The Experts below are selected from a list of 8328 Experts worldwide ranked by ideXlab platform
Younghwan Park - One of the best experts on this subject based on the ideXlab platform.
-
estimation of Prestress force distribution in multi strand system of Prestressed concrete structures using field data measured by electromagnetic sensor
Sensors, 2016Co-Authors: Keunhee Cho, Jeong-rae Cho, Sung Yong Park, Sung Tae Kim, Youngjin Kim, Younghwan ParkAbstract:The recently developed smart strand can be used to measure the Prestress force in the Prestressed concrete (PSC) structure from the construction stage to the in-service stage. The higher cost of the smart strand compared to the conventional strand renders it unaffordable to replace all the strands by smart strands, and results in the application of only a limited number of smart strands in the PSC structure. However, the Prestress forces developed in the strands of the multi-strand system frequently adopted in PSC structures differ from each other, which means that the Prestress force in the multi-strand system cannot be obtained by simple proportional scaling using the measurement of the smart strand. Therefore, this study examines the Prestress force distribution in the multi-strand system to find the correlation between the Prestress force measured by the smart strand and the Prestress force distribution in the multi-strand system. To that goal, the Prestress force distribution was measured using electromagnetic sensors for various factors of the multi-strand system adopted on site in the fabrication of actual PSC girders. The results verified the possibility to assume normal distribution for the Prestress force distribution per anchor head, and a method computing the mean and standard deviation defining the normal distribution is proposed. This paper presents a meaningful finding by proposing an estimation method of the Prestress force based upon field-measured data of the Prestress force distribution in the multi-strand system of actual PSC structures.
-
estimation of Prestress force distribution in the multi strand system of Prestressed concrete structures
Sensors, 2015Co-Authors: Keunhee Cho, Jeong-rae Cho, Sung Yong Park, Sung Tae Kim, Younghwan ParkAbstract:Prestressed concrete (PSC) is one of the most reliable, durable and widely used construction materials, which overcomes the weakness of concrete in tension by the introduction of a Prestress force. Smart strands enabling measurement of the Prestress force have recently been developed to maintain PSC structures throughout their lifetime. However, the smart strand cannot give a representative indication of the whole Prestress force when used in multi-strand systems since each strand sustains a different Prestress force. In this paper, the actual distribution of the Prestress force in a multi-strand system is examined using elastomagnetic (EM) sensors to develop a method for tracking representative indicators of the Prestress force using smart strands.
-
A sensor-type PC strand with an embedded FBG sensor for monitoring Prestress forces
Sensors (Switzerland), 2015Co-Authors: Sung Tae Kim, Keunhee Cho, Younghwan Park, Sung Yong Park, Jeong-rae ChoAbstract:Prestressed Concrete Wire and Strand (PC) strands are the most used materials to introduce Prestress in a Pre-Stressed Concrete (PSC) structure. However, it is difficult to evaluate the final Prestress force of the PC strand after Prestressing or its residual Prestress force after completion of the structure on site. This impossibility to assess eventual loss of Prestress of the PC strand has resulted in a number of serious accidents and even in the collapse of several structures. This situation stresses the necessity to maintain the Prestress force residual or after Prestressing for the evaluation of the health of the concrete structure throughout its lifespan. Recently, several researchers have studied methods enabling one to verify the Prestress force by inserting an optical fiber sensor inside the strand but failed to provide simple techniques for the fabrication of these devices to fulfill measurement performance from the design Prestress to failure. Moreover, these methods require the additional installation of electrical resistance strain gages, displacement sensors and load cells on the outer surface of the structure for long-term precise measurement. This paper proposes a method enabling one to evaluate precisely and effectively the Prestress force of the PC strand and intends to verify the applicability of the proposed method on actual concrete structures. To that end, an innovative PC strand is developed by embedding a Fiber Bragg Grating (FBG) sensor in the core wire of the PC strand so as to enable short term as well as long term monitoring. The measurement performance of the developed strand is then evaluated experimentally and the reliability of the monitoring data is assessed.
