scholarly journals Damage Assessment of Concrete under Wind-Sand Load

2022 ◽  
Vol 2148 (1) ◽  
pp. 012033
Author(s):  
Ying Jia ◽  
Zhiwei Xie
Keyword(s):  
Stress State ◽  
Damage Assessment ◽  
Wind Erosion ◽  
Critical Pressure ◽  
Assessment Index ◽  
Erosion Damage ◽  
Concrete Members ◽  
Flow Parameters ◽  
Sand Flow ◽  
Stress Fatigue

Abstract In this paper, a numerical model of wind-sand flow is established to explore the influence of wind-sand flow parameters on the stress state of the concrete. According to the contact mechanics theory, the wind erosion critical pressure of concrete members and the corresponding stress state of concrete are analyzed. A wind erosion damage assessment index based on stress fatigue theory is proposed.

scholarly journals SVM-Based Detection of Miniature Area of LCLU: A False-Damage Assessment Index for Disaster Management Application

2019 ◽  
Vol 8 (4) ◽  
pp. 10957-10962
Keyword(s):  
Supervised Learning ◽  
Detection Probability ◽  
Damage Assessment ◽  
Learning Algorithm ◽  
Support Vector ◽  
Binary Classifier ◽  
Assessment Index ◽  
Vector Machines ◽  
Management Application ◽  
Two Parameters

In this paper, we reflect on changing the detection environment for addressing the difficulty of detecting miniature area of Land Cover Land Use (LCLU) with a technique using Support Vector Machines (SVMs).We then become accustomed and sophisticatedly changing the Support Vector Machine for designing a supervised learning basis detection that enfolds the False Damage Assessment Index(FDAI). Primarily our proposed detection technique is controls easily the FDAI by simply adjusting two parameters() where it can be facilitate to control sensitivity of detection to the binary classifier and numerical supervised learning algorithm. The experimental results demonstrating about ours proposing detector noticeably improving the detection probability on many existing classifiers in both DAI and FDAI cases .

Influence of Water Content on Dynamic Elastic Modulus of Concrete

2013 ◽  
Vol 351-352 ◽  
pp. 1605-1609
Author(s):  
Fang Zhi Zhu ◽  
Tie Jun Zhao ◽  
Ting Guan
Keyword(s):  
Elastic Modulus ◽  
Water Content ◽  
Damage Assessment ◽  
Dynamic Elastic Modulus ◽  
Bending Vibration ◽  
Assessment Index ◽  
Content Change ◽  
Influence Of Water ◽  
Set Up ◽  
Low Sensitivity

Water content is one of key effect factors on the dynamic elastic modulus, which is an important damage assessment index of concrete structures induced by freeze-thaw cycles, fire and chemical attacks. Through the ultrasonic and bending vibration test, the regularity of dynamic elastic modulus changed with the water content of concrete specimens was analyzed in this paper. The results show that the ultrasonic velocity has a low sensitivity to water content when it is below 1.5%. The bending vibration method can better reflect the effect of water content change on dynamic elastic modulus. The regression equation of dynamic elastic modulus and water content was set up by introducing the index function. The research results offer technical reference for the predicting of actual concrete dynamic elastic modulus in different humidity environment.

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