The modified perry - robertson equation is applied to calculate ultimate compressive strength of damaged stiffened panels founded on so - called beam - column method , and the width of effective plate adopts above reduced effective width of a damaged plate 在進(jìn)行受損加筋板格極限強(qiáng)度計(jì)算時(shí),按梁柱法采用修正的perry - robertson方程進(jìn)行計(jì)算,其中有效帶板的寬度取板格折減后的有效寬度。
Simple design formula on the ultimate compressive strength of gusset plate connections to slotted tubes is presented basing on the results of finite - element study . it has bigness significance to perfect design formula of gusset plate connections to 本文根據(jù)有限元分析的結(jié)果,提出管板節(jié)點(diǎn)計(jì)算的簡化公式,為管板節(jié)點(diǎn)極限承載力設(shè)計(jì)計(jì)算公式的進(jìn)一步完善提供了有意義的參考,同時(shí)對實(shí)際工程也有一定的參考價(jià)值。
When the stress acted on concrete specimens exceed 60 % of ultimate compressive strength , the coefficient ( k ) will increase obviously but the largest change is still within the order of 10 - 9 cm / s . the time - dependant characteristic can be expressed by the function k = ( a + ct ) / ( l + bt ) . the coefficient k decreased significantly in the first 40 ~ 60 hours of the water permeability test , and the decreasing rate became slow as the time goes on 混凝土的滲透穩(wěn)定性則表現(xiàn)為滲透系數(shù)會隨滲透時(shí)間增加而減小,減小的趨勢是起初的40 60小時(shí)內(nèi)下降最快,其后愈來愈平緩,其規(guī)律可用公式k = ( a + ct ) ( 1 + bt )來表示。