预应力混凝土梁体弹性模量理论与试验研究  

Theoretical and Experimental Study on Elastic Modulus of Prestressed Concrete Beams

作　　者：程海根[1] 曾辉[1] 伍坤 黄小文 CHENG Haigen;ZENG Hui;WU Kun;HUANG Xiaowen(East China Jiaotong University,Nanchang,Jiangxi 330013,China;Jiangxi Tianchi Highway Technology Co.Ltd,Nanchang,Jiangxi 330013,China)

机构地区：[1]华东交通大学,南昌330013 [2]江西省天驰高速科技发展有限公司,南昌330103

出　　处：《铁道工程学报》2025年第1期42-49,共8页Journal of Railway Engineering Society

基　　金：江西省交通运输厅科技项目(2021H0036);国家自然科学基金项目(51068005)。

摘　　要：研究目的:弹性模量是分析混凝土结构力学性能的关键参数。在预应力混凝土结构设计中,通常直接采用混凝土的弹性模量简化计算,但这种方法忽略了预应力筋和普通钢筋的影响。本研究旨在通过理论分析与试验验证,探索预应力筋和普通钢筋对预应力混凝土梁体弹性模量的实际影响,提出一种基于等效刚度相等原则的梁体弹性模量解析公式。利用ANSYS Workbench软件模拟不同配筋条件下的梁体弹性模量,并通过试验验证模型的准确性和可靠性。研究结论:(1)预应力筋和普通钢筋配筋率对预应力混凝土梁体弹性模量均有显著影响,且两者之间存在线性关系;(2)随着配筋率的增加,梁体弹性模量明显提升,当配筋率为3%时,梁体弹性模量相比混凝土弹性模量提高了27.3%;当配筋率为5%时,提高了44.3%;(3)本研究成果可应用于预应力混凝土结构的设计优化中;考虑配筋对弹性模量的影响,能够显著减少结构计算中的误差,提高工程安全性与经济性。Research purposes:Elastic modulus is a key parameter to analyze the mechanical properties of concrete structures.In the design of prestressed concrete structures,the elastic modulus of concrete is usually directly used to simplify the calculation,but this method ignores the influence of prestressed reinforcement and ordinary reinforcement.The purpose of this study is to explore the actual influence of prestressed reinforcement and ordinary reinforcement on the elastic modulus of prestressed concrete beams through theoretical analysis and experimental verification,and to propose an analytical formula for the elastic modulus of beams based on the principle of equal equivalent stiffness.ANSYS Workbench software is used to simulate the elastic modulus of the beam under different reinforcement conditions,and the accuracy and reliability of the model are verified by experiments.Research conclusions:(1)The reinforcement ratio of prestressed reinforcement and ordinary reinforcement has a significant effect on the elastic modulus of prestressed concrete beams,and there is a linear relationship between them.(2)With the increase of reinforcement ratio,the elastic modulus of the beam is obviously improved.When the reinforcement ratio is 3%,the elastic modulus of the beam is 27.3%higher than that of the concrete.When the reinforcement ratio is 5%,it is increased by 44.3%.(3)The research results can be applied to the design optimization of prestressed concrete structures.Considering the influence of reinforcement on the elastic modulus,it can significantly reduce the error in the structural calculation and improve the safety and economy of the project.

关 键 词：桥梁工程 预应力混凝土 弹性模量 数值模拟 ANSYS Workbench 

分 类 号：U441[建筑科学—桥梁与隧道工程]