Vehicles planning to exit at an upcoming freeway off-ramp require adequate exit distance to execute lane change maneuvers, otherwise, traffic disturbances may be experienced. This research assesses the changes in exit distances for a mixed traffic environment comprising automated vehicles (AVs) and human-driven vehicles (HDVs) on freeways with and without a managed lane (ML). A left-side continuous ML was designed, and eligible vehicles were AVs. Traffic microsimulation exercises were conducted on a 3.5-km freeway segment, and scenarios varied based on traffic demand, the number of freeway lanes, and AV adoption rates. Traffic demand was set relative to the queue discharge flow rate (qQ). The results indicated an increase in qQ as the AV adoption rate increased. Also, the exit distances were influenced by the traffic environment, the freeway configuration, and the traffic demand. The optimal exit distance increased when a ML was implemented at 25% and 50% AV adoption rates.
计划从即将到来的高速公路下匝道驶出的车辆需要足够的驶出距离来执行变道操作，否则可能会造成交通干扰。本研究评估了在有管理车道（ML）和无管理车道（ML）的高速公路上，由自动驾驶车辆（AV）和人工驾驶车辆（HDV）组成的混合交通环境中出口距离的变化。设计了左侧连续多车道，符合条件的车辆为自动驾驶汽车。在 3.5 公里长的高速公路路段上进行了交通微观模拟演练，并根据交通需求、高速公路车道数和 AV 采用率对情景进行了调整。交通需求是根据队列排放流量（qQ）设定的。结果表明，随着自动驾驶汽车采用率的增加，qQ 也在增加。此外，出口距离也受到交通环境、高速公路配置和交通需求的影响。当自动驾驶汽车采用率为 25% 和 50% 时，实施多路复用时，最佳出口距离会增加。
{"title":"Assessment of Automated Vehicles’ Freeway Exit Distances in Mixed and Managed Lane Traffic Environments","authors":"Jana McLean Sarran, Yasser Hassan","doi":"10.1139/cjce-2023-0396","DOIUrl":"https://doi.org/10.1139/cjce-2023-0396","url":null,"abstract":"Vehicles planning to exit at an upcoming freeway off-ramp require adequate exit distance to execute lane change maneuvers, otherwise, traffic disturbances may be experienced. This research assesses the changes in exit distances for a mixed traffic environment comprising automated vehicles (AVs) and human-driven vehicles (HDVs) on freeways with and without a managed lane (ML). A left-side continuous ML was designed, and eligible vehicles were AVs. Traffic microsimulation exercises were conducted on a 3.5-km freeway segment, and scenarios varied based on traffic demand, the number of freeway lanes, and AV adoption rates. Traffic demand was set relative to the queue discharge flow rate (qQ). The results indicated an increase in qQ as the AV adoption rate increased. Also, the exit distances were influenced by the traffic environment, the freeway configuration, and the traffic demand. The optimal exit distance increased when a ML was implemented at 25% and 50% AV adoption rates.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140719032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ashim Koirala, Emre Kizilarslan, Michel Bruneau, Robert Tremblay
Concrete-filled coupled composite plate shear walls (a.k.a. as SpeedCore walls) are gaining acceptance for construction in seismic region throughout North America. Design provisions for this lateral load-resisting system have already been added to ASCE 7-22 and to the American Institute of Steel Construction Seismic Design Provisions. Adequacy of the seismic design parameters used for this structural purpose have been validated in the USA using the FEMA P695 methodology. An interest was expressed by the practicing engineering community to use these walls in Canada, which requires demonstration of satisfactory seismic performance within the Canadian context. As such, new analyses are needed using Canadian-specific sets of ground motions to confirm the adequacy of the seismic design parameters proposed for implementation of these composite walls in the NBCC. This paper presents the results of these analyses, showing that the proposed seismic performance factors are appropriate for this structural system in Canada.
