Abstract

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Title:: Experiment on Shear Behavior of Largesize Reinforced Concrete Multiribbed Thin Web Beams

Author(s):: WU Fang-bo; LI Jun; DENG Li-bin; YUE Jian-wu; ZHOU Xu-hong; School of Civil Engineering, Hunan University

Keywords:: reinforced concrete; multi-ribbed thin web beam; shear behavior; cracking load; ultimate load; failure characteristic

Abstract:: The experiment on the shear behavior of four largesize reinforced concrete multi-ribbed thin web beams under concentrated loading was carried out, the force processes of bearing capacity, cracking load, failure characteristic and shear capacity were comparatively analyzed. The results indicate that the force process of bearing capacity and failure characteristic of the multi-ribbed thin web beams is similar to that of normal beams with web reinforcement. The cracking load and ultimate load of the specimen with precast floor are larger than specimen without precast floor. The flexural stiffness and overall operating performance of the specimens are improved by precast floor. Through the analysis of shear capacity of four specimens experiment values and failure characteristic, it is obtained that whether the shear stirrup be fully utilized, depends on the location and the angle of diagonal crack to a great extent. The comparing of ultimate shear capacities of experiment values and the calculated values according to various code provisions indicate that due to the main factors of code in some countries on different levels, the calculated values of shear capacity are not the same. The measuredtocalculated ratio of shear capacity is minimum by Chinese code and Germany code, and the ratio is maximum by American code and United Kingdom code.