本文選題：鋼絲繩網片 + 聚合物砂漿�。� 參考：《北京建筑大學》2017年碩士論文

【摘要】：近些年來身邊發(fā)生的爆炸事件屢見不鮮,包括小區(qū)住宅內遇到的燃氣管道爆炸及住宅附近發(fā)生的危險品倉庫爆炸,也包括極端分子對人群密集的公共建筑進行的恐怖爆炸襲擊,造成大量的人員傷亡。隨著恐怖襲擊爆炸事件和意外爆炸事件的不斷增多,爆炸安全防護問題也顯得越來越突出。鋼筋混凝土(RC)板作為建筑結構中重要的受力構件,其抗爆炸沖擊水平對整個建筑結構的爆炸安全具有關鍵作用。因此,為了提高重要建筑結構的抗爆設計水平,需要對RC板進行抗爆加固設計。當前,可以通過粘鋼、包鋼、粘貼FRP等加固設計方法來提高原有RC板的抗爆性能,但是由于上述加固方法中均涉及有機結構膠的使用,影響其在爆炸產生的高溫環(huán)境中的應用。高強鋼絲繩網片-聚合物砂漿加固技術是一種新型的加固技術,與傳統的加固措施相比,有較好的耐火性、耐腐蝕性和耐久性,并且已經在建筑結構與橋梁抗震加固中得到廣泛應用,但對于該項加固技術在抗爆防護領域的適用性沒有相關研究。因此,探究在爆炸荷載作用下高強鋼絲繩網片-聚合物砂漿加固鋼筋混凝土板的抗爆性能具有重要意義。本文先通過數值模擬的方式探究了在爆炸荷載作用下高強鋼絲繩網片-聚合物砂漿加固鋼筋混凝土板的抗爆性能,在驗證模擬結果有效性的基礎上,運用有限元軟件ANSYS/LS-DYNA建立了與試驗相關的有限元模型,考慮的因素有炸藥量的大小和單面加固及雙面加固的影響,同時進一步分析了加固參數砂漿強度、砂漿厚度、鋼絲繩間距對加固效果的影響,為爆炸試驗做好前期準備。之后,對7塊不同加固參數下鋼筋混凝土板進行了爆炸試驗,對比分析了加固板與未加固板的試驗結果,試驗考慮的加固因素有砂漿強度、鋼絲繩間距、鋼絲繩預應力和銷釘,并從構件的破壞形態(tài)、裂縫發(fā)展、鋼筋的應力應變、位移時程曲線等方面進行了比較。論文主要研究結論如下:(1)應用有限元軟件LS-DYNA數值模擬了鋼筋混凝土板在爆炸荷載作用下的動態(tài)性能,首先驗證了所建有限元模型及所選用材料性質的合理性和有效性,然后對各項參數進行了詳細地分析比較,模擬結果表明:雙面加固的加固效果和抗爆性能要優(yōu)于單面加固;而且還發(fā)現砂漿加固層厚度和砂漿強度對鋼筋混凝土板的加固效果影響比較顯著。(2)根據試驗現象和數據可以看出,高強鋼絲繩網片-聚合物砂漿加固鋼筋混凝土板的抗爆效果非常顯著,板的破壞程度明顯減輕。在比例距離分別為0.94 m/kg1/3、0.84m/kg1/3、0.70 m/kg1/3的爆炸荷載作用下,板發(fā)生了整體彎曲破壞,加固板的峰值位移和殘余位移均大幅減小,受力主筋的應變也明顯降低,并沒有發(fā)生加固層整體剝離脫落破壞。(3)通過對比分析試驗結果發(fā)現,加固層中的鋼絲繩間距(短邊×長邊)為30mm×50mm的網片要比鋼絲繩間距(短邊×長邊)為60mm×100mm的網片有更好的抗爆加固效果,使加固層的耗能能力顯著提升,有效地減輕了板在爆炸荷載下的破壞程度。(4)通過試驗結果還可以發(fā)現,對鋼絲繩施加預應力能夠有效降低板的最大位移和板底部受拉鋼筋的最大應變;增加砂漿強度能夠增強鋼絲繩與砂漿之間的粘結能力,使加固層的整體變形能力和剛度增強,但并不是砂漿強度越高越好,會存在剛度不協調的問題;增加銷釘能夠有效防止爆炸荷載作用下加固層與原混凝土板發(fā)生剝離,但對于提高原構件的抗爆性能影響不大。(5)給出了高強鋼絲繩網片-聚合物砂漿加固鋼筋混凝土板的抗爆加固設計建議:1)根據構件的抗爆設計水平,合理選擇鋼絲繩間距提高加固層的耗能能力,以達到減小原鋼筋混凝土板損傷程度的目的。2)建議在RC板的跨中位置設置一些抗剪銷釘,用以增加加固層與原構件的界面承載力,同時應考慮銷釘的增加對原混凝土構件的損傷。3)合理選擇砂漿強度,使加固層和原鋼筋混凝土構件的剛度合理匹配,以達到較好的抗爆加固效果。
[Abstract]:In recent years around the explosion events including dangerous goods warehouse It is often seen., and residential gas pipeline explosion occurred near the residential area encountered in the explosion, including terrorist bombings in crowded public buildings for extremists, resulting in a large number of casualties. With terrorist bombings and accidental explosion increasing problems safety explosion becomes more and more prominent. The reinforced concrete (RC) slab is an important component in the building structure, plays a key role in the anti explosion explosion safety level of the construction of the structure. Therefore, in order to improve the level of anti explosion design of the important buildings, the need for RC plate reinforcement design method. The current. By sticking steel, Baotou Steel, paste FRP reinforcement design method to improve the antiknock performance of the original RC board, but because of the reinforcement method were involved in The use of organic and structural adhesive, which affects its application in high temperature environment. The explosion of high strength steel wire mesh and polymer mortar is a new reinforcement technology, compared with the traditional reinforcement measures, has good fire resistance, corrosion resistance and durability, and has been widely applied in seismic strengthening building structure and bridge, but there is no research on the reinforcement technology in explosion protection field applicability. Therefore, exploring under the explosive load of high strength steel wire mesh and polymer antiknock performance of reinforced concrete slabs reinforced mortar has important significance. This article first through the numerical simulation of blast loading in high strength steel wire mesh and polymer mortar antiknock performance of reinforced concrete slabs, verify the validity of the results in the simulation based on the finite element software ANSYS/LS-DYNA build The finite element model and related test, effect of explosive and the size of single and double reinforcement reinforcement