边腹孔的边界条件对主拱圈内力的影响分析

拱桥引起水平推力较大,在地质较好的西南地区得到发展。空腹式拱桥的腹孔和主拱圈的联合作用对主拱圈的受力影响很大,影响主要体现在腹孔的边界条件。

带腹板开洞组合梁的非线性计算

介绍了一带腹板开洞组合试验梁的模拟计算及计算结果。该模拟计算取得了与试验实测值吻合性很好的计算结果,除此之外,模拟计算还提供了一些其它有用的计算结果,从这些结果中,人们可以很直观地认识该类梁的一些受力特性。

城市立交桥——异型平板桥设计

本文介绍了异型平板桥的设计计算方法 ,推导了配筋弯矩的计算公式 。

Motion Track Modeling and Analysis of Belt Spindle under Combined Effects of Bending Moment-Torque-Thermal Deformation

The motion track of belt spindle is important for the radial error of belt spindle. An analytical modeling method for the motion track of belt spindle under the combined effects of bending moment-torque-thermal deformation is proposed in this paper. Three running phases of belt spindle have been analyzed and modeled: the start-up phase with leaping change due to the change in force and bending moment, the accelerating phase with axis deflection, and the constant speed phase with axis regression because of the combined effects of bending moment-torque-thermal deformation. The simulation and test were completed on the belt spindle of SKVM850 machine tool, which illustrates the variation law of the radial error of belt spindle during the whole running phases.

考虑扭矩影响的四边简支矩形板内力分析及配筋修正

混凝土四边简支矩形板一般是基于弹性薄板小挠度理论求出跨中弯矩布置板底钢筋,支座设置构造钢筋。该文基于弹性薄板小挠度理论,求解了板内扭矩分布。由分析可知,四边简支矩形板内具有复杂的扭矩分布,特别在角部部位其扭矩值将接近板的跨中正弯矩,由扭矩合成的主弯矩将使板角开裂。按照现行规范,仅在四边简支矩形板支座设置构造配筋是不合理的,无法满足抗扭需要,必须在角部配置受力钢筋。通过对比四边简支板与固支板沿对角线方向主弯矩的差异,指出边梁约束对板角混凝土开裂的缓解作用;该文揭示了目前混凝土简支楼板设计存在的不足,并对双向板、单向板合理设计提出了不同建议。