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About 7,783 papers for “connection angle”

Bolted Angle Steel Connection Tension Behavior

Mubarak Al- alawi, Ronald Ekyalimpa, Khalifa Al-Jabri et al. · ScienceDB · 2025

Numeric FEA and Laboratory experimental data on bolted angle steel connection tension behavior.

Cited by 0Open access

Moment Rotation behavior of Top and Seat Angle Connection with Angle Stiffeners

Navya Talla, K. Baskar · ASPS Conference Proceedings · 2022

The design specifications for seven commonly used semi-rigid steel connections have been embodied in Indian Standard Code of Practice for General Construction in Steel (IS800:2007). Bolted connections are proved to be efficient by several researchers for its energy dissipating capability under reversal of loading; among them top and seat angle (TSA) connection has higher capacity. An attempt has been made to investigate the behaviour of stiffened TSA connection by finite element analysis in this research. Previously published experimental specimens of TSA connection (RAMAN 2005) semi-rigid TSA bolted connection and their results have been considered to develop 3D Non-linear Finite Element (FE) model and analyses have been executed using the general purpose FE software. The M-?r behavior of numerical analyses are compared with that of the experimental results and thus, the FE model is validated. Further studies are carried out on TSA with all angles stiffened and TSA with angles subjected to tension alone are stiffened. The FE analysis results showed that TSA connection with only tension angles stiffened behave similar to that of TSA connection with all angles stiffened i.e., the stiffeners provided in compression angles does not contribute to the stiffness and connection capacity. The plastic flexural resistance of stiffened TSA connection has enhanced by 30% to that of TSA connection and the ratio of initial stiffness of stiffened TSA to the unstiffened TSA is found to be 1.25. So, the stiffened TSA connection is proved to be efficient in terms of both capacity and failure. The further studies have been carried out to investigate the influence of stiffener properties on the M-?r mechanism of the connection and the results showed that thickness of stiffener equal to the beam web thickness is more efficient.

Cited by 1Open access

Nonadiabatic Geometric Angle in Nuclear Magnetic Resonance Connection

O. Cherbal, Mustapha Maamache · 2012

By using the Grassmannian invariant-angle coherents states approach, the classical analogue of the Aharonov-Anandan nonadiabatic geometrical phase is found for a spin one-half in Nuclear Magnetic Resonance (NMR). In the adiabatic limit, the semi-classical relation between the adiabatic Berry’s phase and Hannay’s angle gives exactly the experimental result observed by Suter et al [12].

Cited by 0

Finsler connection preserving angle in dimensions $N\ge3$

G. S. Asanov · arXiv (Cornell University) · 2010

We show that if a Finsler space is conformally automorphic to a Riemannian space and the automorphism is positively homogeneous with respect to tangent vectors, then the indicatrix of the Finsler space is a space of constant curvature. In this case, the Finslerian two-vector angle can explicitly be found, which gives rise to simple and explicit representation for the connection preserving the angle in the indicatrix-homogeneous case. The connection is metrical and the Finsler space is obtainable from the Riemannian space by means of the parallel deformation. Since also the transitivity of covariant derivative holds, in such Finsler spaces the metrical non-linear angle-preserving connection is the respective export of the metrical linear Riemannian connection. From the commutators of covariant derivatives the associated curvature tensor is found. In case of the ${\cal FS}$-space, the explicit example of the conformally automorphic transformation can be developed, which entails the explicit connection coefficients and the metric function of the Finsleroid type.

Cited by 0Open access

Advanced Design for The Bolted Clip-Angle Connection

Wan Hu Jong, Wan Kim Jae · Advanced materials research · 2013

The main focus of this study is to investigate the clip-angle connections are described the section based on ideal limit states. The connection components are designed in accordance with the 2001 AISC-LRFD Specifications and the 2005 AISC Seismic Provisions. In the suggested clip-angle connection, the structural beam can be connected to the column using six high-strength bolts. The slippage on the shear faying surface contributes to increasing energy dissipated capacity in the connection behavior. The design of the clip-angle connection should include these mechanical characteristics. Therefore, this study presents new design methodology that can be applied to bolted clip-angle connections. Besides, step-by-step procedures for design will be treated herein.

