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This paper presents an experimental program that includes 78 fiber reinforced polymer (FRP)-confined square concrete columns subjected to eccentric loading. The degradation of the axial strength of FRP-confined short concrete columns due to the load eccentricity is investigated in this work. A larger load eccentricity leads to a greater decrease in the axial strength. From the test results, it is found that FRP confinement can cause less strength degradation compared with that of unconfined concrete specimens. For FRP-confined square concrete specimens, the strength enhancement due to FRP confinement increases with increasing load eccentricity. However, the increasing load eccentricity decreases the confinement efficiency for FRP-confined circular concrete specimens. The relationship between the strength of eccentrically loaded FRP-confined square columns and their corner radii is evaluated.

Pumpable standing supports without sufficient loading-bearing capacity (LBC) will result in the deformation failure of the pre-driven recovery room (PRR). A combined method of numerical simulation and field investigation is adopted to analyze the failure mechanism of the high-water cementitious material (HWCM) pier cribs and the PRR. The influence of main roof hanging length (MRHL), height-to-diameter ratio, and external constraint strength on the LBC of the HWCM pier cribs are analyzed accordingly. It indicates that when the MHHL increases, the bending deformation of the roof increases (eccentric load and eccentricity increase), the pier cribs gradually change from axial compression to shear sliding failure, the limit LBC of the inby pier crib is reduced from 13.5 to 8.6 MPa, and the maximum roof subsidence of the PRR is increased from 267 to 595 mm. The height-to-diameter ratio is negatively correlated with the LBC of the HWCM pier cribs, but the external constraint strength is positive. A corresponding optimization scheme is proposed and applied to engineering practice. The monitoring results exhibit that the maximum stress on the pier cribs was 18.5 MPa (without failure), and the maximum roof-to-floor convergence of the PRR is 220 mm, ensuring the safe and efficient recovery of mining equipment. Highlights Establishing a UDEC model to analyze the failure mechanism of the pier cribs under the eccentric load induced by advanced abutment pressure and roof rotation sinking. The contribution indicators of MRHL, height-to-diameter ratio, and external constraint strength to the load-bearing capacity of pier cribs were analyzed. A collaborative support method for pier cribs in PRR was proposed and applied to engineering practice, ensuring the recovery of mining equipment.

This study aims to investigate the efficiency of ring footings compared to circular footings in terms of bearing capacity under eccentric loads. The effects of eccentricity were analyzed at ratios of e/Do = (0, 0.1, 0.15, and 0.2) to determine the behavior of the foundations under varying load conditions. The bearing capacity of a circular footing with a diameter of 150 mm and a thickness of 150 mm, along with ring footings with an inner to outer diameter ratio Di/Do = (0.2, 0.3, and 0.4), was assessed on compacted sandy soil with a relative density Dr=75%. Tests were conducted at different depths Df/Do= (0, 0.5, and 1) to evaluate the impact of depth on bearing capacity. The results showed that the ring footing with a Di/Do ratio of 0.4 exhibited the highest bearing capacity ratios, with capacity increasing as depth increased while decreasing with higher eccentricity. Furthermore, the improvement in bearing capacity was attributed to the increased thickness of the footing at greater depths, which enhances soil confinement. This study highlights the importance of designing ring footings as effective solutions for improving bearing capacity in civil engineering applications and addressing increasing structural requirements.

The reliability calculation model of grouting pile foundation under eccentric load was studied. JC method was used to calculate its single reliability. Considering the correlation of failure modes, the narrow limit of the reliability of grouting pile foundation was obtained.

A self-developed finite element limit analysis (FELA) code was employed in this study to investigate the stability of eccentrically loaded strip footings on rock slopes. The research emphasis of this study was on quantifying the inequality phenomenon induced by the slope and eccentric loads of different directions. The generalized Hoek–Brown yield criterion was embedded into the program to simulate the rock nonlinearity. Upper bound theorem, lower bound theorem and adaptive meshing technique were adopted for more reliable calculations. And stability charts were presented to illustrate the influences of various influential factors including the rock property, the slope angle and the footing position on the footing bearing capacity. Furthermore, transformation trends of failure patterns were analyzed for deeper insight into how the failure mechanisms evolving with different influential factors. Detailed design tables were summarized to facilitate the engineering practice and ensure the building safety.

