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为研究腹板开洞连续组合梁的塑性性能,对5根腹板开洞连续组合梁和1根腹板无洞连续组合梁进行了试验研究与非线性有限元分析。研究重点为组合梁荷载-弯矩曲线、塑性区形成及钢梁底部纵向应变分布规律等。结果表明:与腹板无洞组合梁相比,洞口的存在使组合梁较早进入塑性并发生显著的内力重分布,中间支座弯矩减小,各跨跨中弯矩明显增大,从而造成中间支座处的塑性应变区域发展不如各跨跨中充分。
In order to study the plasticity of a continuous composite beam with a web opening, five RC beams with one web opening and one continuous web with no holes were tested with a nonlinear finite element method. The research focuses on the load-moment curve of composite beam, the formation of plastic zone and the distribution of longitudinal strain at the bottom of steel beam. The results show that compared with the web without holes, the presence of the hole makes the composite beam enter the plastic earlier and has a significant internal force redistribution. The bending moment of the intermediate support decreases and the bending moment of each span increases obviously. As a result, the development of plastic strain zone at the middle support is not as good as that of each span.