A deformation cyclic damage calculation method

A calculation method and non-damage technology, applied in calculation, instrumentation, electrical digital data processing, etc., can solve problems such as complex calculation methods, seldom studied cyclic damage of specimens, and the definition of damage starting point does not conform to the actual situation, etc., to achieve simple calculation Effect

Active Publication Date: 2019-06-14
HOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the damage calculation methods have the following deficiencies: 1) The existing calculation methods are relatively complicated, and the definition of the damage starting point does not conform to the actual situation; 2) There are few studies on the cyclic damage of the specimen, which is not enough to reflect the structure in the actual earthquake damage and damage

Method used

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  • A deformation cyclic damage calculation method
  • A deformation cyclic damage calculation method
  • A deformation cyclic damage calculation method

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Effect test

Embodiment 1

[0046] A deformation cyclic damage calculation method with the initial loading point as the damage starting point, comprising the following steps:

[0047] Step 1, establish the first skeleton curve and the second skeleton curve; the first skeleton curve and the second skeleton curve are determined by the load-displacement curve; Displacement-controlled loading regime, loading regime such as figure 2 shown. Load control loading regime such as figure 2 As shown in (a), under each level of load control, only one loading is performed; the displacement control loading system is as follows figure 2 As shown in (b), under each level of displacement control, three cycles of loading are required. According to the loading system to load the specimen, it can be obtained as image 3 The load-displacement curves are shown. Since in the displacement control stage, the load is cyclically loaded three times under each level of displacement control, so there are three hysteresis loops...

Embodiment 2

[0065] A deformation cycle damage calculation method with a self-defined damage starting point, comprising the following steps:

[0066] Step 1, establish the first skeleton curve and the second skeleton curve; the skeleton curve is determined by the load-displacement curve; in the seismic test research, the loading system of first load control and then displacement control can be adopted, and the loading system Such as figure 2 shown. Load control loading regime such as figure 2 As shown in (a), under each level of load control, only one loading is performed; the displacement control loading system is as follows figure 2 As shown in (b), under each level of displacement control, three cycles of loading are required. According to the loading system to load the specimen, it can be obtained as image 3 The load-displacement curves are shown. Since in the displacement control stage, the load is cyclically loaded three times under each level of displacement control, so the...

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Abstract

The invention discloses a deformation cyclic damage calculation method. The method comprises the following steps: establishing a first skeleton curve and a second skeleton curve according to a load displacement curve; determining the damage-free slope k1 of the skeleton curve, the peak load Pm of the skeleton curve and the damage point of the test piece; determining characteristic loads PEi, PRi,PCi and Pi under each stage of displacement control; and determining damage values Ddi, DCi and DRi according to a damage calculation formula. According to the method, the load displacement curve obtained by test loading is utilized, the bearing capacity is used as a basic factor for evaluating the damage condition, the loading initial point is used as a damage starting point or a self-defined damage starting point, the influence of cyclic loading on the damage of the test piece under the same displacement is considered, and a new method and a new idea are provided for structural seismic damage research.

Description

technical field [0001] The invention belongs to the field of structure damage calculation, in particular to a deformation cycle damage calculation method. Background technique [0002] Since the earthquake will cause damage to the building structure, and the damage will gradually accumulate with the increase of the number of cycles, so the building structure will have a significant impact on its bearing capacity and remaining life during the subsequent service period after being damaged by multiple earthquakes. And the damage calculation method of the structure under the earthquake is the theoretical basis of the structure's seismic design, and its internal damage is an important basis for the post-earthquake reinforcement of the structure. Therefore, it is of great significance to correctly grasp the damage level of the structure under the earthquake and to seek a reasonable calculation method to quantitatively describe the damage of the structural components under the eart...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCY02E60/00
Inventor 伍凯翟江棚郑惠铭谭程炜林诗琪
Owner HOHAI UNIV
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