Experimental Investigation on the Aseismic Behavior of Seismic Damage Masonry Wall Retrofitted with Grouting and Steel Hoops

In order to accurately evaluate the aseismic behavior of the seismic damaged masonry pagodas destroyed by Wenchuan earthquake and strengthened after the earthquake, a test was conducted to acquire related parameters on seismic performance from the specimens made by masonry and retrofitted with grouting and steel hoops. Taking a seismic damaged ancient masonry pagoda in Sichuan as a case study, four kinds of primitive specimens are fabricated by simulating the conformation of the masonry pagoda. Then the primitive specimens are destroyed under cycle loads and the damaged specimens are repaired by grouting and steel hoops. Cycle controlling tests are conducted with the specimens and relevant data are acquired. Experimental results showed that grouting combined with steel hoops could improve the ductility and energy dissipation capacity of a seismic damage of brick masonry structure, but it do a little to improve the stiffness of a seismic damage structure. And the cracking load of the repaired masonry is much lower than the original undamaged structure.     

N式砌块砌体受剪性能试验研究

对30个N式砌块砌体抗剪试件(其中未灌孔试件6个,灌孔试件24个)进行了受剪力学性能试验研究,了解了N式砌块砌体的破坏形态及破坏机理.试验结果表明,灌孔N式砌块砌体的受剪开裂荷载与极限荷载的比值随灌孔率的不同分别为:半灌孔试件77%~82%、全灌孔试件54%~59%.随着灌孔混凝土面积的增大,N式砌块砌体表现出越来越好的延性.未灌孔N式砌块砌体的抗剪强度平均值比砌体规范抗剪平均强度公式计算值高出11%,半灌孔N式砌块砌体的抗剪强度平均值比砌体规范平均强度计算值高出5%,全灌孔N式砌块砌体的抗剪强度平均值比砌体规范平均强度计算值高出74%~106%.     

机制生态改性生土坯砖砌体基本力学性能试验

针对生土坯砖砌体房屋抗震性能差、材料强度较低等特点,对选用水玻璃、钾明矾、尿素、可再分散性乳胶粉、秸秆等无污染材料进行复合改性的机制生态改性生土坯砖砌体的基本力学性能进行了研究。对4组共30个机制生土坯砖砌体试件进行了抗压和抗剪强度试验,分析了机制生土坯砖砌体的破坏形态,探究了机制生土坯砖砌体的抗压本构关系,修正了适用于机制生态改性生土坯砖砌体的平均抗压强度取值公式。结果表明:与机制未改性生土坯砖砌体相比,机制生态改性生土坯砖砌体的抗压强度、抗剪强度和延性分别提高了23%,17%和7%;机制生土坯砖砌体的应力-应变曲线与杨卫忠砌体本构方程拟合度较高;当砌体块体类别为机制生土坯砖时,与块体类别有关的参数k_1分别取值0.42和0.46,此时该研究提出的砌体抗压强度计算公式适用于机制未改性生土坯砖砌体和机制生态改性生土坯砖砌体。     

底层框架抗震墙砖房的抗震设计

文章对底层框架抗震墙砖房的抗震设计进行了论述。     

水平灰缝网状配筋砖砌体受复合作用时的抗剪强度

本文基于对34个受复合作用试件的试验结果的理论分析,为水平灰缝网状配筋砖砌体的抗剪强度提出了一个有限元计算方法和一个实用计算方法     

农村住宅建筑墙体裂缝产生原因和防治措施

农村住宅普遍存在建筑墙体裂缝问题，严重影响居民安全。本文对其产生的原因进行分析，并提出了具体的防治措施，为保证农村建筑安全提供有益参考。     

A Study on the Response of Brick Masonry Structure under Dynamic and Static Shear-Compression Loading and Suggested Shearing Equation

Based on the studies and experiments of the responses of brick model under dynamic and static shear-compression loading, this paper brought forward an equation as a transition one for standard of masonry structure design in revision and the standard of aseismic building design. With its simple form, definite concept and similar calculation results in comparison with those obtained by equations from two standards, this equation has realized the correlation of the old and new ones. Besides it is rather save, so it has given a new advice for the revision of the standards.     

砌体裂缝的原因及处理方法

简述了砌体出现裂缝的原因，并分析其原因提出了预防措施。     

Seismic Shear Strength of Concrete Hollow Block Masonry

According to some problems existed in current Chinese codes for design of seismic shear strength of concrete hollow block masonry, the curve of shear strength of concrete hollow block masonry under shear-compression loading, including descent segment, was presented by theory of failure region and test results of 58 concrete block masonry walls under shear-compression loading. And the design seismic shear strength formula of concrete hollow block masonry, which has reliability guarantee, was deduced. Compared with current Chinese codes, the design seismic shear strength formula of concrete hollow block masonry not only can perfectly simulate the shear-friction, shear-compression and diagonal compression failure modes, but also avoid unreasonable and unsafe calculation of seismic shear strength of concrete hollow block masonry, which can be applied to design of tall reinforced concrete masonry structures.     

对承重窗间墙过梁下砌体的局压承载力计算的探讨

根据混合结构承重窗间墙窗过梁下的局压砌体的内拱效应、局压强度、受荷面积不同于一般楼盖梁端局压砌体的特点 ,对其承载力计算公式提出探讨并作修正 ,较好地反映实际情况 ,同时需作进一步试验和研究