Study On Mechanical Behavior Of Steel-Concrete Sastellated Composite Beams

The steel-concrete satellated composite beam is a new type of steel-concrete composite structure form, It has been applied in engineering practice. Current stage, the research of the composite beams at home and abroad is still scarce, severely limits the steel-concrete satellated composite beam in engineering application and promotion. Therefore, this new type of composite beam under vertical static load stress performance has become an urgent research subject.This article made9steel-concrete satellated composite beams and1steel-concrete satellated composite beam, and has carried on the research on static test of vertical load, verify the feasibility of the model of ABAQUS and choose three factors to analyze. The main research contents:①study the structure of the new type of beam under vertical static stress, the law of the development of typical orifice stress distribution and failure mechanism of the section, and reveal its static performance;②Analysis based on the results of the test the hole shape, expansion ratio, steel beam flange concrete slab embedded depth and the length of the stud on the mechanical behavior of steel and concrete honeycomb composite effect;③ABAQUS is used to analyse three factors:the specimen model expand;④Based on the analysis of concrete strength, steel strength, expansion ratio and the web thickness of the steel beam on the mechanical property of steel-concrete satellated composite beams.Through the test and simulation analysis of the following main results:①the section stress and strain of steel-concrete satellated composite beams accord with flat section assumption;②steel-concrete satellated composite beam destruction experienced elastic stage, elastic-plastic stage and decline stage;③steel-concrete composite beam cracking load, yield load and ultimate load than solid-web steel-concrete composite beams have improved obvisly;④The length of the stud, steel flange to the concrete embedded depth of steel and concrete has a great influence on the bearing capacity of steel-concrete satellated composite beams,it improved20%and11%; The impact is not big but hole shape of composite beams;⑤Circle around the stress distribution and hexagon distributed circumferential stress distribution are similar;⑥The ultimate bearing capacity of the composite beams with web thickness uniform linear rise;⑦while the expansion ratio is1.44.the composite beams is ultimate.