scholarly journals EXPERIMENTAL STUDY ON COLLAPSE MECHANISM OF TUNNEL LINING AND EFFECT OF REINFORCING MATERIAL ON LOAD-BEARING CAPACITY OF TUNNEL LINING

2008 ◽  
Vol 64 (3) ◽  
pp. 311-326
Author(s):  
Hideto MASHIMO ◽  
Atsushi KUSAKA ◽  
Nobuharu ISAGO ◽  
Tsutomu KITANI ◽  
Shinobu KAISE
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Tunnel Lining ◽  
Collapse Mechanism ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Reinforcing Material

An experimental study of the effects of moisture variations and gradients in the joint area in steel-timber dowel joints

Holzforschung ◽  
2008 ◽  
Vol 62 (2) ◽  
pp. 243-247 ◽  
Author(s):  
Johan Sjödin ◽  
Erik Serrano
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Climate Changes ◽  
Mechanical Load ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Moisture Effect ◽  
Joint Area ◽  
Moisture Effects ◽  
Induced Stresses

Abstract This experimental study examines the influence of moisture variations on the load-bearing capacity of steel-timber dowel joints. The glulam specimens used to manufacture the joints were first exposed to controlled climate changes. After being stored in the climate chambers, holes were drilled and dowels were inserted. Then, the joints were loaded to failure. The main aim of this study was to investigate how and to what extent moisture variations and gradients in the joint area affects the load-bearing capacity in tension parallel to the grain. The load-bearing capacity was found to be reduced under these conditions when compared to reference joints. Moreover, the brittleness of the joints increased with the time the joints had been exposed to drying. Moisture-induced stresses and cracks in the joint area were found to be a possible explanation of the results. A similar interpretation was given in other studies where other structural timber elements have been studied. This raises an important question of how such moisture effects should be considered in design codes. One possibility is to include the influence of moisture-induced stresses in the k mod factor used in Eurocode 5. Another way could be to consider this type of moisture effect as an equivalent mechanical load case.

scholarly journals Torsional Stability Assessment of Columns Using Photometry and FEM

Buildings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 162
Author(s):  
Krzysztof Wierzbicki ◽  
Piotr Szewczyk ◽  
Wiesław Paczkowski ◽  
Tomasz Wróblewski ◽  
Szymon Skibicki
Keyword(s):  
Bearing Capacity ◽  
Laser Scanning ◽  
Structural Changes ◽  
Industrial Structure ◽  
Critical Force ◽  
Collapse Mechanism ◽  
Plant Structure ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Soil Subsidence

This paper presents a numerical analysis of the load-carrying capacity of steel open-section columns of a coal power plant structure. The structure was subjected to soil subsidence, which led to considerable structural deformations and damages. As a result, additional stresses appeared in the structure, and the static scheme of the structure was changed. To assess the influence of structural changes on the safety of the structure, a detailed investigation was necessary. Laser scanning was used to collect information concerning the geometry of structural elements. Results of the scanning were implemented in a numerical model of the structure. A complex finite element method (FEM) shell model of the column in ABAQUS software was developed. Torsional buckling stability analysis of column members was carried out. Different boundary conditions depending on the type of column connections to other elements were considered. Torsional deformations were treated as imperfections. Analysis showed that the connections of bracing elements, e.g., beams in multilevel frame, directly affected the collapse mechanism and load-bearing capacity of the investigated element. Finally, the paper showed that an appropriate change in the connections between the analyzed column and multilevel frame beams prevents the column from twisting, thereby increasing the critical force and load-bearing capacity of the analyzed industrial structure.

Experimental Study on All-Lightweight Aggregate Concrete Columns under Eccentric Loading

2012 ◽  
Vol 517 ◽  
pp. 392-397
Author(s):  
Yan Min Yang ◽  
Hao Zhang
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Lightweight Aggregate ◽  
Concrete Columns ◽  
Lightweight Aggregate Concrete ◽  
Fine Aggregate ◽  
Mechanical Behaviors ◽  
Load Bearing Capacity ◽  
Aggregate Concrete ◽  
Load Bearing

A kind of lightweight sand was only used as the fine aggregate to make the all-lightweight aggregate concrete, which can significantly reduce the gravity load of a structure and the foundation loads. Accordingly, the application of all-lightweight aggregate concrete in the construction projects can reduce the cost of foundation as well as construction project. In order to develop a new multi-story structural system which has a multifunction of load-bearing, lightweight and energy saving, the paper carried out an experimental study on the mechanical behaviors of six all-lightweight aggregate concrete columns with symmetrical reinforcement under eccentric loading. The failure modes, deformation characteristics and load-bearing capacity of the columns were analyzed. The effect of reinforcement ratio, stirrup ratio and eccentricity on the mechanical behaviors of the columns under eccentric loading were discussed. The test results show that all-lightweight aggregate concrete columns were loaded to failure with high load-bearing capacity and good ductility. The excellent mechanical behavior and the possibility of replacing the normal concrete with all-lightweight aggregate concrete were verified.

Experimental Study of Twin Round Bamboo Concrete Infill Parabolic Tied Arch

2012 ◽  
Vol 517 ◽  
pp. 208-212 ◽  
Author(s):  
Smita Chugh ◽  
Anurag Kandya ◽  
Korde Chaaruchandra ◽  
P. Sudhakar
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Bearing Capacity ◽  
Affordable Housing ◽  
Loading Condition ◽  
Structural Strength ◽  
Structural Element ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Small Thickness

This paper is concerned about the experimental study of twin round bamboo concrete infill composite parabolic tied arch. Experimental investigation is undertaken to validate the structural load bearing capacity of haritha infill arch. The infill arch is tested under three types of loading condition viz a) crown point loading, b) centre half loading and c) distributed point loading. The experimental results brings out the stiffness of the arch to be 1 kN/mm under crown point loading, 1.67 kN/mm under centre half loading and 1.17 kN/mm under distributed loading. The stresses in the materials are well within their allowable limits. Thus this paper is able to successfully report the structural strength of parabolic tied infill arch which promises to be a structural load bearing element. Since, there is no additional formwork required in casting of the arch, apart from the bamboo which itself acts like the formwork, lesser quantity of steel and very small thickness of concrete being involved, the arch qualifies to be a potential structural element for affordable housing and green constructions.

scholarly journals Experimental research of beams with corrugated web

2018 ◽  
Vol 196 ◽  
pp. 01005 ◽  
Author(s):  
Vladimir Zubkov ◽  
Alexey Lukin ◽  
Vadim Alpatov
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Limit State ◽  
Experimental Methodology ◽  
Measuring Instruments ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Load Transmission ◽  
Corrugated Web ◽  
Concentrated Forces

The paper presents an experimental methodology, measuring instruments, equipment and results of an experimental study of beams with corrugated sinusoidal-shaped web. It also investigates the influence of parameters on the beams load bearing capacity. The researchers obtained data on critical loads and types of the extreme limit state at action of concentrated forces with various width of a load transmission section. They also assessed load bearing capacity of beams with different length and section height when work according to single-span jointed scheme.

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