考虑转动约束的宽支座连续梁计算方法

Calculation method of continuous beam with wide supports considering rotational restraint

针对现有JTS 167-1—2018《码头结构设计规范》大桩帽轨道梁宽支座计算方法的不足,提出带转动约束的宽支座连续梁计算模型,推导了宽支座转动刚性系数计算公式;运用Fortran语言对带转动约束的宽支座连续梁模型编写有限元程序,并通过ANSYS软件建立纵向排架的空间有限元模型作为对比分析,得出不同计算模型下的连续梁内力。计算结果表明,在均布荷载情况下,忽略支座转动约束会对计算宽支座连续梁最大正弯矩带来较大的误差,考虑转动约束的宽支座连续梁模型计算所得最大正弯矩与空间模型比较接近;而规范方法与本文提出的计算模型所得梁最大负弯矩与空间模型差别均较大,对其原因进行分析并提出改进建议,以供类似码头结构设计参考。

According to the deficiency of wide support calculation methods for crane girder of big pile cap in Design and Construction Code for Open Type Wharf on Piles(JTS 167-1—2018),this paper puts forward a calculation model of the continuous beam with wide supports considering rotational restraint and derives a formula for rotational stiffness coefficient of wide supports.It programs the finite element program of the model by using Fortran language,establishes the space finite element model of the longitudinal bent through ANSYS software for comparative analysis,and obtains the internal force of the continuous beam under different calculation models.The calculation results show that under the condition of uniformly distributed load,ignoring rotational restraint to a continuous beam with wide supports will produce larger errors in the maximum positive moment,and the maximum positive moment obtained by the model of the continuous beam with wide supports considering rotational restraint agrees well with the space model.The maximum negative moments calculated by the method in the code and the proposed model in this paper both have a larger difference from the space model.Therefore,this paper analyzes the reasons and puts forward suggestions for improvement,so as to provide a reference for similar wharf structure design.