This study presents an investigation on the fatigue analysis of four types of details on orthotropic steel decks(OSDs)for a cable-stayed super-wide steel box girder bridge based on finite-element analysis(FEA)with veh...This study presents an investigation on the fatigue analysis of four types of details on orthotropic steel decks(OSDs)for a cable-stayed super-wide steel box girder bridge based on finite-element analysis(FEA)with vehicle transverse distribution model(VTDM).A high-fidelity 3D FE model verified by the static load test is established to satisfy the fatigue analysis accuracy.The stress behavior of super-wide steel box girders under the vehicle load at different lane locations is investigated.Then,considering the effect of VTDM,the fatigue life analysis of four typical details is performed using the Miner cumulative damage rule.The results show that the vehicle transverse location has a great influence on the stress behavior of details with sharp influence surface,and the stress ranges in the outermost lane are larger than those in other lanes,indicating that the details of OSD in the outermost lane are prone to fatigue.The fatigue life analysis indicates that the diaphragm cutout is more prone to fatigue than other details,which should be carefully treated in bridge maintenance.展开更多
This paper deeply analyses the influence of different local tectonic on stress performance of spatial curved steel box Girder Bridge, using the finite element analysis software to establish space finite element model ...This paper deeply analyses the influence of different local tectonic on stress performance of spatial curved steel box Girder Bridge, using the finite element analysis software to establish space finite element model of this bridge, calculation and analysis were made on the bridge of the strength, stiffness. It has certain reference value for guiding engineering design, have a good foundation for the mechanical properties and stability of linear and nonlinear further study of curved steel box girder.展开更多
Steel and steel-concrete composite girders are two types of girders commonly used for long-span bridges. However, practice has shown that the two types of girders have some drawbacks. For steel girders, the orthotropi...Steel and steel-concrete composite girders are two types of girders commonly used for long-span bridges. However, practice has shown that the two types of girders have some drawbacks. For steel girders, the orthotropic steel deck (OSD) is vulnerable to fatigue cracking and the asphalt overlay is susceptible to damage such as rutting and pot holes. While for steel-concrete composite girders, the concrete deck is generally thick and heavy, and the deck is prone to cracking because of its low tensile strength and high creep. Thus, to improve the serviceability and durability of girders for long-span bridges, three new types of steel-UHPC lightweight composite bridge girders are proposed, where UHPC denotes ultra-high performance concrete. The first two types consist of an OSD and a thin UHPC layer while the third type consists of a steel beam and a UHPC waffle deck. Due to excellent mechanical behaviors and impressive durability of UHPC, the steel-UHPC composite girders have the advantages of light weight, high strength, low creep coefficient, low risk of cracking, and excellent durability, making them competitive alternatives for long-span bridges. To date, the proposed steel-UHPC composite girders have been applied to 14 real bridges in China. It is expected that the application of the new steel-UHPC composite girders on long-span bridges will have a promising future.展开更多
为了改善目前常用的钢箱梁铺装柔性铺装在使用过程中容易出现铺装层开裂、脱粘、车辙、坑槽等病害的问题,结合成都市东西城市轴线绕城高速节点钢箱梁桥工程,对常用的钢箱梁柔性铺装和刚性铺装(45 mm超高韧性混凝土+50 mm SMA铺装和钢纤...为了改善目前常用的钢箱梁铺装柔性铺装在使用过程中容易出现铺装层开裂、脱粘、车辙、坑槽等病害的问题,结合成都市东西城市轴线绕城高速节点钢箱梁桥工程,对常用的钢箱梁柔性铺装和刚性铺装(45 mm超高韧性混凝土+50 mm SMA铺装和钢纤维混凝土+沥青混凝土铺装)进行分析,对比不同铺装形式下桥面板的刚度、主梁应力和单位面积造价。结果表明:采用钢纤维混凝土+沥青混凝土铺装方案,可以改善桥面板局部受力状况,降低钢桥面疲劳开裂及铺装层开裂、车辙等风险,降低工程造价。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.51778135,52178119)the Distinguished Young Scientists of Jiangsu Province(Grant No.BK20190013)the National Key R&D Program Foundation of China(Grant No.2017YFC0806001).
文摘This study presents an investigation on the fatigue analysis of four types of details on orthotropic steel decks(OSDs)for a cable-stayed super-wide steel box girder bridge based on finite-element analysis(FEA)with vehicle transverse distribution model(VTDM).A high-fidelity 3D FE model verified by the static load test is established to satisfy the fatigue analysis accuracy.The stress behavior of super-wide steel box girders under the vehicle load at different lane locations is investigated.Then,considering the effect of VTDM,the fatigue life analysis of four typical details is performed using the Miner cumulative damage rule.The results show that the vehicle transverse location has a great influence on the stress behavior of details with sharp influence surface,and the stress ranges in the outermost lane are larger than those in other lanes,indicating that the details of OSD in the outermost lane are prone to fatigue.The fatigue life analysis indicates that the diaphragm cutout is more prone to fatigue than other details,which should be carefully treated in bridge maintenance.
文摘This paper deeply analyses the influence of different local tectonic on stress performance of spatial curved steel box Girder Bridge, using the finite element analysis software to establish space finite element model of this bridge, calculation and analysis were made on the bridge of the strength, stiffness. It has certain reference value for guiding engineering design, have a good foundation for the mechanical properties and stability of linear and nonlinear further study of curved steel box girder.
基金The authors would like to thank the following funders for providing support to this research: the National Key Research and Development Program of China (No. 2018YFC0705400)the National Natural Science Foundation of China (Grant Nos. 51778223 and 51708200)the Major Program of Science and Technology of Hunan Province (No. 2017SK1010).
文摘Steel and steel-concrete composite girders are two types of girders commonly used for long-span bridges. However, practice has shown that the two types of girders have some drawbacks. For steel girders, the orthotropic steel deck (OSD) is vulnerable to fatigue cracking and the asphalt overlay is susceptible to damage such as rutting and pot holes. While for steel-concrete composite girders, the concrete deck is generally thick and heavy, and the deck is prone to cracking because of its low tensile strength and high creep. Thus, to improve the serviceability and durability of girders for long-span bridges, three new types of steel-UHPC lightweight composite bridge girders are proposed, where UHPC denotes ultra-high performance concrete. The first two types consist of an OSD and a thin UHPC layer while the third type consists of a steel beam and a UHPC waffle deck. Due to excellent mechanical behaviors and impressive durability of UHPC, the steel-UHPC composite girders have the advantages of light weight, high strength, low creep coefficient, low risk of cracking, and excellent durability, making them competitive alternatives for long-span bridges. To date, the proposed steel-UHPC composite girders have been applied to 14 real bridges in China. It is expected that the application of the new steel-UHPC composite girders on long-span bridges will have a promising future.
文摘为了改善目前常用的钢箱梁铺装柔性铺装在使用过程中容易出现铺装层开裂、脱粘、车辙、坑槽等病害的问题,结合成都市东西城市轴线绕城高速节点钢箱梁桥工程,对常用的钢箱梁柔性铺装和刚性铺装(45 mm超高韧性混凝土+50 mm SMA铺装和钢纤维混凝土+沥青混凝土铺装)进行分析,对比不同铺装形式下桥面板的刚度、主梁应力和单位面积造价。结果表明:采用钢纤维混凝土+沥青混凝土铺装方案,可以改善桥面板局部受力状况,降低钢桥面疲劳开裂及铺装层开裂、车辙等风险,降低工程造价。
