KSCE Journal of Civil Engineering最新文献_第8页

Computational Wind Analysis of a Closed Air-Inflated Membrane 封闭式充气膜的计算风力分析

IF 2.2 4区工程技术

KSCE Journal of Civil Engineering Pub Date : 2024-08-05 DOI: 10.1007/s12205-024-1505-6

Sherly Pool-Blanco, Krisztián Hincz

{"title":"Computational Wind Analysis of a Closed Air-Inflated Membrane","authors":"Sherly Pool-Blanco, Krisztián Hincz","doi":"10.1007/s12205-024-1505-6","DOIUrl":"https://doi.org/10.1007/s12205-024-1505-6","url":null,"abstract":"Membrane structures are becoming increasingly popular as a solution for covering large spans. Their versatility and short construction time make them an economical solution for temporary or permanent structures. During the structural analysis, the wind effects must be highly considered; however, because of their unique architectural shape, the pressure coefficients are not provided in the design codes. The current paper introduces the wind analysis of an air-inflated membrane structure. The pressure distribution on the external surface of the structure was determined for different wind directions by Computational Fluid Dynamics. The research included mesh sensitivity analysis and the evaluation of different turbulence models. Previous wind tunnel test results validated the numerical simulations. The experimentally and numerically determined pressure coefficient fields and the resulting respective membrane forces and displacements are compared. The presented results show that the CWE analysis can provide a suitable approximation of the WT-based results from a structural point of view. After validation, the numerical model was extended to similar structures with various lengths. The presented results can be used directly in the structural analysis of similarly shaped inflated membranes.","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141938947","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}

引用次数: 0

Effect of Fatigue Loading and Precracking on the Interface Shear Transfer of Cold Joints 疲劳加载和预裂对冷接缝界面剪力传递的影响

IF 2.2 4区工程技术

KSCE Journal of Civil Engineering Pub Date : 2024-08-05 DOI: 10.1007/s12205-024-1455-z

Jie Liu, Anning Wan, Xuyong Chen, Hehui Zheng, Xiangyu Huang, Qiaoyun Wu

{"title":"Effect of Fatigue Loading and Precracking on the Interface Shear Transfer of Cold Joints","authors":"Jie Liu, Anning Wan, Xuyong Chen, Hehui Zheng, Xiangyu Huang, Qiaoyun Wu","doi":"10.1007/s12205-024-1455-z","DOIUrl":"https://doi.org/10.1007/s12205-024-1455-z","url":null,"abstract":"This paper investigated the shear strengths (that is, the ultimate strength, post-ultimate residual strength and failure strength) and shear transfer mechanism of cold joints after experiencing high-cycle fatigue loading and/or precracking. Twelve cold joint push-off specimens with naturally smooth interfaces were cast and tested. Six of these specimens were directly subjected to push-off tests without any prior treatment, serving as control specimens. Two specimens were intentionally precracked, while the remaining four specimens underwent two million constant amplitude load cycles, before the push-off test. Push-off test results indicate that the effect of fatigue loading on shear strengths can be disregarded. Precracking has very little influence upon the residual strength and the failure strength, but it significantly reduces the ultimate strength to a level comparable to the residual strength. Moreover, this paper identified a new interface failure mode and presented complete interface shear load-displacement curves, revealing the shear transfer mechanism at the interface. This mechanism provides a clear explanation for the aforementioned effect on the shear strengths. Besides, building upon this mechanism and through a force-balance analysis, the equations are proposed for predicting the residual strength and failure strength of cold joints, which are found to reliably yield accurate calculation results.","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141939006","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}

引用次数: 0

Analytical Models for Shear-bearing Capacity of Hollow Core Beams Strengthened with HPC and Shear Steel Rebars 使用 HPC 和抗剪钢筋加固的空心梁抗剪承载力分析模型

IF 2.2 4区工程技术

KSCE Journal of Civil Engineering Pub Date : 2024-08-03 DOI: 10.1007/s12205-024-2442-0

Wenping Du, Guanjun Zhang, Caiqian Yang, Kai Ming, Peng Hou, Zheheng Chen, Zhihong Pan, Yaqiang Yang, Hans De Backer, Yong Pan

