Abstract
In order to exploit the potentials in mechanical and constructional performance of steel reinforced concrete structures and prefabricated structures, three innovative kinds of partially precast steel reinforced concrete beams, which are abbreviated here as PPSRC, HPSRC and PPCSRC beam, are presented in this paper. The PPSRC beam is composed of two parts, which are the precast outer shell with high-performance concrete and the cast-in-place inner part with common-strength concrete. Meanwhile, on the basis of PPSRC beam, the PPCSRC beam applies castellated steel shape and the HPSRC beam keeps the beam core hollow. With the aim to investigate the mechanical behavior, failure mode and bearing capacity of the PPSRC, PPCSRC and HPSRC beams, a static loading experiment with twenty four specimens was carried out. The effects of aspect ratio, construction method, section shape, concrete flange and strength of concrete were critically examined. Test results indicate that the HPSRC, PPCSRC and PPSRC beams both exhibit similar mechanical performance and bonding performance. The flexural capacity and shear capacity are seldom affected by the construction method and section shape, and increase with the increasing of the cast-in-place concrete strength. The shear strength of the specimens is significantly affected by the concrete flange and aspect ratio.
Highlights
Steel reinforced concrete (SRC) structures have been widely applied in large-span or highrise structures due to some favorable characteristics, such as high bearing capacity, great stiffness and outstanding ductility performance [1]
The test results indicated that the partially precast steel reinforced concrete (PPSRC) and hollow partially precast steel reinforced concrete (HPSRC) beams both failed in similar failure modes to the cast-in-place SRC beam
For the PPSRC specimens under sagging moment, the concrete flange was in the compression zone, and longitudinal cracks were observed during the test, which indicated that the stress transfer mechanism might be changed due to the concrete flange
Summary
Steel reinforced concrete (SRC) structures have been widely applied in large-span or highrise structures due to some favorable characteristics, such as high bearing capacity, great stiffness and outstanding ductility performance [1]. Hong et al [4,5,6,7,8] created an innovative partially precast SRC structure system, MHS (modularized hybrid system), and conducted cyclic tests of partially precast steel reinforced concrete (PPSRC) beams. The test results indicated that this PPSRC beam exhibited outstanding mechanical performance, but the structural measures which enhance the bonding performance between the precast concrete, cast-in-place concrete and steel shape should be further optimized. In PPSRC beams, the outer U-shaped shell, which is composed of steel shape, high-strength concrete, longitudinal and transverse rebar, is prefabricated in work shop, and the inner part could be cast on construction site. The high-strength precast outer part with higher capacity and stiffness could enhance the mechanical performance during the construction period, and the diaphragms could serve as shear connectors to enhance the bonding performance between the precast and cast-in-place concrete. The effects of the construction method, section shape and compressive strength of concrete are critically examined
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