圆形截面非均匀对称配筋的无量纲诺模图  

Dimensionless Nomograph of Non-uniform Reinforcement with Circular Section

作　　者：任志文 周东华[1] 双超 李露 罗莎 REN Zhiwen;ZHOU Donghua;SHUANG Chao;LI Lu;LUO Sha(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650504)

机构地区：[1]昆明理工大学建筑工程学院,昆明650504

出　　处：《工业安全与环保》2020年第11期18-22,共5页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(51668027,51468026)。

摘　　要：圆形截面的配筋计算存在双重非线性,即材料和截面宽度变化的非线性,《混凝土结构设计规范》给出了计算配筋的超越方程组,但需要迭代求解,不能手算。另外该超越方程组是基于钢筋沿周边均匀布置推导的,靠近中性轴附近的钢筋因力臂小而不能充分利用其强度,针对以上这两特点,根据规范中对混凝土和钢筋应变的相关规定,利用极限和屈服应变的关键点对应变进行了分区,之后结合材料的本构关系对圆形截面的配筋计算公式进行了推导,并将用公式计算得到的结果绘制成了能手算配筋的诺模图,由此计算快速方便,无需迭代,另外本文采用的非均匀布筋方式还可更有效地利用钢筋强度,提高经济效益。The reinforcement calculation of circular section has double nonlinearity,that is,the nonlinearity of material and section width change."The code for design of concrete structures"gives the transcendental equations for the reinforcement calculation,but it needs to be solved iteratively.In addition,the above equations is derived based on the reinforcement along the peripheral uniform arrangement,and because the arm near neutral axis of the reinforcing steel bar is small,it can′t make full use of its strength.Based on the characteristics of the two above,according to the specification of concrete and steel strain rules,the limit and the yield strain of the key points of strain on the partition is used,the combination of material constitutive relation for circular cross section of reinforcement calculation formula is derived,and the formula calculation results are used to draw a good reinforcement of nomograph,thus this calculation is quick and easy,without iteration.In addition,the non-uniform reinforcement method adopted in this paper can make more effective use of the strength of reinforcement and improve economic benefits.

关 键 词：非均匀对称配筋 应变积分 无量纲 诺模图 

分 类 号：TU755.3[建筑科学—建筑技术科学]