ce/papers最新文献

{"title":"Impact resistance of foam concrete gradient composite panels","authors":"Xun Guo,&nbsp;Bin Xiang,&nbsp;Jiehang Zhou,&nbsp;Mingyu Yang,&nbsp;Jianzhong Lai","doi":"10.1002/cepa.3108","DOIUrl":"https://doi.org/10.1002/cepa.3108","url":null,"abstract":"<p>Foam concrete has the advantages of energy and shock absorption which can be used as an impact resistant material. This article designed a three-layer concrete gradient structure and analyzed the failure mechanism of the structure. Finally it investigated impact resistance of concrete without aggregate and foam concrete with lightweight aggregate. The results show that compared with normal concrete, foam concrete has excellent impact resistance. The final cracking energy of the composite panel increased by 10% and 4.4% at different heights, respectively. The impact resistance of foam concrete without aggregate was better than that of foam concrete with lightweight aggregate, and the final cracking energy increased by 148.3% and 132.6%. Combined with macro analysis, it is found that the higher the porosity of foam concrete benefited the impact resistance of foam concrete. Therefore, this three-layer concrete composite panel is a potential protective material for daily construction and even other special occasions.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"138-144"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on Tensile Properties of Q235B / Q345qE Dissimilar Steel T-joints","authors":"Jiangning Pei,&nbsp;Shuai Dong,&nbsp;Xinzhi Wang,&nbsp;Yongqian Wang,&nbsp;Shengbao Wang,&nbsp;Fulin Su","doi":"10.1002/cepa.3111","DOIUrl":"https://doi.org/10.1002/cepa.3111","url":null,"abstract":"<p>As a key component of steel structure bridges, the performance of welded joints directly affects the safety and reliability of the whole structure. Especially under complex load conditions, welded joints are easy to become the leading area of structural failure. Therefore, it is necessary to simulate the tensile fracture of welded joints, which is an important means to ensure the safety and reliability of the structure. The T-joint is more complex and representative than the butt joint in the manufacturing process. In this study, the finite element simulation of welding was carried out on the analysis model. Based on the stress field obtained by welding simulation, the tensile fracture simulation was carried out based on Johnson-Cook (J-C) damage criterion, and the tensile strength and fracture position of the joint were obtained. The results show that the residual stress generated by welding is mainly concentrated in the weld seam, and the residual stress of the weldment will be reduced to a certain extent after a long period of cooling. The tensile fracture results show that the stress of the weldment will be concentrated near the weld during the tensile process. The error between the simulated tensile strength of the T-joint and the test is only 1.54 %, and the fracture position of the analysis model is also basically consistent with the test results. The research provides a feasible basis for the application of dissimilar steel welding technology in the field of bridge engineering.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"160-171"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Discussion on Test Methods of Engineering Property for Friable Geomaterials","authors":"Chao Yang,&nbsp;Shu-guang Liu,&nbsp;Si-kai Bai","doi":"10.1002/cepa.3114","DOIUrl":"https://doi.org/10.1002/cepa.3114","url":null,"abstract":"<p>Conventional test method does not consider the distortion of the test result caused by the particles breakage of brittle geomaterials. In order to explore the test method of the engineering properties of brittle geomaterials, the gradation test, specific gravity test and relative density test of coral sands were carried out in view of the special properties of coral sands with internal pores and fragile, which may be caused by the internal pores and particle breakage. The results showed that the internal porosity and fragile nature of coral sands affected the reliability of the test results of engineering properties. The characteristic particle diameter of coral sands changes greatly due to particle fragmentation, which cause the changes of the permeability characteristics, compression characteristics, mechanical properties and other aspects of geomaterial characteristics of coral sands. Non-contact test methods such as digital image processing can effectively avoid particle breakage and can truly reflect the particle size of brittle materials. It is difficult for the liquid to penetrate into the inner pores of the particles only by submerging, and pure water as the test liquid will dissolve the salts on the surface of the particles, all of which will affect the accuracy of the test results. Kerosene as the test liquid can prevent the salt on the surface of the particles from dissolving; and the measured value is more consistent with the calculated value. There was little difference in the minimum dry density obtained by funnel method and the volumetric cylinder method. The minimum dry density measured by the volumetric cylinder method is slightly lower. So it is recommended to use the measuring cylinder method to test the minimum dry density of coral sands. The hammering will inevitably break up the coral sands particles, which will cause the results of the maximum dry density test to be severely distorted. The test results of pressurized vibration method are more reliable. It is recommended to use saturated coral sands and pressurized vibration method or surface vibration method to test the maximum dry density, which can effectively avoid the distortion of the results caused by particle breaking.