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Test device of concrete shear creep coefficient and test method thereof

A technology of testing device and testing method, which is applied in the direction of testing the ductility of materials, etc., can solve the problems such as the shear creep coefficient of concrete that have not yet appeared, and achieve the effects of reducing the difficulty of loading, clear testing methods, and convenient operation

Active Publication Date: 2014-07-23
CHANGAN UNIV
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  • Abstract
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Problems solved by technology

There is no test method for the shear creep coefficient of concrete

Method used

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  • Test device of concrete shear creep coefficient and test method thereof
  • Test device of concrete shear creep coefficient and test method thereof

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] see figure 1 , the device of the present invention comprises welded steel or a pedestal structure for supporting a long side of the cross-beam test piece 1, a support 2 that can make the support end of the cross-beam test piece 1 rotate along the support line, and the other side of the cross-beam test piece 1 A loading bracket 3 with a loading weight 4 is installed and placed on one long side; strain sensors 5 are respectively arranged along the long sides at the central intersection positions of the cross beam specimen 1, and the strain sensors 5 transmit the collected signals to the collection box through wires 6.

[0021] see figure 2 , one long side of the cross-beam specimen is supported by a bracket, and then a loading bracket is installed on the other long side, and a load is placed on the loading bracket below the specimen, then under the ac...

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Abstract

The invention discloses a test device of a concrete shear creep coefficient and a test method thereof. The test device comprises a bracket which is used for supporting a long edge of a cross beam specimen, so that the support end of the cross beam specimen rotates along a support line, wherein a loading bracket is arranged on the other long edge of the specimen; a loading weight is placed on the loading bracket; and a strain transducer is respectively arranged at the intersected position at the center of the cross beam specimen along the long edge, and conveys the collected signal to a collection case through a lead. The test method comprises the following steps: casting the specimen into the cross beam specimen, and measuring compressive strain and tensile strain in idle load; mounting the loading bracket on which the loading weight is placed, and measuring the compressive strain and the tensile strain after loading; computing the elastic strain of the load age by comparing with the numerical value in idle load; obtaining the elastic strain at any moment by long-term continuous collection; finally computing the shear creep coefficient according to the formula. Thus, reverse loading is carried out through the bending of the cross beam; the test device and the test method are simpler, more convenient and safer to operate.

Description

technical field [0001] The invention relates to a concrete coefficient test device and a test method thereof, in particular to a concrete shear creep coefficient test device and a test method thereof. Background technique [0002] When a concrete structure is stressed in space, the stress at any point in the structure can be expressed by three normal stresses and three shear stresses (Ferdinand P.Beer, E.Russell Johnston, John T.Dewolf, etc., Mechanics of Materials (5th edition) (M), New York, Mc Graw Hill, 2009). In the calculation of concrete beam structures, the influence of shear stress is mostly ignored (Li Liankun, Structural Mechanics (5th Edition) (M), Beijing: Higher Education Press, 2010), and in recent ten years, concrete structures especially The problem of long-term excessive deformation of long-span concrete beam structures began to appear, and the actual deformation value was often greater than the calculated value (Lou Zhuanghong, Major diseases of long-span...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/28
Inventor 牛艳伟商岸帆冯剑平荣帅曹宏恩杜隆基黄平明
Owner CHANGAN UNIV
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