有效高度对钢筋混凝土桥面板冲切强度的影响

INFLUENCE OF EFFECTIVE HEIGHT ON PUNCHING STRENGTH OF REINFORCED CONCRETE BRIDGE SLABS

有效高度是影响钢筋混凝土桥面板抗冲切承载力的主要因素之一。为了探究其对混凝土板冲切强度的影响,完成了有效高度不同的混凝土桥面板冲切试验,得到桥面板的破坏模式、钢筋和混凝土应变变化规律等,进而量化评估有效高度变化对混凝土桥面板冲切强度的影响。对已完成15块板的试验数据,结合文献资料对各国混凝土结构设计标准提出的桥面板冲切强度计算式进行对比分析并对其进行修正。结果表明:提高板的有效高度可以有效提高混凝土桥面板的抗冲切承载力;修正后计算结果与试验值进行比较,吻合程度较好。

Effective height is one of the important factors that affect the punching shear strength of reinforced concrete(RC)slab.In order to explore its influence on the punching strength of RC slab,an effective and highly different RC slab punching test has been conducted,and the failure mode of the slab,strain of reinforcement and concrete were obtained,then the impact of effective height change on punching shear strength of RC slabs was quantitatively evaluated.At the same time,the test data of 15 slabs were selected to compare and analyze the formulas of the punching shear strength proposed by various countries,then the correction was made.The results showed that increasing the effective height of the plate could significantly improve the punching shear strength of the RC slab,and the corrected calculation results were generally in agreement with the test values.