Title:
Resistance Model of Lightweight Concrete Members
Author(s):
Anna M. Rakoczy and Andrzej S. Nowak
Publication:
Materials Journal
Volume:
110
Issue:
1
Appears on pages(s):
99-108
Keywords:
beam; bias factor; coefficient of variation; cumulative distribution function; lightweight concrete; reinforced concrete; slab.
DOI:
10.14359/51684370
Date:
1/1/2013
Abstract:
The objective of this study is to develop a resistance model for lightweight concrete (LWC) beams and slabs and compare it with normalweight concrete (NWC) beams and slabs using new material and component test data. The focus is on the development of statistical parameters for bending moment capacity and shear capacity. Resistance parameters can then serve as a basis for the determination of rational resistance factors for LWC. Loadcarrying capacity (resistance) is considered a product of three random variables representing the uncertainty in material properties, dimensions, and geometry (fabrication factor) and analytical model (professional factor). In general, it was observed that the compressive strength of LWC is similar to that of NWC and, in some cases, is even better. However, the lab tests of beams and slabs show that the current shear design procedure is less conservative for LWC compared to NWC. Therefore, the resistance factor for LWC has to be revised.