简支梁桥拱型桥面连续构造的受力性能  

Mechanical performance of arch-type continuous slab-deck on simply-supported girder bridge

作　　者：王岗[1,2] 谢旭[1] 王城泉[1] 申永刚[1] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310058 [2]浙江建设职业技术学院城市建设工程系,浙江杭州311231

出　　处：《浙江大学学报（工学版）》2014年第6期1049-1057,共9页Journal of Zhejiang University：Engineering Science

基　　金：浙江省交通厅纵向课题资助项目(2009H37);浙江省科技创新团队资助项目(2010R50037)

摘　　要：针对国内简支梁桥桥面连续混凝土开裂的现状,建立有限元模型分析桥面连续构造的破坏机理.分析结果表明:造成桥面连续混凝土开裂的主要原因是简支梁的纵向位移、转动及不均匀沉降引起的内力,直接作用于混凝土或通过纵向连接钢筋传递至混凝土,为了改变内力的传递方式,解决桥面连续混凝土的开裂问题,根据拱型结构拱脚受拉使拱顶产生正弯矩的受力特点,提出一种新型的拱型桥面连续装置.为了验证该装置的有效性,制作了拱型桥面连续和传统型桥面连续的模型并进行了设计荷载下的受力试验.试验对比结果及有限元计算表明:拱型桥面连续装置对混凝土的拉力有较好的分散作用,大大减小了桥面连续混凝土的纵桥向拉应力,有效地改善了桥面连续混凝土的开裂损伤.Focusing on the concrete cracking of the continuous slab-deck （CSD） on simply-supported girder bridges in China, a finite element model （FEM） of the CSD was established to analyze the damage mechanism. The analysis results show that the concrete cracking is mainly caused by the loading of longitudinal displacement, rotational deformation and uneven settlement of girders altogether, directly or through the longitudinal rebar. Therefore, to prevent the concrete from cracking, an arch-type CSD with the property that the tension loaded at arch feet would exert positive moment on the arch top was designed. The field comparison tests of an existing CSD and an arch-type CSD were conducted to verify the effectiveness of the new structure. The test and FEM results show that the longitudinal tensile stress of concrete on the arch-type CSD can be well scattered and significantly reduced by the arch structure, thus avoid the damage of the CSD.

关 键 词：简支梁桥 拱型桥面连续 受力性能 破坏机理 有限元 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]