Jeong-rae Cho - One of the best experts on this subject based on the ideXlab platform.
-
estimation of Prestress force distribution in multi strand system of Prestressed concrete structures using field data measured by electromagnetic sensor
Sensors, 2016Co-Authors: Keunhee Cho, Jeong-rae Cho, Sung Yong Park, Sung Tae Kim, Youngjin Kim, Younghwan ParkAbstract:The recently developed smart strand can be used to measure the Prestress force in the Prestressed concrete (PSC) structure from the construction stage to the in-service stage. The higher cost of the smart strand compared to the conventional strand renders it unaffordable to replace all the strands by smart strands, and results in the application of only a limited number of smart strands in the PSC structure. However, the Prestress forces developed in the strands of the multi-strand system frequently adopted in PSC structures differ from each other, which means that the Prestress force in the multi-strand system cannot be obtained by simple proportional scaling using the measurement of the smart strand. Therefore, this study examines the Prestress force distribution in the multi-strand system to find the correlation between the Prestress force measured by the smart strand and the Prestress force distribution in the multi-strand system. To that goal, the Prestress force distribution was measured using electromagnetic sensors for various factors of the multi-strand system adopted on site in the fabrication of actual PSC girders. The results verified the possibility to assume normal distribution for the Prestress force distribution per anchor head, and a method computing the mean and standard deviation defining the normal distribution is proposed. This paper presents a meaningful finding by proposing an estimation method of the Prestress force based upon field-measured data of the Prestress force distribution in the multi-strand system of actual PSC structures.
-
estimation of Prestress force distribution in the multi strand system of Prestressed concrete structures
Sensors, 2015Co-Authors: Keunhee Cho, Jeong-rae Cho, Sung Yong Park, Sung Tae Kim, Younghwan ParkAbstract:Prestressed concrete (PSC) is one of the most reliable, durable and widely used construction materials, which overcomes the weakness of concrete in tension by the introduction of a Prestress force. Smart strands enabling measurement of the Prestress force have recently been developed to maintain PSC structures throughout their lifetime. However, the smart strand cannot give a representative indication of the whole Prestress force when used in multi-strand systems since each strand sustains a different Prestress force. In this paper, the actual distribution of the Prestress force in a multi-strand system is examined using elastomagnetic (EM) sensors to develop a method for tracking representative indicators of the Prestress force using smart strands.
-
A sensor-type PC strand with an embedded FBG sensor for monitoring Prestress forces
Sensors (Switzerland), 2015Co-Authors: Sung Tae Kim, Keunhee Cho, Younghwan Park, Sung Yong Park, Jeong-rae ChoAbstract:Prestressed Concrete Wire and Strand (PC) strands are the most used materials to introduce Prestress in a Pre-Stressed Concrete (PSC) structure. However, it is difficult to evaluate the final Prestress force of the PC strand after Prestressing or its residual Prestress force after completion of the structure on site. This impossibility to assess eventual loss of Prestress of the PC strand has resulted in a number of serious accidents and even in the collapse of several structures. This situation stresses the necessity to maintain the Prestress force residual or after Prestressing for the evaluation of the health of the concrete structure throughout its lifespan. Recently, several researchers have studied methods enabling one to verify the Prestress force by inserting an optical fiber sensor inside the strand but failed to provide simple techniques for the fabrication of these devices to fulfill measurement performance from the design Prestress to failure. Moreover, these methods require the additional installation of electrical resistance strain gages, displacement sensors and load cells on the outer surface of the structure for long-term precise measurement. This paper proposes a method enabling one to evaluate precisely and effectively the Prestress force of the PC strand and intends to verify the applicability of the proposed method on actual concrete structures. To that end, an innovative PC strand is developed by embedding a Fiber Bragg Grating (FBG) sensor in the core wire of the PC strand so as to enable short term as well as long term monitoring. The measurement performance of the developed strand is then evaluated experimentally and the reliability of the monitoring data is assessed.
