With the development and construction of freeways , large amount of bridges are being built . high - speed driving demands good continuity and less expansion joints of the bridges 高速公路的迅速发展使得桥梁的数量大幅度增加，而高速度的行车则要求桥梁具有较好的连续性能、较少的伸缩缝构造等。
Most modified asphalt bridge expansion joints existed cracks because of low temperature when they applied in cold areas . between the bituminous mixture and bridge , the cracks existed also 改性沥青桥梁伸缩缝在寒冷地区应用时，由于低温作用普遍开裂，而且填缝料与桥梁梁端连接处存在界面裂缝。
The whole system is supported by the main jack arrangement when concreting , placed at the front supporting bracket and the ( rear ) suspension gallows ? or on supporting brackets only at the start and expansion joint spans 整个系统在混凝土浇注过程中由前牛腿及（后）吊架上主千斤顶系统支撑，在起始段和伸缩缝处则在前后牛腿处支撑。
D 、 the seismic response of jointless bridge were examined by spectrum analysis as well as transient dynamic analysis . e 、 the modes of a whole concrete model of jointless bridge by modes test , at the same time , the accuracy of finite element modeling and analysis was proved by it 5 、对无伸缩缝桥按比例缩放的全桥模型进行实验，测出结构的动力特性（固有频率、振型、周期等） ，验证有限元建模和分析的精确度
This paper focuses on the analysis of dynamic characteristic and anti - seismic behavior of structure for above situation . the main contents of the paper are describes as follows : a 、 it is important to simulate soil - structure interaction for this paper 针对上述情况，本文开展了整体式桥台无伸缩缝桥梁的动力特性分析和地震反应分析，主要做了以下工作： 1 、本文的首要工作是解决土体结构相互作用的模拟问题。
With the development of the techniques for seismic mitigation and isolation , the fluid viscous dampers are usually equipped at the girder ends of long - span bridges in case the girder ends need to be restricted due to great amount of girder movement or the costly large expansion joints at the girder ends need to be protected 摘要随着减隔震技术的发展，在大跨度桥梁中，当梁端位移比较大需要限制位移（或梁端设置有价格高昂的大型伸缩缝，需要保护伸缩缝）时，梁端会设置阻尼器。
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。
To restrict the displacement at stiffening girder ends under action of earthquake and to ensure that the girders will not cause too fast movement speed towards the expansion joints lest the joints should be damaged , the constraint devices are intended to provide for the girder ends of xihoumen bridge , the zhoushan mainland and islands link project 摘要为限制地震作用下加劲梁的梁端位移以及使梁体不对伸缩缝作用过大的速度以免损害伸缩缝，计划对舟山大陆连岛工程西堠门大桥设置梁端约束装置。
The pc rigid frame bridge can meet with the carrying capacity of long span bridge . this kind of structure is fit for the comfortable steer with no other expansion joints except for those at the two ends . it characterized the wholeness of structure , good astigmatic ability and load - bearing ability , construction rapidness , bright and pithiness bridge style , easy to maintain and convenient for segmental construction using the cantilever technique , so rigid frame bridge have taken an increasingly great proportion in bridges constructed and those under construction at city and county 刚构桥能满足特大跨径桥梁的受力要求，除两端以外无其他伸缩缝，有利于行车平顺舒适，具有结构整体性能好、抗震能力强、承载能力强、施工快捷、桥体简洁明快、维护方便和便于悬臂施工等结构特点，因而在城乡已建和在建的桥梁中占据了越来越大的比重。
Jointless bridges that use integral abutment is popular abroad ， while there are few examples of it and correlative reports at home . there are few complete analysis of dynamic characteristic and anti - seismic behavior of structure because it is a classic example of a soil - structure interaction system and the mainly unsolved problem in dynamic analysis is how to handling soil - structure interaction 目前，尚少有报道指出对具体的实桥进行过完整的动力特性分析和抗震分析，主要原因是因为整体式桥台的无伸缩缝桥梁是土体结构相互作用方面的典型例子，如何处理好土体结构相互作用是其动力分析的关键问题。
