Mark D. Denavit

Mark D. Denavit
Stanley D. Lindsey and Associates, Ltd.

PhD

About

28
Publications
7,248
Reads
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363
Citations

Publications

Publications (28)
Article
The structural performance of square concrete-filled steel tubular (SCFST) columns can be improved by stiffening the tube. Stiffening delays local buckling and can improve composite action while also facilitates the use of thinner and higher-strength materials. A particularly efficient form of stiffened SCFST column using diagonal binding ribs was...
Article
Composite floor systems rely on shear connection, commonly using headed steel stud anchors, to ensure that the steel beam and concrete slab work together as a unit, but also to transfer load from the diaphragm to the lateral force-resisting system. Under cyclic loading, slip and degradation can occur at the shear connection, affecting the seismic r...
Article
The use of elastic analysis is prevalent in the design of building structures even under loading conditions where inelasticity would be expected. Accordingly, geometric and material properties used in the elastic analyses must be carefully selected to maintain accuracy. Steel-concrete composite columns experience different forms of inelasticity. Co...
Conference Paper
Calibrated results of the elastic flexural rigidity (EI_elastic) for the determination of the fundamental period of a building with encased composite columns, also known as Steel Reinforced Concrete (SRC) columns, are discussed in this paper. This calibration is carried out from the natural frequencies measured from an ambient vibration test and fr...
Article
Steel-concrete composite moment frames have been shown to be an effective alternative for use as the primary seismic force-resisting system of building structures. However, little data are available to justify the structural system performance factors (i.e., R, Cd, and Ωo) given in codes to characterize the overstrength and ductility of these syste...
Conference Paper
This paper describes the methodology for post-processing experimental data related to the axial strength of slender full-scale concrete-filled tubes. Although utilizing a state-of-the-art testing system, the results obtained during testing needed to be corrected to account for the compliance, frictional forces, resolution and capacity limits of the...
Article
The direct analysis method is the primary means of assessing system stability within a standard specification. This method, and in particular its use of reduced stiffness, has been thoroughly validated for use in frames consisting of structural steel members. However, appropriate stiffness reductions have not yet been established nor has the method...
Conference Paper
This paper will focus on aspects of the advanced analysis and underlying behavior of composite structures with concrete-filled steel tube (CFT) columns. Through a detailed examination of the results of a suite of full-scale slender CFT beam-column tests, insight into the cyclic behavior of such members is gained, specifically pertaining to local bu...
Article
This paper presents selected results from an experimental and computational evaluation on the behavior of slender concrete-filled steel tubes (CFTs) under combined axial compression and biaxial flexure. A complex loading protocol was used in the experimental program, including monotonic and cyclic loading that allowed detailed evaluation of the com...
Conference Paper
The lack of clear guidance regarding the value of elastic flexural rigidity (EI) that should be used in the analysis of steel-concrete composite columns is a significant unresolved issue that hinders the design of frame systems that include these members. The common approach of utilizing the rigidity of either the steel or the concrete only tends t...
Article
Composite steel-concrete columns and beam-columns have been shown to provide superior performance when the intrinsic syn-ergistic characteristics of concrete and steel are properly exploited. However, limited test data are available to justify the structural system re-sponse factors and comprehensive design equations in current design specification...
Conference Paper
Full-text available
In United States design practice, three system performance factors (R, C d , and Ω o) characterize the inelastic behavior of structures and are a crucial component of common elastic design methodologies. However, for steel-concrete composite frame systems these factors have been selected based on comparisons to more traditional and well-studied rei...
Article
Accurate nonlinear formulations are necessary for the assessment of structures under seismic and other extreme loading. In this work, a three-dimensional distributed plasticity beam element formulation for circular concrete-filled steel tubes has been developed for nonlinear static and dynamic analyses of composite seismic force resisting systems....
Conference Paper
This paper presents new strategies for the design of braced and unbraced frame structures that include concrete-filled steel tubes or steel reinforced concrete beam-columns as part of the seismic force resisting system. The paper first highlights experimental tests conducted on concrete-filled steel tube beam-columns subjected to cyclic biaxial ben...
