钢简支梁的新型桥面连续结构抗弯性能试验研究  

Experimental study on flexural behavior of novel continuous deck structure in steel simply-supported beams

作　　者：邵旭东[1,2] 周银东 曹君辉[1] 孙平宽 祝飞翔 Shoo Xudong;Zhou Yindong;Cao Junhui;Sun Pingkuan;Zhu Feixiang(Hunan University,Changsha 410082,China;Hunan Province Key Laboratory of Wind and Bridge Engineering,Hunan University,Changsha 410082,China;China Highway Engineering Consultants Corporation,Beijing 100195,China)

机构地区：[1]湖南大学,湖南长沙410082 [2]湖南大学风工程与桥梁工程湖南省重点实验室,湖南长沙410082 [3]中国公路工程咨询集团有限公司,北京100195

出　　处：《土木工程学报》2019年第12期80-92,共13页China Civil Engineering Journal

基　　金：国家自然科学基金(51778223,51708200);湖南省科技重大专项(2017SK1010);中国博士后科学基金(2017M610497)

摘　　要：简支梁桥桥面伸缩缝多,导致行车不舒适,因而多跨简支梁采取桥面连续的措施被广泛应用。海南铺前跨海大桥引桥跨越地震带,为提高行车舒适性,同时达到强震下保护钢梁梁体的目的,文章提出受力性能优良、易修复的钢-STC(super toughness concrete,简称STC)轻型组合简支变桥面连续结构。为探明该简支梁的新型桥面连续结构的抗弯性能,设计两种方案,并对两种方案分别开展负弯矩区足尺模型试验。结果表明,方案2的裂缝开展集中在螺栓连接带区域,而方案1螺栓带STC基本无裂缝发展。从破坏模式看,方案1为U肋受压屈服,螺栓未剪断;方案2为螺栓剪断,U肋未屈服,这意味着在强震下简支变桥面连续结构可保护钢箱梁主体结构。通过有限元软件对试验进行仿真模拟,计算结果与试验结果吻合良好。在此基础上,对两种桥面连续结构方案进行实桥有限元计算,结果表明,两种方案均能满足正常使用极限状态的使用要求,但方案2中STC层的抗裂安全系数(21.4MPa/19.7MPa=1.09)高于方案1(22.4MPa/22.0MPa=1.02)。通过计算两个方案的设计弯矩,并与试验得到的极限抗弯承载力比较,方案1和方案2的承载力系数分别为1.1和1.8,方案2高于方案1。同时计算得到两个方案的转角刚度基本持平,均高于原简支梁设计方案。综合试验结果和计算结果,方案2优于方案1,目前该方案已应用于海南铺前跨海大桥的引桥工程中。A large number of expansion joints on bridge decks of simply-supported beam bridges may lead to driving uncomfortable,so that the measures of continuous decks for multi-span simply-supported beam bridges have been widely used.The Hainan Puqian sea-crossing bridge is located in the seismic zone.To improve driving comfort and to achieve the purpose of protecting the main structure of the box girder under strong earthquake,a continuous structure of steel-STC lightweight composite simply-supported beam bridges with excellent performance and easy to repair was proposed.To explore the bending resistance of the continuous bridge deck of simply-supported beam bridge,two schemes were proposed for the full-scale model test of negative bending moment.Test results showed that in the scheme 2,the cracks focused on the bolt connection area,but in the scheme 1,rare cracks occurred at the bolt connection area.From the failure mode,it was observed that in the scheme 1,U ribs yielded under compression and the bolts didn’t fail under shearing.While in the scheme 2,U ribs didn’t yield and the bolts failed under shearing.That means that under seismic loads the continuous deck structure was destroyed firstly to protect the main structure of the box girder.Finite element software was used to simulate the experiments,and the results agreed well with the test results.On this basis,the finite element calculations of real bridge for the two schemes of continuous decks of Hainan Puqian sea-crossing bridge were carried out.The results disclosethat both schemes can meet the requirements of serviceability limit state.However,the factor of safety against cracking of the STC layer in scheme 2(21.4 MPa/19.7 MPa=1.09)is higher than scheme 1(22.4 MPa/22.0 MPa=1.02).By calculating the design moment of the two schemes and comparing with the ultimate flexural capacity obtained from the test,the bearing capacity coefficients of scheme 1 and scheme 2 are 1.1 and 1.8 respectively,and that of scheme 2 is higher than that of scheme 1.In addition,the an

关 键 词：钢-STC轻型组合桥面结构 钢简支梁的桥面连续结构 足尺模型试验 有限元分析 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]