新型装配式梁柱节点耗能钢筋的抗震性能研究

文章提出了一种新型预压装配式梁柱节点,为改善目前装配式节点耗能性能不足的问题,在节点梁上部设置贯穿梁柱交界面的耗能钢筋,为节点提供额外的耗能性能。但耗能钢筋对节点抗震性能的影响尚不明确,不能达到指导施工的地步。基于此,文章通过实际试验与有限元模拟分析来探究耗能钢筋对此新型节点抗震性能的影响,为实际设计施工提供相关建议。

悬索桥主索鞍的关键铸造技术

西安市建材北路跨灞河桥为第十四届全运会重要交通通道,该桥主桥为主跨300 m钢塔钢箱梁空间自锚悬索桥。为了克服空间缆在塔顶处由主缆产生的水平分力对塔产生的附加应力,该桥主索鞍采用了一鞍双槽的设计理念。采用整体式索鞍,主索鞍设计两个对称鞍槽,增强了索鞍对水平分力的承载能力。该桥主索鞍的外形尺寸为7.5 m×5.6 m×4.8 m,边跨鞍体鞍体重量达到126 t,主跨鞍体重量为119 t。针对该桥主索鞍重量和体积大、造型复杂的特点,研究主索鞍鞍体铸造方案、铸造工艺流程、机加工和试装配等关键技术工艺,对铸造过程的难点、重点进行分析。通过采取相应的工艺控制措施,取得了优良的产品质量。该桥主索鞍加工铸造后,各项技术指标均满足设计和规范要求。

怎样选购燃烧室镶块

195等型号柴油机的燃烧室镶块损坏后,选购新件时必须谨慎小心。因为目前农机配件市场上仍然存在着不少质量低劣的零配件。如何才能选购到合格的镶块,笔者根据多年从事农机维修工作的实践经验,提出几点看法供参考。

Experimental and analytical studies on the deformability of a precast RC shear wall involving bolted connections

To study the deformability and ductility of an innovative precast shear wall joined by bolted connections,experimental tests were conducted on two test walls under monotonic and cyclic loading,respectively;subsequently,theoretical analysis was performed on the deformation performance of the shear wall assembly.The test results confirmed the favorable deformability and ductility of the specimens.The top displacement of the shear wall assembly was analytically decomposed into several constituent parts,the theoretical formulae of which were subsequently deduced.The compositional analysis demonstrated that the top displacement of the test wall was primarily induced by the elastic deformation of the upper wall panel(UWP),the relative slippages within the bolted connections,and the flexural deformation within the plastic region of the UWP,while the constituent part contributed by the deformation in the connecting steel frame can be neglected.