Search results for "Moment resisting frames"

showing 3 items of 3 documents

Retrofitting of Existing Steel MR-Frames by Encasing the Columns

2005

Summary The study concerns the behaviour of steel MR-frames subjected to vertical and lateral forces, not properly designed according to capacity design criteria, and upgraded by means of encasing the steel columns with concrete having different grade. The purpose of the paper is to examine if the proposed technique allows one to adequately increase the lateral stiffness and the resistance of the frames. Pushover analyses on multi-storey frames are performed trough a non-linear calculus program, able to take into account of the second order effects. The behaviour of frames with encased columns was compared with those of the bare frames, highlighting that with the proposed technique it is po…

Capacity designEngineeringSteel columnssteel moment resisting frames refurbischement of the columns by encasing.business.industryHingeRetrofittingLateral stiffnessLimit state designStructural engineeringDuctilitybusinessJoint (geology)IABSE Symposium, Lisbon 2005: Structures and Extreme Events
researchProduct

Shear design of high strength concrete beams in MRFs

2019

This paper presents the criteria for the shear design of high strength concrete (HSC) beams in moment resisting frames (MRFs). The formulation of an analytical model is provided for the case of beams with longitudinal reinforcement in the presence of transverse stirrups. The model is of additive type, in the meaning that the shear resistance of the beam is evaluated as the sum of several contributions. In particular, the contribution of concrete, longitudinal rebars, and transversal reinforcement are taken into account. Furthermore, for assessing the concrete contribution, a classical approach is followed, according to which two effects arise in the shear mechanism: the arc and the beam eff…

High strength concreteMaterials scienceGeography Planning and DevelopmentFlexural resistance; High strength concrete; Moment resisting frames; Shear resistance; Shear-moment domain; Building and Construction0211 other engineering and technologies020101 civil engineering02 engineering and technologyResidual0201 civil engineeringlcsh:HT165.5-169.9Flexural resistanceReinforcementShear-moment domainHigh strength concrete021110 strategic defence & security studiesbusiness.industryShear resistanceStructural engineeringMoment resisting framesBuilding and Constructionlcsh:City planningUrban StudiesTransverse planeSettore ICAR/09 - Tecnica Delle CostruzioniCompressive strengthShear resistanceShear (geology)lcsh:TA1-2040Moment resisting framelcsh:Engineering (General). Civil engineering (General)businessBeam (structure)
researchProduct

Shear models of Rc-encased steel joist beams in MRFs

2019

This study presents the application of different analytical and finite element (FE) models aimed at predicting the shear resistance of reinforced concrete (RC) and reinforced concrete-encased steel joist (HRCESJ) beams with inclined transversal reinforcement in moment resisting frames (MRFs). In particular, four analytical models are taken into account, two of them specifically conceived for HRCESJ beams in seismic area. The analytical models considered are Eurocode-2 model for the shear strength of RC beams; a variable-inclination stress-field approach; a strut-and-tie additive model and, finally, an analytical formulation in which the shear capacity depends on the number of pairs of incli…

Analytical models; Finite element models; Hybrid steel-concrete beams; Inclined stirrups; Moment resisting frames; Shear strengthInclined stirrupsShear strengthFinite element modelsInclined stirrupMoment resisting frameHybrid steel-concrete beamAnalytical modelsMoment resisting framesHybrid steel-concrete beamsAnalytical modelFinite element model
researchProduct