Three dimensional finite element analysis of a novel bracing system in small deep excavations

Özlü, Pelin
One of the most common retaining systems for deep excavations is by supporting a wall with multiple levels of anchors. In densely built urban areas, preventing soil movement with such a system can be very costly. Additionally, anchored walls are assumed and forced to act independently during design calculations, thus fail to take the advantage of the rigidity of the whole system at the corners of the excavation area. An alternative support system that uses the entire system is bracing of the walls with struts. But such a system greatly hinders construction space. In this research, a new type of supporting system has been investigated by performing a parametric study in finite element analyses program. New system is a single ring at each support level, supporting the system at several locations. A comparative study has been undertaken between the conventional systems and the new system in both 2D and 3D. PLAXIS finite element analysis software was used for the analyses. The primary aim was to investigate the structural and geotechnical performance of the arch supported system. The study revealed that the new system provides improvement for specific cases and can be considered as an alternatve support system for such cases.


Two dimensional finite element modeling for the multi tier pile wall with anchor shoring sysytem
Özyürek, Yunus Emre; Huvaj Sarıhan, Nejan; Department of Civil Engineering (2019)
For deep excavations (such as greater than 20-25 m excavation depths) in urban areas, where there is strict deformation limits, multi-tier pile wall shoring system with soil anchors is becoming more widely used, since the system with one level of piles becomes insufficient or unfeasible. In this study, parameters affecting the behavior of multi-tier pile wall retaining system is investigated via two-dimensional finite element method. Firstly, a 30 m excavation is carried out with a multi-tier shoring system...
A comparative study on different analysis approaches for estimating the axial loads on columns and structural walls at tall buildings
Kurç, Özgür (Wiley, 2013-04-01)
Estimating axial loads on columns and structural walls at tall buildings is a complicated task because time-dependent deformations of concrete and the way the building is constructed affect the way the gravity loads are carried by them. The accurate computation of axial loads is crucial for determining the size and strengths of columns and structural walls. This study investigates several analysis approaches commonly used during the design of such buildings. Construction sequences, time-dependent deformatio...
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Taymuş, Refik Burak; Yılmaz, Mustafa Tolga; Department of Engineering Sciences (2008)
Foundation uplift is the partial separation of a shallow foundation from soil due to excessive load eccentricity. Foundation uplift can significantly change the seismic response of slender structures, and frames as well. In literature, different support models for foundations are employed in order to simulate foundation uplift in seismic analysis of structures. One of the most widely used models is the Winkler model which assumes distributed tensionless springs beneath a shallow foundation. In this study, t...
The Effect of infill walls on the seismic performance of boundary columns in reinforced concrete frames
Fenerci, Aksel; Binici, Barış; Department of Civil Engineering (2013)
Reinforced concrete frames with unreinforced masonry infill walls constitute a significant portion of the building stock throughout the world. Infill walls in these buildings are generally considered as non-structural elements and neglected during design and assessment. On the other hand, observations after several earthquakes revealed that infill walls may have detrimental effects on the adjacent frame members. This observation brings out the requirement for further research on the effects of infill walls ...
An Experimental study on static and dynamic behaviour of model pile foundations
Ünsever, Yeşim Sema; Özkan, M. Yener; Department of Civil Engineering (2015)
When the subsoil beneath a structure is weak to carry the loads from the superstructure, use of piled foundations is one of the widely employed alternatives. These types of foundations may also be subjected to transient or cyclic lateral loads arising from earthquake, wind, etc. Detailed case histories of dynamically loaded pile foundations are not too many in the literature. In this study, a series of static cyclic horizontal load tests and 1-g shaking table tests on various model foundations, such as pile...
Citation Formats
P. Özlü, “Three dimensional finite element analysis of a novel bracing system in small deep excavations,” M.S. - Master of Science, Middle East Technical University, 2012.