base, the cylindrical concrete round bar of vertical setting is pour at concrete base center, installs the support steelframe on the concrete base, at present adopt the beam type loading to come to test the shear effect of concrete usually, the utility model provides a be used for testing the method of creeping of shearing through exerting the concrete cylinder to reverse. Testing arrangement exerts two pairs of concentrated forces through the steel tendon and is used in the bottom and solidifies at subaerial cylinder concrete peripherally, forms moment of torsion shear effect. Steel tendon one end is suspended in midair has the steel bracket that loads the concrete piece to form the load to through concreteing the device that turns to that forms braced system and steel tendon at subaerial support steelframe in the bottom, and come the test to be located the displacement of the spacer bar on the concrete cylinder and then the shearing of calculating the concrete is crept through the displacement meter.

Description

一种混凝土剪切徐变的扭转测试装置A Torsion Test Device for Concrete Shear Creep

【技术领域】【Technical field】

本实用新型属于混凝土的徐变试验技术领域,涉及一种混凝土剪切徐变的扭转测试装置。The utility model belongs to the technical field of concrete creep tests and relates to a torsion test device for concrete shear creep.

【背景技术】【Background technique】

目前关于混凝土徐变理论中的徐变系数通常是基于单轴应力条件下的试验研究得到的,之前的一些基于广泛研究和试验的徐变模型如B3模型、CEB-FIP模型、ACI-209R模型较为全面的考虑了混凝土强度、水泥种类、相对湿度等多种因素,但其试验的应力条件均为轴向压应力状态,最新提出的B4模型的徐变部分与B3模型一致仍然采用轴向应力状态,只是完善了收缩考虑的因素。而关于剪切作用下混凝土的徐变试验研究很少。仅假定各种内力下的徐变变形可以近似地取用一个统一的徐变系数得到,即假定剪切作用下的徐变系数与轴向力或弯曲作用下的徐变系数相同。而研究发现剪切作用下产生的徐变位移不可忽略,需要对混凝土剪切徐变进行单独的测试。At present, the creep coefficient in concrete creep theory is usually obtained based on the experimental research under uniaxial stress conditions. Some previous creep models based on extensive research and experiments such as B3 model, CEB-FIP model, ACI-209R model Various factors such as concrete strength, cement type, and relative humidity have been considered comprehensively, but the stress conditions of the test are all axial compressive stress states. The creep part of the newly proposed B4 model is consistent with the B3 model and still uses axial stress. State, just perfecting the shrinkage considerations. However, there are few researches on the creep test of concrete under shear. It is only assumed that the creep deformation under various internal forces can be obtained approximately by using a unified creep coefficient, that is, it is assumed that the creep coefficient under the action of shear is the same as that under the action of axial force or bending. However, the study found that the creep displacement generated under shear cannot be ignored, and a separate test for concrete shear creep is required.

【实用新型内容】【Content of utility model】

本实用新型的目的在于克服上述现有技术的缺点,提供一种混凝土剪切徐变的扭转测试装置,该装置使得混凝土剪切徐变作用可量化考虑,解决目前工程中因为剪切徐变引起的长期变形的机理问题,为混凝土结构变形的预测和计算提供参考。The purpose of this utility model is to overcome the above-mentioned shortcomings of the prior art, and provide a torsion test device for concrete shear creep, which can quantify the effect of concrete shear creep, and solve the problems caused by shear creep in current projects. The mechanism of the long-term deformation provides a reference for the prediction and calculation of the deformation of concrete structures.

为达到上述目的,本实用新型采用以下技术方案予以实现:In order to achieve the above object, the utility model adopts the following technical solutions to achieve:

一种混凝土剪切徐变的扭转测试装置,包括混凝土底座,混凝土底座中心浇筑有竖直设置的圆柱形混凝土圆杆,混凝土底座上安装有支撑钢架;混凝土圆杆上部设置有传力钢筋,荷载托架中部开口,且自上而下套设在混凝土圆杆上,并通过钢绞线吊装在支撑钢架上;钢绞线一端与荷载托架相连,另一端连接在传力钢筋上。A torsion test device for concrete shear and creep, comprising a concrete base, a vertically arranged cylindrical concrete round bar is poured in the center of the concrete base, a supporting steel frame is installed on the concrete base; a force-transmitting steel bar is arranged on the upper part of the concrete round bar, The middle part of the load bracket is open, and it is set on the concrete round rod from top to bottom, and is hoisted on the supporting steel frame by steel strands; one end of the steel strand is connected to the load bracket, and the other end is connected to the force-transmitting steel bar.

