scholarly journals Bamboo Reinforcement Concrete Beam as Innovation for Low-cost Earthquake Resistant House

2020 ◽  
Vol 1625 ◽  
pp. 012026
Author(s):  
N Hidayat ◽  
A Aldo
Keyword(s):  
Concrete Beam ◽  
Low Cost ◽  
Earthquake Resistant ◽  
Bamboo Reinforcement

scholarly journals Flexural Behavior of Bamboo Reinforced Concrete Beam with Steel Stirrups

2019 ◽  
Vol 8 (4S2) ◽  
pp. 97-99
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Reinforced Concrete Beam ◽  
Flexural Behavior ◽  
Test Results ◽  
Steel Reinforced Concrete ◽  
Beam Design ◽  
Materials Used ◽  
Bamboo Reinforcement

The flexural behavior of concrete beams reinforced with bamboo was studied experimentally. Bamboo was used as the main reinforcement with different bonding materials in place of steel. A nominal mix of M20 grade concrete was adopted for the beam design. The Bamboo surface was treated with common binding materials like Araldite and Bitumen. Araldite and Bitumen are good binding materials used to connect materials like steel, carbon and many different materials. Two specimens were casted with bitumen coating, two specimens were coated with araldite, two specimens were casted without any binder coating and a specimen was casted using normal steel reinforcement. Beams were casted with bamboo reinforcement and cured for 28 days. Deflection and flexural behavior of the beams were monitored. The test results imply that araldite coating in concrete beams with bamboo reinforcement increased the flexural strength to that of bamboo reinforced concrete using bitumen which is lesser strength to that of steel reinforced concrete beam.

scholarly journals Debonding Detection and Monitoring for CFRP Reinforced Concrete Beams Using Pizeoceramic Sensors

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2150 ◽  
Author(s):  
Shukui Liu ◽  
Wei Sun ◽  
Hongwen Jing ◽  
Zhaoxing Dong
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Low Cost ◽  
Ultrasonic Waves ◽  
Reinforced Concrete Beams ◽  
Bending Test ◽  
Cfrp Sheet ◽  
Debonding Detection

The bonding status between Carbon Fiber Reinforced Polymer (CFRP) and concrete is one of the key issues for the safety of CFPR-reinforced structures, thus it is of great importance to detect the debonding as early as possible. Instead of detecting the debonding which is artificially set at the very beginning, this paper investigates the feasibility of using low-cost piezoceramic sensors to detect and monitor the debonding of CFRP-reinforced concrete beams in situ. For existing debonding detection, a concrete beam reinforced with CFRP sheet was loaded through the three-point bending test till failure to induce debonding between CFRP sheet and the concrete substrate, and piezoceramic sensors were used to detect the existing debonding by analyzing the receiving ultrasonic waves. In addition, the debonding detection results were further compared with and verified by the vision-based strain testing results. For in-situ debonding monitoring, 10 piezoceramic sensors were used as an array to track the wave transmission changes during the loading process of a CFRP-reinforced concrete beam, and the debonding development process was successfully monitored. The test results show that the low-cost piezoceramic sensors are very effective to generate and receive ultrasonic waves, and are capable of detecting the existing debonding and monitoring of the in-situ debonding process as well.

scholarly journals Concrete Crack Detection and Monitoring Using a Capacitive Dense Sensor Array

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1843 ◽  
Author(s):  
Jin Yan ◽  
Austin Downey ◽  
Alessandro Cancelli ◽  
Simon Laflamme ◽  
An Chen ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Concrete Beam ◽  
Crack Detection ◽  
Low Cost ◽  
Fatigue Cracks ◽  
Concrete Structures ◽  
Structural Safety ◽  
Small Scale ◽  
Sensing Skin ◽  
Post Tensioned

Cracks in concrete structures can be indicators of important damage and may significantly affect durability. Their timely identification can be used to ensure structural safety and guide on-time maintenance operations. Structural health monitoring solutions, such as strain gauges and fiber optics systems, have been proposed for the automatic monitoring of such cracks. However, these solutions become economically difficult to deploy when the surface under investigation is very large. This paper proposes to leverage a novel sensing skin for monitoring cracks in concrete structures. This sensing skin is constituted of a flexible electronic termed soft elastomeric capacitor, which detects a change in strain through changes in measured capacitance. The SEC is a low-cost, durable, and robust sensing technology that has previously been studied for the monitoring of fatigue cracks in steel components. In this study, the sensing skin is introduced and preliminary validation results on a small-scale reinforced concrete beam are presented. The technology is verified on a full-scale post-tensioned concrete beam. Results show that the sensing skin is capable of detecting, localizing, and quantifying cracks that formed in both the reinforced and post-tensioned concrete specimens.

scholarly journals Attenuation of sound radiation in concrete structure through the reduction of mechanical vibration

2018 ◽  
Vol 11 (1) ◽  
pp. 95-114
Author(s):  
R. V. DE HOLANDA ◽  
M. A. V. DUARTE ◽  
M. A. B. C. BADAN ◽  
J. L. DE O. PENA ◽  
R. C. ROSA
Keyword(s):  
Frequency Band ◽  
Concrete Beam ◽  
Low Cost ◽  
Mechanical Vibration ◽  
System Structure ◽  
Primary System ◽  
Vibration Absorbers ◽  
Viable Option ◽  
Secondary Systems ◽  
Dynamic Vibration Absorbers

Abstract The efficiency of sound irradiance in structure has direct relation with its vibratory movement. Dynamic vibration absorbers (DVAs) are a low cost viable option for reducing vibrations in passive structures. Secondary systems attached to the primary system (structure) in order to reduce vibration. In this work it was used an experimental modal analysis procedure (EMA) for vibratory responses through impulsive excitations to determine the natural frequencies and the location of points suitable for attachment of DVAs in a concrete beam. Later it was designed and built DVAs to reduce vibration in a frequency band where the response of the human auditory system is more sensitive. The best project configuration for DVAs was evaluated for sensitivity thereof with respect to the change of the loss factor of the viscoelastic material used. Obtained reduction of more than 36% over the considered frequency band and over 70% in the region of the resonance frequency in which the DVAs were tuned.

scholarly journals Microtremor recording techniques

1973 ◽  
Vol 6 (2) ◽  
pp. 87-92
Author(s):  
I. M. Parton ◽  
P. W. Taylor
Keyword(s):  
Low Cost ◽  
Low Frequency ◽  
Tape Recorder ◽  
Frequency Content ◽  
High Quality ◽  
Recording Apparatus ◽  
Earthquake Resistant ◽  
Earthquake Resistant Structures ◽  
Microtremor Measurement ◽  
Modulation Methods

For some years seismologists and engineers have been recording and measuring microtremors. In this paper a review of earlier micotremor investigations is presented and microtremor recording apparatus developed at Auckland University Engineering School is described. Two distinct methods of recording have been developed. One uses a conventional low-cost tape recorder operating at reduced speed to record the low frequency signals. The other uses a frequency modulation methods and a high quality instrumentation tape recorder to accurately record signal levels. This paper is the first of a series of three. In the second, method of analysing microtremor records, with particular emphasis on their frequency content will be presented, while in the last of the series the application of microtremor measurement to the design of earthquake resistant structures will be critically examined.

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