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bearing behavior of Cast-in-Place Expansive Concrete Pile in Coral Sand Under Vertical Loading

China Ocean Engineering 2021年第3期35卷 352-360页

作者： DING Xuan-ming DENG Wei-ting PENG Yu ZHOU Hang WANG Chun-yan Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Department Chongqing UniversityChongqing 400045China College of Civil Engineering Chongqing UniversityChongqing 400045China

The low side friction of piles in coral sand results in the low bearing capacity of *** this paper,expansive concrete pile is utilized to improve the bearing capacity of pile foundations in coral *** model tests and numerical simulation are performed to reveal the bearing mechanism of expansive concrete pile in coral *** showed that the lateral earth pressure near pile increases obviously and the side friction of piles is improved,after adding expansion agent to the *** horizontal linear expansion is 1.11%and the bearing capacity increased 41%for the pile,when 25%expansion agent is *** in finite element numerical simulation also show that ultimate bearing capacity increases with the increase of the linear expansion ***,the area for obvious increase in side friction is below the surface of soil about three times the pile diameter,and the expansion leads to a high side friction sharing of the ***,the cast-in-place expansive concrete pile is effective in improving the bearing capacity of piles in coral sand.

关键词： bearing behavior expansive concrete pile coral sand side friction numerical simulation

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bearing behavior and failure mechanism of squeezed branch piles

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 935-946页

作者： Minxia Zhang Ping Xu Wenjie Cui Youbin Gao School of Civil Engineering Henan Polytechnic University School of Water Conservancy and Environmental Engineering Zhengzhou University

The current practice for the design of squeezed branch piles is mainly based on the calculated bearing capacity of circular piles. Insufficient considerations of the load-transfer mechanism, branch effect and failure mechanism, as well as overreliance on pile load tests, have led to conservative designs and limited application. This study performs full-scale field load tests on instrumented squeezed branch piles and shows that the shaft force curves have obvious drop steps at the branch position, indicating that the branches can effectively share the pile top load. The effects of branch position, spacing, number and diameter on the pile bearing capacity are analyzed numerically. The numerical results indicate that the squeezed branch piles have two types of failure mechanisms, i.e. individual branch failure mechanism and cylindrical failure mechanism. Further research should focus on the development of the calculation method to determine the bearing capacities of squeezed branch piles considering these two failure mechanisms.

关键词： Squeezed branch piles Field test bearing behavior Failure mechanism Numerical simulation

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Influence of bolt dynamic installation on topography characteristics and mechanical behaviors of CFRP interference-fit bolted joints

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Chinese Journal of Aeronautics 2024年第2期37卷 482-500页

作者： Xiaohe WANG Zengqiang CAO Yuehaoxuan WANG Yingjiang GUO School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China NPU Xuhang Electromagnetic Technology Co. Ltd.Xi’an 710100China

As the controlled research of Dynamic Installation(DI)and Static Installation(SI),a new interference installation method was developed based on electromagnetic loading to enhance the mechanical properties of composite *** different interference-fit sizes were considered,ranging from a net fit to 2.0%.The experiments were conducted to evaluate the installation resistance and the mechanical behavior of the joint under external ***,an FFA model to model the stress distribution and damage behavior of the bolt-hole contact interface was *** load-displacement curve and damage modes of experiments were used to verify the FEA *** results show that the installation resistance during DI process was remarkably lower than that of SI process corresponding to all interference-fit sizes,and the stress amplitudes induced by interference were larger and widely *** damage of the hole wall was positively correlated with interference fit size,but DI can significantly reduce the damage compared to *** performance tests,DI enhanced the static bearing capacity and extended longer fatigue life of the joints than *** methods can be an effective way to achieve highly reliable interference joints in composite structures.

