基于靜載試驗的橋梁安全性研究
發(fā)布時間：2018-08-26 16:02
【摘要】：作為交通樞紐，橋梁已經(jīng)成為各地區(qū)經(jīng)濟發(fā)展的紐帶，對經(jīng)濟的迅速增長起著至關(guān)重要的作用。根據(jù)中國交通部對橋梁情況的統(tǒng)計，在我國的橋梁中有部分是危橋，并且數(shù)目呈增長趨勢。如果不及時消除這些橋梁中的安全隱患，勢必將造成重大的人員與經(jīng)濟損失。因此，部分新建和正在建設(shè)中的橋梁，面臨著能否保證大橋安全運營所必要的安全性研究 本文選取邢汾高速小戈廖大橋右幅3-4號有粘結(jié)預(yù)應(yīng)力T梁與沙河大橋左幅33-2號有粘結(jié)預(yù)應(yīng)力箱梁作為試驗梁，在跨中進行3個循環(huán)的集中加載（3個加載循環(huán)的控制荷載分別為開裂狀態(tài)下的荷載、正常使用極限狀態(tài)下的荷載與極限承載能力狀態(tài)下的荷載），且對在3個循環(huán)分級加載過程中的撓度、殘余變位、應(yīng)變、應(yīng)力、開裂狀態(tài)以及裂縫寬度進行測量與分析，從而對橋梁的安全性作出評價；借助對有粘結(jié)預(yù)應(yīng)力混凝土T梁的試驗，對有粘結(jié)預(yù)應(yīng)力混凝土的損失進行分析；在分級加載過程中，預(yù)應(yīng)力鋼筋應(yīng)力增量由錨具、預(yù)應(yīng)力鋼筋與注漿后之間的粘結(jié)力共同傳遞給混凝土，，對二者承擔的比例進行分析研究。 研究結(jié)果表明：有粘結(jié)預(yù)應(yīng)力試驗T梁與有粘結(jié)預(yù)應(yīng)力試驗箱梁在開裂狀態(tài)下的抗裂性能，正常使用極限狀態(tài)下的剛度、裂縫寬度以及極限承載能力狀態(tài)下強度均可以滿足規(guī)范的要求，即：設(shè)計的預(yù)應(yīng)力混凝土T梁與預(yù)應(yīng)力混凝土箱梁的安全性可以保證；《公路鋼筋混凝土與預(yù)應(yīng)力混凝土橋梁設(shè)計規(guī)范》（JTG D62-2004）中規(guī)定的曲線布置預(yù)應(yīng)力鋼筋的有粘結(jié)預(yù)應(yīng)力筋預(yù)應(yīng)力損失的計算公式是實際損失的1.52倍；在分級加載過程中，有粘結(jié)預(yù)應(yīng)力混凝土結(jié)構(gòu)預(yù)應(yīng)力主要是由預(yù)應(yīng)力鋼筋與注漿后之間的粘結(jié)力傳遞給混凝土，由錨具傳遞給混凝土的部分可以忽略不計，在重復(fù)荷載作用下，若能保證可靠的注漿，錨具處預(yù)應(yīng)力鋼筋的疲勞破壞基本不可能發(fā)生。
[Abstract]:As a transportation hub, bridge has become the link of regional economic development and plays a vital role in the rapid economic growth. According to the statistics of China's Ministry of Communications, there are some dangerous bridges in our country, and the number of bridges is increasing. If the hidden dangers of these bridges are not eliminated in time, it will cause great loss of personnel and economy. As a result, some of the bridges that are being built and under construction, In the face of whether or not to ensure the safety of the bridge, this paper selects the bonded prestressed T-beam 3-4 on the right of Xingfen High-speed Xiaogoliao Bridge and the 33-2 bonded Prestressed Box girder on the left of Shahe Bridge as test beams. Three cycles of concentrated loading are carried out in the span (the control load of the three loading cycles is respectively the load under cracking condition, The deflection, residual displacement, strain, stress, crack state and crack width during three cycles of graded loading are measured and analyzed. Thus the safety of the bridge is evaluated, the loss of the bonded prestressed concrete is analyzed by means of the test of the bonded prestressed concrete T-beam, and the stress increment of the prestressed steel bar is increased by the anchor in the process of graded loading. The bond force between prestressed steel bar and grouting is transferred to concrete together, and the ratio between them is analyzed and studied. The results show that the crack resistance of the bonded prestressed test T beam and the bonded prestressed test box girder under cracking condition, and the stiffness under the limit condition of normal use are obtained. The crack width and the strength under the condition of ultimate bearing capacity can meet the requirements of the code, that is, the security of the prestressed concrete T-beam and the prestressed concrete box girder can be guaranteed; The formula for calculating the prestress loss of bonded prestressed tendons in curved arrangement of prestressed steel bars specified in the Code for Design of Highway reinforced concrete and Prestressed concrete Bridges (JTG D62-2004) is 1.52 times of the actual loss. The prestress of bonded prestressed concrete structure is mainly transferred to concrete by the bond force between prestressed steel bar and grouting, and the part transferred from anchor to concrete can be ignored, under the action of repeated load, If reliable grouting can be guaranteed, fatigue failure of prestressed steel bar at Anchorage is impossible.
【學位授予單位】：河北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U446;U447
本文編號：2205422
[Abstract]:As a transportation hub, bridge has become the link of regional economic development and plays a vital role in the rapid economic growth. According to the statistics of China's Ministry of Communications, there are some dangerous bridges in our country, and the number of bridges is increasing. If the hidden dangers of these bridges are not eliminated in time, it will cause great loss of personnel and economy. As a result, some of the bridges that are being built and under construction, In the face of whether or not to ensure the safety of the bridge, this paper selects the bonded prestressed T-beam 3-4 on the right of Xingfen High-speed Xiaogoliao Bridge and the 33-2 bonded Prestressed Box girder on the left of Shahe Bridge as test beams. Three cycles of concentrated loading are carried out in the span (the control load of the three loading cycles is respectively the load under cracking condition, The deflection, residual displacement, strain, stress, crack state and crack width during three cycles of graded loading are measured and analyzed. Thus the safety of the bridge is evaluated, the loss of the bonded prestressed concrete is analyzed by means of the test of the bonded prestressed concrete T-beam, and the stress increment of the prestressed steel bar is increased by the anchor in the process of graded loading. The bond force between prestressed steel bar and grouting is transferred to concrete together, and the ratio between them is analyzed and studied. The results show that the crack resistance of the bonded prestressed test T beam and the bonded prestressed test box girder under cracking condition, and the stiffness under the limit condition of normal use are obtained. The crack width and the strength under the condition of ultimate bearing capacity can meet the requirements of the code, that is, the security of the prestressed concrete T-beam and the prestressed concrete box girder can be guaranteed; The formula for calculating the prestress loss of bonded prestressed tendons in curved arrangement of prestressed steel bars specified in the Code for Design of Highway reinforced concrete and Prestressed concrete Bridges (JTG D62-2004) is 1.52 times of the actual loss. The prestress of bonded prestressed concrete structure is mainly transferred to concrete by the bond force between prestressed steel bar and grouting, and the part transferred from anchor to concrete can be ignored, under the action of repeated load, If reliable grouting can be guaranteed, fatigue failure of prestressed steel bar at Anchorage is impossible.
【學位授予單位】：河北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U446;U447
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本文編號：2205422
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