Method for determining elastic modulus and flexural rigidity of reinforced concrete beam with crack

A technology for reinforced concrete beams and flexural stiffness, which is applied in the direction of applying stable tension/compression to test the strength of materials, joists, girders, etc., and can solve problems such as reasonable design of unfavorable engineering structures and large calculation errors.

Inactive Publication Date: 2010-12-22
CHONGQING ZHONGKE CONSTR GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, still using the classic equal modulus elasticity theory to determine the flexural stiffness of cracked reinforced concre

Method used

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  • Method for determining elastic modulus and flexural rigidity of reinforced concrete beam with crack
  • Method for determining elastic modulus and flexural rigidity of reinforced concrete beam with crack
  • Method for determining elastic modulus and flexural rigidity of reinforced concrete beam with crack

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Embodiment Construction

[0024] Test piece production

[0025] make a length of , width is , Gao Wei Rectangular cross-section reinforced concrete beam, as the specimen to be tested, where . Both ends of the specimen are supported by hinged supports, and the distance between the upper surface of the beam and the supports At each place, set a thickened rectangle Load the steel backing plate, where is the length of the steel backing plate loaded rectangularly along the beam width direction, For the length of the rectangularly loaded steel backing plate along the span direction of the beam, the required , to satisfy the mechanical model of a simply supported beam under concentrated load, such as figure 1 shown.

[0026] Experimental instrument installation

[0027] Such as figure 2 As shown, a resistance strain gauge is attached to the bottom of the middle span of the test piece, and the resistance strain gauge is connected to the strain gauge; a dial gauge deflection gauge is ...

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Abstract

The invention discloses a method for determining the elastic modulus and flexural rigidity of a reinforced concrete beam with a crack, relating to a tension Young's elastic modulus of a reinforced concrete beam with a crack in working, a measuring method of the tension Young's elastic modulus and a determining method of the flexural rigidity. A reinforced concrete beam with a rectangular cross section is manufactured as a test piece to be detected, and the length, width and height of the reinforced concrete beam are shown in the specification; the two ends of the test piece are supported by hinged supports; loads are intensively and symmetrically applied on the positions some distance away from at two points of the supports; the deflection value of the middle part of the test piece span and the strain value of the lowest end of the middle part of the test piece span are detected; a sum computed expression is deduced according to the analytic solution which is given by at theory of different tension-compression modulus under the condition that loading is performed on two points of a simple beam with a rectangular section intensively and symmetrically; and the sum can be accurately calculated by the load value, the defection value and the strain value. The sum determined by the invention contains a crack factor of the reinforced concrete beam within the given load range, and can be used for structural mechanic accurate analysis.

Description

technical field [0001] The present invention relates to Young's modulus of elasticity in tension for reinforced concrete beams working with cracks and Young's modulus of elasticity under compression The measurement method and the bending stiffness method of determination. Background technique [0002] The prefabricated reinforced concrete beams are used for loading tests to measure Young's modulus of elasticity and flexural stiffness, which has guiding significance for the design theory of reinforced concrete structures. At present, the measurement of the elastic modulus and the determination of the flexural stiffness of reinforced concrete beams are mostly based on the classic theory of equal modulus elasticity, that is, under the same absolute value of tensile and compressive stress, the material will produce the same absolute value of tensile and compressive strain. A large number of tests and studies have shown that under the same absolute value of tensile stress o...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01B21/32E04C3/20
Inventor 何晓婷孙俊贻许劲郑周练胡兴健朱海桥宁全润
Owner CHONGQING ZHONGKE CONSTR GROUP
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