Generalized force vectors for multi-mode pushover analysis of bridges

Perdomo, Camilo
Monteiro, Ricardo
Sucuoğlu, Haluk
Nonlinear static procedures (NSPs) are gaining wider use in performance based earthquake engineering practice due to their simplicity compared to rigorous nonlinear time history analysis (NTHA), and being implemented in the new generation of seismic design codes. In this study, a recently proposed Nonlinear Static Procedure (NSP) for the seismic performance assessment of building structures using the concept of generalized force vectors (GFV), is further validated through application to reinforced concrete bridges. This method, named generalized pushover analysis (GPA), maximizes the response of a chosen parameter during the seismic response, through the use of the GFV, which are a combination of modal forces representing the instantaneous force acting on the system when such parameter reaches its maximum. In this study, the original GPA implemented in buildings is adapted to bridge structures and four versions of the algorithm are tested. Two straight bridges, featuring different levels of vertical irregularity, are used as case study to validate the procedure, and the accuracy of the GPA algorithm is assessed by comparing the nonlinear static results with the "exact" prediction from NTHA. Several levels of seismic hazard, represented in the expected return period of the target spectra, are considered to test the accuracy of the method for low and high seismic demand. Furthermore, the GPA results are also compared with a commonly employed NSP, the capacity spectrum method. The results obtained for the case study suggest that GPA algorithm for bridges is suitable as a NSP approach for the seismic assessment of bridge structures, demonstrating a good fit with NTHA results and superiority with respect to the predictions of the selected traditional NSP.


Generalized Pushover Analysis For Torsionally Coupled Systems
Kaatsız, Kaan; Alıcı, Fırat Soner; Sucuoğlu, Haluk (2017-01-13)
Generalized pushover analysis procedure that was previously formulated on 2D planar frames is extended to 3D systems with torsional coupling in the presented study. The instantaneous force distribution acting on the system when the interstory drift at a story reaches its maximum value during seismic response is defined as the generalized force distribution. This force distribution is then expressed in terms of combinations of modal forces. Modal contributions to the generalized force vectors are calculated ...
Generalized force vectors for multi-mode pushover analysis of torsionally coupled systems
Kaatsız, Kaan; Sucuoğlu, Haluk (Wiley, 2014-10-25)
A generalized multi-mode pushover analysis procedure was developed for estimating the maximum inelastic seismic response of symmetrical plan structures under earthquake ground excitations. Pushover analyses are conducted with story-specific generalized force vectors in this procedure, with contributions from all effective modes. Generalized pushover analysis procedure is extended to three-dimensional torsionally coupled systems in the presented study. Generalized force distributions are expressed as the com...
Generalized force vectors for multi-mode pushover analysis
Sucuoğlu, Haluk (Wiley, 2011-01-01)
A generalized pushover analysis (GPA) procedure is developed for estimating the inelastic seismic response of structures under earthquake ground excitations. The procedure comprises applying different generalized force vectors separately to the structure in an incremental form with increasing amplitude until a prescribed seismic demand is attained for each generalized force vector. A generalized force vector is expressed as a combination of modal forces, and simulates the instantaneous force distribution ac...
An Investigation of seismic face stability of deep tunnels by using an axisymmetric finite element model
Hadley, Hannah Elizabeth; Sucuoğlu, Haluk; Yılmaz, Mustafa Tolga; Department of Civil Engineering (2018)
The static stability of tunnel faces has been widely studied, with the development of limit analysis and numerical modelling solutions. There has been limited research into seismic tunnel face stability. The aim of this study is to find the effect of seismic loading on tunnel face stability and suggest factors that could be used in design. A numerical model using the axisymmetric finite element method is developed to assess tunnel face stability under seismic loading. To verify the numerical analysis, it wa...
On efficient use of simulated annealing in complex structural optimization problems
Hasançebi, Oğuzhan (Springer Science and Business Media LLC, 2002-01-01)
The paper is concerned with the efficient use of simulated annealing (SA) in structural optimization problems of high complexity. A reformulation of the working mechanism of the Boltzmann parameter is introduced to accelerate and enhance the general productivity of SA in terms of convergence reliability. Two general and complementary parameters, referred as "weighted Boltzmann parameter" and "critical Boltzmann parameter," are proposed, Several alternative methodologies are suggested for these two parameter...
Citation Formats
C. Perdomo, R. Monteiro, and H. Sucuoğlu, “Generalized force vectors for multi-mode pushover analysis of bridges,” BULLETIN OF EARTHQUAKE ENGINEERING, pp. 5247–5280, 2017, Accessed: 00, 2020. [Online]. Available: