Concrete-filled FRP (Fiber Reinforced Polymer) tube composite piles offer superior corrosion resistance, making them a promising alternative to traditional in marine environments. However, their performance under cyclic lateral loads, such as those induced by waves and currents, requires further investigation. This study conducted model tests on 11 embedded sand evaluate behavior loading. Key parameters, including loading frequency, cycle count, mode, embedment depth, were systematically...

Piles in marine environments are subjected to various loads of differing magnitudes and directions, their long-term stability has attracted much attention. Most research focuses on lateral cyclic loading; there few full-scale tests that consider the effects loading at different inclined angles. A strategy was used carry out laboratory study angles pile. The results show a smaller angle (θL) or larger pile–soil relative stiffness (T/L) wider deeper sediment subsidence after 10,000 cycles. As...

In situ vertical load field tests were carried out on two bored piles used in the Chizhou Highway Bridge across Yangtze River, both of which rooted piles. Based test results, such as those relationship between and settlement, axial force distribution, shaft friction pile–soil relative displacement, transfer mechanics analyzed. The results showed that load-carrying curves vary gradually also exhibit bearing characteristics because loads at pile tips are less than 15% total capacity slope...

The interface mechanical behavior of a monopile is an important component the overall offshore wind turbine structure design. Understanding soil—structure interaction, particularly initial stiffness, has significant impact on study natural frequency and dynamic response monopile. In this paper, simplified method for estimating monopiles under lateral loads proposed. Depending principle minimum potential energy virtual work theory, functions soil reaction components at are derived; MATLAB...

To investigate the influence of axial force and its distribution along pile shaft on response laterally loaded piles, a generalized solution is proposed based transfer matrix approach, in which coefficients for piles free, elastic, plastic zones were analytically obtained through Laplace transformation. This method can handle multilayered soil deposits with any form p-y curve. The methodology validated by comparing predictions laboratory model test results. A good match between prediction...

This paper investigates the interface mechanical behavior of flexible piles with Lp/D>10 under lateral load and an overturning moment in monotonic loading conditions. To modify beam-on-Winkler-foundation model offshore wind farms, energy-based variational method is used. The soil treated as a multi-layered elastic continuum assumption three-dimensional displacements, pile modeled Euler-Bernoulli beam. A series cases using MATLAB programming was conducted to investigate simplified equations...

Simplified methods of static free head stiffness the semi-rigid foundation under lateral loads were limited to flexible or rigid behavior by critical length piles. This would lead errors when predicting dynamic performance their upper structures in OWT Systems. paper presents a comprehensive analysis pile without considering length. Firstly, case studies using energy-based variational method encompassing nearly twenty thousand cases conducted. These involved different types foundations,...

Current calculation methods for the vertical bearing capacity of steel pipe piles are predominantly designed smaller diameters and do not account soil inside pile. This necessitates an evaluation their applicability to with exceeding 2.0 m. study aims refine existing formula calculating capacity, as outlined in Port Engineering Foundation Code China, by investigating large-diameter through numerical simulations. By analyzing relationship between internal friction resistance core within...

In various analytical models, modeling the behavior of large-diameter monopiles and piles can be challenging due to these foundations with huge body sizes carrying mechanisms lateral loads surrounding soils. this paper, transfer matrix method Timoshenko beam theory was used modify shear rotation pile sections under different loading stages, including serviceability limit stages ultimate stage. method, a is considered according theory, recurring variables in equation are replaced constants...

Ground settlement prediction for highway subgrades is crucial in related engineering projects. When predicting the ground settlement, sparse sample data are often encountered practice, which greatly affects accuracy. However, this has been seldom explored previous studies. To resolve it, paper proposes a regression Kriging (RK)—based method with data. Under framework of RK, stationarity residual and trend structure key factors It found that use Box–Cox transformation, can help to achieve...

Under long-term horizontal cyclic loading, the evolution characteristics of loading and unloading stiffness piles are an important representation pile–soil interaction. However, research in this area is limited, particularly regarding impact factors like relative stiffness. In study, laboratory tests with a strategy were conducted to study various factors, including different amplitude ratios (ζb), load (ζc), (T/L) sandy soil, on dynamic pile head The results show that normalized cumulative...

The existing studies have primarily focused on the effect of cyclic load characteristics (namely, ratio and amplitude ratio) lateral response monopiles in sand, with little attention paid to pile-soil relative stiffness (KR). This paper presents a series 1-g tests aimed at improving understanding responses under different pile—soil systems. These systems are arranged by two model piles stiffness, including four slenderness ratios (pile embedded length, L, normalized diameter, D) medium dense...

Researching and developing a new type of diaphragm wall foundation can solve the probl em that traditional structure may not meet high standards safety stability underground structures in some specific engineering environments. This paper focuses on horizontal bearing characteristic form foundation, strip-walled wall, through series model tests. In tests, nine plexiglass models with different section sizes, spacings heights, as well loading strategies (horizontal loads along against model),...

Accurately and efficiently evaluating the influence of pile–soil interaction on overall natural frequency wind turbines is one difficulties in current offshore power design. To improve structural safety reliability turbine (OWT) systems, a new closed-form solution method OWTs considering interactions with highly effective calculations established. In this method, Hamilton’s principle equivalent coupled spring model (ECS model) were firstly combined. theory, Timoshenko beam assumption...

The elastoplastic model can more accurately simulate the behavior of soil in process loading, so as to determine resistance accurately, which holds great significance calculating bearing capacity pile foundations. However, current study has not found that elasticity is taken into account analyze dynamic To response foundation under horizontal cyclic load, theoretical calculation methods and tests are applied. Based on flexural differential equation considering inertia force harmonic...

To rapidly and precisely calculate the slender pile response soil resistance under lateral load in offshore wind power projects, energy-based variational method was used to improve calculation of laterally loaded piles layered elastic soil. Firstly, two cases were collected, results compared with that from m-method, numerical analysis or measured data verify accuracy improved this paper. Then, field test a steel pipe an project, those data, considering shear effect distributed moment around...

Soft soil is widely distributed in the riverside area of southern China. The creep deformation characteristics soft affect long-term stability structure foundation, which cannot be ignored. Through triaxial drainage test, with a interlayer from Jiangsu Province were studied. test results show that procedure divided into two stages, exhibiting steady-state and shear shrinkage time stress growth, presents typical nonlinear behavior. Additionally, confining pressure are critical factors...

At present, the interface shear test is mainly used to evaluate anti-sliding performance of new foundation base. However, traditional has certain limitations in simulating load change during construction process and cannot accurately simulate characteristics between structure soil under continuous normal stress. Based on self-developed large-scale equipment, this paper carried out mechanism research cement concrete, sand clay concrete other materials different curing cycles loading unloading...