圆环形构件混合配筋计算半解析解  

Semi- analytical solution for calculation of mixed reinforcement of annular members

作　　者：时仓艳[1,2] 龚维明 朱建民[3] 王磊 SHI Cangyan;GONGWeiming;ZHU Jianmin;WANG Lei(School of Civil Engineering,Southeast University,Nanjing 211189,China;School of Civil Engineering,Sanjiang University,Nanjing 210013,China;Nanjing Dongda Bi-directional Pile Test Co.,Ltd.,Nanjing 210018,China;Nanjing Dongtu Construction Technology Co.,Ltd.,Nanjing 211164,China)

机构地区：[1]东南大学土木工程学院,江苏南京211189 [2]三江学院土木工程学院,江苏南京210013 [3]南京东大自平衡桩基检测有限公司,江苏南京210018 [4]南京东土建设科技有限公司,江苏南京211164

出　　处：《混凝土》2023年第12期222-225,230,共5页Concrete

基　　金：国家自然科学基金(51678145)。

摘　　要：为揭示圆环形构件配制的混合钢筋的受力机理,区分沿圆环布置的混合钢筋受力形态与矩形的区别,推演出其正截面受压、受弯承载力计算式。通过分析预应力筋在加工阶段预拉力和预应力筋、普通钢筋工作阶段外力作用下,所引起的应变、应力变化规律,并根据受力特点,以受压、受拉为截面界限线划分不同区域,对各区域分别计算受拉、受压合力以及合力矩,建立平衡方程,从而推演出预应力筋沿圆环形截面分布的受压、受弯承载力计算式。分析过程包括从圆心的零应力到界限破坏时混凝土、预应力筋的极限应力值整个过程,并针对其中局部线性分布的应力图形,采用积分方法进行计算。结果表明,推演的计算式与规范提供的圆环形构件配筋计算式一致,计算式适用于所有圆环形构件混合配筋计算,同时计算式及规范中计算式均为近似简化结果,非精确解。In order to reveal the stress mechanism of the hybrid steel bars arranged in the ring-shaped member,distinguish the difference between the stress form of the hybrid bars arranged along the ring and the rectangle,and deduce the calculation formula of the compressive and flexural bearing capacity of the normal section.The variation law of strain and stress caused by the stress bars under the action of pre-tension and pre-stress bars in the construction stage and the external force of ordinary steel bars in the working stage,and according to the characteristics of the force,the compression and tension are used as the boundary lines of the section to divide different areas.The resultant force and moment in tension,compression and moment are calculated separately in each area to establish a balance equation,and then the calculation formula for the compressive and flexural bearing capacity of the prestressed tendons distributed along the circular section can be deduced.The analysis process includes the whole process from the zero stress at the center of the circle to the ultimate stress value of the concrete and prestressed tendons when the limit fails,and the integral method is used to calculate the local linearly distributed stress graph.The results show that the formula deduced is consistent with the calculation formula for the reinforcement of annular members provided by the code.This formula is suitable for the calculation of prestressed reinforcement of all annular members.At the same time,this formula and the formula in the code are approximate simplified results,which are not accurate.

关 键 词：圆环形构件 混合配筋 解析解 线性分布 应力应变 

分 类 号：TU528.79[建筑科学—建筑技术科学]