factors, and further analysis of the strength parameters of mortar mortar thickness, wire rope spacing on the reinforcement effect, do the preliminary preparation for the test. After the explosion, the 7 blocks of reinforced concrete plate parameters for the explosion test, comparison and analysis of the test results and the unreinforced plate reinforcement, reinforcement factor test takes into consideration the strength of mortar, steel wire rope spacing, wire rope and prestressed pin and cracks from the failure pattern, component development, stress and strain of steel, displacement and other aspects of the comparison. The main conclusions are as follows: (1) using finite element software LS-DYNA to simulate the dynamic performance of the reinforced concrete slab under explosion load, we proved that the finite element model and the The material properties of rationality and validity, then the parameters were discussed in detail, the simulation results show that the double reinforcement reinforcement effect and the antiknock performance is better than the single reinforcement; and also found that the mortar reinforcement effect of layer thickness and mortar strength of a reinforced concrete slab is obvious. (2) according to the experimental phenomena and the data can be seen, high-strength steel wire mesh and polymer mortar anti explosion effect of reinforced concrete plate is very significant, the extent of damage in the explosion load was reduced. In the distance ratio were 0.94 m/kg1/3,0.84m/kg1/ 3,0.70 m/kg1/3, the whole plate bending failure, strengthening peak displacement and residual displacement of the plate were greatly reduced, strain reinforcement was also decreased, and no reinforcement layer of whole peel off failure. (3) through the comparison and analysis of test results, and Solid layer of wire rope spacing (short side long edge * 30MM * 50mm) as compared to the wire rope spacing (short side long edge * 60MM * 100mm) network has better reinforcement effect, the reinforcement layer energy dissipation capacity significantly improved, effectively reduce the plate under blast load the extent of damage. (4) can also be found from the test results of prestressed steel wire rope can effectively reduce the maximum displacement and the maximum strain at the bottom of the plate plate tensile reinforcement; to increase the strength of mortar can enhance the bonding ability between rope and mortar, the overall deformation ability of reinforcement layer and stiffness enhancement, but not the strength of mortar is good, there will be no stiffness coordination problem; increase the pin can effectively prevent the blast loading reinforcement layer and the original concrete plate debonding, but has little effect to improve the antiknock performance of the original component. (5) presented high strength steel wire Design suggestions of mesh reinforced concrete slabs strengthened with polymer mortar reinforcement: 1) according to the level of anti explosion design components, reasonable selection of wire rope reinforcement layer spacing increased energy dissipation capacity, so as to reduce the damage degree of the original reinforced concrete slab to.2) suggest some shear pins are arranged on the RC board of the cross position with in order to increase the reinforcement layer and the original component interface capacity, should also consider the damage of the original pin.3 concrete) reasonable choice of mortar strength, the reinforcement layer and the original reinforced concrete member stiffness matching, to achieve better reinforcement effect.

【學位授予單位】：北京建筑大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU375.2;TU352.13

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