部分剪力连接新型外包钢-砼组合梁的滑移性能

针对典型的钢-砼组合梁的不足,提出一种新型外包钢-砼组合梁.为研究其钢-砼交界面相对滑移及变形性能,通过4根足尺简支梁的试验研究,得到组合梁的荷载-滑移、荷载-挠度关系曲线.根据试验结果分析了新型外包钢-砼组合梁交界面相对滑移发展的过程和分布规律.利用有限元分析软件ANSYS,对组合梁的交界面相对滑移性能进行了非线性有限元分析,提出剪力连接系数的合理范围.在基于现行规范的基础上提出了组合梁跨中挠度的建议计算公式.把有限元模型和建议公式的计算结果与试验结果进行比较,三者吻合良好.

Research on the Interface Slip of New Type Steel- encased Concrete Composite Beams with Partial Shear Connection

In view of at some problems of common steel-concrete beams,a new type of steel-encased concrete composite beams is put forward.To study the interface slip and deformation character,four simple supported specimens of full size have been performed,the load-slip curves,load-deflection curves are established through the experiment.Based on these results,the interface slip development process and laws are gained.Considering the interface slip,a nonlinear finite element analysis model is established by using finite element analysis soft-ANSYS,and gained a reasonable shearing connection coefficient.Based on actual code,a theoretical formula is proposed for deflection.The results of finite element model and theoretical formula are proved to be in good agreement with the experimental results.