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Experimental and theoretical research on large-diameter rock-socketed pile embedded depth

Li Yanfeng, Zhao Jihe, Xiong Ying, Wang Qinghe

Archives of Civil Engineering

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2021

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Vol. 67, nr 2

537--550

EN

A theoretical formula for large-diameter rock-socket depth is developed to support pail embedding in a large bridge pile foundation project. There is a horizontal additional stress concentration at the place where the soil around the rock-socketed pile meets the soil layer under the horizontal load. When the rock-socketed tip stress and bending moment of the pile are relatively small, the pile shows favourable embedment effect and the pile foundation can be considered safe. The function curve of soil resistance around the pile under the action of horizontal force was obtained by finite element analysis. The force characteristics reveal the depth of the largediameter rock-socketed pile under the horizontal load. As the rock-socketed pile rotates under the action of horizontal force, the rock mass resistance around the pile changes according to the cosine. The distribution of pileside soil resistance is proportional to the displacement and distributed according to the sine. A comprehensive correction coefficient of pile shaft resistance β is introduced to deduce the theoretical formula of the depth hr of the large-diameter rock-socketed pile embedded in the bedrock. It is verified through both experiments and numerical analysis.

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Zamontuj poprawnie ścianę osłonową z nową instrukcją. Cz.2

Jehl Wolfgang, Benitz-Wildenburg Jürgen

Świat Szkła

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2020

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R. 25, nr 6

8--9, 12, 37

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Vibrations of point-supported rectangular thin plate subjected to a moving force

Zakęś F.

Engineering Transactions

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2016

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Vol. 64, iss. 4

409--415

EN

In this paper, the dynamic behaviour of a rectangular thin plate simply supported on all edges and point supported within its region is investigated. The problem is solved by replacing this type of structure with a simply supported plate subjected to a given moving load and redundant forces situated in positions of intermediate point supports. Redundant forces are obtained by solving Volterra integral equations of the first order, which are compatibility equations corresponding to each redundant. Solutions for a simply supported plate loaded with a moving point force and concentrated time-varying force are given. Difficulties of solving Volterra integral equations analytically are bypassed by applying a simple numerical procedure. Finally, a numerical example of a plate with two point supports is presented in order to show the effectiveness of the presented method.

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Wpływ skręcania arkuszy w powłoce z blach fałdowych na współdziałanie fałd w przenoszeniu obciążenia skupionego

Reichhart A., Dudziński P.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2004

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z. 37[211], cz.1

319-326

EN

The authors have examined a shell of three T55x0.88 sheets loaded in the middle of its span, using six different torsion angles. A bend caused by concentrated load placed in the middle of the central fold spreads throughout the sheet's length, however perpendicularly it attains only two neighbouring folds on each side. Table 2 and picture 7 show the percentage share of these five folds in load carrying. Twist angle of the shell has little influence on the participation of folds in carrying the load.