When analyzing skew support continuous curved box girder bridge , curved grid girder analyzing method considering warping effect is applied . matrix displacement method is applied in analyzing skew support continuous curved thin - walled box girder bridge with restrained bearing . in order to convert original rigidity equations to structural rigidi ty equations that can be solved , bearing nodal displacement matrix can be introduced , then unknown quantities at the edge of beams can be consistent with the restrained directions of skew bearings , unit rigidity matrix and unit nodal forces can be gained . structural rigidity matrix can be composed according to matrix displacement method , so nodal displacements and inner forces on the end of the rod that are unknown can be gained calculating equations of inner forces on any cross - section can be solved 分析斜支承连续曲线箱梁桥时，采用考虑翘曲作用的曲线格子梁分析方法，应用矩阵位移法对具有约束支承形式的斜支承连续曲线薄壁箱梁桥进行分析，考虑到支座的约束条件并不与梁端弯曲角位移和扭转角位移的方向一致，引入支座节点坐标矩阵，使得梁端的位移未知量与斜支座约束方向一致，来计算单元刚度矩阵和单元节点力，然后按照矩阵位移法组集总刚并建立结构刚度方程，根据结构刚度方程即可求解未知的节点位移及杆端力，推导出任意截面处的内力计算公式。
In recent years , during the detection of the established reinforced concrete or the prestressed concrete box girder bridges etc . the large structures , we can find that the concrete in particular structural positions such as the anchorage zones of prestressed reinforcement with dense reinforcement , the prestressed pipe in which the space of reinforcement or the thickness of concrete cover is small , the top and bottom flange of box girder and so on has brought great difficulty to concrete construction because of the small size and densely - packed reinforcement 对于变截面t梁、工字梁、箱梁等常见结构,截面形式复杂,一些部位尺寸较小且密集配筋,如梁顶板,梁底板,预应力管道间,混凝土不可避免的造成不密实导致耐久性降低,而这些问题往往为设计者所忽略。对于新建桥梁混凝土的密实度问题,尤其是新建桥梁关键部位的混凝土密实度和耐久性问题,人们研究和关心的较少,这也为桥梁的质量监督控制和使用寿命埋下了隐患。
