本文選題：鋼絲繩網(wǎng)片 + 聚合物砂漿��； 參考：《北京建筑大學(xué)》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(nèi)遇到的燃?xì)夤艿辣白≌浇l(fā)生的危險(xiǎn)品倉庫爆炸,也包括極端分子對人群密集的公共建筑進(jìn)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(hù)問題也顯得越來越突出。鋼筋混凝土(RC)板作為建筑結(jié)構(gòu)中重要的受力構(gòu)件,其抗爆炸沖擊水平對整個(gè)建筑結(jié)構(gòu)的爆炸安全具有關(guān)鍵作用。因此,為了提高重要建筑結(jié)構(gòu)的抗爆設(shè)計(jì)水平,需要對RC板進(jìn)行抗爆加固設(shè)計(jì)。當(dāng)前,可以通過粘鋼、包鋼、粘貼FRP等加固設(shè)計(jì)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(jī)結(jié)構(gòu)膠的使用,影響其在爆炸產(chǎn)生的高溫環(huán)境中的應(yīng)用。高強(qiáng)鋼絲繩網(wǎng)片-聚合物砂漿加固技術(shù)是一種新型的加固技術(shù),與傳統(tǒng)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(jīng)在建筑結(jié)構(gòu)與橋梁抗震加固中得到廣泛應(yīng)用,但對于該項(xiàng)加固技術(shù)在抗爆防護(hù)領(lǐng)域的適用性沒有相關(guān)研究。因此,探究在爆炸荷載作用下高強(qiáng)鋼絲繩網(wǎng)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(shù)值模擬的方式探究了在爆炸荷載作用下高強(qiáng)鋼絲繩網(wǎng)片-聚合物砂漿加固鋼筋混凝土板的抗爆性能,在驗(yàn)證模擬結(jié)果有效性的基礎(chǔ)上,運(yùn)用有限元軟件ANSYS/LS-DYNA建立了與試驗(yàn)相關(guān)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(shí)進(jìn)一步分析了加固參數(shù)砂漿強(qiáng)度、砂漿厚度、鋼絲繩間距對加固效果的影響,為爆炸試驗(yàn)做好前期準(zhǔn)備。之后,對7塊不同加固參數(shù)下鋼筋混凝土板進(jìn)行了爆炸試驗(yàn),對比分析了加固板與未加固板的試驗(yàn)結(jié)果,試驗(yàn)考慮的加固因素有砂漿強(qiáng)度、鋼絲繩間距、鋼絲繩預(yù)應(yīng)力和銷釘,并從構(gòu)件的破壞形態(tài)、裂縫發(fā)展、鋼筋的應(yīng)力應(yīng)變、位移時(shí)程曲線等方面進(jìn)行了比較。論文主要研究結(jié)論如下:(1)應(yīng)用有限元軟件LS-DYNA數(shù)值模擬了鋼筋混凝土板在爆炸荷載作用下的動(dòng)態(tài)性能,首先驗(yàn)證了所建有限元模型及所選用材料性質(zhì)的合理性和有效性,然后對各項(xiàng)參數(shù)進(jìn)行了詳細(xì)地分析比較,模擬結(jié)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(xiàn)砂漿加固層厚度和砂漿強(qiáng)度對鋼筋混凝土板的加固效果影響比較顯著。(2)根據(jù)試驗(yàn)現(xiàn)象和數(shù)據(jù)可以看出,高強(qiáng)鋼絲繩網(wǎng)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(yīng)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(yàn)結(jié)果發(fā)現(xiàn),加固層中的鋼絲繩間距(短邊×長邊)為30mm×50mm的網(wǎng)片要比鋼絲繩間距(短邊×長邊)為60mm×100mm的網(wǎng)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(yàn)結(jié)果還可以發(fā)現(xiàn),對鋼絲繩施加預(yù)應(yīng)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(yīng)變;增加砂漿強(qiáng)度能夠增強(qiáng)鋼絲繩與砂漿之間的粘結(jié)能力,使加固層的整體變形能力和剛度增強(qiáng),但并不是砂漿強(qiáng)度越高越好,會存在剛度不協(xié)調(diào)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(gòu)件的抗爆性能影響不大。(5)給出了高強(qiáng)鋼絲繩網(wǎng)片-聚合物砂漿加固鋼筋混凝土板的抗爆加固設(shè)計(jì)建議:1)根據(jù)構(gòu)件的抗爆設(shè)計(jì)水平,合理選擇鋼絲繩間距提高加固層的耗能能力,以達(dá)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(shè)置一些抗剪銷釘,用以增加加固層與原構(gòu)件的界面承載力,同時(shí)應(yīng)考慮銷釘?shù)脑黾訉υ炷翗?gòu)件的損傷。3)合理選擇砂漿強(qiáng)度,使加固層和原鋼筋混凝土構(gòu)件的剛度合理匹配,以達(dá)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(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU375.2;TU352.13

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