Limited studies have investigated the progressive collapse of three-dimensional (3D) semirigid steel–concrete frames due to complexity modeling techniques, intensive computational time involved in analysis, and lack experimental work. A simplified numerical model was developed using nonlinear dynamic analysis procedures. Single column removal cases were considered different story levels at various locations. Results three types connections—double web angle (DWA), top seat with double (TSD),...

This paper investigated the behavior of three-dimensional (3D) steel-concrete building under external explosion considering slab and connection rigidity. Most work carried out so far in progressive collapse area followed threat-independent alternate load path (ALP) methodology as a design guide. study presents simplified two-stage nonlinear dynamic analysis using Abaqus FE. The number columns likely to be removed due blast is determined three-step restart first stage. Collapse entire second...

A novel method to improve the robustness of steel end plate connections is presented in this paper. Existing commonly adopted techniques alter stiffness beam or connection’s robustness. In study, enhanced by improving contribution bolts rotational capacity connections; higher bolts’ elongation, that can be achieved. However, brittleness bolt material, combined with its small length, results negligible elongation. Alternatively, load path between and interrupted a ductile element achieve...

Abstract Proper mission control plays a key role in the lifetime of space operation, as it ensures that all resources are efficiently utilized when achieving goals. Ground station operation mainly depends on received telemetry together with models simulating spacecraft`s subsystems. Created help raising level autonomy MCC (Mission Control Center). Data driven describe actual state subsystem real situations rather than theoretical costly physical models. This paper proposes data for satellite...

Background: Spondylolysthesis represents a particular and relatively frequent mechanism of intervertebral instability.It could cause low back pain due to forward or anterior displacement one vertebra in relation the adjacent lower vertebra.There are many treatment interventions.However, there was no consensus on ideal approach. Aim work:To assess outcome trans-pedicular screw fixation with posterior inter-body fusion management lumber lumbosacral spondylolysthesis.Patients Methods: This is...

Background Treatment of Behcet disease (BD) associating oral ulcers is still challenging despite the advances in systemic treatment modalities. Objectives We aimed to evaluate clinical efficacy topical Tacrolimus for BD. Methods In this double blind placebo controlled trial, forty BD patients with persistent active ulceration were equally randomized into group I (20 received colchicine plus topically applied tacrolimus) and II gel). All participants evaluated based on Behcet’s Disease...

In this paper, studies on braced frames are presented to study their behavior under the influence of seismic loads.Steel frame systems considered an efficient and economical technique resist horizontal maintain lateral deformation buildings effect wind loads.Among these studies, a was conducted at University California -Berkeley, America, in 2012-2013 by Lai Mahin.This laboratory tests for three full-scale one-bay two-story with different cross sections braces such as square-HSS,...

the work in progressive collapse of three-dimensional composite buildings quite limited due to cost and difficulties full-scale experimental tests complexity modelling technique.Researchers design engineers are following The Alternative Load Path method (ALP) recommended by GSA DoD guidelines mitigate potential.The commonly used ALP method, which considers as a threat-independent methodology, taking into account single column removal scenarios only regardless threat load type.This paper...