基于有限条带法的高强钢筋-超高性能混凝土构件受弯性能分析

Finite Strip Analysis of Properties of UHPC Members Reinforced with High Strength Steel Bars

由于超高性能混凝土(UHPC)的受力性能有别于普通混凝土,配筋UHPC构件的设计无法直接沿用普通钢筋混凝土构件的设计方法,故有必要进行针对性的研究。基于有限条带法建立了关于截面弯矩和曲率的分析模型并采用MATLAB软件编制了相关计算程序,通过与试验数据对比,验证了计算程序的适用性,并进行了参数的扩展分析,研究参数包括配筋率、UHPC占比及填充区域。研究发现:在配筋率适中的情况下,推荐将一部分UHPC同时配置于截面的受压区和受拉区。而对于较高配筋率的情况,为保证构件延性,应尽量采用全截面UHPC方案。

Since the properties of UHPC is different from ordinary concrete,it is inappropriate to simply adopt the design methods for concrete structures and it needs to be investigated in detail.In this paper,based on strip method,the analysis model of section bending moment and curvature was established and the related calculation program was compiled by MATLAB software.By comparing with the test data,the applicability of the calculation program was verified,and the parameters were extended,including the reinforcement rate,UHPC proportion and filling part.It was found that a portion of UHPC was recommended to be configured in both the compressive and tensile zones of the cross-section at moderate reinforcement rates.In the case of high reinforcement ratio,the full-section UHPC scheme should be used as far as possible to ensure the ductility of components.The conclusion provides a reference for section optimization configuration of flexural members.