内置钢骨形式对混凝土桥墩撞击性能影响研究  

Research on Influence of Embedded Steel Skeleton Form on Impact Performance of Concrete Piers

作　　者：陈佳佳[1] 张南[1] 巫业双 沙笑笑 CHEN Jiajia;ZHANG Nan;WU Yeshuang;SHA Xiaoxiao(College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China)

机构地区：[1]南京工业大学土木工程学院

出　　处：《防灾减灾工程学报》2018年第1期72-80,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51278243)资助

摘　　要：为研究内置钢骨形式对混凝土桥墩撞击性能的影响,进行了内置角钢、槽钢、钢管3种钢骨形式的混凝土桥墩模型水平撞击试验,得到撞击力时程曲线、位移时程曲线、钢材和混凝土的应变时程曲线。对内置不同钢骨形式的桥墩模型受撞各阶段的力学性能进行了对比分析,并运用力学方法计算了钢骨形式对混凝土桥墩撞击性能的影响。研究结果表明：钢骨形式对混凝土桥墩的撞击性能有一定影响;在相同撞击能量下,内置钢管混凝土桥墩的侧向变形较内置槽钢和内置角钢混凝土桥墩的侧向变形小;内置槽钢和钢管对墩底混凝土压应变增长有较大的抑制作用;内置钢管混凝土桥墩的破坏斜裂缝条数多且分布较宽,延性较好,抗撞击承载力较高。对桥墩底部斜裂缝区的混凝土主压应力和应变计算分析表明,不同钢骨形式改变了桥墩截面几何特性参数,影响了混凝土主压应力值;在相同配钢率情况下,内置钢管混凝土桥墩的墩底混凝土主压应力比内置角钢混凝土桥墩的墩底主压应力减小了24.54%;内置钢管混凝土桥墩的应变放大系数比内置角钢混凝土桥墩放大系数小。试验和计算分析均证实了内置钢管的混凝土桥墩具有较好的抗撞击性能。In order to study the influence of embedded steel skeleton form on the impact performance of concrete bridge piers,three kinds of concrete bridge piers with different embedded steel skeleton forms,i.e.,angle steel,steel channel,and steel pipe,were tested under horizontal impact force.The time-history curves of impact force,displacement and strain of steel and concrete,were obtained.The mechanical properties of bridge piers with different embedded steel skeleton forms at different impact stages were compared and analyzed.The influence of steel skeleton forms on the impact performance of concrete piers was calculated by means of mechanical analysis method.The experimental results show that the steel skeleton form has a certain influence on the impact performance of piers.Under the same impact energy,the lateral deformation of concrete piers embedded with steel pipe is smaller than that embedded with steel channel or angle steel.The embedment of steel channel and steel pipe can greatly inhibit the development of compressive strain in concrete at pier bottom.The concrete pier embedded with steel pipe has more failure diagonal cracks,better ductility and higher anti-impact capacity.The principal compressive stress and strain of concrete of diagonal crack zone at pier bottom are calculated and analyzed.The calculation and analysis results show that different steel skeleton forms change the geometrical parameters of the pier section,hence affecting the principal compressive stress of the concrete pier.The principal compressive stress of the concrete pier embedded with steel pipe is reduced by 24.54% compared to that embedded with angle steel under the same steel ratio.The strain amplification factor of concrete pier embedded with steel pipe is smaller than that embedded with angle steel.The experiments and calculation analyses prove that the concrete bridge pier embedded with steel pipe has better impact performance.

关 键 词：钢骨混凝土桥墩 钢骨形式 撞击性能 试验与分析 

分 类 号：U441[建筑科学—桥梁与隧道工程]