Assessment of the nonlinear behavior of rc moment resisting framed buildings made of structural lightweight concrete

Şenel, Mehmet Ali
Lightweight concrete does differ from normal weight concrete with the aggregate type used in the composition. Use of lightweight concrete reduces the dead weights of structures. On the contrary to general idea in Turkey, lightweight concrete has adequate performance to be used for structural purposes. The drawback of the use of lightweight concrete for structural purposes is the lack of reliable studies as performed for normal weight concrete. In the scope of this study, confinement effect of lightweight concrete has been investigated with experimentation and compared with reliable confined concrete models. The data from experimentation is used for the comparison of structural lightweight concrete and normal weight concrete buildings through the use of structural analysis program Perform-3D. The method chosen for the analysis is the nonlinear static analysis or push-over analysis. Widely accepted building codes are used in the design phase and in carrying out the chosen method of analysis, and these are ACI 318-08, ASCE 7-05, ASCE 7-10, FEMA 356 and FEMA P695. Through the use of the building codes and structural analysis program, ordinary 5 story buildings made of normal weight and lightweight concrete are analyzed and compared in 2-D modelling with pushover analysis. The outcomes obtained from study demonstrate sufficient structural performance from lightweight concrete specimens and RC framed structures, and these results are expected to ease and widen the use of lightweight concrete for structural purposes.