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Theoretical Analysis on Deflection and bearing capacity of Prestressed Bamboo-Steel Composite Beams

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Journal of Renewable Materials 2024年第1期12卷 149-166页

作者： Qifeng Shan Ming Mao Yushun Li School of Civil Engineering Zhejiang Industry Polytechnic CollegeShaoxing312000China School of Civil&Environmental Engineering and Geography Science Ningbo UniversityNingbo315211China College of Civil Engineering and Architecture Qingdao Agricultural UniversityQingdao266109China

A theoretical analysis of upward deflection and midspan deflection of prestressed bamboo-steel composite beams is presented in this *** deflection analysis considers the influences of interface slippage and shear ***,the calculation model for flexural capacity is proposed considering the two stages of *** theoretical results are verified with 8 specimens considering different prestressed load levels,load schemes,and prestress *** results indicate that the proposed theoretical analysis provides a feasible prediction of the deflection and bearing capacity of bamboo-steel composite *** deflection analysis,the method considering the slippage and shear deformation provides better *** theoretical method for bearing capacity matches well with the test results,and the relative errors in the serviceability limit state and ultimate limit state are 4.95%and 5.85%,respectively,which meet the accuracy requirements of the engineered application.

关键词： Bamboo scrimber composite beam prestress deflection bearing capacity

Analysis of the Application of Static Load Test in Bridge bearing capacity Testing

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Journal of Architectural Research and Development 2024年第3期8卷 36-41页

作者： Wei Fu Bo Liu China Merchants Chongqing Highway Engineering Testing Center CO. LTD.Chongqing 400060China

This article uses real engineering projects as examples to analyze how static load test technology is applied in testing the bridge-bearing *** analysis covers aspects such as testing section layout,test load and efficiency coefficient,loading plan,evaluation optimization,test result modification,and result *** aim is to support the accurate detection and evaluation of bridge-bearing capacity.

关键词： Bridge engineering bearing capacity Static load test Loading plan Test evaluation

Analysis of Bridge-bearing capacity Detection and Evaluation Technology

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Journal of World Architecture 2024年第2期8卷 129-133页

作者： Wei Fu Bo Liu China Merchants Chongqing Highway Engineering Testing Center CO. LTD.Chongqing 400060China

A bridge project is taken as an example to analyze the application of bearing capacity detection and *** article provides a basic overview of the project,the application of bearing capacity detection technology,and the bearing capacity assessment *** is hoped that this analysis can provide a scientific reference for the load-bearing capacity detection and evaluation work in bridge engineering projects,thereby achieving a scientific assessment of the overall load-bearing capacity of the bridge engineering structure.

关键词： Bridge engineering structure bearing capacity Calculation model Detection points Quantitative standards

Experimental study of the bearing capacity of a drainage pipe pile under vacuum consolidation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第8期23卷 639-651页

作者： Xiao-wu TANG Wei-kang LIN Yuan ZOU Jia-xin LIANG Wen-fang ZHAO Research Center of Coastal and Urban Geotechnical Engineering Department of Civil EngineeringZhejiang UniversityHangzhou 310058China Engineering Research Center of Urban Underground Space Development of Zhejiang Province Hangzhou 310058China

In this study,we propose a drainage pipe pile under vacuum consolidation to integrate foundation treatment and pile foundation engineering in soft soil *** study its bearing capacity characteristics and foundation treatment performance,single pile static load tests,vane shear tests,and water content tests were carried out for ordinary piles,perforated piles,and drainage pipe piles under conditions of static and vacuum *** on the results,the concept of strong and weak reinforcement areas was proposed and used for bearing capacity *** results showed that the drainage pipe pile did not become silted under vacuum *** single pile bearing capacity was much higher than that of an ordinary pile,and the pile side friction was exerted mainly in the middle and lower *** results were achieved using the shear strength at the junction of the strong and weak reinforcement areas to estimate the ultimate bearing capacity of a single *** study provided important insights into the design and construction of drainage pipe piles in a soft soil foundation.

