高强混凝土T型梁极限承载力计算与参数分析  

The Ultimate Bearing Capacity and Parameter Analysis of High-Strength Concrete T-Beam

作　　者：刘小燕[1] 颜东煌[1] 张峰[1] 魏洪昌[2] 王来永[2] 

机构地区：[1]长沙理工大学桥梁与结构工程学院,湖南长沙410076 [2]交通部公路科学研究所,北京100088

出　　处：《中国铁道科学》2006年第1期8-12,共5页China Railway Science

基　　金：交通部重点科技项目(95-04-05-38);西部交通建设科技项目(200131822358)

摘　　要：高强混凝土的强度和变形特性与普通混凝土的相比有较大差别。考虑高强混凝土材料非线性影响,采用三维8节点的加筋混凝土实体单元模拟钢筋混凝土的结构,进行预应力高强混凝土T型梁的全受力过程仿真分析。分析结果表明:预应力高强混凝土T型梁的受力全过程可以划分为预加力反拱、混凝土开裂、钢筋屈服、混凝土破坏4个阶段;T型梁达到极限承载力时的荷载—挠度曲线接近水平线。对影响预应力高强混凝土T型梁极限承载力的主要参数进行分析,给出不同标号高强混凝土T型梁的配筋率、高跨比及预应力度的建议值,并建议预应力高强混凝土T型梁设计成预应力钢筋少、张拉控制应力大、配置普通钢筋的“部分预应力混凝土”结构。Compared with common concrete, the strength and the deformation characteristics of highstrength concrete vary greatly from that of common concrete. Taking material non-linearity influence of high-strength concrete into consideration, 3D strengthened concrete solid elements with 8 nodes are adopted to simulate the structure of reinforced concrete and carry out the simulation analysis for the whole mechanical process of prestressed high-strength concrete. Analysis result indicates that the whole mechanical process of prestressed high-strength concrete T-beam can be divided into 4 stages, namely, pre-stressing anti-arching, concrete cracking, bar reinforcement yielding and concrete crashing. The load-deflection curve of T-beam upon reaching the ultimate bearing capacity is close to horizontal line. The main parameters affecting the ultimate bearing capacity of prestressed high-strength concrete T-beam are analyzed. The ratio of reinforcement bar, depth-span ratio and the level of prestressing force are suggested for highstrength concrete T-beam of different grades. It is suggested that the prestressed high-strength concrete T-beam should be designed as a “partial prestressed concrete” structure with ordinary reinforcement bar, less prestressed reinforcement bar and higher prestressing force.

关 键 词：高强混凝土 本构关系 非线性 T型梁 受力特性 

分 类 号：U448.212[建筑科学—桥梁与隧道工程] U214.18[交通运输工程—道路与铁道工程]