【摘要】：疲勞開(kāi)裂和鋪裝易損一直是大跨徑正交異性鋼橋面鋪裝面臨的兩大世界難題,為解決這兩個(gè)難題,作者所在團(tuán)隊(duì)提出了鋼橋面“CRRPC-TPO”超高性能輕型組合橋面鋪裝體系。本文旨在對(duì)該新型鋪裝體系的彎拉非線性全過(guò)程進(jìn)行分析,主要研究成果如下:(1)為進(jìn)行“鋼板-CRRPC-TPO”復(fù)合梁的彎拉非線性數(shù)值模擬,通過(guò)對(duì)材料各種本構(gòu)模型的分析與相關(guān)的試驗(yàn)研究,獲得了與該新型鋪裝結(jié)構(gòu)相符合的鋼材、RPC、TPO的應(yīng)力-應(yīng)變本構(gòu)方程;(2)考慮復(fù)合梁各組成材料的非線性本構(gòu)關(guān)系,根據(jù)內(nèi)力平衡條件,編制復(fù)合梁正截面的數(shù)值模擬計(jì)算分析程序,獲得了其彎矩-曲率關(guān)系曲線及荷載-撓度關(guān)系曲線;進(jìn)行復(fù)合梁試件的彎拉試驗(yàn),將試驗(yàn)所得荷載-撓度曲線與數(shù)值模擬的結(jié)果進(jìn)行對(duì)比,結(jié)果顯示數(shù)值仿真模擬荷載-撓度曲線與試驗(yàn)結(jié)果具有相同的發(fā)展規(guī)律,各特征點(diǎn)的數(shù)值吻合良好;(3)觀察復(fù)合梁彎拉試驗(yàn)過(guò)程中的變形全過(guò)程,測(cè)試其裂縫發(fā)展情況,結(jié)果表明:彈性階段復(fù)合梁各層材料處于彈性變形階段,無(wú)裂縫生成;裂縫穩(wěn)定擴(kuò)展階段CRRPC基體出現(xiàn)微裂縫;裂縫失穩(wěn)擴(kuò)展階段微裂縫失穩(wěn)擴(kuò)展為宏觀裂縫;復(fù)合梁破壞階段裂主裂縫兩端的CRRPC及TPO幾乎變成剛體轉(zhuǎn)動(dòng),裂縫寬度的記錄無(wú)實(shí)際意義;(4)建立馬房大橋的有限元局部模型進(jìn)行計(jì)算,并將計(jì)算結(jié)果與實(shí)際的檢測(cè)結(jié)果進(jìn)行了對(duì)比分析,結(jié)果表明兩者應(yīng)力值與變形值吻合良好,采用該有限元局部模型進(jìn)行計(jì)算得到的數(shù)據(jù)具有一定的參考意義;在此基礎(chǔ)上,建立本鋪裝結(jié)構(gòu)的有限元局部模型,采用規(guī)范荷載進(jìn)行數(shù)值計(jì)算,獲得了鋼橋面鋪裝層在車輪荷載作用下的最不利荷位及對(duì)應(yīng)的應(yīng)力值,CRRPC、TPO頂面的最大拉應(yīng)力分別為9.09Mpa、4.6Mpa;(5)采用材料力學(xué)的方法,對(duì)復(fù)合梁彎拉受力過(guò)程中的彈性階段進(jìn)行力學(xué)計(jì)算,得到鋪裝各層在彈性極限荷載作用下的最大應(yīng)力值,計(jì)算結(jié)果顯示CRRPC、TPO頂面最大拉應(yīng)力分別為有限元模型計(jì)算結(jié)果的3.11倍、2.9倍,證明了該新型鋪裝體系的可靠性,且具有足夠的安全儲(chǔ)備。
[Abstract]:Fatigue cracking and pavement vulnerability are the two major world problems faced by long-span orthotropic steel deck pavement. In order to solve these two problems, the authors put forward a lightweight deck pavement system with "CRRPC-TPO" ultra-high performance. The purpose of this paper is to analyze the nonlinear bending process of the new paving system. The main results are as follows: (1) in order to simulate the bending and tensile nonlinearity of "steel plate CRRPC-TPO" composite beam, The stress-strain constitutive equations of RPC-TPO in accordance with the new paving structure are obtained through the analysis of various constitutive models of materials and related experimental studies. (2) considering the nonlinear constitutive relations of the materials of composite beams, According to the equilibrium condition of internal force, the numerical simulation and analysis program of normal section of composite beam is compiled, the curve of moment curvature relation and load-deflection relation is obtained, and the bending and tensile test of composite beam is carried out. The load-deflection curve obtained from the test is compared with the results of numerical simulation. The results show that the load-deflection curve of numerical simulation has the same development law as the test result. (3) observing the whole deformation process of composite beam during bending and tensile test and testing the development of cracks. The results show that the materials of each layer of composite beam are in elastic deformation stage and no cracks are formed in elastic stage. Microcracks appeared in CRRPC matrix during stable crack propagation, microcracks spread to macro cracks in fracture instability propagation stage, CRRPC and TPO at both ends of main cracks of composite beams almost turned into rigid body rotation during failure stage. The recording of crack width has no practical significance. (4) the finite element local model of Mafang Bridge is established and the results are compared with the actual test results. The results show that the stress and deformation values agree well with each other. On the basis of this, the local finite element model of the pavement structure is established, and the numerical calculation is carried out by the code load. The maximum tensile stress of the top surface of CRRPC-TPO is 9.09 Mpa-4.6Mpa. (5) the mechanical calculation of elastic stage of composite beam during bending and tensile loading is carried out by the method of material mechanics, and the maximum tensile stress of the top surface of CRRPC-TPO is 9.09 Mpa-4.6Mpa.Using the method of material mechanics, the most unfavorable loading position and the corresponding stress value of steel bridge deck pavement under wheel load are obtained. The maximum stress of each layer of pavement under the action of elastic limit load is obtained. The calculation results show that the maximum tensile stress of the top surface of CRRPCO TPO is 3.11 times or 2.9 times of the calculated results of the finite element model, which proves the reliability of the new paving system. And has sufficient safety reserve.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U443.33

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