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"201-212"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of hydraulic concrete surface quality by different controlled permeability formwork liner","authors":"Longzhen Ge,&nbsp;Yin Bai,&nbsp;Jianhui Tang,&nbsp;Wenxun Qian","doi":"10.1002/cepa.3116","DOIUrl":"https://doi.org/10.1002/cepa.3116","url":null,"abstract":"<p>To enhance the improvement effect of controlled permeability formwork liner (CPFL) on the surface quality of concrete, two kinds of modified CPFLs were prepared by adjusting the pore size and stiffness. The effects of modified CPFLs on the three-dimensional surface morphology of concrete, the surface rebound strength, and the pore structure at different depths were analyzed by using three-dimensional image scanning, the rebound method, and the image recognition technology. The results showed that after using modified CPFLs with smaller average pore size and higher stiffness, the surface roughness of concrete was reduced by 54%, the coefficient of variation for surface strength was controlled within 0.067∼0.074, the porosity was decreased by 17.9%∼22.9% and the improvement depth of the concrete was increased to 20 mm. Compared with ordinary CPFL, modified CPFLs had more advantages in reducing the surface roughness of concrete and improving the uniformity of surface strength distribution. Modified CPFLs can significantly reduce the number of pore, porosity and pore fractal dimension of the concrete surface, and the improvement depth of the concrete is greater compared to ordinary CPFL. Reducing pore size and increasing stiffness can effectively enhance the improvement effect of CPFL on the surface quality of concrete.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"224-230"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structured Light Device and Algorithmic Enhancements for Automated Bridge Steel Bar Weld Inspection","authors":"Yu Tang,&nbsp;Jianyu Zhuo,&nbsp;Guangwu Dou,&nbsp;Lu Peng,&nbsp;Hongfeng Sun,&nbsp;Xiaofan Feng","doi":"10.1002/cepa.3188","DOIUrl":"https://doi.org/10.1002/cepa.3188","url":null,"abstract":"<p>The structural integrity of steel bar welds is paramount for the operational efficiency of highway infrastructure. Traditional assessment techniques, primarily manual visual inspections and conventional measuring tools, are characterized by notable deficiencies in precision, reliability, and efficiency. Given the increasing demands for safety inspections within China's vast highway network, these traditional methods are insufficient to meet the contemporary requirements for rapid testing. To bridge this gap, this research introduces an innovative automated visual inspection system and associated technology specifically designed for steel bar welds. By leveraging the finite element method, the study simulates weld defects and develops sophisticated image preprocessing and enhancement algorithms, along with an improved version of the traditional Normalized Mean Square Error (NMSSE) algorithm. Experimental outcomes from both controlled laboratory environments and field validations demonstrate the effectiveness of the proposed methodologies in replacing traditional inspection techniques, providing rapid and accurate evaluations of weld quality. These advancements not only establish new technical benchmarks for the morphological assessment of infrastructure surfaces but also significantly enhance the maintenance and safety evaluations of aging bridge infrastructures, thereby contributing to the overall resilience and safety of highway systems.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"988-995"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of Flexural Toughness of ECC Components Reinforced with CFRP Designed for Link Slab","authors":"Lifei Zhang,&nbsp;Yu Zheng,&nbsp;Bo Di,&nbsp;Lipeng Xia,&nbsp;Ning Zhang","doi":"10.1002/cepa.3176","DOIUrl":"https://doi.org/10.1002/cepa.3176","url":null,"abstract":"<p>The innovative link slab employs Engineered Cementitious Composites (ECC) with Carbon Fibre Reinforced Polymer (CFRP) reinforcement, attracting increasing interest. To study the synergistic performance of CFRP reinforced ECC bridge link slab, a series of ECC flexural members were conducted by using ECC combined with CFRP reinforcing material, which is designed for bridge link slab. The test results were presented and discussed based on the strain distributions and deformation relationship. It can be conclude that flexural toughness and multiple cracking behaviour of CFPR reinforced ECC elements were enhanced due to the application of CFRP reinforcement. The test results also revealed that flexural capacity of the ECC flexural members reinforced with CFRP bars was the highest capacity in all the test specimens. Interestingly, the specimens reinforced with soft CFRP grids had a similar ultimate strength as the ECC specimens without reinforcement. In addition, the cover thickness of CFRP bars within a reasonable range resulted in positive effect on bending capacity and reduced rotation stiffness of flexural members. Based on the experimental analysis results, the flexural toughness of CFPR reinforced ECC elements were evaluated using the methods of flexural toughness factor (JSCE-SF4) and post crack strength method (PCSm), respectively. Flexural toughness expresses the flexural capacity and indicates the degree of ductility of CFPR reinforced ECC components without any sudden failure. It was found that the analysis method of JSCE could reflect the whole process of bending test and PCSm model reflected the flexural behaviour after the peak load accurately.