钢筋混凝土空心墩有效刚度试验研究  

Experimental study on effective stiffness of reinforced concrete hollow piers

作　　者：韦旺 邵长江[1,2] 肖正豪 漆启明 胡晨旭 肖来川 王猛[1] Wei Wang;Shao Changjiang;Xiao Zhenghao;Qi Qiming;Hu Chenxu;Xiao Laichuan;Wang Meng(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;National Engineering Laboratory of Geological Disaster Prevention Technology in Land Transportation, Southwest Jiaotong University,Chengdu 610031, China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学陆地交通地质灾害防治技术国家工程实验室,四川成都610031

出　　处：《土木工程学报》2019年第10期101-110,共10页China Civil Engineering Journal

基　　金：国家自然科学基金(51178395);四川省应用基础研究重点项目(2017JY0059)

摘　　要：梳理既有桥墩有效刚度公式,结合 35 个矩形空心墩和 44 个方形实心墩试验数据探讨既有公式的合理性,发现既有公式对空心墩的适用性有待深入提高。为此,课题组基于拟静力试验,分析空心墩与实心墩有效刚度的差异性、影响因素及屈服位移三分量贡献率。以轴压比、剪跨比及fydb/(L√f'c)为控制参数,给出两类桥墩有效刚度的回归公式;并通过 5 个圆端型薄壁空心墩的拟静力试验结果,验证回归公式对薄壁空心墩的适用性。研究表明:相对于轴压比、剪跨比的影响,配筋率、纵筋及混凝土强度等对有效刚度影响不显著;有效刚度随轴压比、剪跨比的增大而显著增大,随参数(fydb/(L√f'c))的增大而减小;回归公式 I 适用于估算方形实心墩的有效刚度,回归公式 II 适用于估算矩形及圆端薄壁空心墩的有效刚度。The existing formulas of effective stiffness are summarized, and their reasonability are discussed based on the experimental data of 35 rectangular hollow and 44 rectangular solid columns. It is found that their applicability should be further improved. According to the quasi-static test results, the different characteristics in effective stiffness between the hollow and solid columns, influence factors and the three-component yield displacement are investigated. The formulas of effective stiffness were regressed for the two types of columns with axial compression ratio, shear span ratio and fydb/(L√f'c) as the control parameters. The applicability of the regression formulas was validated by the test results of five round-end hollow specimens. The research results show that compared with the axial compression ratio and the shearing-span ratio, the ratio of rebar, strength of longitudinal steel and concrete have less influence on the effective stiffness. The effective stiffness increases with the axial compression ratio and the shearing-span ratio, while decreases with fydb/(L√f'c). The regression formula I is suitable to estimate the effective stiffness of square solid piers, and formula II is applicable to predict the effective stiffness of rectangular and thin-walled round-end hollow columns.

关 键 词：矩形空心墩 方形实心墩 有效刚度 回归公式 圆端薄壁空心墩 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]