关键词： Drainage pipe pile Soft soil Consolidation bearing capacity Foundation treatment

Soil effect on the bearing capacity of a double-lining structure under internal water pressure

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第11期23卷 863-881页

作者： Dong-mei ZHANG Xiang-hong BU Jian PANG Wen-ding ZHOU Yan JIANG Kai JIA Guang-hua YANG Department of Geotechnical Engineering Tongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground Engineering of Minister of Education Tongji UniversityShanghai 200092China State Grid Tianjin Electric Power Company Construction Branch Tianjin 300143China Guangdong Research Institute of Water Resources and Hydropower Guangzhou 510610China School of Water Conservancy Engineering Zhengzhou UniversityZhengzhou 450001China

Water conveyance tunnels usually experience high internal water pressures and complex soil ***,shield tunnels with double-lining structure have been adopted because of their high bearing *** effect of the interface between the segmental and inner linings on the bearing capacity has been widely investigated;however,the effect of soil on the internal water pressure bearing capacity has not been emphasized ***,in this study,model tests and an analytical solution are presented to elucidate the effect of soil on the internal water pressure bearing ***,model tests are conducted on double-lining models under sandy soil and highly weathered argillaceous siltstone *** internal force and earth pressure under these different soil conditions are then compared to reveal the contribution of soil to the internal water pressure bearing *** this,an analytical solution,considering the soil–double-lining interaction,is proposed to further investigate the contribution of the *** analytical solution is verified with model *** analytical solution is in good agreement with the model test results and can be used to evaluate the mechanical behavior of the double-lining and soil *** effect of soil on the bearing capacity is found to be related with the elastic modulus of the soil and the deformation state of the *** the double-lining cracks,the sandy soil contributes 3.7%of the internal water pressure but the contribution of the soil rises to 10.4%when it is the highly weathered argillaceous *** the double-lining cracks,the soil plays an important role in bearing internal water *** soil contributions of sandy soil and highly weathered argillaceous siltstones are 10.5%and 27.8%,*** effect of soil should be considered in tunnel design with the internal water pressure.

关键词： Shield tunnel Double-lining bearing capacity Soil condition Internal water pressure

Revisiting the analytical solutions for ultimate bearing capacity of pile embedded in rocks

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第6期15卷 1506-1519页

作者： A.Picardo M.A.Millán R.Galindo A.Alencar Escuela Técnica Superior de Arquitectura Universidad Politécnica de MadridMadrid28040Spain Escuela Técnica Superior de Ingenieros de Caminos Canales y Puertos de MadridUniversidad Politécnica de MadridMadrid28040Spain

This paper investigates the validity and shortcomings of the existing analytical solution for the ultimate bearing capacity of a pile embedded in a rock mass using the modified HoekeBrown failure *** this criterion is considered a reference value for empirical and numerical calculations,some limitations of its basic simplifications have not been clarified *** research compares the analytical results obtained from the novel discontinuity layout optimization(DLO)method and the numerical solutions from the finite difference method(FDM).The limitations of the analytical solution are considered by comparing different DLO failure modes,thus allowing for the first time a critical evaluation of its scope and conditioning for *** of up to 40%in the bearing capacity and unrealistic failure modes are the main issues in the analytical *** main aspects of the DLO method are also analyzed with an emphasis on the linearization of the rock failure criterion and the accuracy resulting from the discretization *** analysis demonstrates DLO as a very efficient and accurate tool to address the pile tip bearing capacity,presenting considerable advantages over other methods.

关键词： Discontinuity layout optimization(DLO) Analytical solution bearing capacity Deep foundations HoekeBrown failure criterion Finite difference method(FDM)

bearing capacity and load transfer mechanism of a static drill rooted nodular pile in soft soil areas

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第10期14卷 705-719页

作者： Jia-jin ZHOU Kui-hua WANG Xiao-nan GONG Ri-hong ZHANG Research Center of Coastal and Urban Geotechnical Engineering Zhejiang University ZDOON Building Material Group

