THE INFLUENCE OF OFF-CENTER HITTING ON THE SIGNALS IN HIGH STRAIN DYNAMIC TEST

Zhang Wuyu; Wang Xuefeng; Gan Yi; Tian Dongjun; Xin Yuanyue

doi:10.13204/j.gyjz201008022

Volume 40 Issue 8

Dec. 2014

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2010 > 40(8): 95-98,60

Wang Yuanqing, Lin Yun, Zhang Yannian, Shi Gang, Shi Yongjiu. EXPERIMENTAL STUDY ON THE IMPACT TOUGHNESS OF Q460-C HIGH-STRENGTH CONSTRUCTION STEEL AT LOW TEMPERATURE[J]. INDUSTRIAL CONSTRUCTION, 2012, 42(1): 8-12,102. doi: 10.13204/j.gyjz201201002

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Zhang Wuyu, Wang Xuefeng, Gan Yi, Tian Dongjun, Xin Yuanyue. THE INFLUENCE OF OFF-CENTER HITTING ON THE SIGNALS IN HIGH STRAIN DYNAMIC TEST[J]. INDUSTRIAL CONSTRUCTION, 2010, 40(8): 95-98,60. doi: 10.13204/j.gyjz201008022

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THE INFLUENCE OF OFF-CENTER HITTING ON THE SIGNALS IN HIGH STRAIN DYNAMIC TEST

doi: 10.13204/j.gyjz201008022

1.
1. Civil Engineering Department of Qinghai University,Xining 810016,China;
2.
2. School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China;
3.
3. Hubei Academy of Building Research,Wuhan 430071,China

Received Date: 2010-01-28
Publish Date: 2010-08-20

Abstract

Abstract

It is very easy to lead to off-center hitting when the gravity center of hammer and the top of the pile is not right or the drop hammer device frame is not vertical in a high strain dynamic test,which then produces a significant impact on the signals of sensors that are on a hammer and the side of a pile. This paper made simulation study of offcenter hitting for high strain dynamic test piles based on two different installation methods of sensors; it was analyzed in detail the reasonableness of two kinds of high strain dynamic tests and their correct installation schemes with an emphasis on the effects of off-center hitting to the speed of each part and strain of the pile. The simulation explains the phenomena found in the practice such as the strain severely affected by off-center hitting,and less impact on the speed,which corrects the misconception that big piles need more sensors to over the impact of the off-center hitting.
- dynamic test of pile foundation,
- hammer,
- high strain,
- off-center hitting,
- sensor

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