Finite element modelling of concrete-filled steel stub columns under axial compression

Finite element analysis of punching shear of concrete slabs using damaged plasticity model in ABAQUS

This paper discusses the properties of RCA, the effects of RCA use on concrete material properties, and the large scale impact of RCA on structural members. The review study yielded the following findings in regards to concrete material properties: (1) replacing NA in concrete with RCA decreases the compressive strength, but yields comparable splitting tensile strength; (2) the modulus of rupture for RCA concrete was slightly less than that of conventional concrete, likely due to the weakened the interfacial transition zone from residual mortar; and (3) the modulus of elasticity is also lower than expected, caused by the more ductile aggregate. As far as the structural performance is concerned, beams with RCA did experience greater midspan deflections under a service load and smaller cracking moments. However, structural beams did not seem to be as affected by RCA content as materials tests. Most of all, the ultimate moment was moderately affected by RCA content. All in all, it is confirmed that the use of RCA is likely a viable option for structural use.

https://link.springer.com/content/pdf/10.1007%2Fs40069-013-0032-5.pdf

Recycled Concrete Aggregates: A Review

Workability and mechanical properties of alkali-activated fly ash-slag concrete cured at ambient temperature

Significance of residual drifts in building earthquake loss estimation

The “Building Code Requirements for Structural Concrete” (“Code”) covers the materials, design, and construction of structural concrete used in buildings and where applicable in nonbuilding structures. The Code also covers the strength evaluation of existing concrete structures. Among the subjects covered are: contract documents; inspection; materials; durability requirements; concrete quality, mixing, and placing; formwork; embedded pipes; construction joints; reinforcement details; analysis and design; strength and serviceability; flexural and axial loads; shear and torsion; development and splices of reinforcement; slab systems; walls; footings; precast concrete; composite flexural members; prestressed concrete; shells and folded plate members; strength evaluation of existing structures; provisions for seismic design; structural plain concrete; strut-and-tie modeling in Appendix A; alternative design provisions in Appendix B; alternative load and strength reduction factors in Appendix C; and anchoring to concrete in Appendix D. The quality and testing of materials used in construction are covered by reference to the appropriate ASTM standard specifications. Welding of reinforcement is covered by reference to the appropriate American Welding Society (AWS) standard. Uses of the Code include adoption by reference in general building codes, and earlier editions have been widely used in this manner. The Code is written in a format that allows such reference without change to its language. Therefore, background details or suggestions for carrying out the requirements or intent of the Code portion cannot be included. The Commentary is provided for this purpose. Some of the considerations of the committee in developing the Code portion are discussed within the Commentary, with emphasis given to the explanation of new or revised provisions. Much of the research data referenced in preparing the Code is cited for the user desiring to study individual questions in greater detail. Other documents that provide suggestions for carrying out the requirements of the Code are also cited.

"building code requirements for structural concrete (aci 318-11) and commentary"

This case study focuses on excessive and undesired deformations that occurred during construction of newly rehabilitated steel bridges. The case study responds to problems with elevation control and subsequent ride quality problems exhibited in newly constructed or newly rehabilitated steel girder bridges made composite with concrete decks cast atop steel girders. Forensic investigations were performed on three bridges that had been in service for only a few years. These investigations discovered strong evidence that cantilevered portions of concrete decks were not supported adequately during construction loadings. The purpose of the case study is to identify causes for undesirable elevation profiles, and to recommend design and construction practices to help mitigate problems created for the highway users and extend the useful life of bridges. 

Bruce W. Russell

Papers

"building code requirements for structural concrete (aci 318-11) and commentary"

Investigation of Poor Ride Quality in Steel-Bridge Girders Made Composite with Concrete Decks