The work at hand proposes a method for assessing, under reasonable hypotheses from an engineering perspective, the failure envelope of a pile group subjected to generalized loading conditions involving a vertical and a lateral force along with a moment. Following different assumptions of increasing complexity, a simple closed-form expression, which is however capable of considering also the strong dependence of sectional yielding moment on the axial force, is derived. The use of such formula, which allows a practical hand calculation of the interaction diagrams at failure, returns conservative yet very accurate results. As a follow up, with reference to reinforced concrete piles, design considerations involving both structural and geotechnical failure under lateral load are reported. It is found that for most cases, if steel reinforcement is established to resist the design bending moment, the geotechnical Ultimate Limit State checks are automatically satisfied.

The accuracy of aerial work platform weighing is essential for safety. However, in practice, the same weight placed at different locations on the platform can yield varying readings, which is a phenomenon known as eccentric load. Measurement errors caused by eccentric loads can lead to missed detections and false alarms in the vehicle safety system, seriously affecting the safety of aerial work. To overcome the influence of eccentric load, the current engineering practice relies on multiple measurements at multiple points and averaging the results to eliminate the eccentric load, which greatly increases the work intensity of workers. To address the aforementioned issues, this paper proposes a three-dimensional force/torque shear force compensation scheme based on bending torque and torsional torque for pressure. The goal is to ensure that the sensor on the aerial work vehicle platform can accurately measure the anti-eccentric load under single-point measurement conditions. A three-box structure anti-eccentric load-weighing sensor for the aerial work platform was designed. Its structure has the advantages of high mechanical strength and no radial effect, ensuring the safety of aerial work, improvement of measurement sensitivity, and enabling of real-time and accurate acquisition of force/torque in three directions. In order to further improve the measurement accuracy of 3D force/torque compensation, a particle swarm optimization algorithm was adopted to optimize the 3D force/torque shear force compensation, thereby improving the safety of engineering operations. Through the verification of a self-made testing platform, the anti-eccentric load sensor designed in this study can ensure that the measurement error of objects at any position on the platform is less than 1.5%, effectively improving the safety of high-altitude platform engineering operations.

The paper studies the anti-eccentric load margin of a novel structure bearing lubricated by low viscosity medium. The lubrication dynamic model considering journal inclination angle is established. The effects of different speeds, loads, and tilted angles on the interface attributes of the bearing under typical working conditions are studied. The results show that the special structure bearing has self-stability margin of anti-tilted and anti-eccentric load. Especially under different speed conditions, analyses show that the eccentric load has little influence on the static/dynamic characteristics of the bearing. Under the same conditions, the stability margin of the bearing is higher than that of traditional bearings. The research provides a theoretical basis for the application of such kinds of special structure bearings.

Eccentric loads applied on ring foundations affect their performance and contact pressure distribution. Nevertheless, reinforcing soils is a passive technique to improve their behavior. The present paper has evaluated the influence of load eccentricity on the behavior and contact pressures of a model ring foundation resting on geogrid-reinforced, very dense sand. Ten tests were carried out in unreinforced and reinforced conditions to this aim. The findings show that an increase in load eccentricity leads to decreasing bearing capacity due to the tilt of the foundation, so that increasing eccentricity ratio to 1/4 led to a substantial reduction of approximately 50% in bearing capacity ratio, and detachment of foundation from the soil surface in its side opposite to load eccentricity. However, reinforcing sand beneath the ring foundation under eccentric loading significantly decreases its differential settlements and improves the load-settlement and load-tilt behavior. The present experimental results are consistent with the analytical method. Moreover, the observations show that the performance of ring foundations under eccentric loading has been improved significantly by reinforcing very dense sand. Contact pressure distribution of the ring foundation tends to change from a saddle shape to a parabolic form due to increased eccentricity. Furthermore, reinforcing sand beneath the foundation leads to the prevention of its detachment from the soil surface.

Forced vibration of a pinned–pinned fluid-conveying straight pipe subjected to eccentric load is analyzed by Green’s function method. Firstly, four equations of motion in vertical and horizontal planes, torsional and axial directions are given directly based on an existing literature. Then forward and inverse Laplace transformations are used to deduce the Green’s functions of all the above four equations, where the transverse motion in horizontal plane is emphasized, especially for the reason that there appears an additional term due to eccentricity. Thirdly, the steady-state displacement responses in closed form along each direction are obtained by integration means. Finally, effects of some key parameters including the angle between load and vertical plane, the angle between load and horizontal plane, and the eccentricity distance on displacement responses are studied. The present research extends the application of Green’s function method and can be radiated to study similar dynamic problems of straight pipes with other supporting formats or curved pipes under eccentric loads.