Keunhee Cho - One of the best experts on this subject based on the ideXlab platform.
-
estimation of Prestress force distribution in multi strand system of Prestressed concrete structures using field data measured by electromagnetic sensor
Sensors, 2016Co-Authors: Keunhee Cho, Jeong-rae Cho, Sung Yong Park, Sung Tae Kim, Youngjin Kim, Younghwan ParkAbstract:The recently developed smart strand can be used to measure the Prestress force in the Prestressed concrete (PSC) structure from the construction stage to the in-service stage. The higher cost of the smart strand compared to the conventional strand renders it unaffordable to replace all the strands by smart strands, and results in the application of only a limited number of smart strands in the PSC structure. However, the Prestress forces developed in the strands of the multi-strand system frequently adopted in PSC structures differ from each other, which means that the Prestress force in the multi-strand system cannot be obtained by simple proportional scaling using the measurement of the smart strand. Therefore, this study examines the Prestress force distribution in the multi-strand system to find the correlation between the Prestress force measured by the smart strand and the Prestress force distribution in the multi-strand system. To that goal, the Prestress force distribution was measured using electromagnetic sensors for various factors of the multi-strand system adopted on site in the fabrication of actual PSC girders. The results verified the possibility to assume normal distribution for the Prestress force distribution per anchor head, and a method computing the mean and standard deviation defining the normal distribution is proposed. This paper presents a meaningful finding by proposing an estimation method of the Prestress force based upon field-measured data of the Prestress force distribution in the multi-strand system of actual PSC structures.
-
estimation of Prestress force distribution in the multi strand system of Prestressed concrete structures
Sensors, 2015Co-Authors: Keunhee Cho, Jeong-rae Cho, Sung Yong Park, Sung Tae Kim, Younghwan ParkAbstract:Prestressed concrete (PSC) is one of the most reliable, durable and widely used construction materials, which overcomes the weakness of concrete in tension by the introduction of a Prestress force. Smart strands enabling measurement of the Prestress force have recently been developed to maintain PSC structures throughout their lifetime. However, the smart strand cannot give a representative indication of the whole Prestress force when used in multi-strand systems since each strand sustains a different Prestress force. In this paper, the actual distribution of the Prestress force in a multi-strand system is examined using elastomagnetic (EM) sensors to develop a method for tracking representative indicators of the Prestress force using smart strands.
-
A sensor-type PC strand with an embedded FBG sensor for monitoring Prestress forces
Sensors (Switzerland), 2015Co-Authors: Sung Tae Kim, Keunhee Cho, Younghwan Park, Sung Yong Park, Jeong-rae ChoAbstract:Prestressed Concrete Wire and Strand (PC) strands are the most used materials to introduce Prestress in a Pre-Stressed Concrete (PSC) structure. However, it is difficult to evaluate the final Prestress force of the PC strand after Prestressing or its residual Prestress force after completion of the structure on site. This impossibility to assess eventual loss of Prestress of the PC strand has resulted in a number of serious accidents and even in the collapse of several structures. This situation stresses the necessity to maintain the Prestress force residual or after Prestressing for the evaluation of the health of the concrete structure throughout its lifespan. Recently, several researchers have studied methods enabling one to verify the Prestress force by inserting an optical fiber sensor inside the strand but failed to provide simple techniques for the fabrication of these devices to fulfill measurement performance from the design Prestress to failure. Moreover, these methods require the additional installation of electrical resistance strain gages, displacement sensors and load cells on the outer surface of the structure for long-term precise measurement. This paper proposes a method enabling one to evaluate precisely and effectively the Prestress force of the PC strand and intends to verify the applicability of the proposed method on actual concrete structures. To that end, an innovative PC strand is developed by embedding a Fiber Bragg Grating (FBG) sensor in the core wire of the PC strand so as to enable short term as well as long term monitoring. The measurement performance of the developed strand is then evaluated experimentally and the reliability of the monitoring data is assessed.