本实用新型进一步的改进在于:The further improvement of the utility model is:

所述支撑钢架通过螺栓固定在混凝土底座上。The supporting steel frame is fixed on the concrete base by bolts.

所述支撑钢架的顶部设置有转向钢槽,钢绞线穿过转向钢槽后连接在传力钢筋上。The top of the supporting steel frame is provided with a turning steel channel, and the steel strand is connected to the force-transmitting steel bar after passing through the turning steel channel.

所述传力钢筋为两根十字交叉设置于混凝土圆杆内的钢筋,两根钢筋的两端分别伸出混凝土圆杆的侧面。The force-transmitting reinforcing bars are two crossing reinforcing bars arranged in the concrete round rod, and the two ends of the two reinforcing bars protrude from the side of the concrete round rod respectively.

所述传力钢筋的下方设置有定位钢筋,通过位移计测量定位钢筋的位移变化进而推算剪切徐变。A positioning reinforcement is arranged below the force-transmitting reinforcement, and the displacement change of the positioning reinforcement is measured by a displacement meter to calculate the shear creep.

与现有技术相比,本实用新型具有以下有益效果:Compared with the prior art, the utility model has the following beneficial effects:

本实用新型通过钢丝束和底端通过螺栓固结在混凝土底座上的支撑钢架传递装载在钢托架上的混凝土块产生的荷载,并在底端固结在混凝土底座上的混凝土圆柱上形成扭转剪切作用,通过千分表测试位于混凝土圆柱上的定位钢筋位移的方式采集扭转产生的变形来推算剪切徐变。相较于传统的梁式剪切测试试验,本测试装置仅有扭转剪切作用,无弯矩等其他因素的影响,能对混凝土的剪切徐变进行准确的测试。The utility model transmits the load generated by the concrete block loaded on the steel bracket through the steel wire bundle and the supporting steel frame whose bottom end is consolidated on the concrete base by bolts, and forms a concrete column on the concrete base at the bottom end For the torsional shear action, the shear creep is calculated by collecting the deformation caused by torsion by testing the displacement of the positioning steel bar on the concrete cylinder with a dial gauge. Compared with the traditional beam shear test, this test device only has torsional shear action, without the influence of other factors such as bending moment, and can accurately test the shear creep of concrete.

【附图说明】【Description of drawings】

图1为本实用新型混凝土圆杆与混凝土底座的结构示意图;Fig. 1 is the structural representation of the utility model concrete round rod and concrete base;

图2为本实用新型支撑钢架的结构示意图;Fig. 2 is the structural representation of the utility model supporting steel frame;

图3为本实用新型荷载托架的结构示意图;Fig. 3 is the structural representation of the utility model load bracket;

图4为本实用新型传力钢筋与定位钢筋的位置示意图;Fig. 4 is a schematic diagram of the positions of the force-transmitting reinforcement and the positioning reinforcement of the utility model;

图5为本实用新型的整体结构示意图。Fig. 5 is a schematic diagram of the overall structure of the utility model.

其中:1为混凝土底座;2为混凝土圆杆;3为支撑钢架;4为螺栓;5为荷载托架;6为传力钢筋;7为定位钢筋;8为钢绞线;9为转向钢槽。Among them: 1 is the concrete base; 2 is the concrete round rod; 3 is the supporting steel frame; 4 is the bolt; 5 is the load bracket; 6 is the force transmission steel bar; 7 is the positioning steel bar; 8 is the steel strand; groove.