{"title":"Canadian seismic design coefficients for coupled composite plate shear wall/ concrete filled (CC-PSW/CF)","authors":"Ashim Koirala, Emre Kizilarslan, Michel Bruneau, Robert Tremblay","doi":"10.1139/cjce-2023-0137","DOIUrl":"https://doi.org/10.1139/cjce-2023-0137","url":null,"abstract":"Concrete-filled coupled composite plate shear walls (a.k.a. as SpeedCore walls) are gaining acceptance for construction in seismic region throughout North America. Design provisions for this lateral load-resisting system have already been added to ASCE 7-22 and to the American Institute of Steel Construction Seismic Design Provisions. Adequacy of the seismic design parameters used for this structural purpose have been validated in the USA using the FEMA P695 methodology. An interest was expressed by the practicing engineering community to use these walls in Canada, which requires demonstration of satisfactory seismic performance within the Canadian context. As such, new analyses are needed using Canadian-specific sets of ground motions to confirm the adequacy of the seismic design parameters proposed for implementation of these composite walls in the NBCC. This paper presents the results of these analyses, showing that the proposed seismic performance factors are appropriate for this structural system in Canada.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140716728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present study investigated the synergistic influence of coal bottom ash (CBA) on the shear strength of concrete. CBA was milled for 2,6, and 10 hours to form grinded CBA (GCBA). ‘L’ shaped specimens were prepared with 10-30% GCBA and 25-50% CBA as alternative of Portland cement (PC) and natural fine aggregates (NFA). Concrete containing 20% GCBA (grinded for six hours) and 25% CBA reported the highest shear strength owing to pozzolanic reactiveness and filler action. X ray diffraction (XRD), scanning electron microscopy- energy-dispersive spectroscopy (SEM-EDS) and Fourier transform infrared (FT-IR) also supported the experimental outcomes. Well fitted mathematical models were derived followed by optimization using desirability function approach recommending 5.71 hours of grinding, 26.27% GCBA and 36.69% CBA as the optimum amount for its successful utilization in concrete. This approach further leads to significant reduction of about 22% in carbon footprints and eco-costs in comparison to conventional concrete.
{"title":"Shear Strength Characterization and Sustainability Assessment of Coal Bottom Ash Concrete","authors":"Nitin Ankur, N. Singh","doi":"10.1139/cjce-2023-0307","DOIUrl":"https://doi.org/10.1139/cjce-2023-0307","url":null,"abstract":"The present study investigated the synergistic influence of coal bottom ash (CBA) on the shear strength of concrete. CBA was milled for 2,6, and 10 hours to form grinded CBA (GCBA). ‘L’ shaped specimens were prepared with 10-30% GCBA and 25-50% CBA as alternative of Portland cement (PC) and natural fine aggregates (NFA). Concrete containing 20% GCBA (grinded for six hours) and 25% CBA reported the highest shear strength owing to pozzolanic reactiveness and filler action. X ray diffraction (XRD), scanning electron microscopy- energy-dispersive spectroscopy (SEM-EDS) and Fourier transform infrared (FT-IR) also supported the experimental outcomes. Well fitted mathematical models were derived followed by optimization using desirability function approach recommending 5.71 hours of grinding, 26.27% GCBA and 36.69% CBA as the optimum amount for its successful utilization in concrete. This approach further leads to significant reduction of about 22% in carbon footprints and eco-costs in comparison to conventional concrete.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140726327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Prongmanee, Amorndech Noulmanee, Thawatchai Suppaso
Adhering to ASTM C109/C109M-20 standards ensures quality in cement mortar specimens. However, achieving the required sand gradation per ASTM C778-21 can be challenging. This paper presents a faster method for adjusting sand gradation without compromising ASTM quality standards. The proposed method involves analyzing six silica sand samples of different gradations, pre-screening sands, using Excel Solver for optimal mixture ratios, making automated gradation tweaks with precise calculations, and validating the gradation to ensure ASTM compliance. After making the adjustments, compressive strength tests were conducted on mortars with the modified sands, and the results were compared with those of standard-graded sand. Based on statistical analysis, the new method yielded reliable outcomes with compressive strengths similar to standard sands. This innovation offers a more efficient alternative, paving the way for streamlined practices in civil engineering.
