eng
Shiraz University
Iranian Journal of Science and Technology Transactions of Civil Engineering
2228-6160
2013-08-01
37
2
337
343
10.22099/ijstc.2013.1622
1622
مقاله پژوهشی
NUMERICAL ANALYSIS OF FAULT BEHAVIOR NEAR
UNDERGROUND EXCAVATIONS
In this paper, the behavior of a fault is studied using a constant strain joint model. Acombination of slider and spring is used to simulate the shear behavior of faults in the plasticregion in contrast to the previous models that have only used an elastic shear spring. Furthermore,the proposed joint element was used to study the behavior of a fault crossing a tunnel regarding therepresented shear plastic and dilation behavior of this joint element, and for this purpose a Matlabbased program called FEAFB (Finite element analysis of fault behavior) has been developed. Thecorresponding normal and shear stresses, shear strengths and the factors of safety, for differenthorizontal to vertical stress ratios and shear stiffness are analyzed and compared to the results of asimilar modeling in UDEC program. The analysis indicates that the normal and shear stresses, andthe shear strength are increased in the fault elements near the tunnel, and they are decreased in theelements becoming far from the tunnel surface. However, the safety factor can either increase ordecrease as it becomes closer to the tunnel surface, depending on the horizontal to vertical stressratio. Moreover, it is also shown that safety factor depends upon the shear stiffness, i.e., as shearstiffness increases, shear stress increases, and as a result, the safety factor decreases.
https://ijstc.shirazu.ac.ir/article_1622_66ea3c1d8b2a39b36b5db5c9d83340d5.pdf
fault
joint element
dilation
finite element
tunnel
eng
Shiraz University
Iranian Journal of Science and Technology Transactions of Civil Engineering
2228-6160
2013-08-01
37
2
345
352
10.22099/ijstc.2013.1623
1623
مقاله پژوهشی
INELASTIC DAMAGE ANALYSIS OF RCMRFS
USING PUSHOVER METHOD
The main objective of this research is to develop a practical damage criterion based onpushover analysis. For this purpose, damage analysis is performed on several Reinforced ConcreteMoment Resisting Frames (RCMRFs). In the static method, performance point of structures isfirstly determined using capacity spectrum method and then values of several different damageindices are calculated at these points. By comparing the results of two methods and evaluatingcorrelation between two sets, explicit damage relations are derived based on the static results.
https://ijstc.shirazu.ac.ir/article_1623_6fdaa72c5269a18662fa7d9e8e8e9730.pdf
Damage index
nonlinear dynamic analysis
pushover
Performance
capacity spectrum