钢筋混凝土梁体剪跨比取值方法及其在施工中的运用

钢筋混凝土梁设计中,集中荷载作用下的梁体抗剪性能计算是一个较基础的问题,其中剪跨比对梁的抗剪强度影响较为突出,但是由于既有规范仅对计算模型进行了定义,未对实体梁取值做严格界定,导致实际设计工作中无法进行标准化统一设计,同时,由于一些不当的取值也会对结构安全造成一定影响。针对部分工程实际应用,对剪跨比取值进行了相关探讨,同时结合梁体支点的分析,对施工现场钢筋绑扎容易出现的“空箍节点”现象进行了讨论。

Discussion about the Value of Ratio of Axial Compressive Force to Axial Compressive Ultimate Capacity of Section on ReinforceConcrete Beam

In the design of reinforced concrete beam,computation about properties of shear resistance on beam which is acted by concentrated load is an essential problem, and especially the effect on the shearing strength of the beam by the ratio of axial compressive force to axial compressive ultimate capacity is very strong.But in the criterion,only computational model is defined,while the value of about idiographic beam is not strictly stipulated,which results in different understanding in practce and makes standardized design imposible.At the same time,some mistaken values might affect the structure safety.This article makes some discusses about ratio of axial compressive force to axial compressive ultimate capacity on some projects,suggests that the fulcrum be confirmed through theoretical computation on beam,and then the value of ratio of axial compressive force to axial compressive ultimate capacity be unified.