【摘要】：預(yù)應(yīng)力積成材是將膠合板材剖解成片狀單元,然后將片材垂直于板面排列,再由預(yù)應(yīng)力鋼絲將其貫穿、擠壓形成整體的一種新型結(jié)構(gòu)材料。本文應(yīng)用有限元軟件對其力學(xué)性能進行了分析研究。從簡支單板面內(nèi)受彎的承載力分析切入,通過改變構(gòu)件的幾何參數(shù)得出了單板內(nèi)力分布、破壞模式以及承載力的變化規(guī)律,然后分析了預(yù)應(yīng)力積成材的內(nèi)力分布和破壞模式,并且通過對預(yù)應(yīng)力大小、預(yù)應(yīng)力鋼絲的直徑及其縱向間距、預(yù)應(yīng)力鋼絲的上下邊距等參數(shù)的分析確定了極限承載力隨影響因素的變化規(guī)律。分析結(jié)果表明:單板構(gòu)件的高寬比越大,破壞模式越趨向于失穩(wěn)破壞,材料強度越不能得以充分發(fā)揮;通過預(yù)應(yīng)力鋼絲的合理選取與布置及預(yù)應(yīng)力的合理施加,分散的單板結(jié)合成一個共同受力和變形的整體,使預(yù)應(yīng)力積成材的承載力遠高于失穩(wěn)破壞時的極限承載力且稍高于等體積原木的承載力。最后提出了合理參數(shù)下積成材的分析模型。
[Abstract]:The prestressing product is a kind of new structural material, which divides the glued plate into a sheet element, then arranges the sheet perpendicular to the plate surface, then runs through it by the prestressed steel wire and extrudes it to form a whole structure material. In this paper, finite element software is used to analyze and study its mechanical properties. Based on the analysis of in-plane bending bearing capacity of simply supported single slab, the internal force distribution, failure mode and bearing capacity of single slab are obtained by changing the geometric parameters of the member, and then the internal force distribution and failure mode of prestressed composite material are analyzed. By analyzing the parameters such as the size of prestress, the diameter and longitudinal spacing of the prestressed steel wire, the upper and lower margins of the prestressed steel wire, the variation rule of the ultimate bearing capacity with the influence factors is determined. The results show that the higher the ratio of height to width is, the more unstable the failure mode is, and the less the strength of the material can be brought into full play. Through the reasonable selection and arrangement of the prestressed steel wire and the reasonable application of the prestressing force, the dispersed veneer is combined into a whole of common force and deformation. The bearing capacity of pre-stressed fabricated wood is much higher than that of unstability failure and slightly higher than that of equal volume log. Finally, the analytical model of the product under reasonable parameters is put forward.
【作者單位】： 中國核電工程有限公司;北京交通大學(xué);
【分類號】：TU59
，

本文編號：2435884