角钢连接件抗剪刚度试验及理论研究

由于具有承载力高、疲劳性能好以及施工便捷的优点,角钢连接件在桥隧结构中得到越来越广泛的应用.角钢连接件主要应用于沉管隧道结构中,且相关研究主要集中在日本.现有研究多针对角钢连接件的承载力而忽视了抗剪刚度,而抗剪刚度会对界面滑移、混凝土开裂以及构件刚度等性能造成影响.为了研究角钢连接件的抗剪刚度,基于实际工程以及中国规范...

Experimental and Theoretical Study on Shear Stiffness of Angle Shear Connectors

Angle shear connectors have garnered more applications in bridge and tunnel structures owing to their high shear strength,excellent fatigue performance,and convenient construction.Currently,angle shear connectors are mainly applied in immersed tunnels,and most studies related to angle shear connectors are mainly carried out in Japan.Existing research mainly focused on the shear strength of angle shear connectors and ignored their shear stiffness,whereas the shear stiffness will influence the interface slip,concrete crack,and the stiffness of structure members.To study the shear stiffness of angle shear connectors,6 groups of full-size push-out specimens were designed based on practical engineering and standard provisions in China,including 3 sizes of angle steel and 2 grades of concrete.To reduce discreteness,three duplicate specimens are present in each group.All specimens failed in the concrete crush mode of the experiment,and the shear strength and shear stiffness increase as the concrete strength increases.When using the same grade concrete,the shear performance of specimens with 3 sizes of angle shear connectors is similar.According to the curvature distribution data,the web of angle steel burdens larger moments and shear forces at the bottom while the flange burdens small moments,which indicates the small contribution of flange to resisting shear force.Based on the existing theoretical models and experimental data of angle shear connectors,the foundation beam model of angle steel was proposed via theoretical analysis.This model was verified based on 10 groups of shear-slip curves and 12 groups of curvature data and its results reveal the accuracy of the proposed model.Because the formula used in the proposed model was too complex,the formula of the shear stiffness was simplified according to the practical construction.The simplified formula was verified based on 10 groups of shear-slip curves;the results reveal the excellent accuracy of the simplified formula.