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"861-880"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on cable damage identification of cable-stayed bridges based on combined Convolutional Neural Network and Long Short-Term Memory","authors":"Xueyang Huang,&nbsp;Geyi Xiang,&nbsp;Hanqing Yin,&nbsp;Sanfan Zhu,&nbsp;Zhanghua Xia,&nbsp;Canglin Lai","doi":"10.1002/cepa.3248","DOIUrl":"https://doi.org/10.1002/cepa.3248","url":null,"abstract":"<p>Cable-stayed bridges are one of the most popular bridge structures for mega bridge projects. In the safe operation of cable-stayed bridge, it is necessary to accurately evaluate the state of the bridge structure and improve the accuracy of cable damage identification. In this paper, the combined damage index of frequency and total energy change rate is taken as input vector. Convolutional Neural Network (CNN) has the advantage of high-dimensional feature extraction. Long Short Memory Network (LSTM) advantage in time series modeling ability. A combined CNN&amp;LSTM method was proposed to recognize the cable-stay damage of cable-stayed bridges. Then, damage identification was performed on the cable-stayed bridge model under single and two cable damage conditions. And varied damage conditions are selected to verify the accuracy of the combined CNN&amp;LSTM model. The results show that the damage location and damage degree of cable-stayed Bridges can be identified with high precision by using the combined CNN&amp;LSTM model.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1629-1641"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis on Reinforcement Effect of Tunnel Portal Longitudinally Traversing Landslide in Broken Rock Area","authors":"Hong-wei Ji,&nbsp;Yuanlang Dong,&nbsp;Wei Xu,&nbsp;Le Li","doi":"10.1002/cepa.3124","DOIUrl":"https://doi.org/10.1002/cepa.3124","url":null,"abstract":"<p>Influenced by the external environment and human factors, the tunnel portal landslide disaster is very easy to occur in the process of crossing the mountain. Taking the landslide at the entrance of Qingshashan left line tunnel as an example, this paper studies the deformation mechanism and reinforcement effect of landslide at the entrance by means of case statistical analysis, numerical simulation and field monitoring. It is shown that the landslide at the entrance of the tunnel belongs to the tunnel landslide parallel system, and the tunnel is below the sliding surface. The rock mass is disturbed, which results in the sliding deformation of the slope body after the excavation. Further, the tunnel structure appears crack because of the landslide thrust. The results indicate that construction disturbance and continuous rainfall are the main factors that may lead to slope sliding based on numerical analysis. The monitoring data show that the deformation and displacement rate of the landslide body is greatly reduced after the reinforcement measures', the stress state between the rock masses is constantly adjusted and gradually tends to a stable state, which basically achieves the expected treatment goal.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"290-305"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143646063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on the Uplift Bearing Capacity of the Rock-socketed Pile and Failure Mechanism","authors":"Yifan Fu,&nbsp;Lixin Yu,&nbsp;Shuguang Wu,&nbsp;Sen Li","doi":"10.1002/cepa.3130","DOIUrl":"https://doi.org/10.1002/cepa.3130","url":null,"abstract":"<p>The ultimate uplift bearing capacity calculation of rock-socketed piles in the current standard only applies to the shear failure, which takes place at the pile-rock interface. However, the inverted cone tensile failure at the top of the rock mass exists might occur under uplift load when the rock socketed depth is shallow. A calculation method for the uplift bearing capacity of rock socketed piles considering different failure modes has been proposed based on theoretical analysis. The proposed method considers both shear and tensile failure modes and is validated through model experiments. The inverted cone failure mode of rock socketed piles under uplift load is identified in the experiment. When the depth of the embedded rock pile is less than 2 times the pile diameter, the height of the inverted cone is basically the same as the embedded rock depth, implying that the rock mass begins to crack from the bottom of the pile. The overburden stress has an impact on the angle between the failure surface of the inverted cone and the horizontal plane. The angle between the failure plane and the horizontal plane for pile with covering soil layer is greater than that for pile without covering soil layer. The calculation method for the uplift bearing capacity of rock-socketed piles considering the tensile failure of the inverted cone provide analysis results close to those of the model test, and it can be used to calculate rock-socketed piles with small depth.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"369-384"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143646069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Water Hammer Safety Protection for Deep Well Pump Group in Plain Area","authors":"Gaohui Li,&nbsp;Mingjie He,&nbsp;Yuxin Gao,&nbsp;Luming Li,&nbsp;Aili Shen","doi":"10.1002/cepa.3151","DOIUrl":"https://doi.org/10.1002/cepa.3151","url":null,"abstract":"<p>The importance of water hammer protection cannot be ignored, and it is directly related to the safe and stable operation of the water supply system. Taking a city deep well pump group as an example, the pipeline pressure drop of the water supply system is calculated, and the pipeline pressure envelope is drawn for the water hammer protection review and analysis. According to the characteristics of the water supply pipeline, the protection scheme of the air valve and water hammer is formulated. By reasonably setting the air valve, complete the functions of water filling, inflation and exhaust, and eliminate the water hammer.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"620-629"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143646101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}