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...
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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...
Evaluation of the Predictive Models for Stiffness, Strength, and Deformation Capacity of RC Frames with Masonry Infill Walls
Turgay, Tahsin; Durmus, Meril Cigdem; Binici, Barış; Ozcebe, Guney (American Society of Civil Engineers (ASCE), 2014-10-01)
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...
Component based seismic vulnerability assessment procedure for rc buildings
Erduran, Emrah; Yakut, Ahmet; Department of Civil Engineering (2005)
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...
Procedure for determining seismic vulnerability of building structures
Gulkan, P; Sozen, MA (1999-05-01)
A rationalization for ranking reinforced concrete frame buildings with masonry infill walls with regard to seismic vulnerability is presented The method essentially requires only the dimensions of the structure as input, and is expressed in terms of where its attributes are located in a two-dimensional plot of masonry wall and column percentages. It is shown that increasing drift at the ground story (which is a reasonable expression of increasing vulnerability) is attained by decreasing either attribute It ...
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.