【摘要】 对国内外有关钢 混凝土组合梁考虑收缩徐变的长期变形研究成果进行了综述。基于大型商用软件SOFISTIK的计算结果与分析,指出中国现行《钢结构设计规范》(GB50017,送审稿)和《公路桥涵钢结构及木结构设计规范》(JTJ025 86)中关于钢 混凝土组合梁长期变形计算的单一弹性模量折减系数法偏于不安全,并提出了弹性模量折减系数按混凝土龄期分时段取值的长期变形计算建议。更多还原

【Abstract】 The existing research achievements on long-term deflections of steel-concrete composite beams due to shrinkage and creep were summarized. Based on the calculations by program SOFISTIK,it is found that the long-term deformations are unsafely evaluated with a single reduction factor of concrete’.s elastic modulus in the current Chinese Code "Specifications for Design of Steel Structures"(GB50017) and "Specifications for Design of Steel and Timber Construction of Highway Bridges and Culverts"(JTJ 025-86). The reduction factors according to the age of concrete were given,and the corresponding design suggestions were put forward.更多还原