{"title":"Rapid, graded sand preparation method using grain size distribution results for cement mortar testing","authors":"N. Prongmanee, Amorndech Noulmanee, Thawatchai Suppaso","doi":"10.1139/cjce-2023-0456","DOIUrl":"https://doi.org/10.1139/cjce-2023-0456","url":null,"abstract":"Adhering to ASTM C109/C109M-20 standards ensures quality in cement mortar specimens. However, achieving the required sand gradation per ASTM C778-21 can be challenging. This paper presents a faster method for adjusting sand gradation without compromising ASTM quality standards. The proposed method involves analyzing six silica sand samples of different gradations, pre-screening sands, using Excel Solver for optimal mixture ratios, making automated gradation tweaks with precise calculations, and validating the gradation to ensure ASTM compliance. After making the adjustments, compressive strength tests were conducted on mortars with the modified sands, and the results were compared with those of standard-graded sand. Based on statistical analysis, the new method yielded reliable outcomes with compressive strengths similar to standard sands. This innovation offers a more efficient alternative, paving the way for streamlined practices in civil engineering.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140725825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, evolutionary game method, prospect theory, and system dynamics (SD) method are combined to analyze the key stakeholders’ behaviors in the public-private partnership (PPP) project of not-in-my-back-yard (NIMBY) facility. First, the interaction behavior of the public sector, the private sector, and the public and their equilibrium state was analyzed based on the evolutionary game method and prospect theory. Then, the SD method was used to simulate and analyze the impact of different variables on the behavior of the three stakeholders. The results show that the greater the perceived cost difference between the active and negative behavior among the three stakeholders, the more likely they are to take negative behavior. The private sector tends to act opportunistically under low-risk loss situations. Dynamic rewards are more likely to incentivize the public to supervise than high rewards. Some recommendations to promote active behavioral interactions and cooperation among stakeholders were presented accordingly.
{"title":"The Behavioral Strategies of Multiple Stakeholders in the NIMBY Facility Public-Private Partnership Project: A Tripartite Evolutionary Game Analysis Based on Prospect Theory","authors":"Xiaotong Cheng, Min Cheng, Yaqun Liu","doi":"10.1139/cjce-2023-0437","DOIUrl":"https://doi.org/10.1139/cjce-2023-0437","url":null,"abstract":"In this study, evolutionary game method, prospect theory, and system dynamics (SD) method are combined to analyze the key stakeholders’ behaviors in the public-private partnership (PPP) project of not-in-my-back-yard (NIMBY) facility. First, the interaction behavior of the public sector, the private sector, and the public and their equilibrium state was analyzed based on the evolutionary game method and prospect theory. Then, the SD method was used to simulate and analyze the impact of different variables on the behavior of the three stakeholders. The results show that the greater the perceived cost difference between the active and negative behavior among the three stakeholders, the more likely they are to take negative behavior. The private sector tends to act opportunistically under low-risk loss situations. Dynamic rewards are more likely to incentivize the public to supervise than high rewards. Some recommendations to promote active behavioral interactions and cooperation among stakeholders were presented accordingly.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140747287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents a finite element (FE) analysis based study on the behavior of preloaded steel I-beams reinforced with cover plates welded to the bottom flanges of I-beams considering welding procedure simulation. FE analysis is conducted to study the effects of welding heat, welding sequence and weld length on the behavior of steel I-beams reinforced while under load. It is observed that an appropriate welding sequence and weld length can reduce the residual lateral deformations induced from welding. Based on the analyses, a welding segment of L/9, where L is the length of the beam, is recommended for practical applications. Also, initial geometrical imperfection is found to affect the value and direction of the residual deformation resulting from welding. Furthermore, preloading does not have any significant effect on the behavior of the I-beam reinforced at a preload level up to 50% of the strength of the unreinforced beam.
