超高性能混凝土华夫板受力性能试验研究与数值模拟  

Experimental and numerical investigations on mechanical performance of UHPC waffle panels

作　　者：丁然[1] 张亚朋 武维宏 樊健生[1] 张万 DING Ran;ZHANG Yapeng;WU Weihong;FAN Jiansheng;ZHANG Wan(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Gansu Province Transportation Planning,Survey&Design Institute Co.,Ltd,Lanzhou 730030,China;Gansu Highway Transportation Construction Group Co.,Ltd,Lanzhou 730030,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]甘肃省交通规划勘察设计院股份有限公司,甘肃兰州730030 [3]甘肃省公路交通建设集团有限公司,甘肃兰州730030

出　　处：《建筑结构学报》2024年第8期93-107,117,共16页Journal of Building Structures

基　　金：国家自然科学基金项目(52293433,52121005)。

摘　　要：超高性能混凝土(ultra-high performance concrete,UHPC)华夫板具有质量轻、刚度大、承载能力高等优点,在大跨度桥梁桥面板和建筑楼屋盖等工程中有良好的应用前景。通过4块UHPC华夫板1∶2缩尺模型的静力加载试验,研究了四点和四边支承边界条件、不同横肋间距下UHPC华夫板的抗裂性能、刚度、承载能力和受力机制。采用ABAQUS建立精细有限元模型,进一步研究了纵横肋受拉钢筋配筋率、纵横肋分布、顶板厚度、肋高等设计参数对UHPC华夫板受力性能的影响规律,并给出优化设计建议。结果表明:在四点加载阶段,设计轮载作用下华夫板基本不开裂;在跨中单点加载阶段,四点支承的UHPC华夫板发生弯曲破坏,且以纵向受力为主,四边支承的华夫板发生冲切破坏,刚度和承载力较四点支承华夫板的明显提高;适当增加横肋间距,减少横肋数量,能够使UHPC华夫板双向受力状态更加明显,材料利用率更高;纵横肋底部受拉钢筋直径和顶板厚度是影响UHPC华夫板刚度和承载力的主要因素。基于研究结果,对于跨度5~6 m的UHPC华夫板,建议采用3条纵肋与3~5条横肋的组合形式,且顶板厚度不超过100 mm。Ultra-high performance concrete(UHPC)waffle panels have the advantages of light weight,high stiffness and load-bearing capacity,and have good application prospects in projects such as large-span bridge decks and building roofs.Four UHPC waffle panels model with a 1∶2 scale were designed and completed for static loading tests,with a focus on exploring the crack resistance,stiffness,load-bearing capacity,and mechanical characters of the UHPC waffle panels under four point and four edge support boundary conditions,and different transverse rib spacing.A fine finite element model was established using ABAQUS to further study the influence of design parameters such as the reinforcement ratio,distribution of longitudinal and transverse ribs,top plane thickness and rib height on the mechanical performance of UHPC waffle panels,and to propose optimization design suggestions.The test results show that the UHPC waffle panels do not crack under the designed wheel load during the four point loading stage.During the single point loading stage,the four point supported waffle panels undergo bending failure,mainly bearing longitudinal force.The four edge supported waffle panel undergoes punching failure with a significant increase in stiffness and load-bearing capacity.Properly increasing the transverse rib spacing and reducing the number of transverse ribs can make the bidirectional stress state of the UHPC waffle panels more obvious and the material utilization rate higher.The diameter of the tensile reinforcement at the bottom of the longitudinal and transverse ribs and the top plane thickness are the main factors affecting the stiffness and load-bearing capacity of the UHPC waffle panels.Based on the research results,a combination of 3 longitudinal ribs and 3 to 5 transverse ribs is recommended for UHPC waffle panels with a span of 5 to 6 meters,and the top plane thickness does not exceed 100 mm.

关 键 词：超高性能混凝土 华夫板 支承条件 静力试验 有限元分析 受力性能 

分 类 号：TU375[建筑科学—结构工程] TU317.1TU311.41