Cited by 0

STRENGTH DETERMINATION OF HEAVY CLIP-ANGLE CONNECTION COMPONENTS

Xiaojiang Gao · OhioLink ETD Center (Ohio Library and Information Network) · 2002

From the late 1970s through the early 1990s fully welded beam-column connections were considered to be the connection of choice in moment resisting structural frames, especially in seismic regions.During the Northridge and Kobe earthquakes, however, fully welded connections suffered significant damage.Although improvements in welding methods and advancements in materials may help to improve the overall performance of welded connections, bolted connections provide an attractive alternative.The primary objective of the thesis is to provide recommendations for determination of the strength of clip angle connections.This objective were achieved by conducting an examination of the clip angle test data that was acquired during Subtask 7.03 of the SAC Research Project with regard to strength characteristics.The results of 10 component clip angle tests were presented and evaluated based on their strength characteristics.Several existing strength models are evaluated for accuracy and simple modifications were proposed.The examination included evaluations of current design procedures included in the AISC LRFD specification (1994), the Eurocode (1993), Chen, W. F. Model and Modified Kulak Model.The results are used to compare several existing strength models that govern the failure modes of including tension bolt fracture, mixed model failure and flange mechanism.assistance throughout the thesis writing.Dr. Swanson has been a model not only for his academic advantage, but also for his professionalism, wisdom, and his conduct

Cited by 9Open access

Structural Performance of Shelf Angle Connection with Innovative Detailing

Sharma, Shivam · Scholarship at UWindsor (University of Windsor) · 2021

Recent legislations are demanding more efficient thermal insulation of the building envelopes. However, most of the energy used for heating is lost through openings and small air gaps resulting from various penetrations of highly conductive elements through the building envelope. These thermal bridges can also give rise to mould growth and condensation problems. One such example is the anchoring of shelf angles to the load bearing structures, as they have to cut through the exterior insulation used to enhance the thermal performance of a building envelope. Steel through-bolts have been conventionally used by the construction industry to anchor shelf angles to a wooden frame system; however, these fasteners are uneconomical, time-consuming, and poor thermal performers, as they have to penetrate the building envelope. This research program was designed to investigate lag screws as an alternative fastener to anchor shelf angles to wooden frame structures, along with different stand-offs to further enhance the thermal performance of the building envelope. This research program comprises of both lab-based experimental work to evaluate the structural performance of these connections, and a 2-D finite element analysis of their thermal performance. The thermal analysis reveals that though-bolt connections exhibited poor thermal performance among all the connections investigated in this study. While the lag screws helped in truncating the heat flow of the thermal bridge formed in the through-bolt connection. Additionally, it was found that through-bolts had higher load capacity per fastener than lag screws since the through-bolts had a longer embedment length. It was also found that failure mode of through-bolt specimens caused them to experience more mid-span deflection and rotation. Various stand-offs with better thermal performance were also investigated. Specimens with steel C-channel stand-offs exhibited a better structural performance than the fiberglass stand-offs.

Cited by 0

Finslerian angle-preserving connection in two-dimensional case. Regular realization

G. S. Asanov · ArXiv.org · 2009

We show that the metrical connection can be introduced in the two-dimensional Finsler space such that entailed parallel transports along curves joining points of the underlying manifold keep the two-vector angle as well as the length of the tangent vector, thereby realizing isometries of tangent spaces under the parallel transports. The curvature tensor is found. In case of the Finsleroid-regular space, constructions possess the $C^{\infty}$-regular status globally regarding the dependence on tangent vectors. Many involved and important relations are explicitly derived. Keywords: Finsler metrics, angle, connection, curvature tensors

Cited by 3Open access

Connection-angle dependence of proton anisotropy in ground-level enhancement events

Alessandro Bruno, S. Dalla · ArXiv.org · 2026

Ground Level Enhancements (GLEs) probe the earliest, highest-energy solar energetic particles and thus provide a unique window onto particle release and transport from the low corona to 1 AU. We present a uniform, event-resolved analysis of the early anisotropy for ten well-observed GLEs, combining consistently reconstructed neutron-monitor pitch-angle distributions (PADs) with Parker-spiral footpoint mapping. We find a clear, monotonic decline of initial anisotropy with increasing magnetic connection angle: well-connected events exhibit strong, persistent forward-directed beams, while poorly connected events show systematically weaker and more rapidly decaying anisotropies. This relationship holds across a wide range of flare classes and CME speeds, demonstrating that magnetic connectivity and interplanetary transport, rather than eruption magnitude, dominate the directional properties of the earliest relativistic arrivals at Earth. A principal component analysis was applied to time-resolved spectral and angular parameters to separate source-driven changes from transport effects. By explicitly identifying and removing secondary sunward (back-scattered) components-attributable to scattering and reflection from solar-wind structures and transient interplanetary features-from the PAD fits, we isolate the intrinsic relaxation of the primary forward beam and show that apparent departures from simple exponential decay are frequently attributable to reflected or delayed populations rather than prolonged source injection. The empirical anisotropy--connection-angle relation reported here provides an event-resolved, quantitative benchmark that constrains focused-transport and shock-acceleration models and offers immediate operational value: rapid footpoint estimates can meaningfully limit expected initial beaming and directional radiation risk.