本文基于有限元（FE）分析，研究了在工字钢底部翼缘上焊接盖板的预载钢工字钢的行为，并考虑了焊接程序模拟。通过 FE 分析，研究了焊接热量、焊接顺序和焊接长度对加固钢工字钢在受载时的行为的影响。结果表明，适当的焊接顺序和焊接长度可以减少焊接引起的残余横向变形。根据分析结果，建议在实际应用中采用 L/9 的焊接段，其中 L 为梁的长度。同时还发现，初始几何缺陷会影响焊接产生的残余变形的值和方向。此外，在预载水平达到未加固梁强度的 50%时，预载对加固工字钢的行为没有明显影响。
{"title":"Reinforcing preloaded steel I-beams by considering welding heat effects and geometric imperfections","authors":"Masoud Mohammadzadeh, A. Bhowmick","doi":"10.1139/cjce-2022-0454","DOIUrl":"https://doi.org/10.1139/cjce-2022-0454","url":null,"abstract":"This paper presents a finite element (FE) analysis based study on the behavior of preloaded steel I-beams reinforced with cover plates welded to the bottom flanges of I-beams considering welding procedure simulation. FE analysis is conducted to study the effects of welding heat, welding sequence and weld length on the behavior of steel I-beams reinforced while under load. It is observed that an appropriate welding sequence and weld length can reduce the residual lateral deformations induced from welding. Based on the analyses, a welding segment of L/9, where L is the length of the beam, is recommended for practical applications. Also, initial geometrical imperfection is found to affect the value and direction of the residual deformation resulting from welding. Furthermore, preloading does not have any significant effect on the behavior of the I-beam reinforced at a preload level up to 50% of the strength of the unreinforced beam.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140754681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kai Shi, Tiegang Zheng, Shuangke Sun, Chengyi Tu, Huichao Dai, Xiaoming Yan, Jin Jin, Rongpan Zhou, Zhongyu Huang
A diversion pile was introduced into the resting pool of the vertical solt fishway while altered its installation position. A three-dimensional RNG k-ε turbulent mathematical model was then employed to analyze how the diversion pile with distinct positions affects the hydraulic characteristics in the resting pool under different slope conditions. The results show that with the diversion pile at the two-thirds position of the partion wall’s sidewall in the resting pool, the mainstream is effectively regulated to the central position, accompanied by a small degree of meandering. Under such an arrangement, although the diversion pile has an impact on the TKE in the resting pool across various slop conditions, the influence is insignificant. Therefore, it is recommended to install the diversion pile at the two-thirds position of the partition wall’s sidewall in the resting pool.
{"title":"Numerical Analysis of Hydraulic characteristics of resting pool in improved vertical slot fishway","authors":"Kai Shi, Tiegang Zheng, Shuangke Sun, Chengyi Tu, Huichao Dai, Xiaoming Yan, Jin Jin, Rongpan Zhou, Zhongyu Huang","doi":"10.1139/cjce-2023-0429","DOIUrl":"https://doi.org/10.1139/cjce-2023-0429","url":null,"abstract":"A diversion pile was introduced into the resting pool of the vertical solt fishway while altered its installation position. A three-dimensional RNG k-ε turbulent mathematical model was then employed to analyze how the diversion pile with distinct positions affects the hydraulic characteristics in the resting pool under different slope conditions. The results show that with the diversion pile at the two-thirds position of the partion wall’s sidewall in the resting pool, the mainstream is effectively regulated to the central position, accompanied by a small degree of meandering. Under such an arrangement, although the diversion pile has an impact on the TKE in the resting pool across various slop conditions, the influence is insignificant. Therefore, it is recommended to install the diversion pile at the two-thirds position of the partition wall’s sidewall in the resting pool.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140219110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Adham Badran, Ahmed A Elgeneidy, Luis Miranda-Moreno
Developing accurate large scale transportation models, used to guide policy adoption and evaluate infrastructure alternatives or changes in sociodemographic conditions, is data and resource intensive. This research proposes a new method to model intersection movement delay using crowd sensed Global Positioning System (GPS) data. This is done by providing a general definition of turning movements and extracting travel times from GPS trajectory data analysis. A simple method is also proposed to integrate the observed delays per movement type into volume-delay functions. The spatial definition provided for turning movements captured the different speed profiles per turn type. The significant difference in mean speeds for different turn types demonstrated the importance to integrate turn penalty functions based on real observations and the importance of crowd-sensed GPS data. A simple technique is also proposed to integrate the proposed method into the volume-delay functions used in large scale transport models.