The static drill rooted nodular pile is a new type of pile foundation consisting of precast nodular pile and the surrounding cemented *** composite pile has a relatively high bearing capacity and the mud pollution will be largely reduced during the construction process by using this type of *** order to investigate the bearing capacity and load transfer mechanism of this pile,a group of experiments were conducted to provide a comparison between this new pile and the bored *** axial force of a precast nodular pile was also measured by the strain gauges installed on the pile to analyze the distribution of the axial force of the nodular pile and the skin friction supported by the surrounding soil,then 3D models were built by using the ABAQUS finite element program to investigate the load transfer mechanism of this composite pile in *** combining the results of field tests and the finite element method,the outcome showed that the bearing capacity of a static drill rooted nodular pile is higher than the bored pile,and that this composite pile will form a double stress dispersion system which will not only confirm the strength of the pile,but also make the skin friction to be fully *** settlement of this composite pile is mainly controlled by the precast nodular pile;meanwhile,the nodular pile and the surrounding cemented soil can be considered as deformation compatibility during the loading *** nodes on the nodular pile play an important role during the load transfer process,the shear strength of the interface between the cemented soil and the soil of the static drill rooted pile is larger than that of the bored pile.

关键词： Static drill rooted nodular pile Load transfer bearing capacity ABAQUS Double stress dispersion system Three-dimensional modeling

bearing capacity of thin-walled shallow foundations： an experimental and artificial intelligence-based study

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2016年第4期17卷 273-285页

作者： Hossein REZAEI Ramli NAZIR Ehsan MOMENI Faculty of Engineering Lorestan University Khorram A bad 68151-44316 Iran Department of Geotechnics and Transportation Faculty of Civil Engineering Universiti Teknologi Malaysia Johor 81310 Malaysia

Thin-walled spread foundations are used in coastal projects where the soil strength is relatively low. Developing a predictive model of bearing capacity for this kind of foundation is of interest due to the fact that the famous bearing capacity equations are proposed for conventional footings. Many studies underlined the applicability of artificial neural networks （ANNs） in predicting the bearing capacity of foundations. However, the majority of these models are built using conventional ANNs, which suffer from slow rate of learning as well as getting trapped in local minima. Moreover, they are mainly developed for conventional footings. The prime objective of this study is to propose an improved ANN-based predictive model of bearing capacity for thin-walled shallow foundations. In this regard, a relatively large dataset comprising 145 recorded cases of related footing load tests was compiled from the literature. The dataset includes bearing capacity （Qu）, friction angle, unit weight of sand, footing width, and thin-wall length to footing width ratio （Lw/B）. Apart from Qu, other parameters were set as model inputs. To enhance the diversity of the data, four more related laboratory footing load tests were conducted on the Johor Bahru sand, and results were added to the dataset. Experimental findings suggest an almost 0.5 times increase in the bearing capacity in loose and dense sands when LJB is increased from 0.5 to 1.12. Overall, findings show the feasibility of the ANN-based predictive model improved with particle swarm optimization （PSO）. The correlation coefficient was 0.98 for testing data, suggesting that the model serves as a reliable tool in predicting the bearing capacity.

关键词： Thin-walled foundation Sand bearing capacity Artificial neural network (ANN) Particle swarm optimization (PSO)

bearing capacity and settlement of strip footing on geosynthetic reinforced clayey slopes

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Journal of Central South University 2012年第4期19卷 1116-1124页

作者： S.A.Naeini B.Khadem Rabe E.Mahmoodi Department of Civil Engineering Imam Khomeini International UniversityQazvin 16818-34149Iran

The effect of geosynthetic reinforcing on bearing capacity of a strip footing resting on georeinforced clayey slopes was *** results of a series of numerical study using finite element analyses on strip footing upon both reinforced and unreinforced clayey slopes were *** objectives of this work are to:1) determine the influence of reinforcement on the bearing-capacity of the strip footings adjacent slopes,2) suggest an optimum number of reinforcement and 3) survey the effect of friction angle in clayey soils reinforced by *** investigations were carried out by varying the edge distance of the footing from *** different numbers of geosynthetic layers were applied to obtaining the maximum bearing capacity and minimum *** achieve the third objective,two different friction angles were *** results show that the load?settlement behavior and ultimate bearing capacity of footing can be considerably improved by the inclusion of reinforcing *** using more than one layer reinforcement,the ultimate bearing capacity does not change *** is also shown that for both reinforced and unreinforced slopes,the bearing capacity increases with an increase in edge *** addition,as the soil friction angle is increased,the efficiency of reinforcing reduces.

关键词： geosynthetic reinforcing numerical analysis bearing capacity strip footing clayey slope friction angle