无受力配筋轻骨料型钢混凝土柱正截面计算理论探讨

通过计算,探讨了无配筋型钢混凝土柱正截面承载力的设计方法。

单进路采场充填假顶力学行为数值分析

为分析研究单进路采场充填假顶在暴露过程中的力学行为与发展特征,以及内部配筋的受力状态,以某矿山急倾斜薄矿体下向分层进路充填采矿法形成的充填假顶为工程实例,结合实际建立标准化三维模型,采用有限差分法分析软件进行数值模拟计算。结果表明:回采水平越深采场主应力越大,其中充填通风小井靠近上盘的井壁处受拉应力较为明显,在矿房边界外5~10 m范围内存在一定的压应力集中现象;顶板最大位移并不位于几何中心,越靠近上下盘边界位移变形量越大;吊筋所在位置顶板暴露前后受力状态由受压转变为受拉,底筋受力状态并不单一受拉,呈拉压交错复杂状态。

预应力先张法张拉台座设置探讨

先张法张拉台座是先张法预制场重要组成部分,张拉台座设置必需具有足够的强度和稳定性,既安全又经济合理。结合宿淮高速公路泗阳东接线京杭运河大桥引桥空心板梁先张法临时预制场成功实例,介绍预制场总体布局、张拉台座整体设置、张拉台座受力分析、配筋以及运营过程中的质量监控方法。

预应力先张法张拉台座设置

先张法张拉台座是先张法预制场主要组成部分 ,张拉台座设置必需具有足够的强度和稳定性 ,安全而且经济合理。结合宁波市机场公路k 2 +894 5 0联丰立交桥先张法临时预制场成功运营生产经验 ,详细的介绍了本预制场总体布局、张拉台座整体设置、张拉台座受力分析、配筋以及运营过程中的质量监控方法。

Investigation of Bed Joint Reinforcement Influence on Mechanical Properties of Masonry under Compression

The results of investigations of compressed reinforced masonry walls subjected to axial compression are presented. Tests were carried out using specimens made of clay bricks and cement-lime mortar. As reinforcement, smooth and spiral twisted longitudinal rods, two types of structural wire mesh and truss type reinforcement were used. Two percentages of bed joint reinforcement, about 0.1% and 0.05% were applied. For each type of reinforcement, three masonry walls were tested. Additionally, nine unreinforced models were also tested. The main aim of the investigations presented is to determine the effect of different types of reinforcement on the load capacity and failure. Measurement of the strains of reinforcing bars permitted the recording of the strain level at the moment of crack appearance and also at the moment of failure.

平衡式预应力先张法张拉台座设置

先张拉台座设置必需具有足够的强度和稳定性、安全而且经济合理。文章综合永漳线K18+718等3座中桥预应力空心板梁先张法临时预制场成功运营生产经验,详细介绍平衡式张拉台座整体设置,张拉台座受力分析、配筋以及运营过程中的质量控制方法。