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首页> 外文期刊>PCI Journal >Comparison of the design of prestressed concrete hollow-core floor units with Eurocode 2 and ACI 318
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Comparison of the design of prestressed concrete hollow-core floor units with Eurocode 2 and ACI 318

机译：欧元建2和ACI 318比较预应力混凝土空心芯楼层装置的比较

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A typical 1200 mm (48 in.) wide x 200 mm (8 in.) deep prestressed concrete hollow-core unit is analyzed and designed in order to make a comparison between Eurocode 2 and ACI 318-08. This includes calculations for serviceability limit state of stress and moment of resistance, ultimate moment of resistance, ultimate shear capacities, flexural stiffness (that is, for deflection), and cover to pretensioning tendons for conditions of environmental exposure and fire resistance. Concrete cylinder strength is 40 MPa (5.8 ksi), and concrete cube strength is 50 MPa (7.3 ksi). The hollow-core unit is pretensioned using seven-wire helical strands. Worked examples are presented in parallel formation according to Eurocode 2 and ACI 318.For uniformly distributed loads, the design criterion between the service moment to service moment of resistance (M-s/M-sr for EC2 and M-s/M-sn for ACI 318) and the ultimate design bending moment to ultimate moment of resistance (M-Ed/M-Rd for EC2 and M-u/phi M-n for ACI 318) is well balanced for this example. Usually the service moment is critical unless the amount of prestress is small. For EC2-1-1, flexurally uncracked shear capacity V-Rd,V-c is only limiting when the span-to-depth ratio in this example is less than about 35. For ACI 318, flexurally cracked shear capacity phi V-ci is limiting when span-to-depth ratio is 42, showing that shear cracked in flexure will often be the governing criterion.
机译：分析和设计典型的1200毫米（48英寸）宽x 200mm（8英寸）深预应力混凝土空心核心单元，以便在欧元展2和ACI 318-08之间进行比较。这包括用于可靠性限制的计算应力和电阻力矩，抗性的最终力矩，最终剪切容量，弯曲刚度（即，用于偏转），并覆盖环境暴露和耐火性条件的预张紧肌腱。混凝土圆筒强度为40 MPa（5.8 ksi），混凝土立方体强度为50 MPa（7.3 ksi）。空心芯单元使用七线螺旋股来预张紧。根据Eurocode 2和ACI 318，在平行地层中呈现了工作示例。对于均匀分布的负载，服务时刻与AC2和ACI 318的MS / M-SR的MS / M-SR之间的设计标准而最终的设计弯曲力矩到最终阻力矩（用于EC2和ACI 318的EC2和MU / PHI MN的M-ED / M-RD）对于该示例非常平衡。通常服务时刻是至关重要的，除非预应力的数量很小。对于EC2-1-1，柔性剪切剪切容量V-Rd，VC仅限于该示例中的跨度到约35.对于ACI 318，柔性裂纹剪切容量PHI V-CI是限制性的当跨度到深度比为42时，显示在弯曲中裂缝的剪切通常是控制标准。

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