scholarly journals Numerical Investigation of Structural Behaviour of Historical Stone Arches

2019 ◽  
Vol 3 (2) ◽  
Author(s):  
Marco Bovo
Keyword(s):  
Numerical Investigation ◽  
Structural Behaviour ◽  
Stone Arches

Structural analysis of old stone arch bridges

1989 ◽  
Vol 16 (6) ◽  
pp. 789-797 ◽  
Author(s):  
D. K. McNeely ◽  
G. C. Archer ◽  
K. N. Smith
Keyword(s):  
Structural Analysis ◽  
Structural Integrity ◽  
Load Capacity ◽  
Structural Response ◽  
Secondary Effects ◽  
Structural Behaviour ◽  
Limit States ◽  
Significant Deterioration ◽  
Arch Bridges ◽  
Stone Arches

The use of stone arches for bridge construction has generally ceased, but since these structures still exist in modern road systems, their structural integrity is of current concern. This paper presents an analysis technique suited for the thick jointed heritage stone arch bridges found in Canada. The effect of increased mortar joint size on structural response is investigated. The response of a section to eccentric thrust is postulated and the effective section properties are derived. Structural behaviour proceeds from a fixed arch to a two-hinge, a three-hinge, and finally a five-hinge failure mode for a symmetrical arch with midspan loading. A typical load–deflection curve is developed, suitably adjusted for secondary effects due to changes in geometry and material nonlinearity. Stone arch bridges in Canada were constructed with thick mortar joints, which exhibit significant deterioration of stiffness with load eccentricity and, therefore, significant secondary effects; as thickness increases, ultimate strength decreases. A suitable limit states prediction for the load capacity of old stone arches is proposed. Key words: arch, bridge, heritage, limit states, stone, structural analysis.

Structural Behaviour of Historical Stone Arches and Vaults: Experimental Tests and Numerical Analyses

2014 ◽  
Vol 628 ◽  
pp. 43-48 ◽  
Author(s):  
Marco Bovo ◽  
Claudio Mazzotti ◽  
Marco Savoia
Keyword(s):  
Mechanical Response ◽  
Numerical Solutions ◽  
Experimental Tests ◽  
Element Model ◽  
Seismic Effect ◽  
Structural Behaviour ◽  
In Situ Tests ◽  
Different Types ◽  
Non Linear ◽  
Stone Arches

Recent seismic events showed the dramatic need, especially in case of historical and existing buildings, of important strengthening activities to be carried out. In order to properly design them, a careful assessment of real structural behaviour and load-carrying capacity of these buildings is strongly required. This is particularly important when dealing with constructions made of heterogeneous materials like masonry or stonework, where often conventional analysis techniques do not behave satisfactorily. This paper presents the results of an extensive experimental and numerical investigation on historical stone arches and vaults. A series of in-situ tests were carried out on different types of stone arches belonging to a large building of the XIX century, with the purpose of investigating their mechanical response and obtaining the structural behaviour of stonework under different types of in-plane loads. The experimental results were compared with the numerical solutions obtained by a detailed finite element model of a portion of the structure. Numerical linear and non-linear FE analyses were conducted in order to reproduce the experimental tests and analyse the interaction between series of arches that are linked by cross vault or tunnel vault. Finally, non-linear analyses with vertical and horizontal loads were carried out with the scope of simulating the seismic effect and to verify the ductility of this type of vaulted structures.

scholarly journals Numerical Analysis on the Collapse of a RC Frame

2016 ◽  
Vol 12 (4) ◽  
pp. 22-35
Author(s):  
George Bogdan Nica ◽  
Florin Pavel
Keyword(s):  
Numerical Investigation ◽  
Concrete Strength ◽  
Collapse Mechanism ◽  
Rc Frame ◽  
Good Match ◽  
Structural Behaviour ◽  
Collapse Analysis ◽  
Rc Slab ◽  
Applied Element Method ◽  
The Impact

Abstract This paper focuses on the collapse analysis of a planar RC frame. This research is based on an experimental study presented in the literature. The analyses are conducted using a dedicated software based on the Applied Element Method. This numerical method is able to model accurately all the structural behaviour stages leading up to the collapse itself. A very good match between the experimental and numerical results is observed. The numerical investigation highlights several behaviour stages for the model RC frame. Moreover, the contribution of the RC slab and the impact of the concrete strength on the overall collapse mechanism is discussed and evaluated through numerical investigation.