{"title":"Analytical Models for Shear-bearing Capacity of Hollow Core Beams Strengthened with HPC and Shear Steel Rebars","authors":"Wenping Du, Guanjun Zhang, Caiqian Yang, Kai Ming, Peng Hou, Zheheng Chen, Zhihong Pan, Yaqiang Yang, Hans De Backer, Yong Pan","doi":"10.1007/s12205-024-2442-0","DOIUrl":"https://doi.org/10.1007/s12205-024-2442-0","url":null,"abstract":"Facing the insufficient shear-bearing capacity of Hollow Core Beam (HCB), the High-performance Concrete (HPC) and shear steel rebars were proposed by the authors. However, investigations of the maximum diagonal crack width of the strengthened HCB specimens were scarce. Simultaneously, there were no details for the shear failure mechanism of the complex interface between HCB and HPC. For this reason, the failure modes and stirrup stress were first investigated. A simple model of maximum diagonal crack width of the strengthened HCB specimens was suggested. The maximum deviation of predictive value and test result was within 3%. Secondly, a modified truss-arch model of strengthened HCB specimen was proposed, considering the tensile behavior of the HPC. The average ratio of estimated and experimental results was 1.02. Finally, the shear-bearing capacity of strengthened HCB specimens was suggested considering the shear contribution of the HPC, shear steel rebars and interface bonding force. Compared with the previous shear test results reported by the authors, the maximum deviation was within 1%. To validate the accuracy of the formula, the other HCB specimen was used to evaluate the maximum deviation within 5%. It can be concluded that the proposed formula agrees well with the test results.","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882118","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}

引用次数: 0

Heat-water-stress Coupling Model for Saturated Frozen Soil under Different Stress Levels 不同应力水平下饱和冻土的热-水-应力耦合模型

IF 2.2 4区工程技术

KSCE Journal of Civil Engineering Pub Date : 2024-08-03 DOI: 10.1007/s12205-024-1698-8

Zhiming Li, Rui Jiang, Aiping Tang, Rui Zhu

{"title":"Heat-water-stress Coupling Model for Saturated Frozen Soil under Different Stress Levels","authors":"Zhiming Li, Rui Jiang, Aiping Tang, Rui Zhu","doi":"10.1007/s12205-024-1698-8","DOIUrl":"https://doi.org/10.1007/s12205-024-1698-8","url":null,"abstract":"Ground deformation induced by frost heave is a matter of concern in cold region engineering construction since it affects surrounding structures. Frost heave, which is related to the heat-water-stress interaction, is a complicated process. In this study, a heat-water-stress coupling model was established for saturated frozen soil under different stress levels to quantify the water redistribution, heat transfer, frost heave, and water intake. An empirical formula for the soil permeability considering the confining and deviator pressures was employed as an indispensable hydraulic equation in the coupling model. The Drucker-Prager yield criterion matched with the Mohr-Coulomb criterion was employed in the force equilibrium equation to investigate the deformation due to the deviator and confining pressures. The anisotropic frost heave during unidirectional freezing was further considered in the coupling model by introducing an anisotropic coefficient. Subsequently, based on the above coupling relationship, a mathematical module in COMSOL Multiphysics was applied to calculate the governing equation numerically. Finally, the proposed model was validated through an existing frost heave experiment conducted under various temperature gradients and stress levels. The results of the freezing front, water redistribution, water intake, and frost heave ratio predicted using the proposed model were found to be consistent with the experimental results.","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882114","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}

引用次数: 0

Analytical Method for the Buried Pipeline on an Elastic Foundation with Local Ground Subsidence 局部地面沉降弹性地基上埋设管道的分析方法

IF 2.2 4区工程技术

KSCE Journal of Civil Engineering Pub Date : 2024-08-03 DOI: 10.1007/s12205-024-1462-0

