混凝土结构等耐久性截面的性能研究

Durability of the cross-section is not equal for traditional Concrete structures, which has been proved by the nature. A reinforcement design method was proposed by the applicant to achieve cross-sections of equal durability. The life can be extended for 80% and mechanical and service behaviors are excellent. This design method need more study...The equal durability design method was proposed by the applicant. The initial analysis of the durability by this method was performed. Flexural and shear behaviors of cross-sections of equal durability were studied by designed experimental programs, and the cross-section ductility was also investigated. ..To develop theories for the equal durability design method, further experimental programs need be performed to study the flexural and shear behaviors of designed beams, compressive behaviors of designed columns, fatigue behaviors of designed beams, and time-varying behaviors of cross-section resistance.

传统混凝土结构截面耐久性不等，已被大自然证实，申请者提出的等耐久性混凝土结构截面配筋方法，其耐久寿命可以延长约80%，且具有优良的力学性能和使用性能，值得推广而进行深入研究。. 申请者已进行了等耐久性截面配筋方法的研究，等耐久性截面配筋方法的耐久性初步分析研究，等耐久性混合配筋截面的抗弯、抗剪试验研究以及截面延性分析研究。. 为了建立等耐久性截面配筋设计理论，需进一步进行等耐久性混合配筋抗弯抗剪的试验研究，等耐久性混合配筋柱的受压弯试验研究，等耐久性混合配筋梁的疲劳试验研究以及混合配筋截面抗力时变性能研究。

FRP筋混凝土结构由于其使用性能差，无延性以及抗火性能差限制了使用范围。在截面等耐久性设计理念的基础上提出了混合配筋梁混凝土结构，它具有FRP混凝土结构和钢筋混凝土结构的优点。对混合配筋混凝土结构的截面延性进行了分析，提出了其截面延性的计算方法；对混合配筋混凝土抗弯性能进行了试验研究，提出了截面抗弯承载能力计算方法；对混合配筋混凝土梁的静力抗剪性能进行了试验研究，分析了斜裂缝出现后GFRP箍筋中剪切应力，提出抗剪承载能力计算公式；对混合配筋混凝土轴压柱以及偏压柱进行了试验研究，提出了抗压弯承载能力计算公式；对混合配筋混凝土梁进行了抗弯疲劳试验，提出了计算公式；对混合配筋混凝土梁抗火性能进行了试验研究，提出抗火设计方法。