Why Broadgate Phase 8 composite floor did not fail under fire

2017 ◽  
Vol 8 (3) ◽  
pp. 238-257 ◽  
Author(s):  
Simon Mwangi
Keyword(s):  
Numerical Investigation ◽  
Numerical Models ◽  
Thermomechanical Analysis ◽  
Large Strains ◽  
Structural Behaviour ◽  
Membrane Action ◽  
Content Type ◽  
Strain Pattern ◽  
Fire Scenarios ◽  
The One

Purpose This paper aims to present the findings of a numerical investigation into the performance of the steel-concrete composite floor involved in Broadgate Phase 8 fire. Design/methodology/approach The investigation is conducted by carrying out a 3-D thermomechanical analysis of a composite floor similar to the one involved in the fire using ANSYS. Four fire scenarios are investigated, with each producing a unique stress – strain pattern. The results obtained are compared with the observations made after the fire and inferences drawn. Findings The results obtained are found to be correlated with the observations made after the fire. The performance of the composite floor is found to be dominated by development of large strains, leading to large deflections. Furthermore, colder parts of the structure, through redistribution of forces, are found to have a profound impact on the ability of a composite floor to resist heating effects. From the findings, it is concluded that connections’ design, occurrence of membrane action and thermal restraints were the key reasons the floor did not fail. Originality value The study takes a more forensic approach. This is a departure from majority of published literature, where comparison is usually between experimental and numerical results. By comparing the findings from a real fire with those of a numerical investigation, the study provides an insight into the accuracy of applying numerical models for the prediction of effects of fire on structural behaviour.

Advanced numerical investigation into structural behaviour of high-strength cold-formed steel lapped Z-sections with different overlapping lengths

2016 ◽  
Vol 20 (7) ◽  
pp. 1074-1097
Author(s):  
Ho Cheung Ho ◽  
Kwok-Fai Chung
Keyword(s):  
Finite Element ◽  
Numerical Investigation ◽  
Steel Structures ◽  
High Strength ◽  
Ductile Deformation ◽  
Finite Element Models ◽  
Deformation Characteristics ◽  
Structural Behaviour ◽  
Wide Range ◽  
Cold Formed Steel

In order to improve buildability of cold-formed steel structures, a series of research and development projects have been undertaken by the authors to examine structural behaviour of bolted moment connections between cold-formed steel sections. In this article, a systematic numerical investigation with advanced finite element modelling technique into the structural behaviour of high-strength cold-formed steel lapped Z-sections under gravity loads is presented, and details of the modelling techniques are presented thoroughly. It aims to examine deformation characteristics of these lapped Z-sections with different overlapping lengths. After careful calibration of advanced finite element models of lapped Z-sections against test data, it is demonstrated that the predicted moment rotation curves of these models follow closely the measured data not only up to the maximum applied moments but also at large deformations. In general, all of these lapped Z-sections are unable to resist sustained loadings after section failure under combined bending and shear, and they exhibit sudden unloadings once the maximum applied loads are attained. Hence, the proposed finite element models are able to simulate highly non-ductile deformation characteristics of these Z-sections. While long overlapping lengths over internal supports in multi-span cold-formed steel purlin systems are often advantageous in terms of both ‘stiffness and strength’, more steel materials are used at the same time. Hence, it is very desirable to establish an efficient use of the lapped Z-sections with optimal overlapping lengths. A total of six models with different overlapping lengths are then extended to simulate the structural behaviour of lapped double-span beams, and extensive material and geometrical non-linear analyses have been carried out. It is found that lapped double-span beams with practical overlapping lengths tend to behave superior to continuous double-span beams in terms of both load resistances and deformations. Depending on the overlapping lengths of the lapped Z-sections, different system failure mechanisms have been clearly identified after significant moment redistribution within the beams, and their structural behaviour has been compared in a rational manner. Consequently, these models will be readily employed to investigate the structural behaviour of high-strength cold-formed steel lapped Z-sections under a wide range of practical loading and boundary loading conditions for possible development of effective design rules.

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