Numerical Study on Post-Fracture Redundancy of the Two-girder Steel-Concrete Composite Highway Bridges

Weiwei Lin,Teruhiko Yoda,Yoji Kumagai,Takeshi Saigyo 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.4

As the Japan bridge inventory ages and traffic volumes increase, the government is spending more on maintaining theirexisting structures to extend the service life of the current bridge inventory. This includes two-girder bridges that are classifiedas fracture critical and non-redundant. Owing to the increased inspection costs associated with these fracture-critical bridges,there is a need to evaluate alternate load paths and to implement retrofit methods on existing bridge structures to avoid bridgereplacement. In this paper, fracture redundancy of the two-girder bridge is investigated through a case study for a three-spancontinuous twin I-girder bridge. The finite element analysis is carried out to evaluate the load-carrying capacity after fractureof a girder of the two-girder bridge. Damage of studs near the moment contra-flexure regions are also considered in this study. Spacing between the transverse beams is discussed as possible techniques to improve redundancy and reduce the fracturepotential of two-girder bridge structures. The concrete slab is indicated to be a significant member for guarantying theredundancy of the two-girder steel-concrete composite bridges.

Study on Failure modes of Steel Truss Bridge Gusset Plates Related to Tension and Shear Block Failure

Hideyuki Kasano,Teruhiko Yoda,Kuniei Nogami,Jun Murakoshi,Naoki Toyama,Mamoru Sawada,Kentaro Arimura,Lu Guo 한국강구조학회 2012 International Journal of Steel Structures Vol.12 No.3

Tension and shear block failure is a limit state which occurs in the connection of tension steel members. The failure mechanism is a combination of tensile failure on one plane and shear failure on the perpendicular plane. The design strength equations for the tension and shear block failure are described in the well known design codes. However, they provide inconsistent levels of safety when they are used in different types of connections. In this paper, the authors survey the design strength equations in the various codes. Then, the pertinent strength equations for the gusset plates of steel truss bridges are selected. Moreover, the authors propose a pair of strength equations for compression and shear block failure for gusset plates subjected to compressive force. And to examine the applicability of proposed equations and to investigate the mechanical behavior of compression gusset plates, parametric analyses on the various thicknesses of gusset plates were conducted.

Numerical Study on Horizontally Curved Steel-Concrete Composite Beams Subjected to Hogging Moment

Weiwei Lin,Teruhiko Yoda 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.3

The horizontally curved continuous composite steel-concrete beams, for instance, curved continuous composite bridges, haveexcellent qualities, such as quick construction, good seismic performance, saving construction formwork and convenience inspatial arrangement etc. At present, the application research of this kind of structures is becoming more of a concern, but veryfew studies have been conducted to study the mechanical performance of composite beams subjected to combined hogging(negative) bending and torsion. The purpose of the present study is to investigate the effects of curvatures on both elastic andinelastic behaviours of curved continuous steel-concrete composite beams in the interior support regions. Based on theexperimental observations in a straight composite beam, a three-dimensional FE model capable of analysing the compositebeams subjected to negative bending moment is built. Further numerical studies on curved composite beams with differentcurvatures are performed in this study. Strength and load carrying capacity, sectional strain distribution and movement ofcomposite neutral axis before and after cracking, as well as the strain results of longitudinal reinforcing bars are investigated. Besides, the interaction equation for ultimate bending and torsional moments is proposed.

Experimental and Numerical Study on Cyclic Behaviour of Steel Beam-to-Column Joints

Jun He,Teruhiko Yoda,Hideaki Takaku,Yuqing Liu,Airong Chen,Masashi Iura 한국강구조학회 2010 International Journal of Steel Structures Vol.10 No.2

Ten specimens are tested to investigate the cyclic behavior of beam-to-column joints of steel frames with joint panels. The performances of the joints with respect to strength, rigidity, and hysteretic performance are examined. Three different loadcarrying mechanisms can be identified. Panel resistance ratio (R p) is presented for predicting the buckling patterns. The validity of R p is confirmed through the present experimental results. On the basis of the experimental results of steel beam-to-column moment joints, 3-D nonlinear finite element models are established to analyze the mechanical properties of these connections. The load-displacement curves of the finite element analysis are in good agreement with those of the tests in terms of strength and unloading stiffness. A shear lag phenomenon was captured in the beam flanges by not only experimental results but also numerical analysis. Parametric studies are conducted on the connections under monotonic loading to investigate the influences of connection dimension, resistance ratio on the connection behavior. It was found that the failure modes are influenced by the resistance ratio, while the thickness of joint panels resulting in large effects on the strength and stiffness under shear failure mode.

