大跨徑橋梁施工控制溫度應(yīng)力分析4P.pdf

針對(duì)大跨徑橋梁施工控制中結(jié)構(gòu)設(shè)計(jì)參數(shù)的變化能導(dǎo)致結(jié)構(gòu)內(nèi)力的變化和形狀的改變，以
及與時(shí)間有關(guān)的溫度參數(shù)不易確定的問(wèn)題，在分析了產(chǎn)生溫度應(yīng)力原因的基礎(chǔ)上，根據(jù)沿梁長(zhǎng)的溫
度分布是均勻的，略去斷面局部變化引起的梁體溫差分布的微小差別，按單向溫差荷載計(jì)算應(yīng)力等
基本假定，在給定溫度分布的前提下，提出了溫度應(yīng)力實(shí)用計(jì)算方法，并通過(guò)工程實(shí)例分析了溫度
應(yīng)力對(duì)橋梁施工控制的影響。
結(jié)果表明：考慮溫度影響的理論值與實(shí)測(cè)應(yīng)力值接近，為工程應(yīng)用提
供了理論依據(jù)。

The variation of the structural design param eters can lead tO the change of the internal
forces and the alteration of the shape in the control of the long—span bridge construction．Also，
the parameters relevant tO the tim e are not easy to be determined．A fter the analysis of the rea—
sons of bringing about temperature stress，the effective m eans of com putation can be put forward
if the distribution of temperature is given．During the course，the following basically presumptions
should be in accordance：the distribution of tem perature is uniform along the beam ；the m inute
variation of the tem perature distribution should be neglected w hich iS the result of the local chan—
ges of the beam cross section．The com putation of the tem perature stress should be according tO
the single direction load resulted by the difference of the tem perature． T he influence tO the con—
struction of bridges produced by the tem perature stress should be studied through the analysis of
the actual exam ples．The result show s that the theoretical values approach tO the actual value got
by test when the temperature influence is considered，which provides som e theoretical reference to
the bridge construction．