装配式预应力混凝土T梁极限承载力试验研究  

Experimental study on failure mechanism of prestressed concrete T girder

作　　者：王城泉[1] 申永刚[2] 杨润芳 邹昀[1] 

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122 [2]浙江大学土木工程学系,浙江杭州310058

出　　处：《铁道科学与工程学报》2017年第11期2369-2376,共8页Journal of Railway Science and Engineering

基　　金：浙江省自然科学基金资助项目(LY16E080006);国家自然科学基金资助项目(15378240)

摘　　要：通过对一片跨径20 m装配式预应力混凝土T梁的破坏性加载试验,详细探究预应力混凝土T梁由弹性阶段经过弹塑性阶段最后达到极限状态过程中的挠度、刚度以及跨中截面应变的变化,并对其中的现象和规律进行分析与总结,验证平截面假定在预应力混凝土T梁整个受力过程中的适用性并提出根据混凝土T梁中性轴位置和跨中截面极限应变推测梁承载力的简易方法。研究结果表明:大跨度装配式预应力混凝土T梁的力学性能、受力机理、弹塑性性能及极限承载力等基本受力特性,得到荷载与T梁的挠度、应力、中性轴等参数之间的相关关系,为预测T梁桥的极限承载能力提供理论依据。This paper presents the results of an experimental and analytical study on the failure behavior of a newprecast prestressed concrete T girder. The mid-span deflection, girder stiffness and the variation of the crosssection strain in the loading process were obtained. The applicability of plane section assumption in the wholestress process of prestressed concrete T girder was verified. A method was proposed to predict the residual bearingcapacity of a bridge based on the variation of the position of the cross section strain distribution and the sectionneutral axis. The mechanical properties, mechanical behavior, elastic and plastic behavior and ultimate bearingcapacity of T girder with large span were revealed. The relationships between the load and the deflection, thestress and the neutral axis of the T girder were investigated in this paper, which provides a theoretical basis forpredicting the ultimate bearing capacity of the T girder bridge.

关 键 词：装配式预应力混凝土T梁 极限承载力试验 混凝土应变 平截面假定 极限承载力 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]