钢骨混凝土桥墩撞击抗剪强度计算模型  

Analytical Model of Impact Shear Strength of Steel Reinforced Concrete Bridge Piers

作　　者：李清阳 张南[1] 李界全 高闵 陈佳佳[1] 沙笑笑 LI Qing-yang;ZHANG Nan;LI Jie-quan;GAO Min;CHEN Jia-jia;SHA Xiao-xiao(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,江苏南京211816

出　　处：《土木工程与管理学报》2019年第1期115-122,共8页Journal of Civil Engineering and Management

基　　金：国家自然科学基金(51278243)

摘　　要：为了研究钢骨混凝土桥墩的抗撞击性能,进行5根钢骨混凝土桥墩和1根钢筋混凝土桥墩水平撞击试验。试验结果表明:内置钢骨的加入对混凝土桥墩斜裂缝具有较好的抑制作用;钢骨混凝土桥墩相比钢筋混凝土桥墩具有较高的抗撞击强度。基于修正压力场理论,考虑应变率效应,分析受压区混凝土以及横向钢骨对撞击抗剪强度的影响,提出钢骨混凝土桥墩撞击抗剪强度计算模型,该模型通过斜压应力角θ和平均纵向应变εx考虑不同因素对撞击抗剪强度的影响。将不同计算模型与试验结果进行对比分析,本文模型计算结果与试验结果误差为13.10%,与试验结果较符合,可为钢骨混凝土桥墩的抗撞击设计提供参考。The horizontal impact loads tests of one reinforced concrete bridge piers and five steel-reinforced concrete bridge piers were conducted to study anti-impact performance of steel-reinforced concrete( SRC) piers. Results show: the embedded steel has a greater inhibition effect on diagonal cracks of concrete piers;steel-reinforced concrete bridge piers have higher anti-impact strength than reinforced concrete piers. Considering the strain rate effect,the influence of concrete in compression zone and transverse steel to shear strength were analyzed, an analytical model based on the modified compression field theory was proposed for impact shear strength of steel-reinforced concrete piers. The influence of different factors on impact shear strength were considered through the angle of inclination of principal stress and the average strain in longitudinal direction. Comparing the calculated results and experimental results by using various models,the deviation between the calculated results of this paper and the experimental results is 13.10%,which is in good agreement with experimental results,it will provide references for the anti-impact design of steel reinforced concrete bridge piers.

关 键 词：钢骨混凝土 桥墩 修正压力场理论 受剪计算模型 撞击抗剪强度 

分 类 号：U441[建筑科学—桥梁与隧道工程]