同縫砌筑的N式砌塊配筋砌體剪力墻的抗震性能試驗(yàn)研究

1、同縫砌筑的N式砌塊配筋砌體剪力墻的抗震性能試驗(yàn)研究【中文摘要】N式砌塊墻體具有孔、肋對(duì)齊的特征,可有效減輕當(dāng)前砌塊建筑中存在的開裂、滲水等工程質(zhì)量題目,應(yīng)用遠(yuǎn)景廣闊,而且N式砌塊砌體由于塊體的改進(jìn),可同縫砌筑,但目前對(duì)同縫砌筑的N式砌塊砌體力學(xué)性能的試驗(yàn)研究基本處于空缺,本文結(jié)合湖南省建設(shè)科技項(xiàng)目研究課題N式砌塊配筋砌體剪力墻抗震性能試驗(yàn)研究,鑒戒以往砌塊砌體的研究成果以及前期進(jìn)行的正常砌筑的N式砌塊砌體的研究成果,對(duì)同縫砌筑的N式砌塊砌體的基本力學(xué)性能以及同縫砌筑的N式砌塊配筋砌體剪力墻的抗震性能進(jìn)行了試驗(yàn)研究與分析。首先闡述了N式砌塊砌體的同縫施工方法,從N式砌塊同縫砌體的塊形及其同縫砌體

2、結(jié)構(gòu)與普通砌塊砌體的不同來進(jìn)行比較分析。通過6個(gè)同縫砌筑的半灌孔N式砌塊砌體抗壓試件的受壓性能試驗(yàn),分析了同縫砌筑的N式砌塊砌體受壓的破壞形態(tài)、開裂荷載、極限承載力及變形能力。試驗(yàn)結(jié)果表明,由于N式砌塊獨(dú)特的截面幾何外形使得N式砌塊砌體的孔、肋具備良好的對(duì)齊率,較好的改善了其受壓性能,與普通混凝土小型砌塊砌體(標(biāo)準(zhǔn)砌塊)相比,其開裂強(qiáng)度、抗壓強(qiáng)度和彈性模量均得到進(jìn)步。對(duì)于灌孔N式砌塊砌體本文給出了半經(jīng)驗(yàn)半理論的抗壓強(qiáng)度計(jì)算公式,公式計(jì)算值與試驗(yàn)結(jié)果吻合良好。基于試驗(yàn)應(yīng)力、應(yīng)變數(shù)據(jù),回回得到了砌塊砌體應(yīng)力應(yīng)變曲線、彈性模量,并給出了相應(yīng)的數(shù)值表達(dá)式。通過3個(gè)同縫砌筑的半灌孔N式砌塊砌體抗剪試件的

3、受剪性能試驗(yàn),了解了N式砌塊砌體的受剪破壞特征。根據(jù)灌孔N式砌塊砌體抗剪試驗(yàn)現(xiàn)象,鑒戒以往砌體的研究成果,在綜合考慮外圍砌塊對(duì)芯柱的有利約束作用等因素的條件下,建立了灌孔N式砌塊砌體的抗剪強(qiáng)度計(jì)算公式,公式計(jì)算值與試驗(yàn)結(jié)果吻合良好。通過兩片同縫砌筑的N式砌塊配筋砌體剪力墻在水平低周往復(fù)荷載作用下的試驗(yàn)研究,對(duì)同縫砌筑的N式砌塊配筋砌體剪力墻的破壞模式、極限承載力、滯回特性、延性等抗震性能指標(biāo)進(jìn)行研究。試驗(yàn)表明同縫砌筑的N式砌塊配筋砌體剪力墻同比于普通混凝土砌塊砌體剪力墻體現(xiàn)出較高的極限承載力,豎向壓應(yīng)力較小時(shí)墻體更輕易發(fā)生延性較好的彎曲破壞。豎向壓應(yīng)力的大小、水平鋼筋數(shù)目、豎向鋼筋數(shù)目是影響墻

4、體極限承載力和破壞模式的三個(gè)最主要因素,在設(shè)計(jì)墻體時(shí)要綜合考慮三者之間的相互關(guān)系盡量滿足強(qiáng)剪弱彎的要求,使得墻體發(fā)生延性較好的彎曲破壞。);【Abstract】 N-block masonry wall is a kind of masonry wall with the feature of fully aligned web-shells. It is recognized that cracking, water seepage and other engineering problems have been effectively mitigated by this kind of m

5、asonry wall, which has broad prospect of application. And this type masonry wall can be built with straight-lint joint. However, experimental study on its mechanical behavior is still limited. With the financial support from the construction technology research project of HuNan Province - Experiment

6、al Research on Seismic behaviors of Reinforced N-block Masonry Shear Wall, and based on previous research achievements on normal block masonry and N-block masonry wall, the basic mechanical performance of N-block masonry prism built with straight-lint joint, the seismic performance of reinforced N-b

7、lock masonry reinforced shear wall built with straight-lint joint has been researched and analyzed.First of all, expatiated the N-type block masonry built with straight-lint joint construction methods, via the N-type block-shaped, and differences comparison between N-type block masonry structure wit

8、h concrete block masonry.Through tests of 6 (6 half-grouted) block masonry specimens built with straight-lint joint on compressive behaviors, failure shape, cracking load, ultimate capacity and deformation capacity of were determined. Test results showed that, comparing with common concrete block ma

9、sonry, due to special sectional geometric shape of N-block, the web-shell of N-block masonry exhibited favorable aligned ratio, the compressive behavior was better improved, and cracking load, compressive strength and elastic modulus of N-block masonry had been enhanced. Based on the compression mec

10、hanism of N-block masonry, a semi-empirical and theoretical formula of compressive strength is presented for grouted N-block masonry. And results calculated by the formulas were in good agreement with the test results. According to the test data of stress and strain, the stress-strain curve and modu

11、lus had been fitted, and the corresponding numerical expressions were also presented.Via the experiments of 3 (3 half-grouted) shear specimens built with straight-lint joint on shear performance, the shear failure characteristics were studied. According to the phenomenon of the shear tests, its shea

12、r failure mechanism was analyzed, based on previous research achievements and under the comprehensive consideration of the favorable restriction effect of external block on the core columns, relevant shear resistant formula of grouted N-block masonry was established, and results calculated by the fo

13、rmulas aligned well with the test results.Through experimental researches of two reinforced N-block masonry shear walls under the lateral cyclic load, the failure parttern, ultimate strength, hysteretic characteristics, and ductility and so on which all were indexes of seismic performance had been p

14、reliminarily investigated. Test results indicated that reinforced N-block masonry shear wall built with straight-lint joint had higher ultimate bearing capacity comparing to ordinary concrete block masonry shear walls, and when axial compressive stress is lower, ductial bending failure is more inclined to happen. The magnitude of vertical compressive stress and the quantity of horizontal steel and the quantity of vertical steel were three main factors which affected the ultimate strength and failure mode of the reinforced N-block masonry shear wall built wit