Article
Full-text available
This paper investigates the use of the Direct Analysis method, established within the AISC Specification for Structural Steel Buildings, for steel-concrete composite beam-columns, including both concrete-filled steel tube and steel reinforced concrete members. In addition, the paper outlines recommendations for equivalent flexural rigidity to be us...
Chapter
Full-text available
This paper describes historical efforts to synthesize available experimental data on composite columns, including both steel reinforced concrete (SRC) and concrete-filled steel tube (CFT) specimens. The latest version of this database has about 1387 circular CFTs (912 columns and 475 beam-columns), 826 rectangular CFTs (524 columns and 302 beam-col...
Conference Paper
The ability to perform accurate nonlinear simulations is a key component in the assessment of the behavior of seismic force resisting systems. A three-dimensional distributed plasticity formulation for composite beam-columns suitable for nonlinear static and dynamic analyses of composite seismic force resisting systems has been developed. New uniax...
Article
This paper reports the results of sixteen experiments of bolted slip-critical connections with fillers. Fifteen of the connections used oversized holes and one connection used standard holes. Such connections with oversized holes are commonly fabricated for use with structures such as long-span trusses, since the use of oversized holes allows erect...
Article
Research has been conducted to better understand the effect of fillers in bolted steel connections. In a companion paper, the results of sixteen experiments on bolted steel slip-critical connections with fillers are presented along with proposed design recommendations. In this paper, detailed behavior of the specimens is documented through an exami...
Article
A significant amount of research has been conducted worldwide on the behavior of concrete filled steel tubes (CFTs) in the past five decades. This report provides a summary of the behavior and experimental work of concrete filled steel tube members, connections, and frames that are reported in detail in the literature. These published studies have...
Conference Paper
Full-text available
The assessment of response of composite seismic force resisting systems requires accurate nonlinear formulations for the composite members. In this work, reporting the first phase of a NEES project, a three-dimensional distributed plasticity formulation is presented for both circular and rectangular composite concrete-filled steel tubes (CFTs) that...
Conference Paper
Full-text available
This paper presents selected experimental results on 18 tests on circular and rectangular concrete-filled steel tubes (CFT) subjected to cyclic loads. The selected test matrix in this experimental study is unique for the size and slenderness of the specimens, which fill gaps found in the available experimental CFT databases. Different steel tube sh...
Conference Paper
Full-text available
This paper briefly describes efforts at determining buckling loads of slender concrete-filled tube beam-columns. Although utilizing state-of-the-art equipment and controllers, unexpected difficulties were encountered on extracting buckling loads for the specimens due to (a) frictional forces in the actuators, (b) large initial bidirectional imperfe...
Article
Full-text available
The paper contrasts results obtained by the traditional First Order Reliability Method (FORM) and a more advanced Random Finite Element Method (RFEM) in a benchmark problem of slope stability analysis with random shear strength parameters. The key difference between the methods is that RFEM takes into account spatial correlation in a rigorous way a...
Article
Full-text available
This paper summarizes ongoing research and trends in practice for both practical and innovative steel and composite steel-concrete structural systems. Selected recent work in the United States will be reviewed and trends in the design specifications will be identified, including new tests and analyses on composite steel/concrete systems aimed at im...
Article
This document reports the results of sixteen experiments of bolted slip-critical connections with fillers. Fifteen of the connections used oversized holes and one connection used standard holes to establish a baseline comparison. Such connections with oversized holes are commonly fabricated for use with structures such as long-span trusses, since t...

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Project (1)
Archived project
Facilitate the use of composite systems in buildings between 5 and 20 stories and in areas of low, moderate, and high seismicity. Provide updated design formulas and practical guidelines for the analysis and design of composite structures. Develop system performance factors (e.g., R, Cd, and Ωo) for composite braced and unbraced structural systems. Substantially upgrade the computational models available for analyzing complete composite systems and provide detailed documentation to help researchers pursue similar studies.