Challenge Journal of Structural Mechanics

48-58

Authors: Laurie F. Boswell, Brett McKinley

Structural monitoring using optical fibre technology may be undertaken to establish the long-term behaviour of structures, components and materials of construction. Condition monitoring may be used as an aid to repair and strengthening schedules. The establishment of material durability is also part of the monitoring process. The paper describes and discusses the application and development of the use of optical fibres to monitor structures. Examples have been given in which strain, temperature and moisture content have been determined for structural elements and materials of construction. Of particular interest is the use of an optical fibre monitoring system to determine the performance of an actual bridge, which has been subjected to controlled loading conditions. The results, which have been described, demonstrate the enormous potential to monitor structures using optical fibres.

65-70

Authors: Turgut Öztürk, Zübeyde Öztürk, Onur Öztürk

A lateral load carrying system consisting of only shear walls is used generally for structures having 14 storeys or more. It can be seen that the effect of earthquakes in the systems consisting of the shear walls or shear walls-core are very small. For resisting earthquake effects it is proposed to construct shear walls which are perpendicular to each other in plan and having the cross sectional area 1.5% of the building. Unfortunately in this proposal, the effect of number of storeys and the division of shear wall area to the necessary parts is not taken into consideration. In this paper, these factors are considered as, number of storeys, plan area of a storey, earthquake risk zone, material properties and shear wall thickness. The criteria for determination of the dimensions of earthquake shear walls which are suitable for architectural considerations of the building are given. For various storey areas and 10 storeys, the lengths of shear walls which ensure the suggested criteria, having the same length are given in diagrams. It is also shown how to find the length of shear walls under the same conditions if there are more than 10 storeys.

78-83

Authors: Korhan Özgan, Ayşe T. Daloğlu

The purpose of this study is to determine the effects of various parameters such as the aspect ratio, subgrade reaction modulus and thickness/span ratio on the frequency parameters of thick plates resting on Winkler-type elastic foundations. For this purpose, 4-noded (PBQ4) and 8-noded (PBQ8) Mindlin plate elements are adopted for the analysis using Winkler foundation model. Two different integration rules, namely the full integration (FI) and the selective reduced integration (SRI) techniques, are used to obtain stiffness matrix of plates. The results obtained in this study are compared with the results that are obtained by SAP2000 structural analysis software.

90-95

Authors: Cemal Eyyubov, Şükran Genç, Canan Yılmaz

In this study, there are the research results of the stress conditions under the influence of temperature variations in rigidity shear members between columns having different constructive formations. Here, the connections are conveyed that characterize the variation of internal forces resulting from temperature variations in rigidity shear members related to the length and height of the structural system. Principles are investigated in order to be able to calculate the earthquake and wind loads of rigidity shear by taking the combinations with the loads resulting from the temperature variation into consideration.