Analysis, Design and Construction of Curved Composite Girder Bridges: State-of-the-Art

Weiwei Lin,Teruhiko Yoda 한국강구조학회 2010 International Journal of Steel Structures Vol.10 No.3

The horizontally curved composite girder bridges have excellent properties, such as quick construction, good seismic performance, saving construction formwork and convenience in spatial arrangement.etc, which have greatly promoted the application of such bridges. The objective of this paper is to provide and summarize important references related to the analysis,design and construction of curved composite girder bridges. Subjects discussed in this review include (1) different curved girder bridge configurations and their applied range; (2) current specifications; (3) construction issues; (4) design methods; (5) analytical methods; (6) load distribution; (7) torsional behavior; (8) warping stresses; (9) stability; (10) ultimate load-carrying capacity; (11)dynamic and seismic response; (12) loading test; (13) long-term behavior; and (14) design details. The literature survey presented herein mainly focuses on papers written in English, Japanese and Chinese in relation to curved composite girders.

Effects of Inclination Angle on Buckling of Continuous Composite Bridges with Inclined Parabolic Arch Ribs

Chengzhong Gui,Junqing Lei,Teruhiko Yoda,Weiwei Lin,Yongshui Zhang 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.2

The effects of the inclination angle on the buckling of continuous composite bridges (CCBs) with parabolic arch ribs remain to be elucidated. Static tests were conducted on an on-site prototype of a CCB with parallel arch ribs to verify the validity of proposed numerical finite element method models of CCBs with inward and outward arch ribs. We found that the expressions for the equivalent slenderness ratios and buckling coefficients should consider the interactions between the in-plane and outof- plane buckling, given the inclination of the arch ribs. With respect to the buckling modes, the arch ribs of all the models buckled in the first lateral mode. In addition, two types of interactions were observed between the buckling modes, namely, that between in-plane and out-of-plane buckling and that between global and local buckling; these were affected by the inclination angle, especially in the case of the CCB with the outward arch ribs.

Shear behavior and analytical model of perfobond connectors

Shuangjie Zheng,Yuqing Liu,Teruhiko Yoda,Weiwei Lin 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.1

In steel and concrete composite girders, the load transfer between the steel beam and the concrete slab is commonly ensured by installing shear connectors. In this paper, to investigate the nonlinear behavior of perfobond connectors, a total of 60 push-out specimens were fabricated and tested with the variables for the hole diameter, the concrete strength, the thickness of concrete slab, the diameter, strength and existence of perforating rebar, the thickness, height and distance of perfobond ribs. The failure mode and the load-slip behavior of perfobond connectors were obtained. A theoretical model was put forward to express the load-slip relationship. Analytical formulas of shear capacity and peak slip were also proposed considering the interaction between the concrete dowel and the perforating rebar. The calculation results of the proposals agreed well with the experimental values.

Mechanical Behavior and Analysis of Composite Bridges with Corrugated Steel Webs: State-of-the-Art

Jun He,Yuqing Liu,Airong Chen,Teruhiko Yoda 한국강구조학회 2012 International Journal of Steel Structures Vol.12 No.3

The composite bridges with corrugated steel webs have excellent properties, such as lightness of girders, efficiency of introducing prestress forces, short construction period, optimum force distribution, good seismic performance, and aesthetics appearance etc., which have greatly promoted the application of such bridges. The objective of this paper is to provide and summarize important references related to the analysis, design and construction of composite bridges with corrugated steel webs. Subjects discussed in this review include (1) structural configuration and application; (2) shear behavior; (3) bending behavior; (4) torsional behavior; (5) patch loading resistance; (6) dynamic behavior; (7) long-term behaviors including fatigue and creep; (8) component connections; (9) analysis method and theory; (10) new concept application. The literature survey presented herein mainly focuses on papers written in English, Japanese, German and Chinese in relation to composite bridges with corrugated steel webs.