Undrained Strength and Deformation Parameters from Pressuremeter Test Results

2008 ◽  
pp. 324-324-15 ◽  
Author(s):  
WF Anderson ◽  
IC Pyrah
Keyword(s):  
Test Results ◽  
Pressuremeter Test ◽  
Deformation Parameters ◽  
Strength And Deformation ◽  
Undrained Strength

Shear connection between precast concrete bridge segments built with thin-walled elements

2021 ◽  
Author(s):  
Tobias Huber ◽  
Stephan Fasching ◽  
Johann Kollegger
Keyword(s):  
Precast Concrete ◽  
Deformation Behaviour ◽  
Lateral Force ◽  
Test Results ◽  
Construction Time ◽  
Shear Connection ◽  
Force Transfer ◽  
Strength And Deformation ◽  
Thin Walled ◽  
Segmental Bridge

<p>Segmental bridge construction combines the advantages of prefabrication, for example the reduction of construction time and very high product quality, with those of common bridge erecting methods. Short precast segments are assembled and prestressed to form the complete superstructure. New methods divide these segments into prefabricated elements to create new lighter versions of the segments. For this to work, new joint types must be developed which can ensure the force transfer between the segments. In this paper, several methods, including a new concept for joining thin-walled pre-fabricated elements, are described. Push-off tests with a constant lateral force were carried out to assess the shear strength and deformation behaviour. The main parameters were the joint type (wet joints: plain, grooved, keyed; dry joints), the mortar type, and the level of lateral force. In this paper, the test results are presented and recalculations with a design code are shown.</p>

Laboratory Testing: Assessing BS 5930

1986 ◽  
Vol 2 (1) ◽  
pp. 43-52 ◽  
Author(s):  
D. W. Hight
Keyword(s):  
Effective Stress ◽  
Site Investigation ◽  
Triaxial Tests ◽  
Cohesive Soils ◽  
Deformation Parameters ◽  
Strength And Deformation ◽  
Soil Behaviour ◽  
Measured Strength ◽  
Linear Nature

AbstractEstablished patterns of soil behaviour are used to illustrate: the divergence between parameters from laboratory and in situ tests; the changes in effective stress caused by sampling; and the influence of initial effective stress, p′0 on the measured strength and deformation parameters for cohesive soils.Current practice in onshore site investigation continues to make use of the unconsolidated undrained triaxial test in which p′0 is not controlled. Variations in p′0 after sampling and subsequent handling are shown to contribute to the scatter in undrained compression strength data.A plea is made for BS 5930 to encourage the measurement of effective stress in all undrained triaxial tests; to recognise the non-linear nature of soils; and to urge integration of laboratory and in situ tests.

scholarly journals Fluence of age factor on main strength and deformative properties of timber

2020 ◽  
pp. 35-41
Author(s):  
С.С. Гомон С.С.
Keyword(s):  
Experimental Studies ◽  
Solid Wood ◽  
Test Machine ◽  
Hydraulic Test ◽  
Coniferous Species ◽  
Deformation Parameters ◽  
Average Maximum ◽  
The Press ◽  
Strength And Deformation ◽  
Experimental Researches

The analysis of literature sources on this topic is carried out. It was found that the influence of age on the main strength and deformation parameters has not been studied. The method of experimental researches of coniferous and deciduous species of solid wood of different age at one-time short-term loading along fibers is resulted. To solve the problems, a series of samples of 1 sort of solid wood in the form of prisms with a cross section of 30x30x120 mm were made. The following species of wood were tested: coniferous species - larch, pine, spruce; deciduous - birch, alder, ash. The age of wood was 20, 40, 60 years. At the time of testing, the moisture was 12%. The humidity of the wood was controlled using a moisture meter MD-814. Experimental studies were performed on a servo-hydraulic test machine STM-100 under a rigid load regime (by increasing the displacements of the press plate of the test machine). Based on the obtained results, complete diagrams of deformation of deciduous (birch, alder, ash) and coniferous (larch, pine, spruce) species of solid wood at different ages (60, 40, 20 years) were constructed. The number of twin samples that were tested was 126 pieces. The main strength and deformation parameters were determined experimentally, in particular the average critical deformations of all studied wood species and the corresponding average maximum stresses. It is established that in the case of a rigid test regime, the deformation diagram of solid wood necessarily has two branches - ascending and descending. That is, the samples work in the so-called supercritical stage of work. It was found that the age of wood directly affects the strength and deformability of solid wood. In particular, with increasing age from 20 to 60 years, the strength and deformability of deciduous and coniferous species of solid wood increases significantly. Based on the test results, conclusions were drawn. Further research on this topic is highlighted.

Bearing capacity of strip footings on sand over clay

2019 ◽  
Vol 56 (5) ◽  
pp. 699-709 ◽  
Author(s):  
Seyednima Salimi Eshkevari ◽  
Andrew J. Abbo ◽  
George Kouretzis
Keyword(s):  
Bearing Capacity ◽  
Finite Thickness ◽  
Experimental Studies ◽  
Shallow Foundations ◽  
Sand Layer ◽  
Test Results ◽  
Capacity Model ◽  
Proposed Model ◽  
Undrained Strength ◽  
Strip Footings

Estimation of the bearing capacity of shallow foundations on layered soil profiles, such as a sand layer of finite thickness over clay, is mainly based on empirical models resulting from the interpretation of experimental test results. While it is generally accepted that such models may be applicable to soil properties and footing geometries outside the range tested experimentally, they offer limited insights on how the assumed failure mechanism affects their range of application. In particular, the contribution of the sand layer to the overall capacity is accounted for via simple considerations, which are valid only for a specific range of problem parameters. This paper addresses the estimation of the undrained bearing capacity of a rigid strip footing resting on the surface of a sand layer of finite thickness overlying clay, using finite element limit analysis (FELA). The rigorous upper and lower bound theorems of plasticity are employed to bracket the true bearing capacity of the footing, and identify the geometry of possible failure mechanisms. Insights gained from FELA simulations are used to develop a new simple bearing capacity model, which captures the variation in shear resistance from the sand layer with the dimensionless undrained strength of the clay layer. The proposed model provides results that are in close agreement with published experimental studies, and allows treating simple problems, such as the design of working platforms, without having to resort to numerical simulations.

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