Comparing with the same category overseas jointless bridges , the new type bridge has more reasonable structure , more simple and convenient construction , and better use effect etc . the main work in this paper is described as follows : ( 1 ) this paper introduces phylogeny and reseach survey of the joints bridge inland and abroad , and a new jointless bridge structure ? new type semi - integral abutment bridge is based on these , which characteristic of own structure and setting of primary component are expatiated . ( 2 ) this paper analyses influence of temperature effect , creep , shrinkage and circumambient soil of run - on slab on the new type structure , and analyses the forcing performance of beam , abutment and run - on slab of the new type semi - integral abutment bridge , and constrast to the same category joints bridges 本文主要做了以下工作: ( 1 )介绍了无缝桥梁在国内外的发展历史、研究概况,并在此基础上提出了一种新的无缝桥梁结构形式-新型半整体式无缝桥梁,阐述了它特有的结构形式以及主要构件的设置; ( 2 )分析了温度效应、徐变和收缩以及搭板周围土体对这种新型结构的影响,对新型半整体式无缝桥主梁、桥台以及搭板进行了受力性能分析,并和同类无缝桥梁进行了对比分析。
New type semi - integral abutment bridge cancels expansion joints ( including the expansion joints between end beam and abutment ) , and shifts away the beam thermal movements to the end of the run - on slab , which are absorbed by soil body of definite length range behind the abutment 新型半整体式无缝桥取消了全桥伸缩缝(包括梁端和桥台之间的伸缩缝) ,将主梁、桥台和搭板紧密相连,采用斜置搭板,将梁体变形延至搭板末端,通过台后一定长度范围的土体来吸纳桥梁的伸缩变形。
Interaction of run - on slab and soil is simulated by “ m ” method , run - on slab is constrained by soil through the vertival and horizontal , advances computing model of new type semi - integral abutment bridge . ( 3 ) this paper takes hengyang dashuiting middle bridge for test supporting project , designs full scale model test which can reflect truly interaction of beam , run - on slab and the embankment behind the abutment of new type semi - integral abutment bridge 通过“ ”法来模拟搭板与土体之间的相互作用,用竖向弹簧和水平弹簧来实现土体对搭板的约束作用,建立了新型半整体式无缝桥梁的计算模型; ( 3 )以衡阳大水町中桥为试验依托工程,设计了能真实反映新型半整体式无缝桥主梁、搭板以及台后填土相互作用的足尺模型试验。
