In order to study the effect of web openings on the behavior of composite beams under negative moment,three perforated and one unperforated cantilever composite beams were designed and tested.

• 为研究腹板开洞对负弯矩区组合梁受力性能的影响,对三根腹板开洞外挑组合梁和一根对比梁进行了试验研究,考虑是否开洞、洞口大小、洞口补强等参数的影响。