Fu-chen Guo, Yan-ping Lv, Fu-quan Chen, Dao-liang Lai

{"title":"Analytical Method for the Buried Pipeline on an Elastic Foundation with Local Ground Subsidence","authors":"Fu-chen Guo, Yan-ping Lv, Fu-quan Chen, Dao-liang Lai","doi":"10.1007/s12205-024-1462-0","DOIUrl":"https://doi.org/10.1007/s12205-024-1462-0","url":null,"abstract":"This study addresses the issue of localized ground subsidence and its effect on buried pipelines. Timoshenko beam model, placed on a Pasternak foundation, is used to analyze the internal force response of buried pipelines under foundation subsidence. The load on the pipeline, resulting from localized ground subsidence, is assumed to be symmetric. The load distribution on the buried section of the pipeline is represented using a McLaurin series. Analytical solutions for the deflection and bending moment of the pipeline under arbitrary symmetrical loading are derived based on the theory of elastic foundation beams. Additionally, the accuracy of the analytical solutions is verified through comparisons with experimental studies, finite element analysis, and existing theories. In the analysis, the shear modulus of the Timoshenko beam is set to infinity, resulting in the degeneration of the model into the Euler-Bernoulli beam. The effect of the shear modulus and diameter-span ratio (D/l) of the Timoshenko beam is investigated in the parameter analysis, and the applicability for both beam models is determined. The results indicate that, for buried pipelines with a diameter-span ratio greater than 0.1, the Timoshenko beam model provides more accurate deflection calculations than the Euler-Bernoulli beam model.","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882116","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}

引用次数: 0

Outsourcing Practices: Subconsultant Tipping Points Identified 外包实践：确定分包商临界点

IF 2.2 4区工程技术

KSCE Journal of Civil Engineering Pub Date : 2024-08-03 DOI: 10.1007/s12205-024-2133-x

Shih-Hsu Wang

{"title":"Outsourcing Practices: Subconsultant Tipping Points Identified","authors":"Shih-Hsu Wang","doi":"10.1007/s12205-024-2133-x","DOIUrl":"https://doi.org/10.1007/s12205-024-2133-x","url":null,"abstract":"Poor procurement and management practices can negatively affect subconsultant bidding interest and contract performance. Subconsultants tolerate these practices until a tipping point is reached, at which point their willingness to bid decreases and their contract performance declines. In this study, personnel from four engineering consultant firms and seven subconsultants in Taiwan were interviewed to investigate the effects of their outsourcing and procurement practices on the bidding interest of subconsultants. Outsourcing records spanning 3 years were retrieved from an engineering consultant firm and used to identify the aforementioned tipping points. The findings suggest that inviting many subconsultants to bid lowers their response rate and contract performance, without reducing the contract award price. In addition, when the maximum award price falls below the minimum price acceptable to subconsultants, resulting in the inability to achieve a one-time bidding scenario, even if the engineering consultant firms subsequently increase the maximum award price and successfully contract, the subconsultants’ sentiment remains unrecoverable. Finally, a novel remainder analysis mechanism is proposed to reveal the reasons why some contracts are not awarded in the first round and evaluate whether the reasonableness of the maximum award price setting by engineering consultant firms.","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882117","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}

引用次数: 0

Mechanical Behavior of Composite Shell Lining Structures Based on Cohesion Models 基于内聚力模型的复合材料壳衬结构的力学行为

IF 2.2 4区工程技术

KSCE Journal of Civil Engineering Pub Date : 2024-08-03 DOI: 10.1007/s12205-024-0470-4

Xianda Feng, Yingrui Lu, Bin Lu, Chao Yuan, Shuchen Li

{"title":"Mechanical Behavior of Composite Shell Lining Structures Based on Cohesion Models","authors":"Xianda Feng, Yingrui Lu, Bin Lu, Chao Yuan, Shuchen Li","doi":"10.1007/s12205-024-0470-4","DOIUrl":"https://doi.org/10.1007/s12205-024-0470-4","url":null,"abstract":"With the development of tunnel construction, the number of composite-lined tunnels with spray membrane waterproofing is gradually increasing. To clarify the mechanical properties of composite shell lining (CSL) structures, mechanical parameters of interlayer waterproofing membrane materials were determined by conducting uniaxial tensile, interlayer bond tensile, and interlayer bond shear tests on waterproofing membrane materials with different water-cement ratios. The cohesion model is used to simulate the bonding characteristics between waterproofing membranes and concrete to develop numerical simulation calculation models of CSL and double shell lining (DSL) structures. The results of indoor tests and numerical simulations confirmed the feasibility of using a cohesion model to characterize the interlayer shear mechanical properties of the waterproofing membrane. Relative to the DSL, the stresses of the primary support of CSL and key cross-sections of the secondary lining are more similar owing to the synergistic force between the primary support and secondary lining caused by the bonding characteristics of the waterproofing membrane, resulting in the formation of a type of composite load-bearing structure, which improves the utilization rate of the primary support and reduces the thickness of the secondary lining. Therefore, the CSL structure based on spray membrane waterproofing has broad application prospects.","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882112","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}