【具体实施方式】【Detailed ways】

下面结合附图对本实用新型做进一步详细描述:Below in conjunction with accompanying drawing, the utility model is described in further detail:

参见图1至图5,本实用新型混凝土剪切徐变的扭转测试装置,包括混凝土底座1,混凝土底座1中心浇筑有竖直设置的圆柱形混凝土圆杆2,混凝土底座1上安装有支撑钢架3;混凝土圆杆2上部设置有传力钢筋6,荷载托架5中部开口,且自上而下套设在混凝土圆杆2上,并通过钢绞线8吊装在支撑钢架3上;钢绞线一端与荷载托架5相连,另一端连接在传力钢筋6上。支撑钢架3通过螺栓4固定在混凝土底座1上。支撑钢架3的顶部设置有转向钢槽9,钢绞线8穿过转向钢槽9后连接在传力钢筋6上。传力钢筋6为两根十字交叉设置于混凝土圆杆2内的钢筋,两根钢筋的两端分别伸出混凝土圆杆2的侧面。传力钢筋6的下方设置有定位钢筋7,通过位移计测量定位钢筋7的位移变化进而推算剪切徐变。Referring to Fig. 1 to Fig. 5, the torsion test device for concrete shear and creep of the utility model comprises a concrete base 1, and a vertical cylindrical concrete rod 2 is poured in the center of the concrete base 1, and a supporting steel rod 2 is installed on the concrete base 1. frame 3; the upper part of the concrete round rod 2 is provided with a force-transmitting steel bar 6, and the middle part of the load bracket 5 is open, and is sleeved on the concrete round rod 2 from top to bottom, and is hoisted on the supporting steel frame 3 through a steel strand 8; One end of the steel strand is connected to the load bracket 5, and the other end is connected to the force-transmitting steel bar 6. The supporting steel frame 3 is fixed on the concrete base 1 by bolts 4 . The top of the supporting steel frame 3 is provided with a turning steel channel 9, and the steel strand 8 is connected to the force transmission steel bar 6 after passing through the turning steel channel 9. The force-transmitting steel bars 6 are two steel bars crossed and arranged in the concrete round rod 2 , and the two ends of the two steel bars protrude from the sides of the concrete round rod 2 respectively. A positioning steel bar 7 is arranged below the force transmission steel bar 6, and the displacement change of the positioning steel bar 7 is measured by a displacement meter to calculate the shear creep.

本实用新型所涉及的剪切徐变测试装置由下端固结在混凝土底座上的混凝土圆柱体,下端通过螺栓固结在混凝土底座上的支撑钢架,钢托架,钢丝束,千分表,混凝土加载块组成。剪切徐变构件如图1中圆柱体混凝土圆杆2,其浇筑制作时固结于混凝土底座1上,图2中的支撑钢架3通过高强螺栓4与混凝土底座1固结,图3中用于加载荷载块的荷载托架5通过一端连接在图4中的传力钢筋6的钢绞线8吊在支撑钢架3上,荷载块的重力作用通过支撑钢架的转向作用转换为作用在试验构件上的扭矩,从而对圆柱体混凝土圆杆形成纯剪切作用,通过位移计测量图4中定位钢筋7的位移变化进而推算剪切徐变。The shear creep test device involved in the utility model consists of a concrete cylinder whose lower end is consolidated on the concrete base, a supporting steel frame whose lower end is consolidated on the concrete base by bolts, a steel bracket, a steel wire bundle, a dial gauge, Concrete loaded block composition. The shear creep member is a cylindrical concrete rod 2 as shown in Fig. 1, which is consolidated on the concrete base 1 during pouring and fabrication. The supporting steel frame 3 in Fig. 2 is consolidated with the concrete base 1 through high-strength bolts 4. The load bracket 5 used to load the load block is suspended on the supporting steel frame 3 through the steel strand 8 connected to the force-transmitting steel bar 6 in Fig. The torque on the test member forms a pure shear action on the cylindrical concrete rod, and the displacement change of the positioning steel bar 7 in Figure 4 is measured by the displacement meter to calculate the shear creep.

