There has not been a scientific design theory about the jointless bridge whereas it has been conducted successfully for a long time in the u . s . the actual design ways basically depend on the experience and observaration . what is more , the analytical method and the design of the crunodal details are still dealed with on the whole . in fact , it is a very important part to deal with the crunodal structure between the abutment and beam in the design and conduction of the jointless bridge . in addition , the loaded properties of the crunode are the key and difficulty in the study of the jointless bridge . therefor , there are engineering and practical significances of analyzing the crunodal structure and studying its loaded properties 尽管无伸缩缝桥梁在美国已经成功地使用了很长时间，但至今还没有一个比较科学的设计理论。目前的设计方法基本上依赖于经验与观察，还没有从根本上解决无伸缩缝桥梁有关的分析方法和设计细部构造。应该说，对于无伸缩缝桥梁而言，处理台与主梁的结点构造是设计和施工中非常重要的部分，结点部分的受力性能是研究无伸缩缝桥梁的重点和难点。
This paper , in allusion to damage of expansion joint of bridge , introduces a sort of new structure of jointless device - semi - integral abutment jointless bridge , and establishes model of general structure finite element of this bridge , and in details analyses its qualities of stress . the model considers the interaction of superstructure - substructure - soil . resistance of the soil behind abutment adopts still soil pressure and elastic resistance when the temperature rising , but active soil pressure when dropping . analysis of qualities stress of bridge includes of action of dead load , car load , temperature load of season character . taking an 100m length pc semi - integral abutment jointless bridge as instance , the paper establishes the model of plane frame by applying large common software - anasys , and analyses it by elastane and large deformation to imitate character of stress and deformation of general bridge . at the same time corresponding models of finite element of joint bridge and integral abutment bridge are established , and unique stress and performance of structure of semi - integral abutment jointless bridge are researched by comparing and analysing character of three different models under same loading , and controlling factor of design and constitution are generalized . in conclusion , for semi - integral abutment jointless bridge , on one hand shear , moment and deflection of the main beam and axis force of substructure are approximate with that of joint bridge , and integral stifmess of structure is increased and damage of expansion joint is eliminated , on the other hand there is axis force in main beam , shear and moment of substructure are bigger than that of joint bridge . in all this type of jointless bridge has rational stress and is worth of application and popularization 半整体式桥台无缝桥梁计算模型考虑了上部结构-下部结构-土的共同作用；台后土抗力升温时采用静止土压力加弹性土抗力，降温时采用主动土压力；分析桥梁受力性能时考虑了结构自重、车辆荷载和季节性温变荷载的作用。以一座桥长100mpc半整体式桥台无缝桥梁为实例，采用大型通用软件ansys建立平面框架模型，进行弹性、大变形分析，模拟全桥受力和变形特点；同时建立与此对应的有伸缩缝桥梁和整体式桥台无缝桥梁有限元模型，通过三种桥型同步加载对比分析，研究半整体式桥台无缝桥梁独特的受力特点和结构性能，总结其设计控制因素和构造要求。通过本文研究知：半整体式桥台无缝桥梁主梁的剪力、弯矩、挠度和下部结构的轴力与梁式桥相近，结构整体刚度增大，并除去了伸缩缝病害；但主梁增加了轴力，下部结构剪力、弯矩较梁式桥大；综合分析是一种受力合理有实践和推广价值的桥型。
Influence of soil body behind the abutment stress distribution and stress carry - over length due to different coefficient of friction is analysised , through the experimental results and the space finite element analysis results of the model , actual measurement results tally with the computing results well . ( 4 ) new type semi - integral abutment bridge is from optimization design of conventional abutment bridge - dashuiting middle bridge . not only bridge at both ends 分析了不同摩阻系数对台后土体应力分布和应力传递长度的影响,并对试验结果和有限元分析进行了对比,实测结果和计算结果吻合良好; ( 4 )将有缝桥-大水町中桥优化设计为新型半整体式无缝桥,桥梁两端均不设伸缩缝,路面也不设任何接缝。
1 summarization at present , super - length tall buildings are ever - increasing by popular . expansion and contraction joint is not supposed to be located or at least frequently located in average buildings for the requirements of their functions . the longest space between two expansion and contraction joint , which is set in code for structural design is frequently exceeded in cast - in - place frame structure 目前超长高层建筑日见增多，由于功能以及使用上的需要，要求不设或少设伸缩缝，结构设计规范对现浇框架结构不设伸缩缝的最大间距的规定常常被突破，这就需要考虑温度对结构的影响。
