集中荷载作用下钢筋混凝土梁箍筋有效性系数研究

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中图分类号：TU375 文献标志码：A DOI： 10.15935/j.cnki.jggcs.202504.0002

AbstractTo assess stirrup stress in reinforced concrete beams under concentrated loads，ATENA software was employed to perform nonlinear finite element analysis of shear behaviorin test beams.This study compiled shear test data from 158 reinforced concrete beams with stirrups subjected to concentrated loads（shear-span ratio ≥2.5）.Using a validated finite element model，we calculated the stress in stirups intersected by the critical diagonal crack at the ultimate limit state of bearing capacity.Results demonstrate that the 45∘ truss model substantially underestimates stirrup shear resistance in ultimate limit state conditions.We recommend revising GB/T 5001O—2010（Code for Design of Concrete Structures）to adopt a stirrup effectiveness coefficient of1.25 in the shear capacity design formula for reinforced concrete beams，along with corresponding adjustments to the concrete contribution term.

Keywordsreinforced concrete beam，shear bearing capacity，stirrup effctiveness，ATENA，finite element analysis

0 引言

剪力主要取决于临界斜裂缝倾角的大小，而临界斜裂缝倾角与剪跨比、混凝土强度、纵向受拉钢筋配筋率及配箍率有关，其中剪跨比的影响最为显著。（剩余9834字）