考虑厚板约束效应的预应力型钢混凝土楼盖有效翼缘宽度计算方法  

Method for Calculating the Effective Flange Width of the Prestressed Steel Reinforced Concrete Floor Considering the Restraint Effect of Thick Slab

作　　者：张绍华 胡杰 刘新新 王骁 周臻[4] 黄林杰 Zhang Shaohua;Hu Jie;Liu Xinxin;Wang Xiao;Zhou Zhen;Huang Linjie(China Design Group,Nanjing 210014,China;Nanjing Forestry University,210037,China;Xuzhou Metro Group Co.,Ltd.,221000,China;Southeast University,Nanjing 211189,China Key Laboratory of Concrete and Prestressed Concrete Structures,Ministry of Education,Nanjing 211189,China)

机构地区：[1]华设设计集团股份有限公司,南京210014 [2]南京林业大学,210037 [3]徐州地铁集团有限公司,221000 [4]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189

出　　处：《特种结构》2025年第1期22-28,共7页Special Structures

基　　金：江苏省重点研发计划资助项目(BE2018675)。

摘　　要：预应力型钢混凝土组合楼盖体系相比于钢筋混凝土楼盖体系力学性能更复杂,按照现有规范规定的计算方法所得效翼缘宽度会导致较大误差,且不能准确反映楼板对结构整体力学性能的贡献。因此,本文对一考虑厚板约束效应的预应力型钢混凝土楼盖进行数值分析,研究楼板厚度对预应力型钢混凝土楼盖体系有效翼缘宽度的影响规律。分析了不同板厚的结构在弯矩和轴力作用下,跨中和支座处板内应力的发展趋势;通过分析结构正常使用极限状态下的有效翼缘宽度,对《组合结构设计规范》(JGJ138-2016)中梁的有效翼缘计算公式进行了修正。结果表明:在板厚一定时,板内应力随其距离梁中心位置的增大而降低;一定范围内,随着板厚增大,板内应力下降趋势明显增大;结构的有效翼缘宽度值随着板厚的增大而降低;利用有效翼缘宽度值修正的规范公式具有较高的准确性,可以较好地反映结构有效翼缘宽度随板厚的变化规律。Compared to reinforced concrete floor system,the mechanical properties of prestressed steel reinforced concrete floor system are more complex,and the research on the effective flange width is insufficient.To study the development pattern of the effective flange width of prestressed steel reinforced concrete floor system under different slab thicknesses in the serviceability limit state,numerical simulation was conducted on prestressed steel reinforced concrete floor considering the constraint effects of thick slabs.The development trend of slab stress in mid-span and connection of the structure with different slab thickness under the action of bending moment and axial force was studied.By analyzing the effective flange width of structures in the serviceability imit state,the calculation formula for the effective flange width of beams in the code for design of composite structures(JGJ 1382016)was modified.The results showed that,with a constant slab thickness,the slab stress decreased as the distance from the beam center increased.Within a certain range,at the same position away from the beam center,an increase in slab thickness lead to a greater reduction in slab stress.The effective flange width of the structure decreased with the increase of slab thickness.The formula modified by effective flange width has high accuracy and can effectively reflect the development of the effective flange width of the structure under different slab thicknesses.

关 键 词：预应力 预应力型钢混凝土楼盖体系 有效翼缘宽度 应力 

分 类 号：TU311.4[建筑科学—结构工程]