Behavior of RC beams subjected to high rates of concentrated loading

Cotsovos, DM; Stathopoulos, ND; Zeris, CA

dc.contributor.author	Cotsovos, DM	en
dc.contributor.author	Stathopoulos, ND	en
dc.contributor.author	Zeris, CA	en
dc.date.accessioned	2014-03-01T01:28:01Z
dc.date.available	2014-03-01T01:28:01Z
dc.date.issued	2008	en
dc.identifier.issn	0733-9445	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18663
dc.subject	Concentrated loads	en
dc.subject	Concrete beams	en
dc.subject	Reinforced concrete	en
dc.subject	Stiffness	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Engineering, Civil	en
dc.subject.other	Building materials	en
dc.subject.other	Composite beams and girders	en
dc.subject.other	Composite bridges	en
dc.subject.other	Concentration (process)	en
dc.subject.other	Concrete beams and girders	en
dc.subject.other	Concrete buildings	en
dc.subject.other	Concrete construction	en
dc.subject.other	Concrete products	en
dc.subject.other	Dynamic analysis	en
dc.subject.other	Dynamic response	en
dc.subject.other	Finite element method	en
dc.subject.other	Lead	en
dc.subject.other	Loading	en
dc.subject.other	Reinforced concrete	en
dc.subject.other	Reinforcement	en
dc.subject.other	Steel research	en
dc.subject.other	Stiffness	en
dc.subject.other	Three dimensional	en
dc.subject.other	Well testing	en
dc.subject.other	Applied loadings	en
dc.subject.other	Concentrated loadings	en
dc.subject.other	Concentrated loads	en
dc.subject.other	Concrete beams	en
dc.subject.other	Cracking patterns	en
dc.subject.other	Design models	en
dc.subject.other	Experimental observations	en
dc.subject.other	Far fields	en
dc.subject.other	Fe models	en
dc.subject.other	High loading rates	en
dc.subject.other	High rates	en
dc.subject.other	Impact loadings	en
dc.subject.other	Inelastic responses	en
dc.subject.other	Inertia forces	en
dc.subject.other	Key features	en
dc.subject.other	Load-carrying capacities	en
dc.subject.other	Loading rates	en
dc.subject.other	Material properties	en
dc.subject.other	Mechanical characteristics	en
dc.subject.other	Nonlinear statics	en
dc.subject.other	Numerical investigations	en
dc.subject.other	Numerical modeling	en
dc.subject.other	RC beams	en
dc.subject.other	Reinforced concrete beams	en
dc.subject.other	Static loadings	en
dc.subject.other	Steel reinforcements	en
dc.subject.other	Structural elements	en
dc.subject.other	Structural performances	en
dc.subject.other	Structural responses	en
dc.subject.other	Transverse loadings	en
dc.subject.other	Loads (forces)	en
dc.title	Behavior of RC beams subjected to high rates of concentrated loading	en
heal.type	journalArticle	en
heal.identifier.primary	10.1061/(ASCE)0733-9445(2008)134:12(1839)	en
heal.identifier.secondary	http://dx.doi.org/10.1061/(ASCE)0733-9445(2008)134:12(1839)	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	The work described in the present article is concerned with the numerical investigation of the dynamic response of reinforced concrete (RC) beams subjected to high rates of transverse loading. Of interest herein is the case of localized impact loading, such as that encountered in the case of contact, impact, and ballistic problems, rather than the case of loads distributed over the entire span of RC structural elements arising particularly from far field explosions. The investigation is based on the use of a commercially available general purpose finite-element (FE) package for nonlinear static and dynamic analysis of three-dimensional FE models. A key feature of our study is the hypothesis that the material properties of concrete and steel reinforcement are independent of the loading rate. Based on this assumption, the effects of the applied loading rate on the exhibited structural response are primarily attributed to the inertia forces that develop within the beam and not to the loading rate sensitivity of the mechanical characteristics of the materials involved. This hypothesis constitutes a major departure from currently accepted design and numerical modeling practices, which adopt exactly the opposite view, thus, providing an alternative explanation as to the causes that affect the complex inelastic response of RC structural elements under high loading rates, as well as the cracking patterns, observed during testing. The results obtained correlate closely with the experimental observation that structural performance, in the form of stiffness, load carrying capacity, and deformability, depart significantly from those recorded under quasi-static loading as certain thresholds of applied loading rates are surpassed, with these changes becoming more pronounced as the rate of loading increases. From the analysis of numerical and experimental predictions, the causes that lead to the above change in behavior are established and a relatively simple design model is proposed, which is able to quantify the observed increase in load-carrying capacity exhibited by RC beams with increasing rates of applied loading as well as the concentration of damage. © 2008 ASCE.	en
heal.publisher	ASCE-AMER SOC CIVIL ENGINEERS	en
heal.journalName	Journal of Structural Engineering	en
dc.identifier.doi	10.1061/(ASCE)0733-9445(2008)134:12(1839)	en
dc.identifier.isi	ISI:000260940200006	en
dc.identifier.volume	134	en
dc.identifier.issue	12	en
dc.identifier.spage	1839	en
dc.identifier.epage	1851	en