摘要
对中欧美规范中拉伸锚固长度的定义和计算公式进行了比较,并选取不同工况,重点考虑了钢筋间距和直径、混凝土强度和保护层厚度的影响,用规范公式对梁和板中的锚固长度进行了计算分析。通过对比发现,在几种主要因素影响下,Eurocode 2锚固长度曲线变化趋势和极限锚固长度曲线变化趋势整体上比较接近。当考虑钢筋间距和直径的影响时,在梁中和板中,GB 50010—2002的变化趋势和Eurocode 2比较相似,值也比较接近。在考虑混凝土强度和保护层厚度时,GB 50010—2002精细方法计算值在影响因素取值较大时,对于板来说偏保守,建议取个适当的折减系数。ACI318-05多数因素影响下均偏保守,建议考虑相应因素的影响时取合适的折减系数。
This paper compares the definition and formulas of tensile anchorage length in Chinese,European and American Standards.Considering bar spacing and diameter,concrete strength and cover,the anchorage lengths for both beams and slabs have been calculated by using different formulas under different conditions.Through comparison,it is easy to find that the curve trend for Eurocode 2 is similar as that gained by the formula for calculating the critical development lengths in most conditions.When considering the influencing factors of bar diameter and spacing,GB 50010—2002 has the similar curve trend and calculation values as that gained from Eurocode 2 both in the beam and slab.However,the refine method for GB 50010—2002 is pretty much conservative for the slab when considering the effect factors of concrete strength and concrete cover,and it is better to choose a proper reduction factor.In addition,the anchorage lengths calculated according to ACI318-05 are more conservative in most conditions and it is better to choose some corresponding reduction factors,too.
出处
《结构工程师》
2010年第3期170-175,共6页
Structural Engineers
基金
同济大学短期出国访学奖励基金研究资助项目(200806)