引用次数: 0

A Crowd Load Model for Structural Vibration Evaluation of Building Cover in a Large-Span Railway Station 用于大跨度火车站建筑盖板结构振动评估的人群荷载模型

IF 2.2 4区工程技术

KSCE Journal of Civil Engineering Pub Date : 2024-08-03 DOI: 10.1007/s12205-024-2520-3

Huiqi Liang, Tianhao Huo, Wenbo Xie, Qiang Hong, Zhiqiang Zhang, Peizi Wei, Yijing Lu

{"title":"A Crowd Load Model for Structural Vibration Evaluation of Building Cover in a Large-Span Railway Station","authors":"Huiqi Liang, Tianhao Huo, Wenbo Xie, Qiang Hong, Zhiqiang Zhang, Peizi Wei, Yijing Lu","doi":"10.1007/s12205-024-2520-3","DOIUrl":"https://doi.org/10.1007/s12205-024-2520-3","url":null,"abstract":"With the application of large-span building covers in high-speed railway stations, the issue of structural vibration comfort induced by crowd walking has aroused the attention of researchers. The randomness of the crowd flow on large-span building covers, combined with the conventional method adopting the worst load case to evaluate the human-induced structural vibration, leads to larger response results and a significant deviation from the actual scenario. In this study, a novel crowd-load model considering the inherent dual randomness associated with the trajectory of the crowd and walking load is proposed. It is developed by integrating the social force model with a random single person walking load. In addition, a corresponding framework for structural vibration calculation is proposed as well. Three crowd-loading models are established, accounting for randomness, by combining with the finite element model of the thin plate structure. The vibration response of the floor slab under crowd excitation was assessed in the waiting hall of Xiong'an high-speed railway station. Numerical simulation calculations were performed, comparing the results for three different types of crowd load. The findings indicate a significant reduction in the vibration response of the large-span waiting hall when employing the load model incorporating the social force model. This serves as a correction to the overly conservative nature of the conventional load model.","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882120","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}

引用次数: 0

Theoretical and Experimental Validation for Calculating Permeation Diffusion Radius in Soil-Rock Mixtures 计算土壤-岩石混合物渗透扩散半径的理论与实验验证

IF 2.2 4区工程技术

KSCE Journal of Civil Engineering Pub Date : 2024-08-03 DOI: 10.1007/s12205-024-0009-8

Zuliang Zhong, Jiayong Li, Congying Bie

{"title":"Theoretical and Experimental Validation for Calculating Permeation Diffusion Radius in Soil-Rock Mixtures","authors":"Zuliang Zhong, Jiayong Li, Congying Bie","doi":"10.1007/s12205-024-0009-8","DOIUrl":"https://doi.org/10.1007/s12205-024-0009-8","url":null,"abstract":"Due to the considerable variation in the range of rock content of the soil—rock mixture, when grouting experiments were conducted according to the existing grouting theory, it was found that a large number of pores not entirely filled by the slurry existed in the concretions of the medium to high rock content backfill area. Therefore, the existing slurry permeation grouting diffusion equation was optimized by adding the filling factor (γ). Based on the Bingham fluid rheological equation and the Newtonian fluid rheological equation, the optimized calculation equations for Bingham fluid and Newtonian fluid permeation diffusion considering the filling factor (γ) were derived. Furthermore, the indoor grouting experiment data are compared and analyzed with the calculation results of the original formula and the optimized formula. The results show that when ignoring the unfilled pores, the original formula calculating the diffusion radius will be small; the calculation results of the optimized formula considering the filling factor (γ) are closer to the actual experiment results. Moreover, based on the calculation results of the optimized formula, the order of influencing factors of the permeation diffusion radius is rock content > void ratio > water—cement ratio > grouting pressure.","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882115","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}

引用次数: 0

Novel A + Q Method for Improving Conventional Lowest Bid Contractor Selection Based on Post-performance Records 基于履约后记录改进传统最低价承包商选择的新型 A + Q 方法

IF 2.2 4区工程技术

KSCE Journal of Civil Engineering Pub Date : 2024-07-30 DOI: 10.1007/s12205-024-0885-y

Wen-Der Yu, Zhi-Lei Wang, Hsien-Kuan Chang, Tao-Ming Cheng

引用次数: 0