关键词： Carbon Fiber-Reinforced Polymer(CFRP) Bolted joints Interference-fit Electromagnetic installation Finite Element Analysis(FEA) Damage mechanics bearing behavior

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State-of-the-art on resistance of bearing-type bolted connections in high strength steel

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Frontiers of Structural and Civil Engineering 2020年第3期14卷 569-585页

作者： Guoqiang LI Yifan LYU Yanbo WANG State Key Laboratory for Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China College of Civil Engineering Tongji UniversityShanghai 200092China

With the recent development of material science,high strength steel(HSS)has become a practical solution for landmark buildings and major *** current codes for design of bearing-type bolted connections of steel constructions were established based on the research of conventional *** the mechanical properties of HSS are different from those of conventional steels,more works should be done to develop the appropriate approach for the design of bearing-type bolted connections in HSS.A review of the research carried out on bearing-type bolted connections fabricated from conventional steel and HSS is *** up-to-date tests conducted at Tongji University on four connection types fabricated from three grades of HSS with nominal yield strengths of 550,690,and 890 MPa are *** previous research on failure modes,bearing resistance and the design with consideration of bolt hole elongation are *** is found that the behavior of bolted connections in HSS have no drastic difference compared to that of conventional steel *** the ductility is reduced,plastic deformation capacity of HSS is sufficient to ensure the load redistribution between different bolts with normal construction *** is also found that behavior of each bolt of multi-bolt connections arranged in perpendicular to load direction is almost identical to that of a single-bolt connection with the same end *** connections with bolts arranged in parallel to load direction,the deformation capacity of the whole connection depends on the minimum value between the end distance and the spacing distances in load *** comparison with existing design codes shows that Eurocode3 and Chinese GB50017-2017 are conservative for the design of bolted connections in HSS while AISC 360-16 may overestimate the bearing resistance of bolted connections.

关键词： High strength steel bolted connection bearing behavior design codes

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Field testing of geosynthetic-reinforced and column-supported earth platforms constructed on soft soil

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Frontiers of Structural and Civil Engineering 2014年第2期8卷 124-139页

作者： Qiangong CHENG Jiujiang WU Dongxue ZHANG Fengping MA Department of Geological Engineering Southwest Jiaotong University Chengdu 610031 China

This paper is focused on the behavior of geosynthetic-reinforced and column-supported （GRCS） earth platforms in soft soil. By analyzing the data of a 15-month long field monitoring project, the bearing behavior and effectiveness of GRCS earth platforms are discussed in detail. It can be found that the soil arching is generated when the filling reaches a certain height. The measured pressure acting on the soil in the center of four piles was smaller than that acting on the soil between two piles. The elongation and the tension of the geogrid located in the soil between piles are both larger than the corresponding values on the pile top. The skin friction of piles is relatively small in the soil layer with low strength and the load transfer of the axial force in those layers is significant; meanwhile, the opposite situation occurs in the soil layer with high strength. The pore water pressure at shallow locations increases slightly with the filling height and is greatly affected by the increasing filling load. The layered settlement is directly proportional to the filling height, and the corresponding amount is relevant to the locations and the properties of specific soil layers. Additionally, the lateral displacement of the embankment increases with greater loading and decreases with increased depth. These suggest that the use of GRCS system can reduce lateral displacements and enhance the stability of an embankment significantly.

关键词： geosynthetic-reinforced and column-supported (GRCS) earth platforms soft soil bearing behavior settlementand deformation field testing

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The behavior of a rectangular closed diaphragm wall when used as a bridge foundation

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Frontiers of Structural and Civil Engineering 2012年第4期6卷 398-420页

作者： Qiangong CHENG Jiujiang WU Zhang SONG Hua WEN Department of Geological Engineering Southwest Jiaotong UniversityChengdu 610031China

The rectangular closed diaphragm(RCD)wall is a new type of bridge *** to barrette foundation,measuring the performance of RCD walls is relatively complicated because of their incorporation of a soil *** the FLAC3D software,this paper investigates the deformation properties,soil resistance and skin friction of a laterally loaded RCD wall as well as the settlement,axial force and load-sharing ratio of a vertically loaded RCD *** attention is given to the analysis of factors that influence the performance of the soil *** was found that under lateral loading,the RCD wall behaves as an end-bearing friction wall during the entire loading *** relative displacement between the wall body and the soil core primarily occurs below the rotation point,and the horizontal displacement of the soil core is greater than that of the wall *** vertical loading,the degree of inner skin friction around the bottom of the soil core and the proportion of the loading supported by the soil core increase with increased cross-section *** wall depth is directly proportional to the loading supported by the outer skin friction and the tip resistance of the wall body and is inversely proportional to the loading borne by the soil core.

关键词： diaphragm wall soil core bridge foundation FLAC3D bearing behavior

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