scholarly journals Behaviour of Pre-Cracked Self-Healing Cementitious Materials under Static and Cyclic Loading

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1149 ◽  
Author(s):  
Giovanni Anglani ◽  
Jean-Marc Tulliani ◽  
Paola Antonaci
Keyword(s):  
Cyclic Loading ◽  
Bearing Capacity ◽  
Peak Force ◽  
Self Healing ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Number Of Cycles ◽  
Static And Cyclic Loading ◽  
Static Conditions ◽  
Cycles To Failure

Capsule-based self-healing is increasingly being targeted as an effective way to improve the durability and sustainability of concrete infrastructures through the extension of their service life. Assessing the mechanical and durability behaviour of self-healing materials after damage and subsequent autonomous repair is essential to validate their possible use in real structures. In this study, self-healing mortars containing cementitious tubular capsules with a polyurethanic repairing agent were experimentally investigated. Their mechanical behaviour under both static and cyclic loading was analysed as a function of some factors related to the capsules themselves (production method, waterproof coating configuration, volume of repairing agent stored) or to the specimens (number, size and distribution of the capsules in the specimen). Their mechanical performances were quantified in terms of recovery of load-bearing capacity under static conditions and number of cycles to failure as a function of the peak force under cyclic conditions. Positive results were achieved, with a maximum load recovery index up to more than 40% and number of cycles to failure exceeding 10,000 in most cases, with peak force applied during cyclic loading at least corresponding to 70% of the estimated load-bearing capacity of the healed samples.

scholarly journals Evaluating the Load-Bearing Capacity of a Section of the Orenburg-Zainsk Main Gas Pipeline Using Static and Cyclic Loading Methods

2021 ◽  
Vol 225 ◽  
pp. 01012
Author(s):  
Mekhrali M. Aliyev ◽  
Sergey P. Zaytsev ◽  
Zulfiya F. Ismagilova ◽  
Minsariya M. Bayburova
Keyword(s):  
Cyclic Loading ◽  
Bearing Capacity ◽  
Gas Pipeline ◽  
Design Parameters ◽  
Load Bearing Capacity ◽  
Internal Corrosion ◽  
Load Bearing ◽  
Loading Methods ◽  
Static And Cyclic Loading ◽  
Main Gas Pipeline

This paper examines the operability of the Orenburg-Zainsk main gas pipeline, which has been in operation since 1971 and has various general defects, as well as specific defects such as internal corrosion-induced delaminations and blisters of various geometric shapes. The design parameters of the gas pipeline section and the characteristics of the pipe metal have been studied. Hydraulic tests were performed on the pipe fragments in the form of sample barrels to determine the load-bearing capacity in order to evaluate the operability of the gas pipeline. There were three types of sample barrels: those made from pipes with internal blistering and delamination, from pipes with invisible defects, and from emergency stock pipes. A cyclic test was performed on one sample according to the developed method. The theoretical analysis of the load-bearing capacity of the gas pipeline was performed according to the accepted design model.

scholarly journals Modelling and calibration for cyclic soil-structure interface behaviour

2019 ◽  
Vol 92 ◽  
pp. 13007
Author(s):  
Borana Kullolli ◽  
Pablo Cuéllar ◽  
Matthias Baeßler ◽  
Hans Henning Stutz
Keyword(s):  
Cyclic Loading ◽  
Constitutive Model ◽  
Bearing Capacity ◽  
Steel Plates ◽  
Experimental Investigations ◽  
Load Bearing Capacity ◽  
Practical Advantage ◽  
Load Bearing ◽  
Ring Shear ◽  
Shearing Resistance

