normal deflection 中文意思是什麼
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As soon as the normal section cracks, the crack firstly appears in the flexural region. at this moment, the load - deflection curve has a turning point. with the increase of the load, the rigidity of the beam decreases compared with that before cracking because of the development of cracks in flexural region, and the formation and development of diagonal cracks toward the loading point, the load - deflection curve is basically linear till the beam fails
正截面開裂前，荷載撓度曲線基本為線性，截面剛度較大；正截面開裂時，裂縫先在純彎段出現，荷載撓度曲線出現轉折點，隨著荷載的增加，純彎段正裂縫的發展以及剪跨段斜裂縫的產生並向梁的受壓區加荷點發展，使梁的剛度較截面開裂前減少，荷載撓度曲線也基本為線性直到梁破壞。 -
So the concrete beams reinforced with frps not only increase the flexural strength but also increase the stiffness and decrease it ' s max deflection, which is very important to increase the ability of resisting reflex of the original beams and the strength of the normal use limit status
因此，纖維加固混凝土構件不僅提高了其抗彎承載力，而且提高了其剛度，減小了最大撓度，這對于增加原梁抵抗變形的能力、提高正常使用極限狀態的承載能力具有十分重要的意義。 -
The deflection formula both used in classic rc theory and in rc code is correspond to service state. however after rc members strengthened with frp, the main rebar is under the post - yielding stage. therefore the normal deflection formula is not suitable for calculating the deflection of rc members strengthened with frp
但由於鋼筋混凝土構件加固后，受拉主筋一般都進入屈服階段，否則達不到加固效果；而經典鋼筋混凝土理論和我國規范中的計算公式都是針對構件處于正常使用狀態下的變形計算。
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