Review on Analysis of Free Vibrational Horizontally Curved Bridges

Curved I-girder concrete bridges give an outstanding answer to urban congestion, traffic, and pollution concerns, but the combined flexibility and torque responses of the bridges make their behavior exceedingly complex. That is why structural design parameters for simplified design procedures are in high demand, as measured by empirical equations. To analyze the effect on the free vibrational reaction of curve composite steel-concreteI-girder bridge with varying vibration parameters, this research employs a sensitivity analysis. To learn the fundamental frequency and the geometric configuration of the model forms, a parametric investigation is performed. Finite element Modelling of composite steel/concrete frameworks, deformable shear model, fine element formula, finite element mounting, finite element calibration, and finite element modeling, etc. Modeling finite element. Sensitivity research to draw the fundamental frequencies for the evaluated bridges. The parametric research outcomes. The results. Curved I-girder bridges of composite steel with single span or multi-span lengths are presented.

Study of Curvature Effects in Composite Steel I-Girder Bridges Using the V-Load Method

Horizontally curved composite I-girder bridges are being increasingly used for highway interchanges and river crossings. The V-load method is widely used as a simplified method for the analysis of horizontally curved I-girder highway bridges as a straight I-girder considering the effect of torsion due to curvature. Recently, North American bridge design codes and specifications have specified certain limitations to treat horizontally curved bridges as straight ones in structural analysis and design. The purpose of this study is to investigate the applicability of those specified limitations by the V-Load method, to compare the results from the V-Load method with those obtained from the finite element analysis and to develop empirical expressions for curvature limitation. The results of this study shows that the North American codes and specifications underestimate the response with their specified curvature limitations. Based on this study, a modified equation for the curvature limitation is proposed.

Study of Curvature Effects in Composite Steel I-Girder Bridges Using the V-Load Method

Horizontally curved composite I-girder bridges are being increasingly used for highway interchanges and river crossings. The V-load method is widely used as a simplified method for the analysis of horizontally curved I-girder highway bridges as a straight I-girder considering the effect of torsion due to curvature. Recently, North American bridge design codes and specifications have specified certain limitations to treat horizontally curved bridges as straight ones in structural analysis and design. The purpose of this study is to investigate the applicability of those specified limitations by the V-Load method, to compare the results from the V-Load method with those obtained from the finite element analysis and to develop empirical expressions for curvature limitation. The results of this study shows that the North American codes and specifications underestimate the response with their specified curvature limitations. Based on this study, a modified equation for the curvature limitation is proposed.

Dynamic Analysis Of Horizontally Curved Bridges

—Horizontally curved bridges are the most feasible options at complicated interchanges or river crossings where geometric restrictions and constraint of limited site space, make difficult the adoption of standard straight superstructures. Usually these bridges are of cellular cross-section so that high torsional moment can be well resisted economically. In this paper a parametric comparison was made between straight bridge and different curved bridges and skew bridges. Then these bridges were analyzed for dead, modal and moving load cases. This was done in order to study difference in the results obtained between straight, curved and skewed bridges for dead and moving load cases. The modeling part of the both bridges was done by using SAP 2000 in which there is an option named bridge wizard by which modeling of the bridge can done in a sequential order. After analyzing for dead load case unlike straight bridge there is torsion in the curved and skew bridges along the length of the bridge as there is unsymmetrical mass distribution in curved bridge about horizontal axis. Modal analysis showed the curved and skewed bridges have more initial torsional modes but whereas for straight bridge the initial modes were transverse and longitudinal. The amplifications in torsion were large compared to other parameters for curved and skewed bridges compared to straight bridge.