Increased deformability can be considered as the basic disadvantage of suspension bridges. One ways to increase rigidity a bridge is transfer part stiffening girder main cable. To give more stable appearance, authors propose use cables varying bending stiffness. The made standard section shapes or have composite section. object this work was study method for analyzing and determining internal forces in under static loading provide recommendations designing bridges with stiffened cables....

One of the main problems related to design suspension bridges is stabilisation their initial form. The tendency deform generally determined by kinematical displacements cable caused asymmetrical loads rather than elastic deformations. There are some when so‐called rigid (stiff in bending) cables instead usual flexible suggested for analysis methods such with underdeveloped. For classical analytical models can be applied. However, case concentrated forces, numerical techniques preferred....

One of the most difficult issues in theory reinforced concrete (RC) is an adequate modelling deformation behaviour, cracking and, particularly, post-cracking as one major sources non-linearity. Applying concept average and strains, behaviour RC can be modelled by stress–strain tension–stiffening relationships. The authors proposed innovative inverse technique for constitutive flexural elements. based on smeared crack approach layer model section. aims at deriving models from experimental...

Stress-ribbon systems develop the most flexible and slender bridges. A structural system of such elegant bridges consists cables or ribbons deck slabs placed to these strips distribute live load. Although this is simple, design structures a challenging issue. Design limitations bridge slope induce considerable forces in ribbons, which transfer tension massive foundations. The deformation increase under concentrated asymmetrical loads causes another problem stress-ribbon bridges—the kinematic...

The paper presents a summary of numerical analysis on static behaviour suspension bridges with varying rigidity cables. primary purpose this study was to compare systems flexible and rigid cables determine the influence response bridge members under action uniformly distributed symmetrical unsymmetrical loading. finite element three-dimensional model performed. In first model, cable is modelled as TRUSS3D element, in second BEAM3D element. both models, hangers backstays are elements...

Carbon fiber-reinforced polymer (carbon-polymer) is an advanced lightweight composite material with high strength and excellent resistance to corrosion fatigue. Over the past decades, application of polymers has been spread from aerospace other branches industry such as automobile civil engineering. Unidirectional carbon-polymers have a potential for replacing steel in tensile members. Recently, first carbonpolymer stress-ribbon bridge constructed Germany. The non-laminated strip-loop...

A deformed state of parabolic shape suspension cable subjected to asymmetric loading is under consideration. The kinematic nature vertical and horizontal displacements, resulted from complementary asymmetrically distributed load are investigated, the expressions for their maximum values derived. deformability versus its curvature increment investigated. possibilities stabilise primary an examined. Numerical simulation results presented. First Published Online: 14 Oct 2010

The article dwells on a new structural solution for pedestrian steel suspension bridges. This system of stress-ribbon bridges includes members with bending stiffness and pre-stressed tie. looks into the behaviour such bridge under symmetrical asymmetrical loads; it also presents analytical expressions displacements, thrust forces moments stiff members. Then explains effect cable's tie's axial bridge's stresses as well pre-stressing horizontal vertical displacements structure. then proceeds...

The article deals with two spans steel split-type one band pedestrian suspension bridge structure. Structural behaviour of such member subjected to asymmetrical load has been discussed under the condition temporary influence imposed on span out two. Two structural solutions bridges have considered: completely flexible retaining elements, and in case bending rigid. provides analytical expressions for calculations displacements these asymmetrically loaded suspended thrust forces moments....

This paper presents a new morphology of cable-staying system for an under-deck cable-stayed bridge. The computational method proposed in the has been derived one-strut conventional cable staying and applied unconventional double-level system. describes algorithm correct implementation interaction between deck. numerical examples demonstrate that based on non-linear analysis simply supported additionally restrained beam-column can be used obtaining deformation response to considered...

The conceptions of the time-dependent reliability analysis non-deteriorating and deteriorating spun concrete bridge piers, which are effected by permanent transient loads, discussed. There analysed first- second-order load effects bracing piers. strength features resisting bending moments used in ultimate limit state probability-based designs presented. A simplified piers persistent situations probabilistic approaches is provided. prediction on shafts illustrated numerical example.

Abstract Dealing with short‐term deformations and the tension‐stiffening effect in reinforced concrete (RC), current study consists of two parts as presented separate manuscripts. Based on test data more than 300 RC ties, alternative relationships different complexity were proposed first article (Part I). In companion manuscript II), a stochastic modeling technique for assessing deformation response elements, subjected to combinations tension flexure, is proposed. principles, this allows not...

The cylindrical shell is a widely used structure in engineering practice, and its main form of failure instability due to buckling. As classical problem the field mechanics, stability shells has been studied extensively. However, large difference between theoretically predicted results critical buckling load experimental for subjected uniform axial pressure contributed continuous development theory. This paper briefly reviews theory, then presents an overview current status trends research...

Widely used telecommunication structures are usually of the tower or mast type. For medium and tall telecommunications structures, tower-type constructions become less efficient compared to mast-type structures. The goal our article is discover a new, structure. relatively low heights, systems can be designed with continuous cross-section, in most cases using reinforced concrete elements. Among them, spun elements, whose load-bearing capacity higher than that ordinary solid elements due...

The article concerns optimization of network arch bridges. This is challenging problem involving even for conventional scheme bridge the identification some topological parameters as well shape configurations and all sizing structural members, seeking minimum weight. Optimal sought tuning a large set design diverse character: type hanger arrangement, number hangers, their inclination angles placement distances, rise, etc. Mathematically, mixed-integer constrained global solved employing...

About 92% of Lithuanian bridges are made reinforced concrete. Therefore, the problem increasing reliability and service life their structures is most important for ensuring effective operation transport buildings. The main factor causing building structures’ failure associated with high water permeability low resistance to attack by corrosive media concrete used in construction. Ports, bridges, tunnels, viaducts make a group strongly attacked aggressive media, e.g. cold air, water, ice,...

Stabilization of primary shape suspension bridge is one the governing design problems structure. The form, i.e. changes steel bridge, prescribed more by kinematic vs elastic displacements. Kinematic displacements developed due to asymmetric loadings. Total can be relatively split into and components. Firstly, are determined, secondly evaluated taking account cable changed. Such a relative splitting allow an evaluating contribution both total displacement components employing efficient...

Paper is assigned to numerical analysis peculiarities of masts applying specialised computer‐aided design packages. Mast's deformable behaviour described as non‐linear one. The test problem mast solved by two widely applied in Lithuania computational packages STAADpro and Robot Millennium the programme for SUDM. A corrected analytical method guy analysis, taking into account a force component, acting along supports. performed experiment aimed clarify possibilities above‐mentioned instruments...