{"title":"Intersection Movements Delay Modelling Based on Crowd-sensed Global Positioning System Trajectory Data","authors":"Adham Badran, Ahmed A Elgeneidy, Luis Miranda-Moreno","doi":"10.1139/cjce-2023-0313","DOIUrl":"https://doi.org/10.1139/cjce-2023-0313","url":null,"abstract":"Developing accurate large scale transportation models, used to guide policy adoption and evaluate infrastructure alternatives or changes in sociodemographic conditions, is data and resource intensive. This research proposes a new method to model intersection movement delay using crowd sensed Global Positioning System (GPS) data. This is done by providing a general definition of turning movements and extracting travel times from GPS trajectory data analysis. A simple method is also proposed to integrate the observed delays per movement type into volume-delay functions. The spatial definition provided for turning movements captured the different speed profiles per turn type. The significant difference in mean speeds for different turn types demonstrated the importance to integrate turn penalty functions based on real observations and the importance of crowd-sensed GPS data. A simple technique is also proposed to integrate the proposed method into the volume-delay functions used in large scale transport models.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140221051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This research comprehensively explored the function of preheating temperature and quantified the contribution of degree of blending (DoB) to performance of recycled HMAs. Five groups were designed, including no blending group, full blending group, and three experimental groups at preheating temperatures of 60 ºC, 110 ºC, and 160 ºC. It can be found that the preheating temperature played a positive impact on DoB and performance of recycled HMAs. As the preheating temperature increased by 50 ºC, about 0.13%~0.2% RAP binder can be additionally activated, and TSR, shear strength, and fracture energy of recycled HMAs can improve by around 6%~8%, 0.07 MPa~0.15 MPa, and 304.2 J•m2~335.4 J•m2, respectively. Moreover, the results showed that the performance of recycled mixes designed at preheating temperature of 60 ºC closed to that of no blending group, while the mixes designed at preheating temperature of 160 ºC can reach to that of full blending group.
{"title":"Evaluation of degree of blending and its effect to performance of recycled hot-mix asphalt under different preheating conditions","authors":"Yining Zhang, Hengjin Chen","doi":"10.1139/cjce-2023-0389","DOIUrl":"https://doi.org/10.1139/cjce-2023-0389","url":null,"abstract":"This research comprehensively explored the function of preheating temperature and quantified the contribution of degree of blending (DoB) to performance of recycled HMAs. Five groups were designed, including no blending group, full blending group, and three experimental groups at preheating temperatures of 60 ºC, 110 ºC, and 160 ºC. It can be found that the preheating temperature played a positive impact on DoB and performance of recycled HMAs. As the preheating temperature increased by 50 ºC, about 0.13%~0.2% RAP binder can be additionally activated, and TSR, shear strength, and fracture energy of recycled HMAs can improve by around 6%~8%, 0.07 MPa~0.15 MPa, and 304.2 J•m2~335.4 J•m2, respectively. Moreover, the results showed that the performance of recycled mixes designed at preheating temperature of 60 ºC closed to that of no blending group, while the mixes designed at preheating temperature of 160 ºC can reach to that of full blending group.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140229129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present study investigated a square-shaped group pier with attack angles of 0°, 10°, 15°, 20°, and 30° and spacing of 2, 3, and 4 times the pier width and a single pier with the same attack angles in the same experimental conditions. Also, a semi-empirical equation was presented for predicting the maximum depth of scour for single pier and group pier, which had good agreement with experimental results. Results indicated that by considering the angle of the single square pier, the flow impact area on the pier was altered, and the maximum depth of scour was reduced due to deformation resulting from the attack angle of the pier. In the tests related to the group pier, the attack angle of 15° was known as the critical attack angle in this study, which agreed with the results of previous studies.
{"title":"Experimental and theoretical study of sediment scour around angled bridge piers","authors":"Kamyab Habibi, Farinaz Erfani Fard, Seyed Amin Asghari Pari, Mahmood Shafai-Bajestan","doi":"10.1139/cjce-2023-0277","DOIUrl":"https://doi.org/10.1139/cjce-2023-0277","url":null,"abstract":"The present study investigated a square-shaped group pier with attack angles of 0°, 10°, 15°, 20°, and 30° and spacing of 2, 3, and 4 times the pier width and a single pier with the same attack angles in the same experimental conditions. Also, a semi-empirical equation was presented for predicting the maximum depth of scour for single pier and group pier, which had good agreement with experimental results. Results indicated that by considering the angle of the single square pier, the flow impact area on the pier was altered, and the maximum depth of scour was reduced due to deformation resulting from the attack angle of the pier. In the tests related to the group pier, the attack angle of 15° was known as the critical attack angle in this study, which agreed with the results of previous studies.","PeriodicalId":9414,"journal":{"name":"Canadian Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140077595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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