填充棉秆-EPS砌块村镇住宅复合墙体受力机理研究

Focusing on the problem for relatively high costs and poor housing insulation properties in anti-seismic and comfortable housing project in Xinjiang, a new type of the composite wall filling cotton straw- EPS block isputforward, which based onthe applicant‘s development about the cotton straw - EPS blockusingof local rich cotton stalk resourcesin the early stage.The wall is constituted by frame column , dark beam, smaller cross section rib column and block between rib column.Rachel reinforcement is located in the masonry every certain height set for reinforcing rib column and frame column surrounding column. The system is conducive to improving the safety and comfort of the agricultural and pastoral housing, butthe stress of the wall system and the seismic mechanism has not been studied.The project intends to use the method of experiment, numerical simulation and theoretical analysis, to determine single axis and elastoplastic constitutive relation of building block material,to analysis the failure mode and bearing capacity of the composite wall under vertical load, to reveal the cooperative working mechanism of each component, and to uncover influence of different factors on the failure characteristics and seismic performance of composite wall under earthquake. The mechanical behavior and seismic behavior of the complex load are revealed, and the design control index and construction measures of composite wall are put forward. Theoretical and technical would be provide supporting for improving the security and comfort of agricultural and pastoral housing in Xinjiang.

针对新疆“抗震安居”工程中出现建房成本较高、房屋保温性能较差等问题，利用当地富产的棉花秸秆资源，申请人在前期研发了水泥基棉秆—EPS砌块，并提出了填充棉秆—EPS砌块复合墙体体系—密肋柱复合墙体，该墙体由外框架（由外框柱及暗梁构成）和填充墙体（由肋柱及肋柱之间填充的棉秆—EPS砌块构成，并在砌筑墙体时每隔一定的高度设置拉结筋与肋柱（或框柱）拉结）。该体系有利于提高农牧民住宅的安全性和舒适性，但该墙体体系的受力及抗震机还理缺乏探究。本项目拟采用试验、数值模拟及理论分析相结合的方法，确定砌块材料的单轴及弹塑性本构关系，分析在竖向荷载作用下复合墙体破坏模式、承载力，揭示各构件协同工作机理；分析地震作用下不同因素对复合墙体破坏特征及抗震性能的影响，揭示其在复杂荷载下的受力机理及抗震性能，提出复合墙体构件设计控制指标及构造措施策略，为提高新疆农牧民住宅的安全性和舒适性提供理论及技术支持。

项目利用当地农作物废弃物棉秆纤维以及EPS颗粒(聚苯乙烯泡沫)，以水泥砂浆为胶结材料而制作一种新型墙体材料—棉秆-EPS砌块。在研究中试验研究了棉秆形态变化对棉秆-EPS砌块物理力学性能影响，得出最优的棉秆纤维形态，探究不同棉秆和EPS掺量下的砌块各项物理力学性能，以及该种砌块龄期-抗压强度规律，研究棉秆-EPS砌块单轴受压下的本构方程，探讨棉秆形态变化和EPS粒径大小对棉秆-EPS砌块以及其砌块砌体的物理力学性能影响，并将该种墙体材料应用于由一种肋柱、边框柱以及暗梁而构造组成的新型生态复合墙体结构体系中，通过室内试验研究在竖向荷载和水平荷载共同作用下，分析不同墙体构造形式和轴压比下墙体的抗震性能。