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.


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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...
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In vast majority of geotechnical structures such as monopile or strip foundation, which are subjected to repeated loading, long-term resilience of the structures is directly related with the behavior of granular materials subjected to cyclic loading. Repeatedly loaded structure distributes stress to soil that surrounds the structure. When granular materials are exposed to cyclic loading, plastic strain occurs despite the applied stress is less than plastic yield, which results to residual settlement. This t...
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Buildings with masonry infill walls (MIWs) in reinforced concrete (RC) frames are commonly used all around the world. It is well known that infill walls may affect the strength, stiffness, and displacement ductility of the structural system. Different approaches have been adopted in different codes and guidelines to consider the stiffness and strength contribution of MIWs on RC frame behavior. This study compares the ability of the existing guidelines to estimate stiffness, strength, and deformability of RC...
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A detailed seismic performance assessment procedure has been developed for reinforced concrete frame buildings with masonry in-fill walls and reinforced concrete frames including shear walls. The procedure uses member damage functions, in terms of inter-story drift ratios, developed for the primary components: columns, beams, in-fill walls and shear walls. Analytical investigations carried out to determine the influence of a number of parameters on the damageability of components were combined with existing...
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.