拉-压杆模型在钢筋混凝土构件设计中的应用

Application of Strut-and-tie Model on Reinforced Concrete Member Design

工程设计遇到具有复杂应力场的非弯曲构件,如缺口梁、错洞剪力墙等构件时,设计人员通常根据工程经验,以构造措施保证其抗震性能,然而对这种构造措施的依据及其适用性缺乏更深入的研究。通过对拉-压杆模型的介绍,结合我国现行规范给出适合我国规范的拉压-杆模型计算参数和设计步骤。同时以错洞剪力墙为例说明利用拉-压杆模型进行抗震设计的可行性,把结果和钢筋混凝土弹塑性有限元分析结果相比较,说明其优点及局限性。给出了若干应用拉压杆模型的设计工程实例,并对一些常用构造措施进行了讨论。

In engineering practices, designers often use details based on engineering experience to ensure the seismic performance of non-flexural members with complex stress fields, such as beam with dapped end and wall with staggered openings etc, but no further investigations are made on their basis and adaptability. By introducing the strut-and-tie model, the critical factors and design procedures which satisfy Chinese codes＇ requirements are given. As an example, a wall with staggered openings is analyzed using strut-and-tie model and nonlinear finite element analysis. The comparison of both analytical results is performed to indicate the advantages and limitations of strut-and-tie model. Finally, some design examples and a discussion on some details are presented.