Sung Tae Kim - One of the best experts on this subject based on the ideXlab platform.
-
estimation of Prestress force distribution in multi strand system of Prestressed concrete structures using field data measured by electromagnetic sensor
Sensors, 2016Co-Authors: Keunhee Cho, Jeong-rae Cho, Sung Yong Park, Sung Tae Kim, Youngjin Kim, Younghwan ParkAbstract:The recently developed smart strand can be used to measure the Prestress force in the Prestressed concrete (PSC) structure from the construction stage to the in-service stage. The higher cost of the smart strand compared to the conventional strand renders it unaffordable to replace all the strands by smart strands, and results in the application of only a limited number of smart strands in the PSC structure. However, the Prestress forces developed in the strands of the multi-strand system frequently adopted in PSC structures differ from each other, which means that the Prestress force in the multi-strand system cannot be obtained by simple proportional scaling using the measurement of the smart strand. Therefore, this study examines the Prestress force distribution in the multi-strand system to find the correlation between the Prestress force measured by the smart strand and the Prestress force distribution in the multi-strand system. To that goal, the Prestress force distribution was measured using electromagnetic sensors for various factors of the multi-strand system adopted on site in the fabrication of actual PSC girders. The results verified the possibility to assume normal distribution for the Prestress force distribution per anchor head, and a method computing the mean and standard deviation defining the normal distribution is proposed. This paper presents a meaningful finding by proposing an estimation method of the Prestress force based upon field-measured data of the Prestress force distribution in the multi-strand system of actual PSC structures.
-
estimation of Prestress force distribution in the multi strand system of Prestressed concrete structures
Sensors, 2015Co-Authors: Keunhee Cho, Jeong-rae Cho, Sung Yong Park, Sung Tae Kim, Younghwan ParkAbstract:Prestressed concrete (PSC) is one of the most reliable, durable and widely used construction materials, which overcomes the weakness of concrete in tension by the introduction of a Prestress force. Smart strands enabling measurement of the Prestress force have recently been developed to maintain PSC structures throughout their lifetime. However, the smart strand cannot give a representative indication of the whole Prestress force when used in multi-strand systems since each strand sustains a different Prestress force. In this paper, the actual distribution of the Prestress force in a multi-strand system is examined using elastomagnetic (EM) sensors to develop a method for tracking representative indicators of the Prestress force using smart strands.
-
A sensor-type PC strand with an embedded FBG sensor for monitoring Prestress forces
Sensors (Switzerland), 2015Co-Authors: Sung Tae Kim, Keunhee Cho, Younghwan Park, Sung Yong Park, Jeong-rae ChoAbstract:Prestressed Concrete Wire and Strand (PC) strands are the most used materials to introduce Prestress in a Pre-Stressed Concrete (PSC) structure. However, it is difficult to evaluate the final Prestress force of the PC strand after Prestressing or its residual Prestress force after completion of the structure on site. This impossibility to assess eventual loss of Prestress of the PC strand has resulted in a number of serious accidents and even in the collapse of several structures. This situation stresses the necessity to maintain the Prestress force residual or after Prestressing for the evaluation of the health of the concrete structure throughout its lifespan. Recently, several researchers have studied methods enabling one to verify the Prestress force by inserting an optical fiber sensor inside the strand but failed to provide simple techniques for the fabrication of these devices to fulfill measurement performance from the design Prestress to failure. Moreover, these methods require the additional installation of electrical resistance strain gages, displacement sensors and load cells on the outer surface of the structure for long-term precise measurement. This paper proposes a method enabling one to evaluate precisely and effectively the Prestress force of the PC strand and intends to verify the applicability of the proposed method on actual concrete structures. To that end, an innovative PC strand is developed by embedding a Fiber Bragg Grating (FBG) sensor in the core wire of the PC strand so as to enable short term as well as long term monitoring. The measurement performance of the developed strand is then evaluated experimentally and the reliability of the monitoring data is assessed.
