【摘要】 以破碎岩质边坡为例,采用节点荷载分配法计算了锚索锚固力在格构梁纵、横梁之间的分配比率,然后基于Winkler弹性地基模型和弹性半空间地基模型分别计算格构梁在张拉阶段的内力,并与采用简化的地基反力计算值对比;采用朗肯土压力理论近似计算在工作阶段主动岩体压力,将地梁视为在线性分布力作用下倒置于坡面上的连续梁,按力矩分配法计算地梁内力,取两阶段计算平均值进行配筋。通过对比分析理论计算最大值、采用简化的地基反力计算值和实测值,结果表明采用两阶段设计能较好地反应格构梁的实际受力情况,且设计安全,而简化的地基反力为手工计算带来了方便。这对工程中预应力锚索格构梁复合结构的设计计算具有一定的参考价值。更多还原

【Abstract】 In combination with the crushed rock slope as an example,the allocation of an anchorage force on longitudinal beams and transverse beams is calculated by adopting the distribution coefficient law of the nodal form at first.Then the internal forces of the lattice beam are calculated respectively through the software on the basis of Winkler elastic foundation model and the semi-infinite foundation model,and then compared with the internal forces which are based on simplified foundation pressure calculation.The active pressure of rock is calculated approximately by Ranking soil pressure theory in the working stage.Sequentially,the reinforcing bars are disposed by two-stage’s averagely calculated values.Through comparing the calculated values with experimented results,the research result indicates that the actual situation of the lattice beam can be well reflected by using two stages.Moreover,the simplified foundation pressure is of benefit to the hand labor calculation.It is of referential value for the design of complex structure of prestressed anchor-cable and lattice beam.更多还原