Cited by 0Open access

Connection-angle dependence of proton anisotropy in ground-level enhancement events

Alessandro Bruno, S. Dalla · Astronomy and Astrophysics · 2026

Ground-level enhancements (GLEs) probe the earliest, highest-energy solar energetic particles and thus provide a unique window into particle release and transport from the low corona to 1 AU. We present a uniform, event-resolved analysis of the early anisotropy for ten well-observed GLEs, combining consistently reconstructed neutron-monitor pitch-angle distributions (PADs) with Parker-spiral footpoint mapping. We find a clear, monotonic decline in initial anisotropy with increasing magnetic connection angle: well-connected events exhibit strong, persistent forward-directed beams, while poorly connected events show systematically weaker and more rapidly decaying anisotropies. This relationship holds across a wide range of flare classes and coronal mass ejection (CME) speeds, demonstrating that magnetic connectivity and interplanetary transport, rather than eruption magnitude, dominate the directional properties of the earliest relativistic arrivals at Earth. A principal component analysis was applied to time-resolved spectral and angular parameters to separate source-driven changes from transport effects. By explicitly identifying and removing secondary sunward (back-scattered) components—attributable to scattering and reflection from solar-wind structures and transient interplanetary features—from the PAD fits, we isolated the intrinsic relaxation of the primary forward beam and show that apparent departures from simple exponential decay are frequently attributable to reflected or delayed populations rather than prolonged source injection. The empirical anisotropy--connection-angle relation reported here provides an event-resolved, quantitative benchmark that constrains focused-transport and shock-acceleration models and offers immediate operational value: rapid footpoint estimates can meaningfully limit expected initial beaming and directional radiation risk.

Cited by 0Open access

Connection-angle dependence of proton anisotropy in ground-level enhancement events

Alessandro Bruno, S. Dalla · arXiv (Cornell University) · 2026

Ground Level Enhancements (GLEs) probe the earliest, highest-energy solar energetic particles and thus provide a unique window onto particle release and transport from the low corona to 1 AU. We present a uniform, event-resolved analysis of the early anisotropy for ten well-observed GLEs, combining consistently reconstructed neutron-monitor pitch-angle distributions (PADs) with Parker-spiral footpoint mapping. We find a clear, monotonic decline of initial anisotropy with increasing magnetic connection angle: well-connected events exhibit strong, persistent forward-directed beams, while poorly connected events show systematically weaker and more rapidly decaying anisotropies. This relationship holds across a wide range of flare classes and CME speeds, demonstrating that magnetic connectivity and interplanetary transport, rather than eruption magnitude, dominate the directional properties of the earliest relativistic arrivals at Earth. A principal component analysis was applied to time-resolved spectral and angular parameters to separate source-driven changes from transport effects. By explicitly identifying and removing secondary sunward (back-scattered) components-attributable to scattering and reflection from solar-wind structures and transient interplanetary features-from the PAD fits, we isolate the intrinsic relaxation of the primary forward beam and show that apparent departures from simple exponential decay are frequently attributable to reflected or delayed populations rather than prolonged source injection. The empirical anisotropy--connection-angle relation reported here provides an event-resolved, quantitative benchmark that constrains focused-transport and shock-acceleration models and offers immediate operational value: rapid footpoint estimates can meaningfully limit expected initial beaming and directional radiation risk.

Cited by 0Open access

Numerical investigation of semi-rigid beam-to-column bolted angle connection

Ahmed Ajel Ali · Pollack Periodica · 2025

Abstract The three-dimensional finite element model was developed to analyze semi-rigid beam-to-column connections, considering factors like bolt pretension and the contact between various surfaces. Experimental data validates the model, revealing strong correlations in load displacement and moment rotation characteristics. A parametric study involving seventy-five models explores the influence of various geometric parameters, particularly beam size, on connection performance. The main results show that for the same beam size, increasing the thickness of the flange angle makes it stronger against moments but less able to rotate. On the other hand, larger flange gages make the initial stiffness lower and the final rotation higher. Additionally, thicker web angles improve ultimate moment capacity but also limit rotation.

Cited by 0Open access