The structural performance of many geotechnical systems (e.g. axially-loaded pile foundations), depends on the shearing resistance at the soil interface, which may govern the load bearing capacity of the foundation. Experimental investigations have shown that this interaction is mainly localised within a narrow shear band next to the structure. Under cyclic loading, a contraction of the soil at the interface may arise (net volume loss), possibly leading to a stress relaxation and thus to a reduction of the load bearing capacity (the so-called friction fatigue). Based on the constitutive similarities between soil continua and interfaces, we propose here the adaption of a Generalized Plasticity model for sandy soils for the numerical analysis of interface problems. In this contribution, the results of an experimental campaign for the parameter calibration of the constitutive model are presented. The tests have been conducted with a ring shear device involving different normal stresses, roughness of the steel plates as well as cyclic loading. The new modelling approach shows promising results and has the additional practical advantage that the interface zone and the soil continuum can both be described with the same constitutive model in general boundary value problems.

scholarly journals Experimental Study on a Prefabricated Lightweight Concrete-Filled Steel Tubular Framework Composite Slab Structure Subjected to Reversed Cyclic Loading

2019 ◽  
Vol 9 (6) ◽  
pp. 1264 ◽  
Author(s):  
Jia Suizi ◽  
Cao Wanlin ◽  
Liu Zibin ◽  
Ding Wei ◽  
Su Yingnan
Keyword(s):  
Cyclic Loading ◽  
Bearing Capacity ◽  
Lightweight Concrete ◽  
Lateral Load ◽  
Dissipated Energy ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Reversed Cyclic Loading ◽  
Window Opening ◽  
Reversed Cyclic

A building structure comprising a prefabricated lightweight concrete-filled steel tubular (CFST) framework composite slab structure is proposed. Five full-scale specimens (i.e., one empty framework and four-walled frameworks) were tested under reversed cyclic loading to study their earthquake-resistance performance. Of the four wall specimens, three were walled using composite slabs, one had no openings, one had a window opening, and one had a door opening. One was walled with a concealed steel-truss slab. A comparative study on the strength, stiffness, ductility, hysteresis characteristics, and dissipated energy of the specimens was performed. The working mechanism of the framework and slab was then analyzed. The results show that, if reasonably assembled and connected, the framework and slab work in a well-coordinated manner. The walled framework had greater lateral load-bearing capacity, better energy-dissipation, greater stiffness reduction, and better deformability than an empty framework. The area and type of slab opening had a significant impact on structural performance because a door or window opening contributed to a smaller lateral load-bearing capacity and initial secant stiffness of the structure. However, this had no clear impact on the accumulative dissipated energy of the structure.

Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element

2020 ◽  
Vol 62 (1) ◽  
pp. 55-60
Author(s):  
Per Heyser ◽  
Vadim Sartisson ◽  
Gerson Meschut ◽  
Marcel Droß ◽  
Klaus Dröder
Keyword(s):  
Bearing Capacity ◽  
Load Bearing Capacity ◽  
Load Bearing

Load-Bearing Capacity of Direct Inlay-Retained Fibre-reinforced Composite Fixed Partial Dentures with Different Cross-Sectional Pontic Design

2017 ◽  
Vol 68 (1) ◽  
pp. 94-100
Author(s):  
Oana Tanculescu ◽  
Adrian Doloca ◽  
Raluca Maria Vieriu ◽  
Florentina Mocanu ◽  
Gabriela Ifteni ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Fracture Pattern ◽  
Load Bearing Capacity ◽  
Cross Sectional ◽  
Load Bearing ◽  
Reinforced Composite ◽  
Polyethylene Fibre

The load-bearing capacity and fracture pattern of direct inlay-retained FRC FDPs with two different cross-sectional designs of the ponticwere tested. The aim of the study was to evaluate a new fibre disposition. Two types of composites, Filtek Bulk Fill Posterior Restorative and Filtek Z250 (3M/ESPE, St. Paul, MN, USA), and one braided polyethylene fibre, Construct (Kerr, USA) were used. The results of the study suggested that the new tested disposition of the fibres prevented in some extend the delamination of the composite on buccal and facial sides of the pontic and increased the load-bearing capacity of the bridges.

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