Sung Yong Park - One of the best experts on this subject based on the ideXlab platform.
-
estimation of Prestress force distribution in multi strand system of Prestressed concrete structures using field data measured by electromagnetic sensor
Sensors, 2016Co-Authors: Keunhee Cho, Jeong-rae Cho, Sung Yong Park, Sung Tae Kim, Youngjin Kim, Younghwan ParkAbstract:The recently developed smart strand can be used to measure the Prestress force in the Prestressed concrete (PSC) structure from the construction stage to the in-service stage. The higher cost of the smart strand compared to the conventional strand renders it unaffordable to replace all the strands by smart strands, and results in the application of only a limited number of smart strands in the PSC structure. However, the Prestress forces developed in the strands of the multi-strand system frequently adopted in PSC structures differ from each other, which means that the Prestress force in the multi-strand system cannot be obtained by simple proportional scaling using the measurement of the smart strand. Therefore, this study examines the Prestress force distribution in the multi-strand system to find the correlation between the Prestress force measured by the smart strand and the Prestress force distribution in the multi-strand system. To that goal, the Prestress force distribution was measured using electromagnetic sensors for various factors of the multi-strand system adopted on site in the fabrication of actual PSC girders. The results verified the possibility to assume normal distribution for the Prestress force distribution per anchor head, and a method computing the mean and standard deviation defining the normal distribution is proposed. This paper presents a meaningful finding by proposing an estimation method of the Prestress force based upon field-measured data of the Prestress force distribution in the multi-strand system of actual PSC structures.
-
estimation of Prestress force distribution in the multi strand system of Prestressed concrete structures
Sensors, 2015Co-Authors: Keunhee Cho, Jeong-rae Cho, Sung Yong Park, Sung Tae Kim, Younghwan ParkAbstract:Prestressed concrete (PSC) is one of the most reliable, durable and widely used construction materials, which overcomes the weakness of concrete in tension by the introduction of a Prestress force. Smart strands enabling measurement of the Prestress force have recently been developed to maintain PSC structures throughout their lifetime. However, the smart strand cannot give a representative indication of the whole Prestress force when used in multi-strand systems since each strand sustains a different Prestress force. In this paper, the actual distribution of the Prestress force in a multi-strand system is examined using elastomagnetic (EM) sensors to develop a method for tracking representative indicators of the Prestress force using smart strands.
-
A sensor-type PC strand with an embedded FBG sensor for monitoring Prestress forces
Sensors (Switzerland), 2015Co-Authors: Sung Tae Kim, Keunhee Cho, Younghwan Park, Sung Yong Park, Jeong-rae ChoAbstract:Prestressed Concrete Wire and Strand (PC) strands are the most used materials to introduce Prestress in a Pre-Stressed Concrete (PSC) structure. However, it is difficult to evaluate the final Prestress force of the PC strand after Prestressing or its residual Prestress force after completion of the structure on site. This impossibility to assess eventual loss of Prestress of the PC strand has resulted in a number of serious accidents and even in the collapse of several structures. This situation stresses the necessity to maintain the Prestress force residual or after Prestressing for the evaluation of the health of the concrete structure throughout its lifespan. Recently, several researchers have studied methods enabling one to verify the Prestress force by inserting an optical fiber sensor inside the strand but failed to provide simple techniques for the fabrication of these devices to fulfill measurement performance from the design Prestress to failure. Moreover, these methods require the additional installation of electrical resistance strain gages, displacement sensors and load cells on the outer surface of the structure for long-term precise measurement. This paper proposes a method enabling one to evaluate precisely and effectively the Prestress force of the PC strand and intends to verify the applicability of the proposed method on actual concrete structures. To that end, an innovative PC strand is developed by embedding a Fiber Bragg Grating (FBG) sensor in the core wire of the PC strand so as to enable short term as well as long term monitoring. The measurement performance of the developed strand is then evaluated experimentally and the reliability of the monitoring data is assessed.