本实用新型目的在于通过长期观察剪切试验中等直混凝土圆柱体在纯剪作用下的切应变,从而推算剪切徐变计算模式,为桥梁设计提供考虑剪切作用的理论参考。具体测试方法如下:The purpose of the utility model is to calculate the shear creep calculation mode through long-term observation of the shear strain of the straight concrete cylinder in the shear test under the pure shear action, and provide a theoretical reference for bridge design considering the shear action. The specific test method is as follows:

1、浇筑图1所示混凝土构件,等值圆杆高为L,截面半径为r。1. Pour the concrete member shown in Figure 1, the height of the equivalent round rod is L, and the section radius is r.

2、将图2支撑钢架和图3荷载托架按顺序装配到位。2. Assemble the supporting steel frame in Figure 2 and the load bracket in Figure 3 in sequence.

3、安装位移计,测量定位钢筋的位移。3. Install a displacement meter to measure the displacement of the positioning steel bar.

4、施加荷载,将混凝土荷载块置于荷载托架上。4. To apply the load, place the concrete load block on the load bracket.

5、读取初位移l(t0),则初始切应变为 5. Read the initial displacement l(t 0 ), then the initial shear strain is

6、通过集箱长期采集数据得到t时刻的定位钢筋的位移l(t,t0),则t时刻构件的切应变为 γ ( t , t 0 ) = r × a r c t a n l ( t , t 0 ) r L . 6. The displacement l(t,t 0 ) of the positioning reinforcement at time t is obtained through the long-term data collection of the header, and the shear strain of the member at time t is γ ( t , t 0 ) = r × a r c t a no l ( t , t 0 ) r L .

7、剪切徐变系数用φsc(t,t0)来描述,则有 7. The shear creep coefficient is described by φ sc (t,t 0 ), then

以上内容仅为说明本实用新型的技术思想,不能以此限定本实用新型的保护范围,凡是按照本实用新型提出的技术思想,在技术方案基础上所做的任何改动,均落入本实用新型权利要求书的保护范围之内。The above content is only to illustrate the technical idea of the utility model, and cannot limit the protection scope of the utility model. Any changes made on the basis of the technical solution according to the technical idea proposed by the utility model all fall into the scope of the utility model. within the scope of protection of the claims.

Claims (5)

1. the concrete shearing torsion proving installation of creeping, it is characterized in that, comprise concrete bed (1), the cylindrical concrete round bar (2) vertically arranged is built at concrete bed (1) center, concrete bed (1) is provided with supporting steel frame (3); Concrete round bar (2) top is provided with power transmission reinforcing bar (6), load bracket (5) intermediate openings, and be set on concrete round bar (2), and be lifted on supporting steel frame (3) by steel strand wires (8) from top to bottom; Steel strand wires one end is connected with load bracket (5), and the other end is connected on power transmission reinforcing bar (6).
2. the concrete shearing according to claim 1 torsion proving installation of creeping, it is characterized in that, described supporting steel frame (3) is fixed on concrete bed (1) by bolt (4).
3. the concrete shearing according to claim 1 torsion proving installation of creeping, it is characterized in that, the top of described supporting steel frame (3) is provided with and turns to steel tank (9), and steel strand wires (8) are connected on power transmission reinforcing bar (6) after turning to steel tank (9).
4. the concrete shearing according to claim 1 torsion proving installation of creeping, it is characterized in that, described power transmission reinforcing bar (6) is the reinforcing bar that two right-angled intersections are arranged in concrete round bar (2), and the side of concrete round bar (2) is stretched out at the two ends of two reinforcing bars respectively.
5. the concrete shearing according to claim 4 torsion proving installation of creeping, it is characterized in that, the below of described power transmission reinforcing bar (6) is provided with spacer bar (7), by change in displacement and then the reckoning shear creep of displacement meter measurement and positioning reinforcing bar (7).
CN201520699503.2U 2015-09-10 2015-09-10 Testing arrangement that twists reverse who creeps is cuted to concrete Active CN204882267U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105092393A (en) * 2015-09-10 2015-11-25 长安大学 Torsion test device and method for concrete shear creep

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105092393A (en) * 2015-09-10 2015-11-25 长安大学 Torsion test device and method for concrete shear creep

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