胶黏钢-混凝土组合梁的界面行为数值分析

Numerical analysis on interface behavior of adhesive bonded steel-concrete composite beams

根据推出的试验测试数据,将黏胶/混凝土界面的剪切-滑移行为用具备损伤本构关系的弹簧单元来模拟,建立胶黏钢-混凝土组合梁的三维非线性有限元模型.基于模拟结果,揭示了组合梁黏胶/混凝土界面的黏结应力分布规律及脱胶剥离过程.分析结果表明:弹性模量小的黏胶剂更有利于界面的剪力均匀传递,但会引起混凝土板和钢梁间产生大的相对滑动,导致结构整体承载力降低.胶黏组合梁的界面脱胶剥离是一个突发的典型脆性破坏过程,会产生灾难性后果,在设计过程中需引起足够重视.

The shear-slip behavior of adhesive/concrete interface was simulated by using the spring element with a damage-type law from the push-out experiment data. A three-dimensional nonlinear finite element model for the adhesive bonded steel-concrete composite beams was proposed. Based on the simulation results, the bonding stress distribution and the debonding process in the adhesive/concrete interface were revealed. Adhesive with less value of elastic modulus makes the shear transformation more evenly, but it may induce a bigger relative slip between the concrete slab and the steel girder, which may impair the car- rying capacity of the composite beams. Numerical results reveal that the debonding failure is a typical brit- tle destroy process with a catastrophic failure of the composite beams and must be paid enough attention during the design process.