矮塔斜拉桥桥墩抗剪强度研究

The research of dwarf tower cable-stayed bridge piers shear strength

在地震荷载的作用下由于桥梁发生剪切破坏而导致整个桥梁结构发生破坏的情况时有发生,对桥墩抗剪能力进行专门的分析研究,从而采取必要的措施防止桥梁发生剪切破坏是非常重要的.本文在进行桥墩的抗剪分析时,选取了三个具有代表性的抗剪计算公式,即美国ATC-32、Caltrans公式以及Priestley等人建议的公式,分别用三者对所选矮塔斜拉桥的桥墩与桥塔进行了抗剪验算,其计算结果各不相同,经过分析研究知道Priestley等人建议的公式更为合理,计算精度更为精确,其计算得到的结果与实际情况更为接近,而ATC-32公式、Caltrans公式相对比较保守.

With the effect of the seismic load,bridge shear failures destroy the bridge structure frequently.Therefore,a specific research on bridge pier resistance to shear and the choice of effective measures to prevent failure by shear is of typical importance.In this paper,to launch an analysis on resistance to shear,the authors choose three typical formula as follows: the American ATC-32,Galtrans formula and the formula proposed by Priestley.By testifying the resistance to shear on pier and tower of a cable-stayed bridge with the three formula,researchers got different results.After analysis,it is found that formula proposed by Priestley has its rationality and can calculate precisely.Basing on such formula,the calculated result is closer to actual situation and compared with it,ATC-32 formula and Caltrans formula are conservative.