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Model for predicting residual fatigue life of concrete member

A fatigue life, concrete technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as damage accumulation, failure to consider stress history, etc., to achieve a wide range of applications and high accuracy of calculation results.

Inactive Publication Date: 2015-11-11
科利尔环保科技有限责任公司
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  • Abstract
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Problems solved by technology

The most notable disadvantage is that the effect of the sequence of application of different stress levels is not considered, and failure is assumed to be an accumulation at the same rate for a given stress level, without taking into account past stress history

Method used

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  • Model for predicting residual fatigue life of concrete member
  • Model for predicting residual fatigue life of concrete member
  • Model for predicting residual fatigue life of concrete member

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with specific examples.

[0034] figure 1 Indicates the relationship curve between failure probability and loading times under a certain loading intensity condition, that is, PF~InN; figure 2 Indicates the relationship between damage D and n / N under a certain loading strength condition.

[0035] The invention effectively predicts the fatigue life of concrete under variable-amplitude fatigue loads in a simpler and more convenient manner. It utilizes the stress level S i case load n i The damage of concrete during the second cycle is the same as that at the reference stress level S 1 case load n 1 The basic concept of equivalence in sub-cycles. Therefore, for any i, it can be obtained here that at the stress level S i case load n i When the secondary cycle concrete damage is equivalent, the concrete is at the reference stress level S 1 The number of cycles loaded in case n it , this concept of...

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Abstract

The invention discloses a model for predicting residual fatigue life of a concrete member. The fatigue life of concrete under a random-amplitude fatigue load is effectively predicted more simply and conveniently. A basic conception that the damage situation of the concrete loaded for cycle times ni under a stress level Si is equivalent to that of the concrete loaded for cycle times n1 under a reference stress level S1 is utilized. For random i, the cycle times nit for loading the concrete under the reference stress level S1 when the damage situation of the concrete loaded for cycle times ni under the stress level Si is equivalent to that of the concrete loaded for cycle times nit under the reference stress level S1 can be obtained.

Description

technical field [0001] The invention relates to a model for predicting the remaining fatigue life of concrete components, in particular to a model for predicting the remaining loading times when the concrete components are subjected to variable amplitude loads. Background technique [0002] Currently, bridges, roads and offshore structures are constructed of concrete, however, they are often subject to repetitive fatigue loads. Therefore, these structures must have sufficient resistance to resist various types of fatigue loads. Since real structures are subjected to variable amplitude fatigue loads, it is necessary to establish a real model to accurately evaluate the fatigue damage accumulated inside the structure under such loading conditions. [0003] In practical situations, civil engineering structures are often subjected to cyclic loads of different amplitudes. It is well known that the fatigue behavior of concrete under loads of different amplitudes is different from...

Claims

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Application Information

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IPC IPC(8): G06F19/00G06F17/50
Inventor 陈徐东邵羽孙宇辰卜静武
Owner 科利尔环保科技有限责任公司
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