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Precise detection device and detection method for stress of invitro prestressed steel beam

An in vitro prestressing and detection device technology, which is applied in the direction of measurement of the change force of the magnetic properties of the material caused by the applied stress, can solve the problems of easy damage and achieve the effect of improving the accuracy

Inactive Publication Date: 2014-01-22
RES INST OF HIGHWAY MINIST OF TRANSPORT
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Problems solved by technology

However, the grating sensor technology is also a contact measurement method, which is easily damaged in a complex construction environment.

Method used

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  • Precise detection device and detection method for stress of invitro prestressed steel beam
  • Precise detection device and detection method for stress of invitro prestressed steel beam
  • Precise detection device and detection method for stress of invitro prestressed steel beam

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Embodiment Construction

[0051] The implementation of the present invention is described below through specific examples and in conjunction with the accompanying drawings, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0052] figure 1 It is a structural schematic diagram of an in vitro prestressed steel tendon stress detection device of the present invention. Such as figure 1 As shown, the present invention is an in vitro prestressed steel bundle stress detection device, including: a plurality of magnetic sensors 10, magnetic sensor data acquisition device 11, vibration sensor 12, vibration data acquisit...

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Abstract

The invention discloses a precise detection device and a detection method for stress of an invitro prestressed steel beam. The method comprises the following steps that magnetic induction sensors are subjected to tensioning testing machine calibration; the magnetic induction sensors and a vibration sensor are mounted; a transient loss coefficient is determined by tensioning testing; an initial prestressed steel beam stress prediction model is acquired; after steel beam tensioning is accomplished, data of the vibration sensor is tested; transient vibration data after the tensioning is obtained; the transient invitro steel beam vibration frequency after the tensioning is calculated; measured values x of the magnetic induction sensors and the data of the vibration sensor are measured according to a predetermined target and the testing time after the tensioning; and a stress value is calculated. By combining a magnetic induction effect testing method and a vibration testing method, the method overcomes the disadvantage that a stress relaxation influence of an invitro prestressed steel beam stranded wire cannot be eliminated by separately using the magnetic induction sensors and a magnetic induction acquisition device for testing analysis, and the testing precision is improved effectively.

Description

technical field [0001] The invention relates to a detection device and method for the stress of a prestressed steel beam, in particular to an accurate detection device and method for the stress state of an external prestressed steel beam for accurately testing the stress state of an external prestressed steel beam. Background technique [0002] The externally prestressed steel beam is an important structural component of the steel-concrete joint section. The external prestressed state directly affects the structural stiffness and connection reliability of the steel-concrete joint section. The main span of the Oujiang Bridge adopts a hybrid beam structure. In order to effectively connect with concrete and improve its load-bearing performance, external prestressed beams are arranged inside the composite beam. The actual working state of external prestressing directly affects the load-bearing reliability of the composite beam. However, the current detection methods and means ca...

Claims

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Application Information

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IPC IPC(8): G01L1/12
Inventor 郑毅张科超陈建璋李万恒傅宇方
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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